Epson GT-1200 Service Manual

EPSON

EPSON France S.A.

SERVICE MANUAL

GT-1200

PRODUIT

SERVICE MANUAL

Color Image Scanner

EPSON GT-12000

4008511

®

NOTICE

n

All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

n

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

n

All effort 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.

n

The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION. General Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective

owners. EPSON disclaims any and all rights in those marks.

PRECAUTIONS

Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment.

DANGER

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

WARNING

Signals a precaution which, if ignored, could result in damage to equipment.

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

DANGER

1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES.

2. NOWORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIER WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.

3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. W HEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION I N WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING

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

2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED O N THE SERIAL NUMBER/RATI NG PLATE. I F THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POW ER SOURCE, DO NOT CONNECT IT T O THE POW ER SOURCE.

3. ALWAYS VERIFY THAT T HE EPSON PRO DUCT HAS BEEN DISCO NNECT ED FROM THE PO WER SOURCE BEFORE REMOVING OR REPLACI NG PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.

4. I N ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUI TRY, USE STATIC DISCHARGE EQUI PMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF SECONDSOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.

PREFACE

This manual describes basic functions, theory of electr ical and m echanical oper ations, maintenance and repair procedures of G T-12000. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be g iven to the precaution s on the preceding page. T he chapters are organized as follows:

CHAPTER 1. PRODUCT DESCRIPTIONS

Provides a general overview and specifications of the product.

CHAPTER 2. OPERATING PRINCIPLES

Describes the theory of electrical and mechanical operations of the product.

CHAPTER 3. TROUBLESHOOTING

Provides the step-by-step procedures for troubleshooting.

CHAPTER 4. DISASSEMBLY AND ASSEMBLY

Describes the step-by-step procedures for disassembling and assembling the product.

CHAPTER 5. ADJUSTMENTS

Provides Epson-approved methods for adjustment.

CHAPTER 6. MAINTENANCE

Provides preventive maintenance procedures and the lists of Epson-approved lubricants and adhesives required for servicing the product.

APPENDIX

Provides the following additional information for reference:

• Connector pin assignments

• Electric circuit boards components layout

• Exploded diagram

• Electrical circuit boards schematics

REVISION STATUS

Rev. Date Page(s) Contents

A 1997/10/20 All First release

TABLE OF CONTENTS

PRODUCT DESCRIPTIONS

1.1 OVERVIEW....................................................................................................................................................................1-1

1.2 SPECIFICATION ...........................................................................................................................................................1-1

1.3........................................................................................................................................................................................1-4

1.3 INTERFACE SPECIFICATION ......................................................................................................................................1-4

1.4 CONTROL CODE..........................................................................................................................................................1-5

1.5 OPERATION SPECIFICATIONS...................................................................................................................................1-6

1.5.1 Switch Specification...........................................................................................................................................................................1-6

1.5.2 LED Specification ...............................................................................................................................................................................1-6

1.5.3 Switch Setting.....................................................................................................................................................................................1-7

1.5.4 Error Indication...................................................................................................................................................................................1-7

1.5.5 Readable Area..................................................................................................................................................................................... 1-8

1.5.6 Transportation Screw.........................................................................................................................................................................1-8

OPERATING PRINCIPLES

2.1 GENERAL DESCRIPTION ............................................................................................................................................2-1

2.2 MECHANISM OPERATING PRINCIPLES.....................................................................................................................2-2

2.3 ELECTRICAL CIRCUIT OPERATIONS.........................................................................................................................2-3

2.3.1 Control Circuit Operation...................................................................................................................................................................2-3

2.3.2 Power Supply Circuit Operation........................................................................................................................................................2-5

TROUBLESHOOTING

3.1 OVERVIEW....................................................................................................................................................................3-1

3.1.1 Error Detection by the Self-Diagnostic Function.............................................................................................................................3-1

3.1.2 Troubleshooting .................................................................................................................................................................................3-2

