Epson FX-1170, FX-870 Service Manual

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Page 1

EPSON

EPSON TERMINAL PRINTER

FX-870/1170

SERVICE MANUAL

4001461

REV.-A

Page 2

.-.

. .

{’”’

-.. ,

NOTICE

whatsoever without SEIKO EPSON’s express written permission is forbidden. “ The contents of this manual are subject to change without notice. “ 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. “ The above notwithstanding SEIKO EPSON can assume no responsibility for any

errors in this manual or the consequences thereof.

Nagano, Japan

-i-

Page 3

REV.-A

PRECAUTIONS

Precautionary notations throughout the text are categorized relative to 1 ) personal injury, and 2) damage

to equipment:

DANGER

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.

Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by a DANGER headings.

DANGER

ALWAYS DISCONNECT THE PRODUCT FROM BOTH THE POWER SOURCE AND THE HOST COMPUTER BEFORE PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURE.

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. 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

REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.

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. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE

3. POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.

/.LP

IN ORDER TO PROTECT SENSITIVE

4. DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

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.

CHIPS AND CIRCUITRY, USE STATIC

– ii -

Page 4

PREFACE

This manual describes functions, theory of electrical and mechanical operations, maintenance, and repair of the The instructions and procedures included herein are intended for the experienced repair technician, precautions on the preceding page. The chapters are organized as follows:

and attention should be given to the

FX-870/l

170.

REV.-A

Chapter 1 -

Chapter 2 -

Chapter 3 -

Chapter 4 -

Chapter 5 -

Chapter 6 -

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

Provides a general product overview, lists specifications, and illustrates the main components of the printer.

Describes the theory of printer operation.

Includes a step-by-step guide for product disassembly and

assembly.

Includes a step-by-step guide for adjustment.

Provides Epson-approved techniques for troubleshooting.

Describes preventive maintenance techniques.

iv -

Page 5

REVISION SHEET

.7,,

,. :;::

. .

REVISON

DATE ISSUED

June 15, 1992

CHANGE DOCUMENT

1st issue

-v–

(“

‘?:

Page 6

REV.-A

CHAPTER 1.

CHAPTER 2. CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENTS CHAPTER 5. CHAPTER

APPENDIX

GENERAL DESCRIPTION OPERATING PRINCIPLES

TROUBLESHOOTING

MAINTENANCE

–

vi -

Page 7

CHAPTER 1

GENERAL DESCRIPTION

REV.-A

1.1

Scope

1.2 Specifications

1.3 Interface

1.4 Control Panel

1.5 Functions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.1.1 Features

1.1.2 Options

1.2.1 Hardware Specifications

1.2.1.1 Printing Method

1.2.1.2 Paper Handling

1.2.1.3 Paper Specifications

1.2.1.4 Printable Area

1.2.1.5 Ribbon

1.2.1.6 Electrical Specifications

1.2.1.7 Environmental Conditions

1.2.1.8 Reliability

1.2.1.9 Safety Approvals

1.2.2 Firmware Specifications

1.2.2.1 Print Control

1.2.2.2 Input Data Buffer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.3.1 Parallel Interface

1.3.2 Optional Interface

1.4.1 Components

1.4.2 Buttons

1.4.3 Indicators

1.5.1 Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5.2 Power On Default Settings

1.5.3 Buffer-full Printing

1.5.4 Hexadecimal Dump

1.5.5 Self Test

1.5.6 Paper-out Detection

1.5.7 Auto Tear-off

1.5.8 Thermal Protection

1.5.9 High Duty Printing

1.5.10 Sheet Loading and Sheet Ejection

1.5.11 Adjust Lever Operation

1.5.12 Printer Initialization

1.5.13 Buzzer ................. o.... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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1-1 1-1

1-3

1-4

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Cattridge

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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1-4 1-4 1-4 1-6

1-9 1-11 1-12 1-12 1-13 1-13 1-13

1-13 1-14 1-15 1-15 1-17

1-17 1-17 1-18 1-19

1-20

. 1-20

1-23 1-23 1-23 1-24 1-24 1-24

1-24 1-24 1-25 1-25 1-26

. 1-27

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REV.-A

1.6 Main Components

1.6.1 BOARDASSEMBLY,C094MAlN(Main ControlCircuitBoard) ............1-29

1.6.2

BOARDASSEMBLY,C094PNL(Control Pand~HtiWd) .....-.l-3O

1.6.3 BOARD ASSEMBLY,

1.6.4 Printer Mechanism

1.6.5 Housing Assembly

~~ti...m-.--.--...--.-.m.m..-.mm.

C076PSBFSE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

........................................1-28

(Power

SuPPIY

circuit Board) ......1 -30

1-31 1-32

LIST OF FIGURES

Figure 1-1. External View of Figure 1-2. Pin Configuration Figure 1-3. Printable Area for Cut Sheets Figure 1-4. Printable Area for Continuous Paper Figure 1-5. Printable Area for Roll Paper Figure 1-6. Data Transmission Timing figure 1-7. Control Panel Figure 1-8. Hexadecimal Dump Printout Figure 1-9. Self Test Printout Figure 1-10. Lever Positions Figure 1-11. Main Components Figure 1-12. BOARD ASSEMBLY,

Figure 1-13. BOARD ASSEMBLY, C094 PNL (Control Panel Figure 1-14. BOARD Figure 1-15. Printer Mechanism

Figure 1-16. Housing Assembly

ASSEMBLY, C076

FX-870/1170

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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C094MAIN

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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(Main Control

PSB/PSE

(Power Supply Circuit Board) .....1 -30

circuit

Board) ...........1 -29

Cimuit

Board) .............1 -30

1-2 1-4

1-9 1-1o 1-11 1-15 1-17 1-23 1-24 1-26 1-28

1-31 1-32

Iii

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Page 9

LIST OF TABLES

REV.-A

Table 1-1. Line Feed Speed (1 line= 1/6”) Table 1-2. Specifications for Cut Table 1-3. Specifications for Table 1-4. Specifications for Continuous Paper Table 1-5. Specifications for Envelopes Table 1-6. Specifications for Labels Table 1-7. Specifications for Roll Paper Table 1-8. Electrical Specifications for 120V Model Table 1-9. Electrical Specifications for Table 1-10. Environmental Conditions

Table 1-11. Character Size and Pitch Table 1-12. Printable Columns Table 1-13. Print Speed

Table 1-14. Connector Pin Assignments and Signal Functions . . . . . . . . . . . . . . . . . . . . . 1-15

Table 1-15. Optional Interface Table 1-16. Group 1 Features

Table 1-17. Group 2 Features Table 1-18. Group 2 Features (IBM Mode) Table 1-19. Group 3 Features (Power-on Settings) Table 1-20. Lever Positions

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Sheets (plain paPer)

Cut She*s

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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(ESC/P

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(carbonless Dwli-tim

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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220/240V Model

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Mode)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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paPer) ...”.s 1-7

1-5 1-6

1-7 1-7 1-8

1-8 1-12 1-12 1-12 1-14

1-14 1-14

1-17 1-21 1-22

1-22 1-23

1-25

l-iii

Page 10

1.1

Scope

REV.-A

These specifications apply to the

EPSON

FX-87WI 170 dot matrix Printer.

1.1.1 Features

● Upward compatibility with the FX-850(+)/1050(+), FX-800/1000, FX-86e/286e

● 380

cps

(high-speed draft for both 80 and 136-column models)

● 285

cps

(draft pica), 342

● Advanced paper handling

CPS

(draft elite)

Continuous paper

-3 paths for insertion (front/bottom/rear)

- Dual paper park and auto load (front/rear)

- The standard tractor unit can be set to 3 positions (2 push and 1 pull)

- Continuous paper can be used without removing the cut-sheet feeder

(CSF)

Cut sheets

-2 paths for insertion (top/optional front)

- Auto loading

● 24K byte input buffer

● 16 character tables are supported for European model.

(Italic, pC437,

● 6 character tables are supported for Non-European model.

(Italic, pC437,

● Default setting mode replaces DIP switches.

● Type B optional l/F boards can be installed.

850,860,863,865, 437 Greek, 851,869,852,853,857, 855,866, GOST, 861)

850,860,863, 865)

Figure 1-1 shows an exterior view of the

FX-870/l 170.

1-1

Page 11

REV.-A

r~..

. . .

“

80-column model

136-column model

Figure 1-1. External View of the FX-870/1170

1-2

. ,.

Page 12

1.1.2 Options

REV.-A

C806371 C806372 C806391 C806392

C806381 C806382 C806401

C806402

C800201

C800202

C800211 (U.S. version) C800212 (other)

C814001

C814011

C82305 C82306 C82307 C82308 C8231O

C82311 (mm screw)

C82313

(U.S. version)

(other)

(U.S. version)

(other)

(U.S. version) (other) (U.S. version)

(other)

(U.S. version)

(other)

(inch screw) (mm screw) (inch screw) (mm screw) (inch screw)

Plain cut sheet feeder ( 80-column) Plain cut sheet feeder ( 80-column) Plain cut sheet feeder (136-column) Plain cut sheet feeder (136-column)

Cut sheet feeder ( 80-column) Cut sheet feeder ( 80-column) Cut sheet feeder (136-column) Cut sheet feeder (136-column)

Tractor unit ( 80-column) Tractor unit ( 80-column) Tractor unit (136-column) Tractor unit (136-column)

Front sheet guide ( 80-column)

Front sheet guide (136-column)

Serial l/F card Serial l/F card

32KB

intelligent serial l/F card

32KB

intelligent serial l/F card

32KB

intelligent parallel l/F card

32KB

intelligent parallel l/F card

32KB

IEEE-488 l/F card

#8750 #8755(M) #8758

#8310

Fabric ribbon cartridge ( 80-column) Fabric ribbon cartridge (136-column) Fabric ribbon sub cartridge

Roll paper holder (only for 80-column model)

1-3

Page 13

REV.-A

1.2 Specifications

1.2.1 Hardware Specifications

1.2.1.1 Printing Method

Printing method:

Pin configuration: 9 wires

Impact dot matrix

(diameter 0.29 mm)

wire

2+---

3 ‘ -------

0.35mm (lf12”)

Dot matrix:

1.2.1.2 Paper Handling

Feeding method:

Fanfold: Cut sheet: Envelope: Label: Roll:

Line spacing:

9 x 7 matrix (high-speed draft) 9 x 9 matrix (draft)

18x 23 matrix

Friction feed (front/top) Push tractor feed

Pull tractor feed (front./rear/bottom) Push-pull tractor feed (front/rear)

Tractor feed

Friction feed Friction feed

Tractor feed

Friction feed

1/6”, 1/8”, or programmable (min.1/216”)

Figure 1-2. Pin Configuration

(NLQ)

(frontfrear)

.=.

