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LX-HOO
TECHNICAL MANUAL
-- .--

EPSON

EPSON is a registered trademark of SEIKO EPSON CORPORATION. IBM is a registered trademark of International Business Machines Corporation.

NOTICE ` All rights reserved. Reproduction of any part of this manual in any form
whatsoever without SEIKO EPSON's express, written permission is forbidden. The contents of this manual are subject to change without notice. q All efforts have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. q The above notwithstanding, SEIKO EPSON can assume no responsibility for any errors in this manual or their consequences.
q

@ Copyright 1987 by SEIKO EPSON CORPORATION Nagano, Japan

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REV.-A

PRECAUTIONS
Precautionary notations throughout the text are categorized relative to: 1 ) personal injury, and 2) damage to equipment. DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by DANGER headings. WARNING Signals a precaution which, if ignored, could result in damage to equipment.

The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.

DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE. 2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK. 3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON-CERTlFIED REPAIR TECHNICIAN. 2. MAKE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM THE AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE. 3. ALWAYS VERIFY THATTHE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS. 4. IN ORDER TO PROTECT SENSITIVE /.LP CHIPS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS. 5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS RECOMMENDED BY THE MANUFACTURER; INTRODUCTION OF SECOND-SOURCE ICS OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.

- ii -

REV.-A

PREFACE
This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the LX-800. The instructions and procedures included in this document are intended for the experienced repair technician, who should pay attention to the precautions on the preceding page. The chapters are organized as follows: Chapter 1 -- -- Chapter 2 -- Chapter 3 -- Chapter 4 -- Describes the theory of printer operation Discusses the options Includes a step-by-step guide for product disassembly, assembly, and adjustment Chapter 5 -- Chapter 6 -- Provides Epson-approved techniques for troubleshooting Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment Provides a general product overview, lists specifications, and illustrates the main components of the printer

q

The contents of this manual are subject to change without notice.

- iv -

REVISION SHEET
IREVISION I DATE ISSUED CHANGE DOCUMENT 1st issue 1-1, 5, 8, 12 through 18 2-2,11, 13,28,30,38 through 42 4-1, 13, 17, 19 5-1, 2, 6 6-1 A-2, 17, 18

-v-

REV.-A

TABLE OF CONTENTS
CHAPTER 1. CHAPTER 2. CHAPTER 3. CHAPTER 4. CHAPTER 5. CHAPTER 6. APPENDIX GENERAL DESCRIPTION OPERATING PRINCIPLES OPTIONAL EQUIPMENT DISASSEMBLY, ASSEMBLY, AND ADJUSTMENT TROUBLESHOOTING MAINTENANCE

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REV.-A

CHAPTER 1 GENERAL DESCRIPTION
... 1.1 FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 ... 1.2 INTERFACE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 .. 1.3 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 . 1.4 OPERATING CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12 1.4.1 Dip Switch and Jumper Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-12 1.4.2 Control Panel (and Auto Sheet Load Function) . . . . . . . . . . . . . . . . 1-14 1.4.3 Self Test and Hexadecimal Dump Functions . . . . . . . . . . . . . . . . . . . . 1-15 --. -- .. 1.4.4 SeiecType Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .--.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16 1.4.5 Buzzer and Error Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-17 1.4.6 Printer Initialization and Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17 1.5 MAIN COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18 1.5.1 Printer Mechanism Model-3A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-18 . 1.5.2 ROC Filter Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-19 . 1.5.3 ROCX Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-20 . 1.5.4 LCPNL Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-20 .. 1.5.5 Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-21

LIST OF FIGURES
Fig. 1-1. Fig. 1-2. Fig. 1-3. Fig. 1-4. Fig. 1-5. Fig. 1-6. Fig. 1-7. Fig. 1-8. Fig. 1-9. . Exterior View of LX-800 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Exterior View of LX-800 with Tractor Unit. . . . . . . . . . . . . . . . . . . . . . . 1-2 Data Transmission Timing of 8-Bit Parallel Interface.... 1-3 57-30360 36-Pin Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3 Printhead Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-6 Printable Area for Cut Sheet Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 Printable Area for Roll Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-9 Printable Area for Fan Fold Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1o .. Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

. Fig. 1-10. SelecType Flow Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -16 Fig. 1-11. Mode13Al O Printer Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-18

l-i

REV.-A Fig. 1-12. ROC Filter Unit (120V Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19 Fig. 1-13. ROC Filter Unit (220V/240V Versions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 . Fig. 1-14. ROCX Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 . Fig. 1-15. LCPNL Board Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20 .. Fig. 1-16. Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-21

LIST OF TABLES
. Table 1-1. LX-800 Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2 Table 1-2. Connector Pin Assignments and Signal Functions . . . . . . . . 1-4 Table 1-3. Printer Select/Deselect (DC1/DC3) Control . . . . . . . . . . . . . . . . . . . . . 1-5 Table 1-4. Printer Speed, Character Size, and Column Width . . . . . . . . 1-7 . Table 1-5. Type of Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-8 . Table 1-6. DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -12 Table 1-7. International Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-13 Table 1-8. DIP Switches Factory Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13 . Table 1-9. Jumper Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-13

Iii

REV.-B

1.1

FEATURES

The LX-800 is a multifunctional and high speed serial dot impact printer with a compact body and the

low price. Features include: q 180 cps maximum speed (draft-elite), 150 cps (draft-pica) q Upward compatibility with the LX-86 q Built in two NLQ fonts (Roman and Saris-serif) q Direct selection of NLQ/Draft modes, and easy selection of 4 typestyle modes with SelecType controls q Built in IBM graphics characters q Super/Subscript, Italics, and Elite modes can be supported in NLQ q Automatic sheet loading function q A 3K-byte input buffer for improved throughput from the host computer q Pull tractor feeding q Optional interface for the EPSON #81 XX series Tw=models of the LX-800 are manufactured. The model for t~e U.S and Australia uses printer cover A and the model for all countries except the U.S. and Australia uses printer cover B. Figures 1-1 and 1-2 show the external view of the LX-800. Table 1-1 lists the options.

(Printer cover A) Fig. 1-1. Exterior View of LX-800

(Printer cover B)

1-1

REV.-A

(Printer Cover A)

(Printer Cover B)

Fig. 1-2. Exterior View of LX-800 with Tractor Unit

Table 1-1. LX-800 Options I Option No. I Description Roll Paper Holder APPLE II Intelligent Interface New Serial Interface RS-232C/Current Loop Type 2 InterFace Intelligent Serial Interface Intelligent IEEE-488 Interface

#83 1 0 #81 33 #8 143 #8 145 #81 48 #8 165

1-2

REV.-A

1.2 INTERFACE
The LX-800 has a 8-bit parallel interface as a standard. The specifications for the 8-bit parallel interface

are as follows: Data Format: Synchronization: Hand Shaking: Logic Level: Data transmission timing: Connector:
BUSY ACKNLG OATA STROBE

8-bit parallel By STROBE pulse By both ACKNLG and BUSY, or either of them ITL (LS type) compatible See Figure 1-3. 57-30360 (AMPHENOL) or equivalent (See Figure 1-4.)

0.5JAS
min.

1= 0.5JAS
min.

O..sus
min.