3.1.2.1 Test Points................................................................................................................................................................................3-2

3.1.2.2 Check Points for Abnormal Phenomenon.................................................................................................................................3-2

3.1.3 Troubleshooting for Electrical Circuit ..............................................................................................................................................3-8

3.1.3.1 Power Supply Board (B054PSH Board)....................................................................................................................................3-8

3.1.3.2 Control Circuit Board (B054MAIN Board)..................................................................................................................................3-9

DISASSEMBLY AND ASSEMBLY

4.1 OVERVIEW....................................................................................................................................................................4-1

4.1.1 Tools....................................................................................................................................................................................................4-1

4.1.2 Screws................................................................................................................... ..............................................................................4-1

4.2 DISASSEMBLY PROCEDURES ...................................................................................................................................4-2

4.2.1 Electrical Circuit Removal..................................................................................................................................................................4-3

4.2.1.1 EPROM Replacement...............................................................................................................................................................4-3

4.2.1.2 MAIN/B054PSH Board Removal...............................................................................................................................................4-4

4.2.2 Scanner Body Disassembly...............................................................................................................................................................4-5

4.2.2.1 Upper Housing Removal...........................................................................................................................................................4-5

4.2.2.2 Scanner Mechanism Removal .............................................................................................. ....................................................4-6

4.2.3 Scanner Mechanism Disassembly....................................................................................................................................................4-7

4.2.3.1 Panel Board Assembly Removal...............................................................................................................................................4-7

4.2.3.2 Sub Board Assembly Removal..................................................................................................................................................4-8

4.2.3.3 HP Sensor (CR) Removal.........................................................................................................................................................4-9

4.2.3.4 CR Motor Assembly Removal .................................................................................................................................................4-10

4.2.3.5 Glass Frame Assembly Removal and Pre-operation ..............................................................................................................4-11

4.2.3.6 Lamp Assembly and Inverter Board Assembly Removal ........................................................................................................4-14

4.2.3.7 HP (AF) Sensor Removal........................................................................................................................................................4-16

4.2.3.8 AF Motor Assembly Removal.................................................................................................................................................4-17

4.2.3.9 AF Motor Assembly Installation............................................................................................................................................... 4-18

4.2.3.10 Option Frame Assembly Removal.........................................................................................................................................4-19

ADJUSTMENT

5.1 OVERVIEW....................................................................................................................................................................5-1

MAINTENANCE

6.1 OVERVIEW....................................................................................................................................................................6-1

6.1.1 Cleaning...............................................................................................................................................................................................6-1

6.1.2 Lubrication..........................................................................................................................................................................................6-1

APPENDIX

7.1 OVERVIEW....................................................................................................................................................................7-1

7.1.1 Connector Pin Assignment................................................................................................................................................................7-1

7.1.2 Connector Summary...........................................................................................................................................................................7-1

7.2 COMPONENT LAYOUT ........................................................................................................... .....................................7-6

7.3 CIRCUIT DIAGRAMS ....................................................................................................................................................7-8

7.4 EXPLODED DIAGRAMS.............................................................................................................................................7-10

PRODUCT DESCRIPTIONS

CHAPTER

1

GT-12000 Product Descriptions

Rev. A

1-1

1.1 OVERVIEW

The GT-12000 is an A3 size flat-bed type color image scanner. The main features of the scanner are:

q High resolution

Optical resolution is 800 dpi.

q Wide readable area

Accommodates up to A3 size.

q High-quality image

12bit A/D input/output (optical density is 3.0.)

q High-speed scanning

Scanning A3/Portrate At 800dpi / Draft-mode; Full-color = Approx. 15mS/line 256 Gray = Approx. 10.8mS/line Line art = Approx. 10.8mS/line

q Adjustable Focusing function

Adjustable up to 5mm above the surface of document table.

q Quick operation

Xe-Gas Cold Cathode Fluorescent Lamp allows no initial light-up for immediate scanning.