!..,

{....;’

1-4

Page 14

REV.-A

* Thin:

Thick:

Table 1-1. Line Feed Speed (1

Intermittent feed

Type of paper

Fanfold paper

Cut sheet (manual)

Cut sheet

(CSF)

Thin

Thick

Thickness is less than or equal to 0.18 mm. Thickness is more than 0.18 mm.

iine

1/6”)

Continuous feed

Thin

(ips)

Thick

55 (3.0) 66 (2.5)

45 (3.7) 55 (3.0)

48 (3.5) 55 (3.0)

(ips)

***** precautions for Handling Paper *****

1 ) Friction feed

● Set the release lever to the FRICTION position.

● Load the paper from the front or top entrance.

● Do not use continuous paper.

● Do not perform any reverse paper feeds within the top 8.5 m m area and bottom 22 mm area.

● Do not perform reverse feeds greater than 1/6” after the paper end has been detected.

● Use the paper-tension unit.

● Insert the multi-part cut sheet forms only from the front.

2) Push tractor feed

● Set the release lever to the REAR PUSH/FRONT PUSH position.

● Load the paper from the rear or front entrance.

● Release the friction feed mechanism.

●

M u Iti-part paper must be carbonless.

● Use the paper-tension unit.

● Do not perform reverse feeds greater than 1/6”.

● Do not perform reverse feeding after the paper end has been detected, because accuracy of paper feed

cannot be assured.

1-5

Page 15

REV.-A

“-

3) Pull tractor feed

● Set the release lever to the PULL position.

● Load the paper from the front, rear, or bottom entrance.

(The front or bottom entrance is recommended for thick paper or

● Release the friction feed mechanism.

● Remove the paper-tension unit and attach the pull tractor unit.

● Insert the paper from either front or bottom.

● Multi-part paper must be carbonless.

● Do not perform reverse feeds.

labels.)

4) Push-pull tractor feed

● Set the release lever to the REAR PUSH/FRONT PUSH position.

● Load the paper from the front or rear entrance.

● Release the friction feed mechanism.

● Remove the paper-tension unit and attach the pull tractor unit.

Remove any slack in the paper between the platen and the pull tractor.

Precisely adjust the horizontal position of the pull tractor and push tractor.

● Multi-part paper must be carbonless.

● Do not perform reverse feeds greater than 1/6”.

● Do not perform reverse feeds after the paper end has been detected.

1.2.1.3 Paper Specifications

See Tables 1-2, 1-3, 1-4, 1-5, 1-6, and 1-7. Recycled paper, envelopes, and labels require the following environmental conditions.

Normal environment

Temperature: 15-25 deg. C (59-68 deg. F)

?!.

Humidity: 30-60

Table 1-2. Specifications for Cut Sheets (Plain Paper)

Width

top insertion

148-257 mm (5.8-10.1”) 148-420 mm (5.8-16.5”)

front insertion 182-257 mm (7.2-10.1”)

182-364 mm (7.2-14.3”)

364

Length Thickness Weight Quality

Up to

0.065-0.14 mm 14-24 lb (45-78 Kg) (52.3-90

Plain paper

mm (14.3”)

(0.0025-0.0055”)

g/m2)

80-column

136-column

80-column

136-column

Recycled paper (in normal environment)

●

... -

1-6

Page 16

- . .

- . - .,. . .

1 ame 1-s. specmcawons lor uu~ mee~s [eamomess uupncamng raper]

-A

-,- - —A— ,-—

..L . -.

m .

——

R-

--–

-—

A,.-

— m- —--i

Width

front insertion

Length

Quality Thickness Weight

Copies

182-257 mm (7.2-10.1”) 182-364 mm

(7.2-14.3”)

Up to 297 mm (1 1.7”) Up to 364 mm (14.3”) Carbonless duplicating paper

0.12-0.22 mm (0.0047-0.0086”) 12-15 lb (34-50 kg) (40-58

g/m2)

4 sheets (1 original + 3 copies) maximum

80-column

136-column

80-column

136-column

- each

Table 1-4. Specifications for Continuous Paper

REV.-A

Width

101-254 mm (4-10”) 101-406 mm (4-16”)

Thickness Weight

Quality

0.065-0.32 mm (0.0025-0.012”)

14-22 lb (45-70 kg) (52.3-82 12-15 lb (34-50 kg) (40-58.2

g/m2)

Plain or carbonless duplicating paper Recycled paper (in normal environment) (with push tractor and optional pull tractor)

Copies

4 sheets (1 original + 3 copies) maximum

Table 1-5. Specifications for Envelopes

Size

No.

166 mm x 92 mm

No. 10 240 mm x 104 mm

Thickness

0.16-0.52 mm (0.0063-0.0197”) * Differences in thickness within the printing area

must be less than 0.25 mm (0.0098”).

Weight 12-24 lb (39-78 kg) (45-91

g/m2)

Quality Bond paper, plain paper, airmail

80-column

136-column

- single sheet

- each

Notes: 1) Envelopes must be inserted from the top.

2) Keep the longer side of the envelope horizontal during insertion.

3) Set the left edge of a No. 6 envelope at the sheet guide setting mark.

4) Do not feed envelopes with the cut sheet feeder.

1-7

Page 17

REV.-A

Table 1-6. Specifications for Labels

“:%

Size

Thickness

Quality

Notes: 1) Labels must be fanfold.

2) Example of labels

3) Labels should be used with the pull tractor (front, bottom), or with the front push tractor.

4) Do not perform reverse feed at any time. (including by

5) Remove labels from the paper path when not in use.

Size Thickness Weight

Quality

2 1/2” X 15/16”

15/16”

4“ 4“ X 17/16”

0.07-0.09 mm (0.0028-0.0031”) - base paper

0.16-0.19 mm Plain paper

AVERY CONTINUOUS FORM AVERY MINI-LINE LABELS

Table 1-7. Specifications for Roll Paper

216

+/-

3 mm (8.5

0.07-0.09 mm

14-22

Plain paper

(0.0063-0.0075”) -

IABELS

+/-

0.12”)

(0.0028-0.0035”)

lb (45-70 Kg) (52.3-82

total

hand).

g/m2)

z i

.3.,

Note: Roll paper isavailable only forthe 80-column model optionally, and itsdiameter must notexceed 127

mm (5”).

.%,

,.,

[“

,: ,.,

1-8

. . ,.

Page 18

1.2.1.4 Printable Area

Cut sheets

top insertion

front insertion

148-257 mm (5.8-10.1”): 148-420 mm (5.8-16.5”) : 136 columns 182-257 mm (7.2-10.1”):

182-364 mm (7.2-14.3”):

columns

136

columns

REV.-A

●

~ ABCD

Printable Area

T“

WXYZ

I ABCD

Figure 1-3. Printable Area for Cut Sheets

* 1 3.0 mm (0.1 2“) or more when the paper width is less than 364 mm (14.3”). 25 mm

the paper width is 420 mm (16.5”).

3.0 mm (0.12”) or more.

Note:

Paper feed accuracy cannot be assured within 24 mm (0.94”) from the bottom edge of the paper.

Paper feed accuracy cannot be assured within 48.5 mm paper.

1-9

(1.9”)

WXYZ

-1-

from the bottom edge of the

(0.9”)

or more when

(136-column)

( 80-column)

(top insertion)

(front insertion)

Page 19

REV.-A

2) Continuous paper

ABCD

Printable Area

WXYZ

ABCD

4--

Figure 1-4. Printable Area for Continuous Paper

*1 13 mm (0.51”) or more when the paper width is 101 mm to 241 mm (4” to 9.5”). 25 mm (1.0”) or more

when the paper width is 254 mm (10”).

13 mm (0.51”) or more when the paper width is 101 mm to 377.8 mm (4” to 14.87”). 25 mm or more

when the paper width is 381 mm to 406 mm (15” to 16”).

WXYZ

( 80 columns) . .

(136 columns)

~~. 1

1-1o

Page 20

3) Roll paper (80-column model only)

top insertion

216 +/- 3 mm (8.5

●

ABCD

. .

+/-

0.12”)

101-254 mm (4-10”): 80 columns 101-406

(4-16”): 136 columns

Printable Area

WXYZ

o 0

.--0.

0 0 0 0 0 0

0 0

o 0

0 0

REV.-A

*1 3.0

Note:

1.2.1.5

Ribbon

Color

Life of ribbon

mm (0.1 2“) or more

Paper feed accuracy cannot be assured within 24 mm (0.94”) from the bottom edge of the paper.

Ribbon Cartridge

Figure 1-5. Printable Area for Roll Paper

Cartridge type (same as FX series)

# 8750 # 8755(M) # 8758- Subcartridge

Black

3 x 106 characters (at

14 dots/character)

(top insertion only)

- 80-column model

- 136-column model

1-11

Page 21

REV.-A

1.2.1.6 Electrical Specifications

See Table 1-8 and 1-9.

Table 1-8. Electrical Specifications for 120V Model

Rated voltage Input voltage range Rated frequency range Input frequency range Rated current Power consumption

Dielectric strength

Table 1-9. Electrical Specifications for

120

VAC

103.5-132 V AC 50-60 Hz

49.5-60.5 Hz

1.8 A

Approx. Approx. 45 W (136 columns)

(Self test in draft mode, 10

1.0 (Between AC line and chassis)

45 W ( 80 columns)

kVAC, 1

second

220/240V

cpi)

Model

. .

. . . . .

Rated voltage Input voltage range Rated frequency range

Input frequency range Rated current Power consumption

Dielectric strength

1.2.1.7 Environmental Conditions

Table 1-10. Environmental Conditions

Temperature

Humidity 10 to 80

5 to 35

-30 to 60

5 to 85

deg.C

220-240

198-264 VAC

50-60 Hz

49.5-60.5 Hz

0.9 A

Approx. 45 W ( 80 columns) Approx. 45 W (136 columns)

(Self test in draft mode, 10

1.5

(Between AC line and chassis)

(41 to 95 deg. F) — operating

deg.C

(-22 to 140 deg. F) — in shipment container

‘Y. RH — operating

RH — non-operating

kVAC,

VAC

1 second

cpi)

f“-

Resistance to shock

Resistance to vibration

IG, within 1 ms — operating

2G, within 1 ms — non-operating

0.25G, 55 Hz max. — operating

0.50G,

55 Hz max. — non-operating

1-12

Page 22

1.2.1.8 Reliability

REV.-A

MCBF

MTBF

(expected value)

5 million lines (excluding a printhead)

(MCBF:

Mean Cycles Between Failures)

4000 power on hours (duty cycle

6000 power on hours (duty cycle

Printhead

(MTBF

Life

: Mean Time Between Failures)

100 million characters (14 dots/character)

1.2.1.9 Safety Approvals

Safety standards

UL1950 CSA22.2#220

EN 60950

R.F.I

FCC class B

VDE0871

1.2.2 Firmware Specifications

with D3

(TUV)

(Self certification)

25Yo)

— 80-column model

25Yo)

—136-column model

(U.S.A model)

(EUR

model)

(U.S.A model)

(EUR

model)

1.2.2.1 Print Control

Printing direction

Text mode Bidirectional printing with logic seeking.

(Unidirectional printing can be specified by software.)