"w
19. GNO ( 20. GNO (
Pair with 1.) Pair w;tn2.)

NOTE: Transmission time (rising and falling time) of every input signal must be less than 0.2Ks. Fig. 1-3. Data Transmission Timing for 8-Bit Parallel Interface

1.

2.
3. 4. 5. 6. 7.

Z 1. GNO ( Pair w;th3.) 22. GNO ( Pair wnh4.)

23. GNO (

Pair w;tn5.)

24. GNO ( Pair w;th6.) 25. GNO ( Pair witn7.) 2 6 . GNO ( Pair w;th S . ) 27. GNO ( P a i r w;tn9.) 2S. GNO ( Pair w:th 1 0 . ) 2 9 . GND ( Pair with 11. ) 3 0 . GNO ( Pair witn 1 2 . ) 31. m 32. m 3 3 . GNO 34. NC 3 5 . +5V 36. m

e.
9. 10 11 12 13 14 15 16 17 18

Fig.1-4. 57-30360 36-Pin Connector

1-3

REV.-A Table 1-2 shows the connector pin assignments and signal functions of the 8-bit parallel interface. Table 1-2. Connector Pin Assignments and Signal Functions ~in No. 1 Signal Name STROBE Return Pin No. 19 DIR In Functional Description Strobe pulse to read the input data. Pulse width must be more than 0.51Js. Input data is latched after
falling edge of this signal. 2 3 4 5 6 7 8 9 DATA 1 DATA2 DATA3 DATA4 DATA5 DATA6 DATA7 DATA8 ACKNLG Parallel input data to the printer. "HIGH" level means data " 1". "LOW" level means data "O".

20
21 22 23 24 25 26 27 28

In

In In In In In In In

10

out

This pulse indicates data are received and the printer is ready to accept next data. Pulse width is approx. 12 KS. HIGH indicates printer can not accept next data.

11 12

BUSY PE

29

out
out

30 --
--

HIGH indicates paper-out. This signal is effective only when ERROR signal is "LOW".
Always

13
14

SLCT
AUTOFEED-XT

out

"HIGH" output. (Pulled up to +5V through 3.3 K ohms register.)

In

If the signal is "LOW" when the printer is initialized, a line feed is automatically performed by input of "CR" code. (Auto LF) Not used. Ground for twisted-pair grounding. Chassis ground level of printer Not used. Ground for twisted-pair grounding. Pulse (width: 50MS min., active "LOW") input for printer initialization. LOW indicates that some error has occurred in the printer. Ground for twisted-pair grounding Not used. Always "HIGH". (Pulled up to +5V through a 3.3k-ohm register.) If the signal is "LOW" when printer is initialized, the DC l/DC3 control is disabled.

15 16 17 18 9 to 30 31 32 33 34 35 36

-- GND Chassis GND --

-- -- -- --

-- -- -- --

GND
I NIT ERROR GND -- --

--
16 -- -- -- -- --

--
In

out
. --

out
In

SLCT-IN

1-4

REV.-B NOTES 1. "Return" denotes a twisted pair return line connected to signal ground. When interfacing the printer to the host, use twisted pairs for each signal. Shield the twisted pairs, and connect the shield to GND in order to reduce interface. 2. All interface conditions are based on TTL levels. Both the rise and fall times of all signals must be less than 0.2Ks. 3. Refer to the Parallel Interface Timing Chart for the timing of the signals. 4. Data transfer protocol must not ignore the ACKNLG or BUSY signal. (Data can be transferred either after recognizing the ACKNLG signal or when the BUSY signal is LOW.) 5. The AUTO FEED XT and SLCT IN signals are valid when they are not fixed to LOW level by the DIP switch or jumper. 6. Printing tests, including those of the interface circuits, can be performed without using external equipment: set interface connector data lines 1-8 to the desired code (a floating signal will be a logical 1, and a grounded signal will be a O) connect the ACKNLG signal to the STROBE signal. 7. The PE signal is valid when the ERROR signal is LOW. -- SLCT IN Signal State at Initialization Table 1-3. Printer Select/Deselect (DC--1/DC3) Control Dcl/Dc3 Printer Select/Deselect Data entry
I Enable Enable (Waits for a DC1. Input data is ignored until a DC 1 code is received.) Enable Enable

I
HIGH LOW

DC 1 DC3 DC1 DC3

I

Select Deselect Select Select

1-5

REV.-A

1.3 SPECIFICATIONS
This chapter describes the specifications of the LX-800 printer. q General Specifications Serial impact dot matrix Printing method: Pin configuration: Pin diameter: Dot Pinch: 9 wires (see Figure 1-5) 0.29 mm 0.35 mm (1/72 inch)

#1 #2 #3

() ()

i 0.29mm
t 0.35mm (1 /72") t

# 4 <> #5 #6 #7 #8 #9 ( )

Fig. 1-5. Printhead Pin Configuration Printing direction: Text mode: Bit-image mode: Dot matrix: Bi-directional with logic seeking Uni-directional (left to right) 9 X 9 (Draft) 11 X 18 (NQL) 6 X 8 (Graphics) Character sets: 96 ASCII characters 96 Italic characters 32 International characters 32 International Italic characters 32 Graphics characters 96 IBM Graphics characters Fonts: Printing speed: Character size: Column width: Draft, NLQ-Roman, Saris-serif See Table 1-4 See Table 1-4 See Table 1-4 480 dots/line at 60 dots/inch (Bit-image)

1-6

--.--

REV.-A Table 1-4. Printing Speed, Character Size, and Column Width

Charecter Size (mm) Column Width Pitch (meximum Type Style (maximum Chara- Characters Font Normal Double Empha- Con- Printing Speed (CPS) Width Height cters/LinsCPL) /inch-CPl)
Width -- o -- . 0 -- -- 0 Draft (Elite) o -- -- NLQ Supersubscript ...-- o 0 -- o -- -- -- sized densed -- -- 0 0 -- -- -- -- -- -- -- -- -- -- -- o o -- -- o -- -- Draft (Pica) 0 150 75 75 37 128 64 180 90 150 25 1.6 2.1 4.2 2.1 4.2 1.05 2.1 2.1 4.2 1.05 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 3.1 80 40 80 40 132 66 96 48 160 10 5 10 5 17 8.5 12 6 20

Line spacing: Line feed speed: (1 line = 1/6") Paper feed method: Paper path: q Paper Specifications Type of paper:

1/6" or Programmable (n/2 16") Approx. 95ms/line (Line feed) Approx. 75ms/line (Form feed) Friction feed or Tractor feed From rear of printer

See Table 1-5

1-7

REV.-B Table 1-5. Type of Paper

Cut sheet Size (Width) 182 mm to 216 mm 7. 15" to 8.5" (Length) Max. 305 mm Max. 12" Thickness Copies Weight 52g/m2 to 82g/m2 0.06 mm to 0.1 mm

Fan-fold paper (Width) 101 mm to 254 mm 4" to 10" (Width)

Roll paper

216 & 3 mm 8.5" & 0.12" (Diameter of roll) Max. 127 mm Max. 5"

Max. 0.25 mm 1 original +2 (1 sheet) 52g/m2 to 82g/m2 (2 sheets) 35g/m2 to 58g/m2 (3 sheets) 35g/m2 to 58g/m2 for 2 sheets + 35g/m2 to 47g/m2 for 1 sheet

0.07 mm to 0.09 mm

52g/m2 to 64g/m2

Feeding method Precautions

Friction feed 1. Do not use continuous form or copy paper. 2. Dismount the Tractor unit.