q New command level: ESC/I-B8 (B6 level with Focus control) q Optional unit enhancing the function of the unit

n Transparency Unit n Duplex scanning ADF (Automatic Document Feeder)

1.2 SPECIFICATION

GENERAL

Type: Flat-bed color image scanner Scanning Method: Sub-Scanning mirror movement system Photoelectric Device: Color CCD Line sensor Color Separation: Color filter separation Light Source: Xe-Gas Cold Cathode Fluorescent Lamp Scanning Resolution: 800 (Main) by 800 (Sub) dpi Output Resolution: 50 to 3200dpi (1dpi increment) Effective Picture Element: 9760 by 13760 pixel (Max.) Maximum Readable Area: 12.2 by 17.2 inch (310 by 437mm) Scanning Speed: At 800 dpi / Draft mode;

Table 1-1. Scanning Speed

Original A4/Portrait A4/Portrait - A3/Portrait

Reading Area Less than 210mm 210 to 310mm Line Art Approx. 7.5mS/line Approx. 10.8mS/line 256 Gray-scale Approx. 7.5mS/line Approx. 10.8mS/line Full Color Approx. 10.0mS/line Approx. 15.0mS/line

GT-12000 Product Descriptions

Rev. A

1-

2

IMAGING FUNCTIONS

Gradation: Input/internal process = 12bit/pixel

Output = 8 or 12bit/pixel Zoom: 50 to 200% (1% increment) Gamma Correction: CRT (A/B)

PRINTER (A/B/C)

User definable (1 level) Color Correction: Impact-Dot Printer

Thermal Printer

Ink jet Printer

CRT Display

User definable (1 level) Brightness Control: 7 levels

Image Processing: Bi-level= Fixed threshold

TET

Half-toning= Error diffusion (A/B/C)

Dither (Resident) (A/B/C/D) Dither (user definable) (A/B)

Focusing: One-piece CCD/Lens movement system

INTERFACE

Standard Interface: Bi-Directional Parallel

SCSI (50/50 pin connectors)

SOFTWARE

Commend Level: ESC/I-B8 (B6 level with Focus control)

ELECTRICAL SPECIFICATION

Power supply voltage: [120 V version]

Rated voltage = AC100 - 120 V (± 10%) [220-240 V version] Rated voltage = AC220 - 240 V (± 10%)

Rated frequency range: 50 / 60 Hz (49.5 - 60.5 Hz) Power consumption: Approximately 60 W (without an optional unit)

Maximum 75 W (with an optional unit)

Insulation resistance: 10 M W at 500 VDC

(between AC line and chassis)

Dielectric strength: AC 1.5 KV / minute

(between AC line and chassis)

Static electricity: Panel = 10 KV

Metal = 7 KV / 150 pF, 150 W

SAFETY, EMC

Safety regulation: UL1950 with D3

CSA C22.2 NO. 950 with D3

Low voltage directive 73/23/EEC: EN60950 (TUV)

EN60950 Nordic Deviation (NEMKO)

EMC: FCC Part15 Subpart B Class B (USA)

CSA C108.8 Class B (Canada) AS/NZS3548 Class B

Directive 89/336/EEC: EN55022 Class B

EN61000-3-2 EN61000-3-3 EN50082-1 IEC 801-2 IEC 801-3 IEC 801-4

GT-12000 Product Descriptions

Rev. A

1-

3

ENVIRONMENTAL CONDITIONS

Temperature: Operating = 5 to 35°C

Storage = -25 to 60°C

Humidity: Operating = 10 to 80% (no condensation)

Storage = 10 to 85% (no condensation)

RELIABILITY

Main unit: MCBF 100,000 cycle

OPERATING CONDITIONS

Dust: Ordinary office or home conditions.

(Should be kept away from extreme dust.)

Illumination: Operation under direct sunlight or near

strong light source should be avoided.