Bit image mode Unidirectional printing

Character sets

—

ESC/P

mode —

ASCII characters

International characters (13 countries) and their italics PC 437,850,860,863,865, 437 Greek, 851,869,852,853,857, 855,866, GOST, 861 (European

model) PC 437,850,860,863,865 (Non-European model)

— IBM mode —

PC 473,865 (PC = Personal Computer character table ) Fonts: Draft,

NLQ

Roman,

NLQ

Saris serif

1-13

Page 23

REV.-A

Table 1-11. Character Size and Pitch

Type of letters I Width I Height I Character pitch

[mm] Pica Condensed Elite

Condensed elite \ 0.85

Table 1-12. Printable Columns

2.1

1.05

1.7 3.1

[mm]

3.1

[mm]

2.54 (10

1.48 (17

2.11 (12

1.27 (20

cpi) cpi) cpi) cpi)

f’

.,.-

.,’;:

Notes: 1)

Type of letters Printable columns

80-column model 136-column model

The printing speed for high speed draft is reduced to the value in “( )“ with thick paper (over 0.18 mm).

The printing speed for high speed draft is reduced to the value of “draft pica” when any graphic character is in the line.

The printing speed for draft is reduced to the value in “[ ]“ when any italic character is in the line.

The speed for high duty printing is reduced to approximately half of each speed, except for the

printing speed in “[ l“.

Pica

Condensed

Elite 96 163

Condensed elite

Table 1-13. Print Speed

Type of letters High-speed draft Draft pica Draft elite Condensed draft pica Emphasized draft pica

NLQ

normal pica

I I

137

160

380 285 342 243 142

speed

(320) [1421 [142] [170] [122]

[ 711

[cm]

[cpl]

136

233

272

I I

1.2.2.2 Input Data Buffer

24K

or OK bytes (selectable with power on default settings; see Section 1.5.2. )

1-14

Page 24

, 1.3 Interface

This printer has a built-in, 8-bit centronics parallel interface.

1.3.1 Parallel Interface

REV.-A

Data transmission mode Synchronization Handshaking Logic level Connector plug

It is recommended that the interface cable be as

DATA

STROBE

: 0.5 us (min.) t2: 7 us t3: 5 us

8-bit parallel

Controlled by external STROBE pulse. Controlled by ACKNLG and BUSY signals.

ITL-

compatible

57-30360 (Amphenol) or equivalent

tl tl tl

(approx.) (approx.)

short

as possible

:...

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

(10

feet maximum).

Signal

Pin No. Pin No.

Return

4 5 6 7 8 26

20 DATA 1 21 22 23 24 25

Figure 1-6. Data Transmission Timing

Table 1-14. Connector Pin Assignments and Signal Functions

Signal Name

STROBE

DATA 2

DATA 3

DATA 4

DATA 5

DATA 6

DATA 7

Dir.

In In In In In In In

STROBE pulse to read data in. Pulse width must be more than

0.5 Bs at receiving terminal. These signals represent the 1st to 8th bits of parallel data, respectively. Each signal is HIGH when data is a logical 1 and LOW when a logical O.

Description

1-15

Page 25

REV.-A

Signal

Pin No.

12 13 14

15 16 17

9 to 30 —

33 34 35 36 —

Return

Pin No.

30 — —

— — —

—

— — —

Signal Name

ACKNLG

BUSY

—

AUTO FEED

NC Ov CHASSIS

GND

INIT

ERROR

GND

— —

SLCT IN

Dir.

out

—

— —

—

— —

out

— —

(Continued)

Description

Approx.12 received and that the printer is ready to accept more data. A HIGH signal indicates that the printer cannot receive more data. The signal becomes HIGH in the following cases:

1. During data entry

2. During input buffer full

3. During printer error status A HIGH signal indicates that the printer is out of paper. Pulled up to +5V through a 3.3 K-ohm resistor. When this signal is LOW, paper is automatically fed one line

upon receipt of a CR code.

(The signal level can be set LOW by default.)

Not used. Logic GND level. Printer chassis GND.

In the printer, the chassis

circuited.

Not used. TWISTED-PAIR RETURN signal When the level of this signal becomes LOW, the printer

controller is reset to its initial state and the print buffer is

cleared. This signal is normally atthe HIGH level, and its pulse width must be more than 50 ps at the receiving terminal. The level of this signal becomes LOW when the printer is in —

1. Paper-out status

2. Error status TWISTED-PAIR RETURN signal GND level.

Not used.

Pulled up to The data between

is HIGH.

(The level of this signal is factory set to LOW.)

pulse. LOW indicates that data has been

GND and the logic GND are

GND level.

+5V

through a 3.3 K-ohm resistor.

DC3

and DCI is invalid when this signal

short-

.- ...,

. . .

‘

Notes: 1 ) Direction of signal flow is as viewed from the printer.

2) Return means TWISTED PAIR RETURN and is to be connected at signal ground level.

3) Be sure to use a twisted-pair cable for each signal and always complete connection on the return side. To prevent noise effectively, these cables should be shielded and connected to the chassis

of the host computer and the printer, respectively.

4) All interface conditions are based on

less than 0.2

5) Data transfer must not be carried out by ignoring the

(Data transfer to this printer can be carried out only after confirming the

the level of the BUSY signal is LOW.)

VS.

ITL

level. Both the rise and

1-16

ACKNLG

fall

times of each signal must be

or BUSY signal.

ACKNLG

signal or when .

.,.

Page 26

, 1.3.2 Optional Interface

The following interface cards can be used for this printer.

Table 1-15. Optional Interface

Catalog #

C82305* (inch screw) C82306* (inch screw)

C82307* (inch screw)

C82308* (inch screw) C8231O* (inch screw) C82312* (inch screw) C82313* (inch screw) C82314* (inch screw) C82315* (inch screw) Twinax l/F card

Note: The last digit of catalog # “*” varies depending on the country.

Serial I/F card

Serial l/F card

32KB

intelligent serial l/F card

32KB

intelligent serial l/F card

32KB

intelligent parallel l/F card

32KB

intelligent parallel l/F card

Local Talk l/F card card

Coax l/F card

Type

REV.-A

1.4 Control Panel

1.4.1 Components

Buttons

OPERATE

PAUSE/TEAR OFF PAPER FEED FONT

l--

Figure 1-7. Control Panel

lock type button

(non-lock Push type buttons)

Indicators

READY — (green) FONT (Draft, Roman, Saris CONDENSED — (green)

3 LEDs

serif) — (green)

1-17

Page 27

REV.-A

1.4.2 Buttons

[PAUSEI

Selects printing or pause alternately when there is some data to print in the input buffer.

Advances continuous paper to tear-off position when the printer has printed all received data and is ready to receive more print data.

,:.,

[PAPER

Advances the paper line by line using the current line spacing setting while the printer is ready to print or

paused by PAUSE button. Holding down the button for about 1 second, it advances the paper to the next top-of-form

Loads continuous paper inserted in the push tractor or cut sheets in the CSF when the printer has detected a paper out.

[FONT]

Selects (Draft (The factory setting k the Draft, uncondensed font)

The selection is executed when the button is released. The selection is stored in non-volatile memory.

Enables the micro feed function when pressed along the PAUSE or PAPER FEED button. The micro feed function is described below.

FEEDI

NLQ

Roman,

~Draft cond.~

NLQ

Saris serif, Draft, and condensed of those 3 fonts in rotation:

Roman~

Roman

cond.~

Sans.~

Saris.

cond.~

Draft

~Draft cond.

(TOF)

position.

....)

‘“’

FONTI+[PAUSEI

Activates the function. as described below:

[FONT]+ [PAUSE]

IFONTI+[PAPER FEEDI

The PAUSE and PAPER FEED buttons micro-adjust the paper position up or down,

1-18

: . .

. . . .

. .

Page 28

REV.-A

Advances the paper forward by

1/108

inch per step.

IFONTl+[pApER FEEDI

Moves the paper backward by 1/108 inch per step.

Pressing FONT along with PAUSE or PAPER FEED lets you micro-adjust the following positions:

● the loading position, immediately after paper is loaded in the printer.

● the tear-off position, when paper has been advanced for tear off.

● the current print position.

The adjusted loading and tear-off positions will be stored in non-volatile memory (except for the loading position of cut sheets by manual insertion).

You can end micro feed (or micro adjust) mode by pressing the FONT button again. The printer exits this mode automatically in several seconds if no operation is performed.

Pressing FONT+ PAUSE or FONT+ PAPER FEED switches bins when a double-bin CSF is installed, there is no paper in the paper path, and friction feed is selected.

IFONTl+[pApER

FEED]

Ejects a cut sheet forward or feeds continuous paper backward to the paper park position.

1.4.3 Indicators

<READY>

Ready to print :

Tear-off :

Pause : Paper error :

Head hot :

<FONT>

Draft :

NLQ

Roman :

NLQ

Saris serif:

Normal pitch : Condensed pitch : ON

Blinking

(ls~o

duty) Blinking (50% duty) Blinking Blinking

(25’Yo (25Y0

duty)

OFF ON

Blinking

OFF

When an error occurs, the READY, FONT, and CONDENSED LEDs will be used in combination to identify the

error.

All indicators blink simultaneously: Fatal error All indicators blink sequentially in the clockwise direction: Voltage error

1-19

Page 29

REV.-A

1.5 Functions

1.5.1 Default Settings

Users can set certain default parameters, which will be used at printer initialization.

To change the parameters shown in Table 1-16, Group 1 Features, follow the steps below.

Turn on the printer while pressing the FONT button. Then, the current default settings will be printed on

the paper loaded in the paper path.

LEDs

Press the FONT button to select a parameter. The FONT and CONDENSED

2. show the current parameter selected. Press the FONT button as many times as necessary to make the

LEDs

indicate the setting you want. (See Table 1-16.)

Press the PAUSE button to change the setting. The READY LED shows your selection.

turn on, off, or blink to

.!.

,,. ,

Repeat this procedure for any Group 1 feature you want to change. (After you have set the feature at the

bottom of Table 1-16, the printer returns to the first feature in Table 1-16.)

When all the settings are as you want them, turn off the printer. The settings will be stored in non-volatile

memory.

To change the settings shown in Table 1-17, Group 2 Features (IBM mode), follow the steps below.

Turn on the printer while pressing the FONT and PAUSE buttons. Then, the current CG table for either

ESC/P

or IBM mode will be printed on the paper loaded in the paper path.

Press the FONT button to select the character table. The FONT, CONDENSED, and READY

2. off, or blink to show your selection. Press the FONT button as many times as necessary until the FONT,

LEDs

CONDENSED, and READY

Turn off the printer. The settings will be stored in non-volatile memory.

indicate the character set you want.

(ESC/P

mode), or in Table 1-18, Group 2 Features

LEDs

turn on,

1-20

Page 30

I ault$

I -

Iu. -g uup m rcacul ca

REV.-A

FONT

LED OFF

COND.