Tractor feed 1. Release the friction mechanism using the release lever. 2. Use the pressure sensitive paper for copying. Be sure that perforations have a smooth finsh.

Friction feed 1. Use the Roll paper holder. 2. Dismount the Tractor unit.

1-8

REV.-A Printable area: See Figures 1-6 through 1-8

7.1 5" - 8.50/182 mm - 216 mm 0.1 2", 3 g or more 0.87", : T or n m 1 7 F r i n t a 1 2"", b 305 mm t e mm Printable area I
I

I-

0.1 2", 3 mm =more

I

T

ABC

XYZ T

--

a r e a

.--

L

L
ABC lm

XYZ J

, 1 .2'.3 ( or mor

Fig. 1-6. Printable Area for Cut Sheet Paper
8.5", 216 mm

q

0.1 2"/3 mm� or more

Printable area

0.1 2"/3 mm `or more

0.98"/25 mm or more !

ABC

XYZ

Fig. 1-7. Printable Area for Roll Paper
1-9

REV.-A

4" - 10 "/101 mm - 254 mm L Printable area R

7
o

0 0
Printable area
0

0 0 0
0

0 0 0
0 o

/ 0.35 "/9 mm or more 4 0.35 "/9 mm or more

o 0 0 0 - - - - - - - - - - - - - - - -- - - - - -- - - 0 0 0 0 0 0

1T

ABC

XYZ

1:

0 0

o ABC
i Printabh area

o 0 0 0 0 0 0

XYZ : 7 0
0 0 0 0 0 0

L: 0.75"/19 mm [PaDer width is less than 9.5"/241 mm) 1.02")26 mm ~Paper width is more than 9.5 "/241 mm) R: 0.75"/19 mm (Paper width is less than 9.5 "/241 mm) 0.94"/24 mm (Paper width is more than 9.5 "/241 mm)

Fig. 1-8. Printable Area for Fan Fold Paper Ribbon Cartridge Cartridge number: Color: Life: #8750 Black 3 million characters (14 dots/character)

Electrical Specifications 120VAC + 10% Power Voltage: 220/240VAC * 1 0 % Frequency range: 59.5Hz to 60.5Hz (120VAC) 49.5Hz to 60.5Hz (220/240VAC)

Power consumption: Max. 70VA Insulating resistance: More than 10M ohms (between the AC line and chassis) Dielectric strength: 1 KVAC rms/minute or 1.2KVAC rms/second between AC line and chassis (120V) 1.25 kVAC rms/minute or 1.5 kVAC rms/second between AC line and chassis (220/240V)

1-1o

REV.-A q Environmental Specifications Temperature: Humidity: Resistance to shock: Resistance to vibration: �30"C to 60 "C/�22�F to 149�F (Storage) 5�C to 35"C/4 1"F to 95�F (Operating) 5% to 85%RH, no condensation (Storage) 10% to 80%RH, no condensation (Operating) 2G, 1 ms (Storage) IG, 1 ms (Operating) 0.50G, max. 55Hz (Storage) 0.25G, max 55Hz (Operating) q Reliability MCBF: MTBF: Life of printhead: q Safety Approvals . safety Standards: UL 478 (U. S.A.) VDE 0806 (West Germany) RFI: FCC class B (U. S.A.) VDE 0871 (West Germany) q Physical Dimensions: (Refer to Figure A-19) 91 mm (height) 377 mm (width) 399 mm (width including paper feed knob) 308 mm (depth) Weight: 5.1 kg -- CSA 22.2 No. 0.154 (Canada) 3 million lines (Printer mechanism except the printhead) 4000 hours 200 million strokes/needle

1-11

REV.-B

1.4 OPERATING CONTROLS
This section describes the operating controls of LX-800 printer. 1.4.1 DIP Switch and Jumper Settings The DIP switches that users can set are SW1 and SW2. These switches are positioned at the rear center of the printer and have the functions shown in Tables 1-6 through 1-8. (Note: the switches is read only when at power on or at input of the INIT signal). Table 1-6. DIP Switch Settings DIP SW 1-1 1-2 1-3 Typeface select ZERO font select Character Table select Function ON Condensed 0 OFF Normal 0

status of the DIP

I
I I

Graphic Valid NLQ

I
I I

Italic invalid Draft

1-4 I Paper-out detection 1-5 I Printing quality select 1-6 1-7 1-8 2-1 2-2 2-3 2-4 Page length select Cut sheet feeder mode 1" skip over perforation AUTO FEED XT control International character set select

See Table 1-7

12" Valid Valid Fix to LOW

1 1" Invalid Invalid Depends on external signal

1-12

REV.-B Table 1-7. International Character Set ?Country U.S.A. FRANCE GERMANY U.K. DENMARK SWEDEN ITALY SPAIN SW 1-6 ON ON ON ON OFF Sw 1-7 ON ON OFF OFF ON SW 1-8 ON OFF ON OFF ON

I

OFF OFF OFF

I

ON OFF OFF

I

OFF ON OFF

I

Table 1-8. DIP Switches Factory Settings DIP SW No. 1-1 Country U. S.A., Southeast Asia, Middle and Near East Germany, Northern Europe U. K., Australia France, Italy, Spain OFF OFF OFF OFF OFF ON OFF OFF OFF OFF ON ON OFF ON OFF ON OFF OFF OFF OFF OFF
OFF

1-2

1-3

1-4

1-5

1-6

1-7

1-8

2-1

2-2

2-3

2-4

OFF OFF

OFF OFF

OFF OFF

OFF OFF

OFF OFF

ON ON

ON OFF

ON ON

OFF ON

OFF OFF

OFF

OFF

OFF

OFF

OFF
OFF

Jumper J 1 on the ROCX board has the function and factory setting shown in Table 1-9. Table 1-9. Jumper Setting Jumper J1 Function SLCT IN control Open Depends on external signal Close Fix to LOW Factory setting Open

1-13

REV.-B 1.4.2 Control Panel (and Auto Sheet Load Function) Figure 1-9 shows the control panel of LX-800 printer.

a
b c

d e

f

9

Fig. 1-9. Control Panel The functions of the LEDs and switches are: a. POWER LED (green) Lights when the power switch is turned on and AC power is applied. b. READY LED (green) Lights when the printer is ready to receive data. c. PAPER OUT LED (red) Lights when the printer runs out of paper. d. ON LINE LED (green) Lights when the printer is ON-LINE. e. ON/OFF LINE Switch (non-locking push switch) Switches between the ON-LINE and OFF-LINE modes. The printer is automatically set ON-LINE and becomes ready when power is turned on. If the printer is set OFF-LINE, printing is stopped and the printer enters the busy state. f, NLQ/FORM FEED Switch (non-locking push switch) q When this switch is pressed once in the OFF-LINE mode, the paper is advanced vertically to the top of form on the next page. q When this switch is pressed in the ON-LINE mode, the NLQ-Roman or NLQ-Sans-serif fonts are selected, and the buzzer sounds to inform the user which font is selected. Two beeps NLQ-Roman: NLQ-Sans-serif: Three beeps

1-14

REV.-B g. DRAFT/LINE FEED and AUTO LOAD Switch (non-locking push switch) q When this switch is pressed once in the OFF-LINE mode, the paper is advanced vertically one line, and the paper advanced continuously while this switch is pressed. q When this switch is pressed in the ON-LINE mode, the Draft font is selected, and beeps once a buzzer to inform the Draft font is selected. q Cut sheets are automatically loaded when the paper is placed at the sheet guide, printer is paper out, OFF-LINE state and the this switch is pressed.