DOCUMENT

Reflective type: Smooth surface such as a printing and

photograph.

Transparency type: Reversal film, Negative film

Note: The optional transparency unit must be used.

PHYSICAL DIMENSIONS AND WEIGHT

Dimensions: 656 (W) x 458 (D) x 170 mm (H)

(See Figure 1-1.)

Weight: Approximately 20 Kg

656mm

458mm

170mm

(6.7")

(25.8")

(18")

Figure 1-1. External Dimension of the GT-12000

GT-12000 Product Descriptions

Rev. A

1-

4

1.3 INTERFACE SPECIFICATION

This scanner is equipped with the following interfaces:

q Bi-directional Parallel Interface

n Data: 8 bit parallel n Handshake: BUSY, /ACK handshaking n Signal: TTL level n Connector: 36 pins (Amphenol)

q SCSI interface

n Function: Conforms to ANSI Standard X3.131-1986. n Electrical specification:Conforms to ANSI Standard X3.131-1986.

(TTL compatible level)

n Connector: 50 / 50 pin (Amphenol) n Terminator: Internal terminator

Switches between “active” and “ inactive”

n SCSI ID Set with an internal rotary switch

(Range: 0 - 7)

GT-12000 Product Descriptions

Rev. A

1-

5

1.4 CONTROL CODE

The command level for this scanner is ESC/I-B8. The commands supported are shown in the table below.

Table 1-2. Control Code Summary

Category Command Name Code

Execute Command Identity Request ESC I

Status Flag Request ESC F Extended Status Flag Request

ESC f

Parameter Request ESC S Scanning Start ESC G

Data Format Setting Set Data Format ESC Di

Set Resolution ESC R n1 n2 Set Zooming ESC H i1 i2 Set Read Area ESC A n1 n2 n3 n4 Set Color ESC Ci Mirroring ESC Ki

Image Setting Set Brightness ESC Li

Set Gamma Correction ESC Zi Download Gamma Table ESC zi d0 d1 - d255 Set Sharpness ESC Qi

Image Processing Set Digital Halftoning ESC Bi

Set Auto Area Segmentation

ESC si

Download Dither Pattern ESC b I I j d (j2) Set Color Correction ESC Mi Download Color Correction ESC m d1 d2 - d9 Set Threshold ESC t

Table 1-3. Control Code Summary (continued)

Category Command Name Code

Auxiliary Set Scanning Mode ESC gi

Initnialize ESC @ Set Line Counter ESC di Control Option ESC ei Set Focus ESC pi Focus Position Request ESC q Set Ratio Correction for Main and Sub Scan

ESC Wi

Set the Film type ESC Ni Eject Paper ESC FF Feed Paper ESC PF

Control Normal Response ACK

Abnormal Response NACK Abort Scanning CAN Header STX

GT-12000 Product Descriptions

Rev. A

1-

6

1.5 OPERATION SPECIFICATIONS

1.5.1 Switch Specification

This scanner is equipped with 4 switches. Their functions are described below:

q “

OPERATE

“

n Turns on and off the scanner. n Pressing this switch for power-on initializes the scanner.

q “

RESET

”

Initializes the scanner.

q

SCSI ID rotary switch

(located at the back of the scanner) Sets the SCSI device ID for this scanner when the SCSI interface is used to connect the scanner with the host computer.

Note: The factory default value for this scanner is “2”.

q

SCSI terminator setting switch

(located at the back of the scanner) Alternates the internal terminator setting between “Connected” and “Disconnected” when the SCSI interface is in use.

Note: The factory default setting for this switch is “On” (Connected).

1.5.2 LED Specification

This scanner has the following 3 LED indicators:

q

OPERATE

n

Indicates the scanner’s power On/Off status. It is on when the scanner power is on.

q

READY

n

n Comes on when the scanner is ready to receive commands. It

flickers during scanning due to data transmission between the host computer and the scanner.

n Indicates an error type in combination with the ERROR LED

indicator when an error has occurred.

q

ERROR

nnnn

Comes On when an error has occurred.