LED

Feature

Emulation

Setting

ESC/P

IBM Proprinter

OFF BLINKS

Character pitch

Pica OFF Elite ON

OFF

Page length 11 inch

12 inch ON

8.5 inch

70/6 inch (A4)

BLINKS

Skip over perforation

No skip Skip 1 inch ON

BLINKS OFF

Zero face

BLINKS ON

BLINKS BLINKS

Note: The factory setting is that the READY LED is OFF for all features.

Auto tear-off Valid

Invalid

Auto LF with CR Depends on l/F

Valid

READY

LED

OFF

OFF ON OFF

OFF ON OFF ON OFF ON

1-21

Page 31

REV.-A

Table 1

FONT

LED

OFF I ON

OFF

OFF OFF OFF OFF

ON ON OFF ON ON ON ON

ON ON

BLINKS I OFF

BLINKS BLINKS BLINKS

COND.

LED

ON BLINKS BLINKS BLINKS

OFF

BLINKS OFF BLINKS BLINKS

ON ON ON

7. Group 2 Features

READY

LED

BLINKS

OFF

BLINKS

OFF

BLINKS

OFF

BLINKS

OFF

BLINKS

OFF

BLINKS

OFF

BLINKS

Italic

Character table

(ESC/P

Mode)

table

U. S. A.(std. setting) France Germany U.K. Denmark Sweden Italy Spain

PC437

PC850 PC860 PC863 PC865 PC437

Greek

PC851 PC869 PC852 PC853

PC857 PC855 PC866

GOST

PC861

Note: The CG tables between ‘PC437 Greek’ and

CG table of PC

ESC tl

Then

Notes: 1) For table 1, codes

For table 2, codes

2) The CG tables memory.

XXX is selected, the table is assigned as the table selected by the

and

ESC

6 are set as defaults. (Codes

Table 1-18. Group 2 Features (IBM Mode)

FONT

LED OFF OFF OFF OFF OFF ON

COND.

LED

OFF

80-9FH

for ESC/P mode and IBM mode are saved independently in non-volatile

are control codes.

READY

LED

BLINKS

OFF

are printable characters.

‘PC861’

are available only for European models. When the

80-9FH

Character table

(ESC

1-22

are printable characters.)

CG table

PC437

(table 1) (std.)

PC437

(table 2)

PC865

(table 1)

PC865

(table 2)

7 is set.)

(ESC

6 is set. )

ESC

tl command.

Page 32

REV.-A

1.5.2 Power On Default Settings

The printer also lets you change some of its power on parameters. To change the settings shown in Table 1-

19, Group 3 Features (Power on settings), follow the steps below.

1. Turn on the printer while pressing the PAUSE, PAPER FEED, and FONT buttons.

2. Press the button indicated in Table 1-19 for a few seconds to change parameters.

Table 1-19. Group 3 Features (Power-on Settings)

Button

[PAUSE] [PAPER FEEDI

[FONT]

Notes: 1) Auto CR moves the next print position to the left margin when LF or ESC J code is sent.

2) ‘*’ is one beep, and ‘**’ is two beeps. If no operation is executed within a few seconds, the printer exits the power on selection mode with

five beeps (*****).

The selected value is stored in non-volatile memory.

* The printer automatically becomes ready to print after the selection.

1.5.3

1.5.4

Buffer-full Printing

Hexadecimal Dump

Feature Input buffer Draft printing speed

Auto CR

valid (**) or invalid (*)

high (**) or normal (*)

valid (**) or invalid (*)

standard setting

Setting

Press the PAUSE button while turning on the printer to put the printer in hexadecimal dump mode. In this

mode, received data is printed out in hexadecimal format, along with the corresponding ASCII characters. This function is useful to check received data from the host. If a received code is not a printable the printer prints a period (.) in the ASCII column.

Figure 1-8. Hexadecimal Dump Printout

1-23

ASCll

character,

Page 33

REV.-A

1.5.5 Self Test

Press the PAPER FEED button while turning on the printer to put the printer in self-test mode. To stop the self

test, turn off the printer. (The control panel is still operational in self-test mode for paper handling and font

CSF,

selection. ) When pages are printed from the the maximum number of printable lines is printed in the bottom line of the sheet and saved in non-volatile

memory as the default page length. Page lengths are saved individually when a dual bin

The self test prints out the following:

(a) Maximum printable lines (only on cut sheets from the (b) Firmware version

below.

the first sheet is used for scaling the sheet length. Then,

CSF

is in use.

CSF)

Figure 1-9. Self Test Printout

1.5.6 Paper-out Detection

When the paper-out sensor detects a paper out, the printer enters the pause condition automatically after feeding or printing several lines. When a paper-out is detected, load new paper properly and set the printer

ready to print by pressing

Auto Tear-off

1.5.7

When the release lever is set to one of the tractor positions, the paper advances to the tear-off position

automatically if the input data buffer is empty and the paper is at the top-of-form position (If the printer receives no additional data after it has received a form feed). If subsequent data is sent to the printer, the paper reverse feeds to the original position automatically and the printing starts. This function can be turned off in

the default setting mode.

1.5.8 Thermal Protection

When the printhead temperature exceeds 82 deg. C, the printer stops printing to protect the printer from

overheating.

the PAUSE button.

a.,

{ “

>,.,

..-”

1.5.9 High Duty Printing

the

The printer stops printing when

printer continues printing the rest at half speed.

printing duty is

too heavy

1-24

for the

printer’s power

supply. If it occurs, the

:“

Page 34

, 1.5.10 Sheet Loading and Sheet Ejection

The release lever engages or disengages the push-tractor unit drive mechanism. The lever’s operation provides with improved paper-handling functions:

(a) Automatic cut sheet loading without the cut sheet feeder

REV.-A

Move the release A few seconds later, the sheet is automatically loaded to the top-of-form position, and the printer becomes

ready to print.

(b) Automatic cut sheet loading and ejection with the cut sheet feeder

Move the release lever to the FRICTION position and load a stack of paper into the hopper of the cut sheet

feeder. Pressing the PAPER FEED button loads the sheet to the top-of-form position. If a paper-out is detected

before printing starts, the sheet is automatically loaded to the top-of-form position, without the PAPER FEED

button being pressed.

(c)

Continuous paper loading and ejection (paper park)

Move the release lever to REAR PUSH/FRONT PUSH position and load the paper into the tractor unit. Press

the PAPER FEED button to load the paper automatically to the top-of-form position. If a paper-out is detected

before printing starts, the paper is automatically loaded to the top-of-form position, without the PAPER FEED button being pressed. If the FONT+ PAPER FEED buttons are pressed when the continuous paper is loaded, the paper is ejected backward to the paper park position. To feed several pages backward, repeat this operation several times.

Ievertothe

FRICTION position and load a sheet using the paper guide (top or optional front).

1.5.11 Adjust Lever Operation

The platen gap adjust lever must be set to the proper position (from the 8 step available) for the paper

thickness.lf this lever is set to the position 2 (4th step) or higher, printing speed and paper feeding speed will

be reduced.

Table 1-20. Lever Positions

Lever position Paper thickness

O (2nd step) 1 (3rd step)

Note: If printing density becomes lighter, move the platen gap adjust lever position one step closer.

2 (4th step) 3 (5th step)

0.06-0.12 mm

0.13-0.17 mm

0.18-0.25 mm

0.26-0.32 mm

1-25

Page 35

REV.-A

-=.

Position 1 (3rd step)

. .

r’

Platen Gap Adjust Lever

&’”

Figure 1-10. Lever Positions

1.5.12 Printer Initialization

The printer is initialized in the following cases.

(1) When the printer is turned on.

(2) When the

When the printer is initialized, it performs the following functions:

● The printhead returns to the leftmost position (carriage home).

● The READY LED lights.

● The printer clears the print buffer and input data buffer.

● The line spacing is set to 1/6 inch.

● The page length and skip over perforation settings are returned to their default values.

● All vertical tab positions are cleared.

● The horizontal tab positions are set to every 8 columns.

● The print mode is set to the default value set from the control paneI and stored in non-volatile memory.

INIT

signal

CMREQ

(optional l/F ) is input.

4.-

TOF position will be reset in the following cases.

(1) Power on

(2)

INIT

signal or CMREQ (optional I/F)

(3) Sofiware reSet command (4) Page length command

NOTE: The

CMREQ

system.

signal goes

(ESC @)

(ESC

Low

when the command request is sent from the

1-26

optional card to

the main

Page 36

REV.-A

1.5.13 Buzzer

The buzzer beeps for 0.1 second at a time. These beep sounds a recombined in various ways, as shown below, to indicate different meanings.

In the following table, each “*” stands for one beep.

Table 1-21. Buzzer Functions

Status

BEL

code

Carriage trouble

Voltage error

Fatal error

Incorrect memory

Paper error

Illegal paper release/u nrelease

Recognition of operation

Sound and Description

BEL

Sounds when a

code has been input.

*** ***

An error has occurred with the carriage position.

No beeps. (Shown by indicators blinking sequentially in the clockwise direction.)

No beeps. (Shown by indicators blinking simultaneously.)

** ** ** **

**** **** **** ****

— RAM

PROM

— E

****

Continuous paper has run out.

CSF

Cut sheet paper from the

has run out. No paper was present at the start of a self test. A sheet could not be ejected from the

CSF.

*** Other paper detection error have occurred.

With single sheet feed selected, no paper is present. Continuous paper can’t be loaded.

Paper

runs out after the PAPER FEED button has been

messed.

***** ***** *****... (continuously till corrected)

The release lever has been changed while there was paper in the paper

path. Change the lever again or remove the paper in the path to stop the sound.

* Power-on operation (self test, hex dump, default setting, power-on

selection)

CSF

bin-1 selected.

Micro feed

CSF

bin-2 selected.

* The adjusted value set using micro feed is the same as the factory setting

value (loading position or tear-off position). ***** ***** *****... (continuously until button is released)

The micro feed value has reached its upper or lower limit.

1-27

Page 37

REV.-A

1.6 Main Components

The components of the and repair. The main components are:

BOARD ASSEMBLY,

(1)

BOARD ASSEMBLY,

(2)

BOARD ASSEMBLY, C076

(3)

Printer Mechanism

(4)

Housing Assembly

(5)

The following figure shows the main components of the FX-870/l 170.

Platen

FX-870/l 170 are

C094

MAIN

C094

PNL

PSB/PSE

designed for easy

removal

and replacement during maintenance

.::,

f’

Pril

f-::

-..