1.4.3 Self Test and Hexadecimal Dump Functions The conditions of LX-800 may be checked via the self test functions. The self test checked: q Circuit q Printer mechanism q Printing quality q ROM (firmware) code number The code number of ROM is printed on the first line of the self test. To start the self test in either the Draft mode or NLQ mode,+urn the power on while pressing the DRAFT/LINE FEED or NLQ/FORM FEED switch, respectively. In the NLQ self test mode, both Roman font and Saris-serif font are printed every other line. When the DIP switch 1-5 set to on (NLQ mode), only NLQ mode self test is performed, no related switches. To stop the self test, turn the power off by power switch. The conditions of data transmission between LX-800 and the host computer may be checkedvia the hexadecimal dump functions. To set the hexadecimal dump mode, turn the power while pressing the both LINE FEED and FORM FEED switches. Then the message "Data Dump Mode" is printed. The printer prints 16 hexadecimal values, followed by the corresponding ASCII characters. If there is no corresponding printable characters for a value (e.g. a control code), a period (.) is printed. One line is printed for each set of 16 values received, and any remaining data (less than 16 values) can be printed by pushing the ON/OFF LINE switch. To cancel the hexadecimal dump mode, turn the power off by power switch.

1-15

REV.-B 1.4.4 SelecType Function SelecType is a feature of the LX-800 which permits type style programming via the control panel switches without software assistance. In the SelecType mode, following 4 type styles can be selected: q Emphasized q Double-strike q Condensed q Elite Figure 1-10 shows the operation flow chart of SelecType function:

< ENTER > Hold down ON/OFF LINE SW, and press NLQ/FORM FEED SW. (Printer beeps once and ON-LINE LED starts blinking.)

I
1

< Select the type style >
Press ON\OFF LINE SW the number of times indicated below for the mode. (Pay attention to the number of beeps the printer makes when the buzzer sounds.) Emphasized 3 I 4 I
I <

I

Condensed Elite I

I 2 I Double-striked

Set type style >

Press FORM FEED SW.
N ]Y

< EXIT >

I

Press LINE FEED SW.

I

I

I

OFF-LINE

I

Fig. 1-10. SelecType Flow Chart

1-16

REV.-B

1.4.5 Buzzer and Error Functions The buzzer rings under the following circumstances: q When a BEL code is sent to the printer, the buzzer rings once (for 0.1 sec.). q When the NLQ Roman font is set using the FORM FEED switch, the buzzer rings twice (for 0.1 sec. each, with 0.1 sec. pause between rings). q When the NLQ Saris serif font is set using the NLQ/FORM FEED switch, the buzzer rings three times (for O. 1 sec. each, with O. 1 sec. pause between rings). q When the Draft font is set using the DRAFT/LINE FEED switch, the buzzer rings once (for O. 1 sec.). q When the printer enters the SelecType mode, the buzzer rings once (for O. 1 sec.). q When paper out is detected, the buzzer rings eight times (for 0.5 sec. each, with 0.5 sec. pause between rings). q When abnormal carriage operation is detected (hardware error), the buzzer rings five times (for 0.5 sec. each, with 0.5 sec. pause between rings). q -W--hen abnormal voltage is detected (hardware error), the buzzer .-- rings five times (for 0.5 sec. each, with 0.5 sec. pause between rings). When the paper end sensor detects paper out, the state of the interface changes as follows: ERROR signal ~ LOW BUSY signal ~ HIGH PE signal+ HIGH The printer enters an error state when any of the following occurs: a. Home position is not detected after the printer mechanism has been initialized (home position seek). b. The +24V voltage (which is used to drive the printhead and motors) rises to +27V or more. When the printer enters an error state, the printer stops the printing, and the state of the interface changes as follows: ERROR signal ~ LOW BUSY signal ~ HIGH

1.4.6 Printer Initialization and Default Values The LX-800 initialized when any of the following occurs. q The power switch is turned on. q Intetiace signal INIT goes low. When the printer is initialized, the following operations are performed: a. Seek to carriage home position. b. Set to ON-LINE mode. c. Clear the all buffers. d. Set the line spacing to 1/6 inches. e. Set the page length to 11 or 12 inches, according to the DIP switch. f. Clear all vertical tab positions. 9" Set the horizontal tab position to every 8 columns. i. Set the print mode according to the DIP switches. 1-17

REV.-B

1.5 MAIN COMPONENTS
The LX-800 consists of the following components: q Printer Mechanism Model-3A10 (include the Tractor Unit) q ROC Filter Unit q ROCX Board Unit q LCPNL Board Unit q Housing

1.5.1 Printer Mechanism Model-3A10 The Model-3A10 printer mechanism was developed expressly for use with LX-800 printer: the components include a carriage motor, carriage mechanism, paper feed motor, paper feed mechanism, ribbon feed mechanism, printhead, sensors, and the tractor unit. For the tractor unit, there are two tabs on both side frames to allow the printer cover to float slightly when tractor feeding is performed.

Fig. 1-11. Model-3A10 Printer Mechanism

1-18

REV.-A 1.5.2 ROC Filter Unit
The ROC filter unit contains a power cord ( 120 V version) or AC inlet (220/240 V version), power switch,

fuse, filter circuit, and power transformer.

..--

Fig. 1-12. ROC Filter Unit (120V version)

Fig. 1-13. ROC Filter Unit (220 V/240V versions)

1-19

REV.-A 1.5.3 ROCX Board Unit The ROCX board contains the main control circuit, driver circuit, and voltage regulator circuit. The main ICS on the ROCX boards are the pPD78 10HG CPU and the E05A03 gate array which controls everything.

\----=-.

Y

/

Fig. 1-14. ROCX Board Unit

1.5.4 LCPNL Board Unit The LCPNL board unit is a control panel of LX-800 which contains the indicator LEDs, switches and buzzer.

Fig. 1-15. LCPNL Board Unit

1-20

REV.-A 1.5.5 Housing The housing is comprised of the upper and lower cases, and paper feed knob, which accommodate the printer mechanism, ROCX board unit, LCPNL board unit, and ROC filter unit.