ERROR

READY

OPERATE RESET OPERATE

ON

OFF

SW

0

1

5

2

3

4

7

6

Figure 1-2. Buttons, Switches and LED Indicators

GT-12000 Product Descriptions

Rev. A

1-

7

1.5.3 Switch Setting

Among the switches equipped with this scanner, SCSI switch and the terminator switch, which are used for SCSI interface, have the following settings: q SCSI-ID setting switch

ID No. Availability Note

0 Available Normally assigned to other SCSI device such

as a hard disc.

1 Available Normally assigned to other SCSI device such

as a hard disc. 2 Available Set at the factory to the scanner. 3 Available 4 Available 5 Available 6 Available 7 Available Normally assigned to the SCSI host adopter.

(Blank) Not Available Not effective / Not used

*

Not Available Not effective / Not used

CHECK POINT

üüüü

Do not set the ID number that is already assigned to other SCSI device.

q Terminator switch

Setting Note

ON Connects to the terminal resistor. /Factory default

setting

OFF Disconnects from the terminal resistor.

CHECK POINT

üüüü

Be aware that the terminator switch must be set according to the scanner location on the “daisychain”.

1.5.4 Error Indication

When an error has occurred, the error type is indicated by the corresponding combination of the “READY” and “ERROR” LED indicators.

Table 1-4. Error Types and Corresponding Indications

READY

n

ERROR

nnnn

Error Type

ON ON Command error OFF Blinks Communication error Blinks Blinks Fatal error OFF OFF Option error

Note: The remedies for these errors are provided in Chapter 3

“Troubleshooting”.

GT-12000 Product Descriptions

Rev. A

1-

8

1.5.5 Readable Area

The origin point for this scanner is marked at the rear left corner of the document table viewed from the front. See Figure 1-3 for the maximum readable area of the scanner.

310mm

437mm

2 ±1.5mm

2 ±1.5mm2 ±1.5mm

Sub Scan Direction

Main Scan Direction

Front

Origin Point

Maximum Readable Area

(12.2")

(17.2")

Figure 1-3. Maximum Readable Area

1.5.6 Transportation Screw

A transportation screw is attached to the left side of the scanner viewed from the front. Fastening the screw fixes the CR to protect the scanner from the shock while the scanner is transported or moved. Be sure to turn the screw to the unlocking position (Described in the figure below.) before turning the scanner power on.

Locking position set w hile transporting/m oving the scanner.

U n lo c k in g p o s it io n s e t w h ile the scanner is used.

Figure 1-4. Transportation Screw

OPERATING PRINCIPLES

CHAPTER

2

GT-12000 Operating Principles

Rev. A

2-1

2.1 GENERAL DESCRIPTION

The EPSON GT-12000 is mainly composed of the following units: q Scanner mechanism

(Lamp/Mirror units, CR drive mechanism, integral lens/CCD sensor unit drive mechanism)

q Control Circuit q Power supply circuit

The EPSON flat-bed type scanners usually read images by moving the integral CR unit which consists of the lamp, m irror, lens/CCD sensor. This scanner, however, characteristically has the CCD sensor and the lens in the whole unit attached onto the mechanism as an independent unit. This scanner is also equipped with the newly designed focusing function which enables the scanner to focus by adjusting the distance between the lens and the CCD sensor. Therefore, the lens unit is set m ovable and driven by the specified motor. Since the separate units in the mechanism such as the lamp (light source) and the mirrors move at their own speed for reading, the incident distance of the reflected light f rom the document to the CCD sensor is kept constant. The control circuit board and the power supply circuit board are stored in the separate shield compartment. Since it is only connected to the connector board in the scanner mechanism, it is removed and maintained with ease.