PSB/PSE

C094

AIN

Figure 1-11. Main Components

1-28

”

Page 38

REV.-A

q.6.I BOARD ASSEMBLY,

Basically, the same board layout is used in both the 136-column model and the 80-column model. The CPU on this board controls all the main functions of the printer. E05A55YA gate array, an

CR MOTOR

~~~f~4M

HEAD DRIVE

TRANSISTOR . .

C094

E2PROM,

PF MOTOR DRIVER

LPAI 476H

MAIN (Main Control Circuit Board)

It consists of a

a PSRAM, a MASK ROM, motor drivers, and head drive transistors.

,,,,,

CPU TM

P90C041F

\’

Ill 1

— —

Cl”lp

——

CENTRONICS l/F

“

~—

/ I +7

TMP90C041F 8-bit CPU, an

E2PROM

“

*PS

RAM

”MASK

‘

;~-

CN2

for OPTION

T/ “

<136-column model>

PF MOTOR DRIVER

pPA1476H

CR MOTOR

g;!f;24M

?r-

HEAD DRIVE

TRANSISTOR

r~;--o’”

,(0

0: n:

0’

CPU

TM P90C041F

GATE ARRAY

E05A66YA

\//

–y

‘~

GATE ARRAY

E05A66YA

CENTRONICS l/F

qE2pR0M

,PS

“

‘

RAM

MASK ROM

CN2

for OPTION

l/F

c80-column model>

Figure 1-12. BOARD ASSEMBLY,

C094

MAIN (Main Control

1-29

Circuit

B-d

Page 39

REV.-A

1.6.2 BOARD ASSEMBLY, C094

This board functions as the control panel of the switches, and three indicator LEDs.

Figure 1-13. BOARD ASSEMBLY,

PNL

(Control Panel Circuit Board)

FX-870/l

C094 PNL

170, and consists of a power switch, three function

(Control Panel Circuit Board)

K’.

*“

1.6.3 BOARD ASSEMBLY,

This board is composed of an input filter circuit, a transforming circuit, a switching regulator circuit, a

rectifying circuit, a smoothing circuit, and various protecting circuits.

C076 PSB/PSE

(Power Supply Circuit Board)

,.~..

f..;

Figure 1-14. BOARD ASSEMBLY,

C076 PSB/PSE

(Power Supply Circuit Board)

1-30

Page 40

REV.-A

1.6.4 Printer Mechanism

The printer mechanism consists of a 9-pin impact dot head, a carriage mechanism, a carriage motor, a paPer feed mechanism, a paper feed motor, a ribbon feed mechanism, and various sensors.

<136-column

<80-column model>

Figure 1-15. Printer Mechanism

1-31

Page 41

REV.-A

1.6.5 Housing Assembly

The printer mechanism and all the boards are contained in a housing assembly that consists of the uppercase

and the lower case.

Printe

Upper

Lower

Front Co

Figure 1-16. Housing Assembly

.-,. .

{’

:..:;

,..

1-32

Page 42

CHAPTER 2

OPERATION PRINCIPLES

REV.-A

2.1 Printer

2.2 Power

2.3

Control Circuit Operation

Mechanism Operation

Printhead

2.1.1 Carriage Mechanism

2.1.2

Platen Gap Adjustment

2.1.3

Paper Handling Mechanisms

2.1.4

2.1.4.1 Paper Feed Mechanisms

2.1.4.2 Paper Advance Mechanisms

2.1.4.3 Paper Paths

Ribbon Advance Mechanism

2.1.4 Supply Operation

Power Supply Overview

2.2.1

Power Supply Circuit Operation

2.2.2

Control Circuit Operation Overview

2.3.1 Reset Circuit

2.3.2

Sensor Circuits

2.3.3 Carriage Motor Drive Circuit

2.3.4 Paper Feed Motor Drive Circuit

2.3.5

Printhead

2.3.6 Parallel Interface Circuit

2.3.7

E2pRoM Control circuit

2.3.8

Mechanism

Drive Circuit

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1 2-1 2-3 2-4

2-5 2-5

2-6 2-13 2-18

2-19 2-19 2-20 2-22

2-22 2-25 2-26 2-27

2-28 2-23 2-29

2-30

Z.i

Page 43

REV.-A

LIST OF FIGURES

Figure 2-l. Howthe

Figure 2-2. Carriage Operation . . . . . . . . . . . . . . . . . . .

Figure 2-3. Platen Gap Adjust Lever

Figure 2-4. Friction Advance Operation UsingtheTop Paper Entrance ...........2-6

Figure 2-5. Push Tractor Operation Using the Rear Paper Entrance .................2-7

Figure 2-6. Push Tractor Operation Using the Front Paper Entrance ................2-8

Figure 2-7. Pull Tractor Operation Using the Bottom Paper Entrance ..............2-9

Figure 2-8. Push-Pull Tractor Operation Using the Rear Paper Entrance

Figure 2-9. Push-pull Tractor Operation Using the Front Paper Entrance ......2-11

Figure 2-10. Release Lever Figure 2-11. Release Lever Setting Function

Figure 2-12. Paper Path for Friction Feeding Using the Top Entrance ............2-13

Figure 2-13. Paper Path for Push Tractor Feeding

Ftgure

2-14. Paper Path for Pull Tractor Feeding Using the Rear Entrance ....2-14

figure

2-15. Paper Path for push-pull Tractor Feeding Using the Rear Entrance .....2-15

Figure 2-16. Paper Path for Pull Tractor Feeding Using the Bottom Entrance .........2-15

Figure 2-17. Paper Path for Friction Feeding Using the Front Entrance Figure 2-18. Paper Path for Push Tractor

figure

2-19. Paper Path for Pull Tractor Feeding Using the Front Entrance ...2-17 Figure 2-20. Paper Path for Push-pull Tractor Feeding Using the Front Figure 2-21. Ribbon Advance Mechanism Figure 2-22. Power Supply Circuit Block Diagram Figure 2-23. Control Circuit Block Diagram

figure

2-24. Data flow

figure

2-25. Power On Reset Circuit

figure

2-26. Sensor Circuit Block Diagram Figure 2-27. Carriage Motor Drive Circuit Figure 2-28. Paper Feed Motor Drive Circuit Figure 2-29. Figure 2-30. Parallel Interface Circuit Figure 2-31. E2PROM Control Circuit

Printhead

Drive Circuit

Works

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

.~.--........-..-..

--~...f~~.~~..~.~~.-.----~~..-

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Uskg

l%eding Ueingthe

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

............................2-2

2-3

2-4

........2-lO

2-12 2-12

the Rear

Front

EntTence............2-l4

..........2-l6

En&ance

. . . . . . . . . . . . . . . . . . . . . . . . . . .

..........2-16

Entrence....2-l7

2-18 2-21 2-22 2-23 2-25 2-26 2-27 2-28 2-29 2-29 2-30

.’%

c’

...4

LIST OF TABLES

Table 2-1. Paper Feed Methods and Paper Entrances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 2-2. Ribbon Advance Gear Linkage Table 2-3. Power Supply Input Voltages and Fuse Ratings

Table 2-4. Power Supply Output Voltages and Applications ...........................2-19

Table 2-5. Functions of Main Components of C094 MAIN Table 2-6. Carriage Motor Drive Modes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

................................2-24

.............................................................2.27

Z.ii

2-5 2-18 2-19

Page 44

2.1 Printer Mechanism Operation

REV.-A

This section describes the printer mechanism of the

FX-870/l

The

parts: 1) the

4) the ribbon advance mechanism. Each of these is described below.

170 printer mechanism features a 9-pin impact dot printhead for

printhead mechanism, 2) the carriage movement mechanism, 3) the paper feed mechanism, and

FX-870/l

170 printer and explains how the printer works.

seriaI

Printin9. It has four main

2.1.1 Printhead Mechanism

The

printhead

a column of 9 wires. Each of these wires has a drive coil which causes the wire to move in and out of the

printhead to print each dot. The four steps below describe how these driving wires work.

(1) The control

voltage, and current flows through the corresponding generates a magnetic force.

Thisinducedforce causesthe plate toapproach the coil rod andtheassociated dotwire is rapidly ejected

(2)

to impact on the platen.

(3) The dot wire presses the ink ribbon up against the paper as it hits the platen and in this way prints a dot

on the paper.

mechanism consists of the

circuit

outputs drive signals to the printhead drive circuit. This changes the printhead drive

printhead

itself, the ink ribbon, and the platen. The printhead contains

printhead

coil. The coil acts as a solenoid and

(4 As

soon as the current through the coil is switched off, the force induced in the coil rod stops. The plate then returns to its original position (the position assumed before the coil was energized) through the action of the plate spring. After the dot wire hits the platen, the rebounding force of hitting the platen works with the wire resetting spring to pull the wire back to its original position.

2-1

Page 45

REV.-A

Figure 2-1 shows the action of the printer mechanism when a single dot is printed.

Ribbon

Mask

Wire Resetting Spring

Stopper

\ \

.ctuatlngT:-Rbf)cl

B$l=lieaclDrivingCOil

Actuating Plate Spring

Dot

Wire

Paper

Platen

.-.

---

“

Figure 2-1. How the

The

printhead

overheating, the head is equipped with a thermistor that can detect the head temperature. When the thermistor detects changes in the voltage change and stops printing until the head temperature cools.

The

printhead

of 1.5 KHZ for 40 a buzzer.

tends to heat up after a period of continuous printing. To minimize the dot wire drive coil

printhead

is also used asa buzzer. Head driving coils move

I.M

without impacting the platen, so that the wires vibrate. The vibrating dot wires sound like

temperature, the voltage signal changes. The CPU detects the

Printhead

Works

allthedotwires

backandforth atafrequency

-.,, .=:

{

2-2

-.. ,.

Page 46

REV.-A

‘

2.1.2 Carriage Mechanism

The timing belt is connected to the lower side of the carriage. With the printhead installed, the carriage moves

either direction along the carriage guide shaft. The carriage (CR)motor (a stepping motor) drives the

belt which moves the carriage. The home position (HP) sensor detects the home position of the carriage.

timin9

NOTE: Carriage initialization for the

Timing Belt

Puny

‘etec’Or’Hp

>\\!!!

Base Frame

80-coIumn and 136-column models are different.

“~d

‘\

\\-\@/A

Figure 2-2. Carriage Operation

2-3

Page 47

REV.-A

2.1.3 Platen Gap Adjustment

Theplatengap (the gap between the platen andtheprinthead) can beadjustedto allowthe printerto use paper

of differentweights guide shaft rotates. This rotation moves the carriage either toward or away from the platen and changes the platen gap. Setting the adjust lever to position 2 (the 5th slot from the top) turns off the platen gap switch, which slows down the printing speed of the printerto protect the of the adjust lever. The correct platen gap is 0.38mm * 0.02mm with the adjust lever set to position O.

orthicknesses.

Platen Gap Adjustment Slot

When the platen gap adjust lever is moved forward or backward, the carriage

~m,

.::,

printhead.

The PG detector detects the position

Printhead

&>.,

----

4“

Detector, PG

Figure 2-3. Platen Gap Adjust Lever

Lever, G, Adjust

2-4

“.. . . .

Page 48

REV.-A

2.1.4 Paper Handling Mechanisms

During normal operation, the paper is fed to the printer, advanced to the specified position, and ejected from the printer. These paper handling operations are performed by various paper handling mechanisms, such as the tractors, platens, rollers, and gears. This section describes the printer’s paper handling mechanisms.