Fig. 1-16. Housing

1-21

REV.-A

CHAPTER 2 OPERATING PRINCIPLES
2.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 .. 2.2 CABLE CON NECTIONS....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3. . 2.3 POWER SUPPLY CIRCUIT 2-3

2.3.1 ROC Filter Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 2.3.1.1 Fuse and Filter Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 2.3.1.2 Power Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2-4 . 2.3.2 Regulator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-5. . . . .. 2.3.2.1 Operation Principles of Chopper Type Switching Regulator...............................................2.6 . 2.3.2.2 +24V Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7 2.3.2.3 +5V Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .2-8 2.4 CONTROL CIRCUIT........ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 2.4.1 Functions of the CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 2.4.2 E05A03 Gate Array Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-14 .... 2.4.3 Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-18 2.4.3.1 . Initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-19

2.4.3.2 Print Data Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -20 2.4.4 Reset Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 .. 2.4.5 Carriage Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 2.4.5.1 Home Position Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23 2.4.5.2 Carriage Motor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-24 ... 2.4.5.3 Home Position Seek. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2-26 2.4.5.4 Carriage Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 2.4.6 Paper Feed Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27. . ... 2.4.6.1 Paper End Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 2.4.6.3 Paper Feed Motor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 . 2.4.6.3 Auto Loading Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2-30 2.4.6.4 Paper Feed Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 .. 2.4.7 Printhead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-32 2.4.7.1 Printhead . Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -32

2.4.7.2 Printhead Drive Pulse Width Control Circuit . . . . . . . . . 2-33 2.4.7.3 Printhead Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -34

Z.i

REV.-A . 2.4.8 Print Timing Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -34 2.4.8.1 Print Timing Control for the .. Carriage and Printhead . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-34 2.4.8.2 Bidirectional Logic Seeking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 2.5 PRINTER MECHANISM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37 . 2.5.1 Sensor Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-37 . 2.5.2 Carriage Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -38 . 2.5.3 Paper Feed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 0 2.5.3.1 Friction Feed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 4 0 2.5.3.2 Sprocket Feed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-40 . 2.5.4 Ribbon Feed Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 2

LIST OF FIGURES
. Fig. 2-1. Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2 Fig. 2-2. Power Supply Circuit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 .. Fig. 2-3. Filter Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 . Fig. 24. Power Transformer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 4 Fig. 2-5. +24V/+5V DC Regulator and + 12V Half-Wave Rectifier Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Fig. 2-6. Chopper Switching Regulator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 . Fig. 2-7 Voltage Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6 . Fig. 2-8 +24V Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7 Fig. 2-9 IC494 Block Diagram and Switching Waveform . . . . . . . . . . . . . 2-7 . Fig. 2-10 +5V Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-8 Fig. 2-11. Control Cirucit Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-10 . Fig. 2-12. E05A03 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -14 . Fig. 2-13. LX-800 Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -18 . Fig. 2-14. Initialization Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-19 . Fig. 2-15. Print Data Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-20 .. Fig. 2-16. Line Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 Fig. 2-17. Reset Circuit . . . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -22 Fig. 2-18. Home Position Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-23 Fig. 2-19. Basic Phase Switching Patterns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24 Fig. 2-20. Basic Operation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -24 Fig. 2-21. Home Position Seek Operation Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 Fig. 2-22. Carriage Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-27 Fig. 2-23. Paper End Sensor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -28

2-ii

REV.-A Fig. 2-24. Paper End Detection Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -28 Fig. 2-25. Phase Switching Basic Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 Fig. 2-26. Basic Operation Sequence ................... mm.m.o.m..mm........ ".".a".""""""..- 2-29 . Fig. 2-27. Printing Start Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -30 Fig. 2-28. Paper Feed Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Drive Pulse Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 Fig. 2-30. Printhead Drive Pulse Width Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Fig. 2-29. Printhead Fig. 2-31. +24V DC Monitor Circuit..................................................".."". 2-33 Fig. 2-32. Printhead . Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -34

Fig. 2-33. Solenoid Current and Drive . Voltage Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-34 Fig. 2-34. The Relationship Between the Carriage ... and Control Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35 . Fig. 2-35. Logic Seeking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-36 Fig. 2-36. Printer Mechanism External View (Model-3A10) . . . . . . . . . . . . 2-37 . Fig. 2-37. Carriage Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -38 Fig. 2-38. Printhead Printing Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .2-39 . . Fig. 2-39. Friction Feed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -40 Fig. 2-40. Sprocket Feed Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-41 Fig. 2-41. Ribbon Feed Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -42

LIST OF TABLES
. Table 2-1. Voltage Types and Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Table 2-2. Power Transformer Output Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 Table 2-3. CPU Port Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 . Table 24. E05A03 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-16 Table 2-5. E05A03 Port Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 -17 Table 2-6. Ribbon Feed Gear Train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 4 2

2-iii

REV.-A

2.1 GENERAL
This chapter describes the component connections, specifications and operation of the power supply circuit section, the software for the control circuit section, and the operation of the hardware and the printer mechanism. Please note that the following units are assumed when omitted in this chapter.
Resistor: Capacitor: Units are Ohms. Units are Farads.

The components listed below are referred to as follows: ROCX board: Main board LCPNL board: Control panel Model-3Al O: Printer mechanism

--

.--

2-1

REV.-B

2.2 CABLE CONNECTIONS
Figure 2-1 shows the interconnection of the primary components, with the main board at the center.

I1

MODEL-3A1O PRINTER MECHANISM

J
CR `f;OuOTjR PRINT HEAD PAPER END

I

HOME Posh ON

II
CN5 12pin I CN4 12pin c @ "~ z N v
L

ET= 1
A

g .g Vcn

ROCX BOARD (MAIN
.= N n z g u b

c z `z h
ROCK FILTER UNIT AC120V AC220V AC240V (POWER TRANSFORMER AND FILTER)

BOARD) m~
c co `~ z / * u

36pin CN1

8-BIT PARALLEL l/F /1

r I 1 #8100 SERIES I I l/F BOARD I A--- - - ---1 R

Ail 20V AC220V AC240V

Fig. 2-1. Cable Connections The ROCX board connectors are as follows: CN 1 : 8-bit parallel interface connector. Used for data communication with the host computer. CN2: Connector for the #8 100 series optional interface CN3: Receives data from the LCPNL board switches, and outputs the signals to the LEDs and the buzzer. CN4: Outputs data to the printhead. CN5: Outputs the control signals and drive voltages to the paper feed and carriage motors. CN6: Receives the paper end signal from the printer mechanism. CN7: Receives the home position signal from the printer mechanism. CN8: Receives AC voltages from the ROC filter unit. The pin numbers and functions for each connector are listed in Tables A-8 through A-15 of the APPENDIX.
2-2

REV.-A

2.3 POWER SUPPLY CIRCUIT
This section describes the operation of the ROC filter unit and regulator circuit on the ROCX board. Figure 2-2 shows the block diagram of the power supply circuit. Table 2-1 shows output voltages and their applications. ------ - --- - ------q1
I
i r-l Power SwNch

_-_.
I

---------F2

I
F i l t e r Power

~-

I

I
I Full-Wave Rectifier

-- - - - -- - - - -7 I . I
O + 24VDC I I I O GP I I -- Switching ~ + 5VOC Regulator I Circuit ` ~ GND

I

II Circuit TransI 1 JI I I II T I 1AC2 I I I 1; I II L ------------- -- - - JI I : ~ 1 ROC Filter Unit 4 -- - t Half-Wave I I Rectifier Circuit 4 --

IN

I i

:AC1 ~

~ Switching Regulator and Smoothing Circuit circuit

II

--

1
I I I I o + 12V 0 GND

I I I

I O 12VAC
-- - . I I - - - - - - - - - - - - - - - - - - -A ROCX Board O 12VAC

I k -

Fig. 2-2. Power Supply Circuit Block Diagram Table 2-1. Voltage Types and Applications
Power Voltage + 24 VDC-GP Application Printhead common voltage Paper feed motor drive voltage Carriage motor drive voltage Optional interface board Logic circuit Paper feed motor hold voltage Carriage motor hold voltage Control panel power Optional interface board Optional interface board Optional interface board

+5 VDC-GND

+ 12VDC-GND 12V AC

2.3.1 ROC Filter Unit
The ROC filter unit consists of an AC power cord (or AC power inlet), power switch, fuse, filter circuit, and power transformer. The AC power cord, AC power inlet, fuse, and power transformer differ depending on the power supply voltage. Three kinds of ROC filter units, for 120 V, 220 V, and 240 V, are available.