B054SUB Board

CN1

CN2

CN3

CN6

CN7 CN5

CN4

B054PNL Board Motor

(for Lens Unit Drive)

Lamp/Mirror Unit

Mirror Unit

HP Sensor (for Mirror)

Motor (for Lamp/Mirror Drive)

Drive Wires

B054PSH Board (Power Supply Circuit)

AC Input

SCSI ID Switch

Terminator Switch

HP Sensor (Lens)

B054ISN Board (CCD Sensor)

Lens Unit

(Optional)

I/F

B054MAIN Board (Control Circuit)

SCSI

I/F

Bi-D

I/F

Document

Figure 2-1. Main mechanism Structure of the GT-12000

GT-12000 Operating Principles

Rev. A

2-

2

2.2 MECHANISM OPERATING PRINCIPLES

Compared with other EPSON scanners, the main feature of this scanner lies in its new optical mechanism used for reading images. Instead of the united lamp & CCD movement system used for other scanners, this scanner scans with the fixed CCD sensor and separate lamp and the mirror units. Since the color CCD line sensor is used for the reading device, only one light source is equipped and light is separated through the RGB color filter.

As shown in Figure 2-2, the light source (high luminance cold cathode xenon lamp), the first reflection mirror unit and the second reflection mirror unit move independently at their own speed. Therefore the length of the incident light reflected from the document to the CCD sensor is kept constant. (Otherwise, excluding the fixed L1 and L2, LV1 and LV2 keep changing to make the incident light length “L” constant.) Drive from the stepping motor moves each mirror unit via the wires.

The CCD sensor and the lens are united into one unit, which is semi-fixed on the base frame. For focusing function, it moves toward the optic with the drive sent from the motor. (The focusing area with this function is from 0 to 5 mm (maximum) above from the glass surface.

x1

x2

L1 (Fixed)

Document

LV1 (Variable)

Document Glass

L2 (Fixed)

Mirror Unit

Lamp/Mirror unit

Lens Unit

CCD Sensor

LV2 (Variable)

Figure 2-2. Optical Unit Structure

GT-12000 Operating Principles

Rev. A

2-

3

2.3 ELECTRICAL CIRCUIT OPERATIONS

This section describes the electrical circuit of the GT-12000.

2.3.1 Control Circuit Operation

The control circuits of this scanner are:

q B054MAIN board (Main control circuit board) q B054SUB board (Relay board) q B054PNL board (Control panel board) q B054ISN board (CCD sensor board located on the CR)

Among various functions controlled by B054MAIN board, the core control circuit of the scanner, and B054ISN, process from reading image with the CCD sensor to processing image signals is described below:

q B054ISN Board (CCD image sensor)

n Photoelectric conversion:

Converts light reflected from the document (light energy) into electrical energy (electrical charge).

n Amplification n A/D conversion:

Converts the image data produced in the form of analog electrical signal into 12-bit digital data.

q B054 MAIN Board (processing image data)

ASIC (IC24) on this board manages most of the following functions:

n Shading correction:

Performs image data correction on a black and white basis.

n Numbers of image correction such as gamma correction, color

correction, halftoning correction. (They are carried out according to the settings on the host side.)

After passed these processes, image data is finally output to the host.

CCD

CPU IC 1 3 (H D 6413003TF)

M PX A/D IC 2 (A D 9807)

R G B

12bit

IC 2 4 (M ERCURY)

IC 2 8 (GGIF)

IC 1 EPRO M (1Mbit)

IC 1 7 PSRAM (1Mbit)

Motor driver IC 3/4/5/6

DRAM (1M x 4) IC 7/8/9

PSRAM (1Mbit) IC 1 8 - 2 3

DRAM (1M x 4) IC 10/11/12

CN2 B i-D I/F

CN1/3 SCSI I/F

CN6 Option

Document

In v e r te r

B054 ISN Board

TPU

ADF

Shading

G am m a Correction Line C orrection M ain/S ub Average Color Correction Sm oothing Zoom Bi/Q uad Form atting TET