2.1.4.1 Paper Feed Mechanisms

Cut sheets are fed by friction. Continuous paper is fed by a tractor. There are three ways to feed paper with tractors: the push tractor method, the pull tractor method, and the push-pull tractor method. During normal

operation, the printer is set up with only one tractor, which functions as either a push or a pull tractor,

depending on where it is attached on the printer. To use the push-pull tractor feed method, an optional tractor

must be attached.

There are four paper entrances for feeding paper into the printer. Different paper entrances are used for

different types of paper. Table 2-1 lists which paper entrances can be used with each paper feed method.

Table 2-1. Paper Feed Methods and Paper Entrances

Paper Feed Method

Friction

Push Tractor

Pull Tractor

Push-pull Tractor

Paper Entrance

Rear

OK OK

Front

Bottom

No No

OK OK OK

OK OK

No No

Top

2-5

Page 49

REV.-A

2.1.4.2 Paper Advance Mechanisms

This section describes how the friction advance and tractor advance mechanisms work to advance the PaPer . . .

-,,

through the printer.

(1)

Friction Advance Method

The paper is held between the platen and paper guide rollers and between the paper tension roller and paper tension unit cover. The PF motor pinion gear, turning in the direction of the black arrow, drives the paper advance reduction gear. The paper advance reduction gear turns the platen gear and the paper tension roller gear. The paper advances in the direction of the white arrow. Figure 2-4 illustrates the friction advance method when the paper is fed through the top paper entrance.

In the friction advance method, the paper guide roller spring holds the paper against the platen. You can release this pressure and free the paper by setting the release lever to the tractor feed position.

i-.

Paper (Cut Sheet)

Paper Advance Reduction Gear

~otor,

Figure 2-4. Friction Advance Operation Using the Top Paper Entrance

2-6

Page 50

REV.-A

(2)

push Tractor Method

When the push tractor method is used with the rear entrance, the torque generated by the PF motor is transmitted to the push tractor gear through the PF motor pinion gear, paper advance reduction gear, and tractor reduction gear. When the PF motor pinion gear turns in the direction of the black arrow,

rotates in the direction of the black arrow and thus feeds the paper into the printer. The paper is advanced by the platen and the paper tension roller, which are also driven by the PF motor through the train of gears.

When the push tractor method is used with the front entrance, the torque generated by the PF motor is transmitted to the push tractor gear through the PF motor pinion gear, paper advance reduction gear, platen

pan

gear, and the train of gears in the front of the black arrow, the tractor gear rotates in the direction of the black arrow and thus feeds the paper into the printer. The paper is advanced by the paper drive roller and the platen, which are also driven by the PF

motor through the train of gears.

In the push tractor method, the release lever issetto one ofthetractor positions to release the pressure between the paper advance roller and the platen, Figure 2-5 illustrates push tractor operation when the paper is fed through the rear paper entrance. Figure 2-6 illustrates push tractor operation when the paper is fed through the front paper entrance.

of the printer. When the PF motor pinion gear turns in the direction

thetractorgear

Paper

Ten

Paper (Continuous)

\\b./

‘7perTensi0nR0”er

\Lu-

~(~~~

$aper Advance

Reduction Gear

Push Tractor

~> Tractor Gear

~/A Tractor Reduction G

,pFMotor

Pinion

‘w’

Motor, PF

ear

Gear

Figure 2-5. Push Tractor Operation Using the Rear Paper Entrance

2-7

Page 51

REV.-A

Paper (Continuous)

&\ \

Push Tractor

Figure 2-6. Push Tractor Operation Using the Front Paper Entrance

Push Tractor Gear

/RollerGe~~

Paper Advance Reduction Gear

Drive Roller Gear

Motor,

2-8

. ,.-

-..

Page 52

REV.-A

(3)

pull

Tractor Method

The pull tractor advances paper in basically the same way as the push tractor. The push tractor is installed

at the paper entrance and pushes the paper into the printer mechanism. The pull tractor, however, is installed at the paper exit and pulls the paper out of the printer mechanism. As the result, the paper tension unit is not

required.

Figure 2-7 illustrates pull tractor operation when the paper is fed through the bottom paper entrance.

Paper (Continuous)

Pull Tractor

Paper Drive

/-’’+”

(?(\

Paper Drive

Rolle;Gear

\~[~-

~ull

///”

ML=*

/Reduction Gear

Platen Gear

Tractor Gear

Tractor

Motor, PF

Paper Advance Reduction Gear

Figure 2-7. Pull Tractor Operation Using the Bottom Paper Entrance

2-9

Page 53

REV.-A

(4)

push-pull

The push-pull tractor method is a combination of the push and pull tractor methods. Two tractors are used to advance the paper: one at the front paper entrance and the other at the rear paper entrance. They operate

simultaneously to push and pull the paper through the printer mechanism. Figure 2-8 illustrates push-pull

tractor operation when the paper is fed through the rear paper entrance. Figure 2-9 illustrates push-pull tractor

operation when the paper is fed through the front entrance.

Tractor Method

~./

v’

Paper (Continuous)

?;;:?=:::

. . . . . .

./\

,:::,,,,,,

‘.

Pull Tractor

Push Tractor

Yii!ifx,pushTractorGear

Tractor Reduction Gear

i-.

.’

Pul

Paper Advance Reduction Gear

Figure 2-8. Push-Pull Tractor Operation Using the Rear Paper Entrance

PF Motor Pinion Gear

klotor,

2-1o

Page 54

REV.-A

Paper (Continuous)

Paper Drive Roller

Pull Tractor

Pull Tractor Gear

Tractor Reduction Gear

PF Motor Pinion Gear

.’

~..

Motor, PF

Paper Advance Reduction Gear

Platen Gear

—

‘.

Paper Drive Roller Gear

Push Tractor Gear

Push Tractor

Figure 2-9. Push-pull Tractor Operation Using the Front Paper Entrance

2-11

Page 55

REV.-A

(5) Release Lever

The release lever is used to select friction or tractor feeding or release the paper. When the release lever is

set to the friction feed position, the paper guide rollers are pressed against the platen. When it is set to one of the tractor feed positions, this pressure is released and the paper guide rollers are separated from the

platen. When it is set to the paper free position, the paper drive roller and the lower paper guide roller at the front entrance are separated from each other. Figure 2-10 illustrates the release lever. Figure 2-11 shows the function of each release lever setting.

Paper

Right

Frame

.;.-

..-

Release Lever

Release Shaft

Figure 2-10. Release Lever

Friction Feed (Front, Top)

cl!

-!!

cl I

‘K

Pull Tractor (Front, Rear)

‘

Paper Free

Detector, RELEASE

Push Tractor (Front)

(Bottom) Push-Pull Tractor (Front)

Push Tractor (Rear)

(Bottom) Push-Pull Tractor (Rear)

,-..

t ~

.,. -

‘j

Figure 2-11. Release Lever

2-12

Setting Functions

Page 56

REV.-A

2.1.4.3 Paper Paths This section describes the various paths the paper follows through the printer mechanism. The various paper

paths are divided into four groups depending on the entrance

(toPt rear, bottomf

or front) the PaPer is fed

from”

Note: The front PE (paper-end) detector is located in front of the printer mechanism and the rear PE detector is located behind the printer mechanism.

(1) Top entrance

Figure 2-12 shows the paper path for friction feeding using the top entrance. The top entrance is used only for friction feed method. When the top entrance is used, the rear PE detector senses when the paper is out.

Paper (Cut Sheet)

Paper Tension Roller

Detector, PE (Rear)

Paper Guide Rollers

Figure 2-12. Paper Path for Friction Feeding Using the Top Entrance

2-13

Page 57

REV.-A

(2) Rear entrance

Figures 2-13 and 2-14 show the paper paths fortractorfeeding using the rear entrance. The rear entrance can be used with any of the following paper feed methods: the push tractor feed method, the pull tractor feed method, or the push-pull tractor feed method. When the rear entrance is used, the rear PE detector senses

when the paper is out.

Paper (Continuous)

Paper Tension Roller

Push Tractor

Detector, PE (Rear)

~~:.,

Paper Guide Rollers

Figure 2-13. Paper Path for Push Tractor Feeding Using the Rear Entrance

Paper (Continuous)

Printhead

Detector, PE (Rear)

Paper Guide Rollers

Figure 2-14. Paper Path for Pull Tractor Feeding Using the Rear Entrance

2-14

Page 58

REV.-A

Paper

(Continu

Printhead

ctor

ear)

Paper Guide Rollers

Figure 2-15. Paper Path for Push-pull Tractor Feeding Using the Rear Entrance

(3) Bottom entrance

Figure 2-16 shows the paper path fortractorfeeding using the bottom entrance. The bottom entrance is used only for pull tractor feeding. When the bottom entrance is used, the front PE detector senses when the paper is out.

Paper (Continuous)

Paper

Detector, PE (Front)

Lower Paper Guide Roller

Figure 2-16. Paper Path for Pull Tractor Feeding Using the Bottom Entrance

2-15

Page 59

REV.-A

(4) Front entrance

Figures 2-17 through 2-20 show the paper paths for the front entrance. The front entrance can be used with any of the following paper feed methods: the friction feed method, push tractor feed method, pull tractor feed method, or push-pull tractor feed method. When the front entrance is used, the front PE detector senses when

the paper is out.

Paper Tension Roller

Paper

Paper (Continuous)

Pri

‘nthead

Roller

Drive

~:>1

-..

Detector, PE (Front)

Figure 2-17. Paper Path for Friction Feeding Using the Front Entrance

Paper (Continuous)

..,,%:.

Paper

. .

XmJ

L-J\

Detector, PE (Front)

Lower Paper Guide Roller

.:,..$j~

—

Paper Tension Roller

,Platen

Lower Paper Guide Roller

Push Tractor

~.-.,

-.. .. .

Figure 2-18. Paper Path for Push Tractor Feeding Using the Front Entrance

2-16

- . .

Page 60

Paper (Continuous)

Paper Drive Roller

Detector, PE (Front) \

REV.-A

. .

Lower Paper Guide Roller

Figure 2-19. Paper Path for Pull Tractor Feeding Using the Front Entrance

Paper (Continuous)

Paper Drive Roller

Lower Paper Guide Roller

Detector, PE (Front)

Push Tractor

Figure 2-20. Paper Path for Push-pull Tractor Feeding Using the Front Entrance

2-17

Page 61

REV.-A

2.1.4 Ribbon Advance Mechanism The ribbon is held between the ribbon advance roller (ribbon driving gear) and the ribbon pressure roller.