2-3

REV.-A 2.3.1.1 Fuse and Filter Circuit The AC input from the power line first flows across the power switch and fuse F1. After being filtered by C 1 and C2, it is supplied to the primary side of the power transformer via the L1/C3 noise prevention circuit. Power line noise (external noise) and internal noise from the printer are eliminated by this circuit. The value of fuse F1 changes as follows, according to the power supply voltage: 120 V version: 125 V or 250 V, 1.25 A 220 V version: 250 V, 0.63A 240 V version: 250 V, 0.63A

AC IN

r';;
F1 cl 2200PF x2

Power Switch

. L1 29~H � C3
�

0

To @pin of Power Transformer

0.1 IF
To @pin of 0 Power Transformer

C2 = =

//// Fig. 2-3. Filter Circuit 2.3.1.2 Power Transformer Three types of power transformers, for 240 V, 220 V, and 120 V, are available. The AC voltage from the filter circuit is transformed to the voltages listed in Table 2-2 so that they can be output to the regulator circuit (on the ROCX board) at the next stage. The power transformer includes thermal fuses TF1 and TF2.

TF1

CN 1

a)~ 50/60Hz
@ primary side

T

Gii=El:
Secondary Side

To the ROCX Board

Fig. 2-4. Power Transformer

\.. 2-4

REV.-A Table 2-2. Power Transformer Output Voltages Rated Voltage Type 220V 240V 120V Pin No. 0-0 @-@ a-o n-m No-load AC Voltage [V] 29.3 9.0 29.3 8.96 AC [V] 27.1 8.33 27.7 8.41 DC [V] 32.3 +9.0/� 9.9 33.3 +9.27/� 10.0

NOTE: Column "DC @/]" for the rated voltages indicates the output of the transformer when the ROCX board is connected. The plus and minus values between pins 10 and 9 are different due to the voltage drop across thermal fuse TF2.

2.3.2 Regulator Circuit
AC-tind AC2 output from the ROC filter unit are input to connector CN8 of the ROCX board. The regulator circuit can be divided mainly into two portions, the +24 V/+5 V and + 12 V lines. AC 1 is full-wave rectified by diode bridge DB 1 and converted to +24 V and +5 V via the chopper type switching regulator. AC2 is half-wave rectified by D4-C 10, converted to + 12 V, and input to the optional interface board.

Sc2 Au

3 4

T
1
1

2M-3.ISA-MI Otal-3.1=1 KV 3.15A F2 clq q

m az, ~m 0747
r, r

&_
, r

.24V

20v:

WI

C;t a ,

13A) pPc494c

MT *UK "=*V

= `~'i

`

I **I
I In,

I

04 2M01n3 WI Clo

1000,

R6S O.in 2!3

Fig. 2-5. +24/+5 VDC Regulator and +12 V Half-Wave Rectifier Circuits

2-5

REV.-A 2.3.2.1 Operation Principles of Chopper Type Switching Regulator The operating principle of the switching regulator is illustrated in Figures 2-6 and 2-7. " :fl,~

St

Fig. 2-6 Chopper Switching Regulator Circuit

V/I

1 C) Max = J+
L
=

Vi 1P

VO

.tc

c
to =

=

IPtD + IOt 1

v,

10
~ L

Fig. 2-7 Voltage Waveforms When switching transistor St is on, current Is is supplied to inductor L in proportion to time;
,s =

(vi �L Vo)

t

When energy has accumulated in the inductor L, current 10 is supplied to the load. When St is off, the energy accumulated in L causes current
ID
=

ID

to flow via diode D and to supply load current 10;

Ip � * t

The longer the on-time of St, the more the output voltage increases, and the shorter the on-time of St, the more the output voltage decreases. Theoretically, electric power efficiency is assumed to be 100%; Output voltage Vo = + Vi

2-6

REV.-A 2.3.2.2 +24 V Supply Circuit The +24 V supply circuit is a chopper type switching regulator circuit. Figure 2-8 shows the block diagram of the +24 V supply circuit based on Figure 2-6.
125V 3.1 5A DB1 D3SB1 o
AC1 Q C22 z+

R67 o.47/3w R50 2 4/0 5
a

Q25 C3747

L2 LP401 -02SD Q +24VDC

F2
R49 330

w

AC1 O

6800 /-f 50V (3A) 494

R47 3.3K ZBF503 -01 TA

z ~ ~ C26 2200jL\35V

R46 330 -- Fig. 2-8. +24 V Supply Circuit

OGP

AC 1 input from the ROC filter unit is full-wave rectified by DB 1 and is smoothed by C22. The voltage across C22 becomes 32.3 VDC. Transistors Q23, Q24, and Q25, which are used as Darlington amplifiers, D7, L2 and C26 in Figure 2-8 are equivalent to switching transistor St, flywheel diode D, choke coil L, and smoothing capacitor C in Figure 2-6. Switching is controlled by the 494 (IC3A), and pin 9 of the 494 is the emitter of the internal switching transistor. Therefore, switching is performed as follows: 494 internal transistor: ON ~ Q23: ON ~ Q24: ON ~ Q25: ON 494 internal transistor: OFF ~ Q23: OFF ~ Q24: OFF ~ Q25: OFF Figure 2-9 shows a block diagram of IC 494.

a
+323V DC ~. ---, ! +24VDC

T

& IC 3A ?!"5 Oscdat.r W,v.-fonll

,
f :

,

1

1

i,

1

Q IC 3A Ptn9 1,, "s!s,., W... -from I 1,11

c Q25 Ern,tw W.v.-fom ( f [ ( [ ( (

1/6w GND
v

Fig. 2-9. IC494 Block Diagram and Switching Wava-form
2-7

REV.-A When the printer power is turned on, ZD1 on the +20 VDC line turns on, Q22 turns on, and Vcc is applied to IC 494. Then the oscillator (OSC) starts generating an approximately 20 kHz sawtooth waveform, which is regulated by R40 and C20, and the reference voltage generator outputs the +5 VDC & 10% reference voltage. Internal switching transistor Tr is switched on and off using the output from error amplifiers 1 and 2. EA1 and EA2 limit voltage and current, respectively. EA1 compares the voltage obtained by dividing the +24 V applied to pin 1 by R22 and R21 (approx. 4.9 V) with the + 5 V reference voltage applied to pin 2. EA2 compares the voltage monitored by R66 with the voltage obtained by dividing the +24 V applied to pin 16 by R21 (approx. 0.31 V). Therefore, the current is limited to approximately 3.1 [amps]. 2.3.2.3 +5 V Supply Circuit The +5 V supply circuit is also a chopper type switching regulator, which is the same as the +24 V supply circuit.
L1