When the carriage moves ontheshaft, the timing belt turns the belt driven pulley, andthetorque is transmitted to the ribbon driving gear through the train of gears. The ribbon driving gear rotates counterclockwise no matter what direction the carriage moves, because the

Table 2-2. Ribbon Advance Gear Linkage

Direction of Carriage Movement

Left to right (indicated by the black arrow)

Right to left (indicated by the white arrow)

The ribbon brake spring, attached to the exit slot of the cartridge case, prevents slack in the ribbon and keeps the ribbon tension at an appropriate level. The ribbon mask prevents the ribbon from brushing against the

paper.

Belt driven pulley ● Gear (1) ● Gear (2) Ribbon driving gear

Belt driven pulley @ Gear (1) O Gear (3) Gear (4)

planetav gear is used in the gear linkage.

Gear Linkage

Ribbon-driving gear

$Y,

i...

‘“”

Ribbon Advance Roller

Ribbon

Pressure

Ribbon

Driving Gear ,

Roller

Gear

Gear (2)

Ink Ribbon

‘-

Mask

Brake

“’

Figure 2-21. Ribbon Advance Mechanism

2-18

Page 62

2.2 Power Supply Operation

REV.-A

The FX-870/l 170 printer is powered by either of the two power supply boards: 120

(BOARD ASSEMBLY, boards output the DC current necessary to drive the printer control circuits and the printer drive mechanism. Fuse F1 (2.5A/125 V for of each board in case of a short circuit.

C076 PSB)

C076 PSB

Table 2-3. Power Supply Input Voltages and Fuse Ratings

I I

or 220/240

or 1.25 lV250 V for

Board

C076 PSB

C076 PSE

VAC

I I

power

103.5-132

SUPPIY

C076 pSE)

Input Voltage

198-264

VAC

board

VAC

(BOARD ASSEMBLY,

is used to Protect the Power

Fuse

2.5

7.25

AJ125

lV250 V

Rating

VAC

power supply board

C076

suPPIY

pSE).

These

circuit

2.2.1 Power Supply Overview

The power supply board has two power output lines that supply power to the control circuits and the drive

mechanisms. Table 2-3 lists the components

two DC voltages.

(pans or assemblies) of the printer that are powered by these

Table 2-4. Power Supply Output Voltages and Applications

Output voltage (DC)

+35

+5 v Main control board logic circuitry

CR (carriage) motor drive

PF (paper feed) motor drive Printhead drive

Sensors Control panel LEDs

PF (paper feed) motor hold

Applications

2-19

Page 63

REV.-A

2.2.2 Power Supply Circuit Operation

Figure 2-22 shows the power supply circuitry in block diagram form. When AC power enters the printer from

an external power source, the filter circuit removes the noise. The AC voltage then undergoes full wave

rectification and is smoothed to produce direct current. The voltage is then fed through the switching circuit

VDC

and the secondary smoothing circuit to produce a stepped down +35

is connected to the switching circuit. This feedback control arrangement ensures a stable +35

supply.

A+5VDCvoltage is generated by feeding the +35 VDCvoltagethrough the the +35

overcurrentiovervoitage control circuits performs this function. It controls the +5

The +5

stops the operation of the switching circuit and then the output of +35

The+35VDC line has a voltage overload protection circuit and a voltage drop protection circuit. The +35VDC

voltage overload protection circuit cuts the +35

operation of the switching circuit and then the output of the +35

circuit protects the printer against a sudden voltage drop that maybe caused by a short circuit in the

circuitry of the +35 then the output of the +35

VDC

is stepped down to a stable +5

VDC

voltage overload protection circuit cuts the +5

VDC

line. If a voltage drop is detected, it stops the operation of the switching circuit and

VDC

voltage.

VDC

voltage. The switching regulator IC containing the

VDC

line output if the voltage exceeds +7

VDC

line output if the voltage exceeds +36

VDC

voltage. A +35

+5VDC

VDC

voltage. The voltage drop protection

power supply circuit, where

voltage.

VDC

line output.

detector circuit

VDC

voltage

VDC.

It stops the

seconda~

,, :,.

““

An external switch is used to turn the printer power on or off. When the power switch is turned off, the

switching circuit is de-energized and the output of the +35

is in the secondary circuitry, the current continues to flow in the primary circuitry as long as the printer remains

plugged into an external AC power source. For this reason, you must disconnect the printer from the external AC power source. Unplug the power cable from the AC power outlet before you perform any maintenance work.

VDC

voltage is stopped. However, since the switch

f’

., .

2-20

Page 64

Full Wave Rectification Circuit

Filter Circuit

AC input

Primary

— Smoothing

Circuit

Switching Circuit

l------

1 I 1 1

I I I 1 I

1 1

t 1 I

Photo-

coupler

I I I I 1

1 1 I 1

Smoothing

; I

Circuit

I 1

1 1

I 1 1 1

Switching Regulator

. . . . . . . . . . . . . . .

+5V

Over Current Control Circuit

----..-.....----

+5V

Over Voltage Control Circuit

+35 V Line

Detector Circuit

Secondary

ZD51

REV.-A

4 +35

VDC

+5 VDC

Photo-

coupler

1 1 1 1 I 1 1 1 1 1 I I t t I I I I I I I I 1 I I I I 1 t 1 1 1 1

—

{

+5 V Line Voltage

Overload Protection Circuit

+35 V Line Voltage Drop Protection Circuit

ZD53

—

Switch

Figure 2-22. Power Supply Circuit Block Diagram

2-21

Page 65

REV.-A

2.3 Control Circuit Operation

The control circuit consists of two circuit boards: the

PNL (the control panel circuit board). This section describes the operation of these boards.

2.3.1 Control Circuit Operation Overview

The CPU on the C094 MAIN is the 8-bit TM

components of the printer. The E05A66YA gate array contains various memory management functions that control the memory assignment and input

poti

of the CPU. The signals from the control panel are sent to the gate array, which in turn sends LED

signals to the control panel. The two motors (CR and PF) are controlled by signals sent from the stepping

motor control port of the CPU. Figure 2-23 shows the control circuits in block diagram form.

ETROM

BIT

5C1

P90C041F

1/0

areas. The output signals from each detector are sent to the analog

C094

MAIN (the main control circuit board) and the

microprocessor (9.83 MHz). It oversees control of all the

C094

CONTROL PANEL

BUITONS

AND LEDS

WE-1

+5vDc

+35vDc

PG SENSOR

PE FRONT SENSOR

PE REAR SENSOR

k-~

)

RELEASE LEVER

SENSOR

Data bus

Addrt?ss

—

HOME

SENSOR

HEAD THERMISTOR

bus

Figure 2-23. Control Circuit Block Diagram

2-22

Page 66

REV.-A

Figure 2-24 shows the data flow from the host computer to the

is converted to image data and transmitted to the

CPU

El-

Print data

conversion

Image data transfer

printhead

through the gate array.

-1

-L

printhead.

Input

buffer

Data sent from the host computer

---------

Image

buffer

Figure 2-24.

Data Flow

2-23

Page 67

REV.-A

Table 2-4 lists the functions of the main components of the

Table 2-5. Functions of Main Components of

or Circuit

TMP90C041F

(2C1)

Receives data from the host computer and loads it to the input buffer in RAM. Expands the input data held in the buffer to create image data. Loads the image data to the image buffer in RAM. Transfers the image data to the drive circuit. Also controls various printer mechanism parts, such as the

motors.

E05A66YA

PROM

(IC3)

(IC4)

This gate array mainly performs the following five functions:

“

Memory management

●

Centronics l/F control

● Control panel control

●

E2PROM

●

Printhead

control

drive circuit control

The PROM contains the program that runs the CPU.

C094

MAIN.

Functions

C094

MAIN

printhead

(IC2)

RAM

E2PROM (5CI)

UPA1475H

SLA7024M

(lCl)

(IC5)

The RAM contains the CPU working area and the buffers.

The

EZPROM

is used to store information such as the top-of-form position.

Drive circuit for PF motor

Drive circuit for CR motor

2-24

Page 68

REV.-A

2.3.2 Reset Circuit

The control circuits are initialized when the RESET signal is issued. The reset operation occurs under these two conditions:

(1) Power on reset

Immediately after the power is turned on, +35

voltage at ZD2 to reach +31.5 V, the voltage at the DISC terminal on the gate array does not reach +5

until capacitor delays the output of the ROUT signal. This low level is used as a reset signal.

INIT signal reset

(2)

The reset signal is also issued when the

Figure 2-25 shows the power on reset circuit.

C24

is fully charged. A similar integration circuit is provided in the gate array and further

VDC

is rapidly generated. Because it takes a moment for the

INIT signal is sent from the host computer.

VDC

+35VDC

‘D2~

R80

(IC4)

+5VDC

~R31

RIN

DISC ROUT

55 15

P’-’’--5’

C24

R79

CPU (IC2CI) 15

RESET

Figure 2-25. Power On Reset Circuit

2-25

Page 69

REV.-A

2.3.3 Sensor Circuits The FX-870/l

RELEASE LEVER, and HEAD TEMPERATURE. All the sensors are momentary switches, except the PE (REAR) sensor, which is a photo diode, and the HEAD TEMPERATURE sensor, which is a thermistor.

In addition to the sensor circuits, the +35 V monitor circuit and the monitor circuit is used to set the pulse length of the head drive signal. If the voltage of the +35 V line drops below

+31

to print at a half speed. (The PF motor also slows down.) The for the A/D convertor in the CPU.

The CPU constantly monitors the printhead temperature. If the printhead temperature exceeds the maximum

level, the printer stops printing until the temperature drops to a certain level. When the cools down, the printer resumes printing automatically.

Figure 2-26 shows the sensor circuit block diagram.

170

printer has the following sensors:

V (approx.), the printer stops printing fora while. As soon

CRHOME, pE

Vref circuit is used to supply the reference voltage

(FRONT), pE (REAR), pG (platen

Vref circuit are also provided. The +35 V

asthevoltage

recovers, the printer starts

printhead temperature

(

9ap),

..-.

CPU

(lC)

CRHOME

PEFRONT PEREAR

RELEASE

LEVER

Head Temperature

Figure 2-26. Sensor Circuit Block Diagram

+35

+35 Voltage Monitor

+35

Vref

ZD1

7)7

,., ,.

{. ~

,“

2-26

Page 70

REV.-A

2.3.4 Carriage Motor Drive Circuit

The carriage motor drive circuit controls the CR motor. An open loop, constant current drive arrangement runs the CR motor. 2-2 and 1-2 phases are used to excite the motor. A 2-2 phase step is equivalent to a 1-2 phase step doubled. Table 2-5 describes the motor drive modes.

The CR motor drive circuit of the carriage motor coil. The current flowing through the coil varies depending on the speed of the CR motor. The CPU sets the amount of current via the l/O port of the gate array. Signals are sent to the ports (L, M, HOLD)