+24V o

Q21 C3746 Q20 Al O 15(
20

C9 470P RI 4
2K SRI

~P201 �2R5SD

,

D1 ERB81

R12 33

~1 R1 1 Vvv 330 () R13 2 1 I

78L05A G 13 2 0 �=

�004

0.1-C8

B7 ZBF503 -=01 TA A

1 Ov

GP o

77)7Fig. 2-10. +5 V Supply Circuit When +24 V is applied to this circuit, current flows via R12 and R1 1, and operation of SR1 is started. SR1 includes a +5 V reference voltage generator and compares the voltage at terminal O (pin 2) with the reference voltage. When this voltage is lower than the reference voltage, SR 1 turns terminal I (pin 1 ) on. If the voltage is higher than the reference voltage, SR 1 turns the terminal off. This controls the switching transistors Q20 and Q21, and the output voltage is kept constant. Actual output voltage is 5.024 V (calculated value) because the GND terminal (pin 3) of SR 1 is raised to 0.024 V using the divider composed of R 14 and R 13.

T

Q GND

2-8

REV.-A

2.4 CONTROL CIRCUIT
This section describes the software operation, specifications, and circuit operation of the control circuit (ROCX board). This section consists of the following descriptions: 1. Function of the CPU which controls the overall operation and its peripheral circuits (Section 2.4.1) 2. Gate array function (Section 2.4.2) 3. Outline of the overall firmware operation (Section 2.4.3) 4. Software control and circuit operation of the analog circuits (Sections 2.4.4 through 2.4.8) The control circuit is very simple, and consists mainly of four chips: the CPU, gate array, ROM, and RAM. (Refer to Figure 2-1 1.) The main operation of the control circuit is to control the CPU and the gate array. Other components are described in each section that describes the functions of the CPU and gate array. Figure 2-11 shows a block diagram of the control circuit.

..--

2-9

REV.-A

1

Ill

I

Ill
PESENSOR

PAPER FEEC MOTOR

I

CARRIAGE MOTOR

HOME

I
I
PRINT HEAD

mmoo

.

)mho
-�r

m-m

4<

u

G

ho
<<

m-m

A G.A. E 0 5 A 0 3 B A

--

/

`f")

HOST COMPUTER (OPTIONAL IIF BOARD) Fig. 2-11. Control Circuit Block Diagram

`u'

Fig. 2-11. Control Circuit Block Diagram

2-1o

REV.-B

2.4.1 Functions of the CPU The core of the control circuit is the 78 10H CPU (IC2B). Table 2-3 shows the function of each pin and the related circuits. Table 2-3. CPU Port Assignments Pin Number 1 Port Assignment
PAO

1/0
o

Signal Line
Name CRCOM

Description 1/0 port. Switches the carriage motor drive voltage and the holding voltage. When this signal is HIGH (LOW), the drive voltage (holding voltage) is applied to the carriage motor. Not used.
1/0 port. Switches the paper feed motor drive voltage and the holding voltage. When this signal is HIGH (LOW), the drive voltage (holding voltage) is applied to the paper feed motor. 1/0 port. Reads the state of the LINE FEED switch on the control panel. 1/0 port. Reads the state of the FORM FEED switch on the control panel. 1/0 port. Reads the state of the paper end sensor. When no paper is loaded, this signal goes LOW. Not used. 1/0 port. Reads the P/~ signal from the optional interface.

2 3

PA1 PA2 o

--
PFCOM

4 ` - 5 6 7 8 9 t 16 17

PA3 PA4 PA5 PA6 PA7 PBO ! PB7 Pco

I I

LF SW

FF SW

I

PE SW

--
I I P/s SW1 - 8

1/0 port. Reads the state of DIP SW1.

1 Swl - 1 TXD TXD output port. Outputs the data from the serial 1/0 channel in the CPU to the TXD (transmit data to the host computer) terminal of the optional interface. RXD input port. Used as a receive control signal when the optional serial interface board (for serial/parallel data conversion) is connected. (Data reception detection) 1/0 port. Controls the ON LINE LED on the control panel. When this signal is LOW, the LED lights. INT2 input port. Reads the state of the ON LINE switch on the control panel. Connected to the interrupt controller in the CPU, which executes the ON LINE/OFF LINE switch interrupt routine when this signal is LOW. 1/0 port. Outputs an error signal to the interface board when the printer is in an error state. When this signal is LOW, the printer is in an error state. 1/0 port. Outputs the acknowledge signal to the interface. This signal is LOW active. COO output port. Outputs the drive pulse width signal, which is determined by the timer/event counter in the CPU, to the FIRE terminal of gate array E05A03. This signal is LOW active. 1/0 port. Outputs the buzzer signal to the control panel. When this signal is LOW, the buzzer rings.

o

18

Pcl

I

RXD

19 20

PC2 PC3

o I

ONLINE LP ONLINE SW

21

PC4

o

Em

22 23

PC5 PC6

o 0

ACKNLG FIRE

24

PC7

0

BUZZER

2-11

REV.-A Table 2-3. CPU Port Assignment (cent'd) Pin Number 25 Port Assignment NMI ,,0 I Signal Line Name -- Description Non-maskable interrupt input. The interrupt routine is executed at the trailing edge of this signal. This pin is invalid because it is tied to ground.
Interrupt input. The interrupt routine is executed at the leading edge of this signal. This pin is invalid because it is tied to ground. External memory space setting port. MODES 1 and O (pin 29) are both pulled up to HIGH so that an external memory of 64K bytes (addresses O through FFFFH) can be used. Reset terminal. When this signal is LOW, the printer is reset, and ports A through C and D are set to be high impedance input ports, and port F is set to be an address output (start address OH). Refer to pin 27, MODE 1. CPU external clock input. This printer is driven with a 14.74 MHz clock. The operation codes are fetched at approximately 1.3 MHz, and memory read/write operations are performed at approximately 1.6 MHz. Ground terminal. Ground terminal for the A/D converter in the CPU. Analog input port of the 8-bit A/D converter in the CPU. Reads the states of DIP SW2-1 through SW2-3. Analog input port of the 8-bit A/D converter in the CPU. Reads the state of DIP SW2-4. This signal line is connected to the AUTO FEED XT signal line of the interface. When DIP SW2-4 is ON, the automatic paper feed function is valid. When the DIP switch is OFF, this function is controlled by a signal from the host computer (not fixed). Analog input port for the 8-bit A/D converter in the CPU. Reads the SLCT IN signal from the interface. When the SLCT~ signal is HIGH, DC l/DC3 control from the host computer is valid. When it is LOW, DC l/DC3 control is ignored, and the printer is always selected as a device. (The signal can be tied LOW using jumper J 1.) Analog input port for the 8-bit A/D converter in the CPU. Monitors the +24 V voltage and controls the printhead drive pulse width. Not used. Not used.
Reference voltage input for the 8-bit A/D converter in the CPU. Power supply input for the 8-bit A/D converter in the CPU. Memory read timing strobe signal. Connected to the RD strobe terminal of the gate array and the output enable terminal of the ROM and RAM.

26

INT 1

I

--

27

MODE 1

I

--

28

RESET

I

RESET

29 30 31

MODE O x2

I I

-- --

xl

32 33 34 1 36 37

Vss AVSS ANO i AN2 AN3

-

-- -- SW2-1

I I

1 SW2-3 SW2-4

38

AN4

I

--

39

AN5

I

+24

40 41 42
43 44

AN6 AN7
VAREF A VC C m

I I o

-- --
-- -- m

2-12

REV.-B Table 2-3. CPU Port Assignment (cent'd) Pin Number
45

Port ~ssignment WR

1/0
o

Signal Line Name WR

Description
Memory write timing strobe signal. Connected to the WR strobe terminal of the gate array and the write enable terminal of the RAM. Address latch enable signal. Controls address latching performed inside the gate array (enables latching when the signal is HIGH). 8-bit 1/0 ports with output latch. Used as the upper address bus according to the MODE 0/1 terminal selection. For 64K external memory assignment), Al 3 through Al 5 are input to the address decoder in the gate array. Multiplexed addressldata bus. Used as the lower address and data bus. Power supply for the.-- internal RAM (+5 VDC). Power supply for the CPU (+5 VDC). When this voltage is not stable, such as at either a leading or trailing edge (when the printer power is turned on or off), the reset circuit prevents the CPU from running.

46

ALE

0

ALE

47 1 54 55 1 62 63 .-- 64

PFO 1 PF7 PDO ! PD7
VD
D

A8 0 [ A 15 DBO (AO) 1/0 ! DB7 (A7)
I

--

Vcc

I

NOTES: 1. All barred signal are LOW active. 2. "1/0" denotes either input or output when viewing the signal from the CPU.

2-13

REV.-A

2.4.2 E05A03 Gate Array Functions
This section describes the E05A03 functions. Figure 2-12 shows the E05A03 block diagram.

(3
STROBE

TIMING REGISTER

I NO-7

LATCH (Input Data)

I
DBO-7 ALE

I

I

PRINTHEAD DRIVER
DB6

--

1 I

A

I

1

-

I II

I I I I I ~' I

L

1 l-l

DB7 CARRIAGE MOTOR DRIVER

IATCH

(ControIl (w

BUSY ~T RESET (RESI) AB15 AM4 AB13 RESO

Fig. 2-12. E05A03 Block Diagram

2-14

REV.-A
Functions of the E05A03 gate array (IC3B) are as follows: 1. Address latch The gate array latches data on address data lines DBO - DB7 at the leading edge of the ALE signal,

and outputs it to ABO - AB7 (when ALE is high, the data is passed through without latching.) 2. Address mapping

---- The gate array inputs an address on AB 13- AB 15, and selects CS 1 or CS2 or enables the R/W mode of this gate array using internal decoder 2. 3. Handshaking q The gate array latches data on INO - IN7 at the leading edge of the STROBE signal, and automatically outputs the BUSY signal. The BUSY signal (DB7) is latched by the timing register to inform the CPU that data has been transmitted to the CPU. q The timing for the BUSY signal, which is set at either the trailing or leading edge of the STROBE signal, is selected by the control program (firmware). q The BUSY signal output from the timing register is wire-ORed with the BUSY signal controlled by the ---- firmware. 4. Printhead solenoid drive pulse . When the FIRE signal from the CPU is brought Low, the data that was previously latched is output on HD 1 - HD9 to drive the corresponding solenoids in the printhead. q When FIRE is high, HDI - HD9 are all low. 5. Shift register q This gate array includes a shift register (8bits X 3), and the MSB (Most Significant Bit) can be read by accessing the specified address (XX03H) once. The data is shifted one bit to the left at the leading edge of the ~ signal. 6. Initialization ---- When the INIT or RESI signal is low, the gate array sets RESO low and initializes the following. q Printhead latch (HD 1 - HD9 are all set low even if FIRE is low.) q PF motor latch (PFA - PFD) are all set low.) ---- q CR motor latch (CRA - CRD) are all set high.) . Timing generator (enters the state indicating that no data has been received.) q Control latch (BUSY is set high (software-BUSY), PE is set low, and PELP, NLQLP, and CNDLP are set high.) 7. Address decoder 2 Address decoder 2 selects one of the twelve modes listed in Table 2-13 according to the combination of lower address bits OOH - 07H, ~, and ~. .--

2-15

REV.-A Table 2-4 shows the E05A03 functions and Table 2-5 shows the E05A03 pin functions. Table 2-4. E05A03 Functions
Lower Address R/W Pin Name

Function Reads the data which was latched using STROBE, and resets the STROBE-BUSY output. Writes data to the upper eight bits of the 24-bit shift register
(DB7 - DBO ~ Bits 23 - 16). Bit 7: 1 (Indicates the trailing edge of the STROBE signal.) Bit 6: 1 (The HOME input is HIGH.) Writes data to the middle eight bits of the 24-bit shift register (DB7 - DBO ~ Bits 15 - 8). Directly reads INO - IN7. Does not affect the BUSY signal. Writes data to the lower eight bits of the 24-bit shift register (DB7 - DBO ~ Bits 7 - o). Reads the MSB of the 24-bit shift register and shifts the data one bit to the left (MSB ~ DB7). Bit 7: 1 (The BUSY signal is output at the leading edge of STROBE.) O (The BUSY signal is output at the trailing edge of STROBE.) Bit 6: 1 (Resets software-BUSY.) O (Sets software-BUSY.) Bit 4: 1 (NLQLP is LOW.) q See NOTES 2. 0 (NLQLP is HIGH.) Bit 3: 1 (CNDL is LOW.) `See NOTES 2. 0 (CNDL is HIGH.) Bit 2: 1 (PE is HIGH and PELP LOW.) O (PE is LOW and PELP HIGH.) Latches (and inverts) the data for pins 1 - 8 of the printhead. (DB7 - DBO ~ HD1 - HD8 Data is output when FIRE goes LOW.) Latches (and inverts) the data for pin 9 of the printhead. (DB7 ~ HD9 Data is output when FIRE goes LOW.) Latches the phase data for the PF motor. (DB7 - DB4 ~ PFA - PFD) Latches the phase data for the CR motor. (DB3 - DBO ~ CRA - CRD)

R OOH w
R OIH w R 02H w R

INO - IN7
-- STRB HOME -- INO - IN7 -- --

BUSY 03H w NLQLP CNDLP PE PELP

04H

w
w w w

HD1 - HD8

05H 06H 07H

HD9 PFA - PFD ---- CRA - CRD

NOTES: 1. The above functions are mapped to every eight bytes from COOOH to DFFFH. 2. These are not used in this printer.

2-16

Table 2-5. E05A03 Port Assignments Pin No. 1 2
3 4 5 6 7 8
1 15 16

Signal Vcc NL