on the

The printer may stop printing to protect the CR motor from overheating if a continuous printing of short

columns (less than 10 columns) is repeated.

The printer uses CPU ports

CPU

SLA7024M. The SLA7024M sets the coil current depending on the CR motor speed.

(IC2C1)

P60 P61 P62 P63

E05A66YA

SLA7024M (IC6)

P60

P63

(IC4)

detects and regulates the amount of current flowing in the

exclusively to control the CR motor.

INA

INB CR-A

IN-A

IN-B

CRA

CRB

CR-B

MOTOR ASSEMBLY, CR

r --------- . --.-----,

I 1

I I 8 1

------------------

lqfp-1

[

1 I

I 1

1 I 1 1 A

Data Bus

Speed mode

4/3 9/8

1 5/6 2/3

1/2 5/1

1/4

5/24

1/8

PC4 PC5

PC6

LOW

MIDDLE

HOLD

l-l

Figure 2-27. Carriage Motor Drive Circuit

Table 2-6. Carriage Motor Drive Modes

PPS

4468 3840 3357 2800 2240

1680 1400

840 700 420

Excitation phase

2-2 2-2 2-2 2-2 2-2

1-2

1-2 1-2 1-2 1-2

GiD

CRCOM

4-ph,

200-P HB type pulse motor

35VDC

+8Y0 -7~o

5.4Sh10Y0

Superdraft Superdraft

Draft 10 cpi

4/3 High duty NLQ

5/12 High duty 1/4 High duty

(per phase) (at 25 ‘C)

Characters printed

copy

2-27

Page 71

REV.-A

2.3.5 Paper Feed Motor Drive Circuit

The PF motor (a stepping motor) is used to advance the paper. The minimum advance rate is 1/216 inch. The

motor is a 2-2 phase, constant voltage drive motor. CPU ports Phase data for the PF motor are outputted through these ports.

uPA1476H

When there is an output at A19 of the CPU, a +35 V voltage is supplied to the PFCOM terminal of the PF motor.

Otherwise, a +5 V voltage is supplied through D1 to hold the motor.

CPU

(lCl) depending on the phase data sent from the CPU.

UPA1476H (lCl)

P70 P72 P71

P73

PFAIN

PF&N PFBIN PF~lN

C2 C3 C4

PFA

PF-A :

PFB PF-B

(P70

P73)

are used to control the PF motor.

PFA

PF-B

MOTOR ASSEMBLY, PF

--------

‘

: I

L---------------

‘- ‘

are turned on or off within the

---

‘-‘-;

t t 1 1 1 1 1 1 1 1

---J

-d-

4-ph, 48-p PM type pulse motor

35W)C *1OYO

61(2=3(2

(per phase) (at

“C)

‘3:V

.,,.

Figure 2-28. Paper Feed Motor Drive Circuit

R49

+5V

~“”’

. .

2-28

Page 72

REV.-A

2.3.6 Printhead Drive Circuit

The

printhead

Image data is created in the CPU, transferred to the gate array, and latched to the printhead. The pulse length control signal is set by the CPU. The pulse length is adjusted referring to the voltage of the +35 V line. These two types of signals are sent to the

,35VDC

drive circuit receives two types of signals; image data and the pulse length control signal.

printhead to print each dot. Figure 2-29 shows the printhead drive circuit.

+35VDC

CPU

(IC2C1)

(IC4)

HEAD

DO--7

DO-7

HDP

P51

Q14

P83

HPW

Figure 2-29.

HDN1

HDh9

Printhead

Drive Circuit

Q2,Q4NQ6, Q8,Q9-12

2.3.7 Parallel Interface Circuit

The parallel interface circuit controls the data flow from the host computer. When a STROBE signal is sent from the host computer, the data is latched into the gate array (E05A66YA). Data is transmitted until a BUSY signal is automatically sent back to the host computer to stop the data. Then the gate array outputs an signal to

P82

(the interrupt signal port) of the CPU. The CPU then reads the data latched into the gate array and, on completion of the reading, resets the BUSY signal to enable the host computer to send more data. Figure 2-30 shows the parallel interface circuit.

IBF

Parallel l/F

DO-7

STROBE

BUSY

E05A66YA

DINO-7

STB

-------

(IC4)

DATAO-7

~--------

1 1 1

IBF

---

CPU

DO-7

P82

(IC2C1)

BUSY

Figure 2-30. Parallel Interface Circuit

2-29

Page 73

REV.-A

2.3.8

E2PROM

Figure 2-31 shows the such asthetop-of-form position. Because the data (sent from the host computer) into serial data.

Control Circuit

E2PROM

control circuit. The

E2PROM

is a serial

is non-volatile memory containing information .

1/0

device, the gate array converts the parallel

c’

“4

E2 PROM

([C5C1)

SCL SCK

SDA

Figure 2-31.

E05A66YA (IC4)

SDA

E2PROM

Data Bus

Control Circuit

CPU

(IC2C1)

2-30

Page 74

CHAPTER 3

DISASSEMBLY AND ASSEMBLY

REV.-A

3.1 Overview

3.1.1 Precautions

3.1.2 TooIS

3.1.3 Service Checks After Repair

3.1.4 Screw Specifications

3.2 Disassembly and Assembly

3.2.1 Pre-disessembly Procedures

3.2.2 Removing the PANEL UNIT

3.2.3 Removing the PRINTHEAD

3.2.4 Removing the HOUSING ASSEMBLY, UPPER

3.2.5 Removing the PRINTER MECHANISM

3.2.6 Removing the BOARD ASSEMBLY, C094 MAIN

3.2.7 Removing the BOARD ASSEMBLY, C076

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2.5.1 Removing the PLATEN ASSEMBLY

3.2.5.2 Removing the FRAME ASSEMBLY, REAR

3.2.5.3 Removing the MOTOR ASSEMBLY, CR

3.2.5.4 Removing the MOTOR ASSEMBLY,

3,2.5.5 Disassembling the GEAR

3.2.5.6 Removing the CARRIAGE GUIDE ASSEMBLY .................3-15

3.2.5.7 Removing the Ribbon Drive

3.2.5.8 Removing the Home Position (HP) DETECTOR ................3-18

3.2.5.9 Removing the Platen Gap

3.2.5.10 Removing the Front and Rear Paper End (PE) DETECTORS

3.2.5.11 Removing the DETECTOR, RELEASE

3.2.5.12 Arranging the Cables

3.2.5.13 Disassembling the Tractor Unit

TRAIN, PF

(RD)

ASSEMBLY ..................3-17

(PG)

DETECTOR

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1 3-1

3-1 3-2 3-3 3-4

3-5 3-6 3-7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

........................3-11

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

......................3-18

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . .

PSB/PSE

.....................3-24

. . . . . . . . . .

3-8 3-9

3-1o

3-12

3-13

3-14

3-19 3-20 3-21 3-22 3-23

s-i

Page 75

REV.-A

LIST OF FIGURES

Figure 3-1. Flowchart for Disassembling the Printer

Figure 3-2. Removing the PAPER GUIDE ASSEMBLY .......................................3-5

Figure 3-3. Removing the PANEL UNIT ..............................................................3.6

Figure 3-4. Connecting the FFC Cable to the Panel Unit Figure 3-5. Removing the PRINTHEAD

Figure 3-6. Removing the HOUSING ASSEMBLY, UPPER ................................3-8

Figure 3-7. Removing the PRINTER MECHANISM

figure 3-8. Removing the PIATEN ASSEMBLY

Figure 3-9. Removing the FRAME ASSEMBLY, REAR Figure 3-10. Removing the MOTOR ASSEMBLY, CR Figure 3-11. Positioning the MOTOR ASSEMBLY, CR

Figure 3-12. Removing the MOTOR ASSEMBLY, PF .......................................3-13

Figure 3-13. Disassembling the GEAR TRAIN, PF

Figure 3-14. Positioning the LEVER, RELEASE for Insertion ..........................3-14

Figure 3-15. Removing the CARRIAGE GUIDE ASSEMBLY ............................3-15

Figure

Figure 3-17. Removing the Figure 3-18. Removing the DETECTOR, HP Figure 3-19. Removing the DETECTOR, PG Figure 3-20. Removing the DETECTORS, PE Figure 3-21. Removing the DETECTOR, RELEASE Figure 3-22. Arranging the Cables Figure 3-23. Disassembling the Tractor Unit Figure 3-24. Position of the Cog

Figure 3-25. Removing the BOARD ASSEMBLY, C084 MAIN .........................3-23

Figure 3-26. Removing the BOARD ASSEMBLY, C076

3-16. Attaching the TIMING BELT

ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

....................................3-11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

PSB/PSE ...................3-24

3-4

3-6 3-7

3-9

3-1o

3-12 3-12

3-14

3-16

3-17 3-18 3-18 3-19 3-20 3-21 3-22 3-22

LIST OF TABLES

Table 3-1. Recommended

Table 3-2. Equipment Required for Maintenance Table 3-3. Inspection Checklist for Repaired Printer

Table 3-4. Abbreviations Used for Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..............3-3

Table 3-5. Screw Types and Abbreviations .......................................................3.3

Toois

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

..............................................3-l

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3-2

‘7

-. ;

S.ii

Page 76

REV.-A

3.1 Overview

This section describes the information you need to know before you disassemble or assemble the printer.

3.1.1 Precautions

Follow the precautions below before you disassemble or assemble the printer.

WARNING

Before disassembling, assembling, or adjusting the printer, disconnect the power supply cable from

the AC power outlet. Failure to do so may cause physical

secondary circuitry. Therefore, the printer’s primary circuitry remains live even after the power switch is turned off.

injury.

The power switch is wired in the

CAUTION

To maintain optimum printer operation, use only the recommended

Also only the lubricants recommended in Chapter 6. Adjust the printer only as described in this

manual. (See Chapter

3.1.2

Tools

4.)

tools for maintenance work.

Tables 3-1 and 3-2 list the recommended tools needed to disassemble, assemble, or adjust the printer. Use only tools that meet these specifications.

Table 3-1. Recommended

Tool

Round-nose pliers Nippers

Tweezers

Soldering iron E-ring holder #2.5 Phillips screwdriver no.2 Normal screwdriver

Thickness gauge

Tools

Part No. B7404OO1OO B7405OO1OO B741OOO1OO B7402OO1OO B740800400 B743800200 B743OOO1OO

Note: All the tools in the table above are commercially available.

Table 3-2. Equipment Required for Maintenance

Description Specification

Multimeter

Oscilloscope

3-1

20 MHz

Page 77

REV.-A

3.1.3 Service Checks After Repair

Before you send the printer back to the customer, fill in the checklist in Table 3-3 to note the current state of

the components. This checklist facilitates servicing and shipping.

Table 3-3. Inspection Checklist for Repaired Printer

ADJUSTMENTS

REV.-A

4.1 Adjusting the Printer Mechanism

4.1.1

Platen Gap Adjustment

4.2 Bidirectional Alignment Adjustment

4.2.1 Overview of the Bidirectional Alignment Adjustment ....................4-2

4.2.2 Bidirectional Alignment Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Prooedure

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

LIST OF FIGURES

Figure 4-1. PARALLELISM ADJUSTMENT BUSHING Figure 4-2. Bidirectional Alignment Adjustment (Draft mode) Figure 4-3. Bidirectional Alignment Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . .

(NLQ

mode)

. . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4-2

4-3

4-2 4-3 4-3

4-i

Epson FX-1170, FX-870 Service Manual

PRECAUTIONS

PREFACE

REVISION SHEET

TABLE OF CONTENTS

GENERAL DESCRIPTION

1.2 Specifications

OPERATION PRINCIPLES

DISASSEMBLY AND ASSEMBLY

ADJUSTMENTS