AAS

M irro r S h ift Lens Shift

H P Sensor 1/2

B054 MAIN Board

Light

Quanti

t

y

Mon

i

t

or

Figure 2-3. Control Circuit Block Chart

GT-12000 Operating Principles

Rev. A

2-

4

B054MAIN BOARD

Name Location Description

CPU HD6413003TF

IC13 The CPU, which operates at 16 MHz,

controls this board. ASIC MERCURY

IC24 an image processor which controls the

followings:

· CCD

· Line correction memory

· Buffer memory

· Image processing

ASIC CGIF

IC28 This I/F control processor controls the

followings:

· SCSI I/F

· Bi-D I/F

· Address decode

· PSRAM refresh

· Reset control

DRAM (1MX4)

IC7-9 IC10-12

Line correction memory

Buffer memory PSRAM (1M) IC8-23 RGB image memory ROM (1M) IC1 Firmware memory

B054ISN BOARD

Name Location Description

CCD sensor ILX734K

IC1 Color CCD line sensor

· Effective pixel = 10500x3 lines

· Single side reading system

· Shutter function

ADC AD9807

IC2 A/D converter processing IC

Minimum resolution = 12 bit

B054SUB BOARD

This is a relay board, a module is in the shield compound along with the PSB/PSE board, which connects the B054ISN in the mechanism with the B054PNL board.

B054PNL BOARD

This board has a power switch (push-lock), RESET switch and LED indicators (OPERATE, READY, ERROR).

GT-12000 Operating Principles

Rev. A

2-

5

2.3.2 Power Supply Circuit Operation

Since the power supply circuit board B054PSH for this scanner meets the universal specification, it can use the rated voltage in the range from 100V to 240V. The electrical circuit for the AC input part is designed on the basis of 200V line. In case the input voltage is 200V line level, the ordinary full wave rectifying system is used. With this system, the voltage is rectified by the diode bridge DB1 and then smoothed by the serial smoothing capacitors C11 and C32 to produce approximately 250 VDC. On the other hand, if the input voltage is 100V line level, the doubled voltage rectifying system is used instead. With this system, the input AC current is separated into the following 2 flows; the positive half cycles of the current flow through the control IC (IC2) (from Pin 2 to Pin 3) via the diode bridge (DB1) and the smoothing capacitor C11, and the negative half cycles of the current, however, flow through the smoothing capacitor (C32) and DB1 via IC2 (from Pin 3 to Pin 2). Through these flows, the positive and negative AC current are separately charged in the smoothing capacitors C11 and C32, respectively, and the doubled VDC (approximately 250 VDC) equivalent to the input voltage of the 200V line is produced. At power-on, the control circuit (IC2) is activated by the full wave rectifying system. Then, if the input voltage is 100 VDC line level, the system is automatically switched to the doubled voltage rectifying system after certain period set by the circuit constant. Except for the full wave rectifier circuit/voltage doubler rectifier circuit at the AC input part, the normal RCC (Ringing Choke Converter) regulator circuit is used for the rest part of the power supply circuit, and the dif f er ent levels of VDC are distributed to corresponding mechanisms, as shown in Table 2-1:

Table 2-1. DC Output Power

Output VDC Application

+5 V Logic power lines +24 V q Motor drive power source

q Power source for the lamp (inverter)

+15 V +12 V production

(Power used to drive the cooling fan for the shield compartment which stores B054 MAIN and B054PSH.)

+

Positive Component

AC input

DB1

C11

C32

IC2

Negative Component

Doubled Voltage Output

[AC Input] 100 V = On 200 V = Off

Figure 2-4. Voltage Doubler Rectifier Circuit Operation

TROUBLESHOOTING

CHAPTER

3

GT-12000 Troubleshooting

Rev. A

3-1

3.1 OVERVIEW

This chapter describes the troubleshooting which enables you to solve the problem efficiently when the scanner is operating abnormally. The remedies for the errors detected by the self-diagnostic function and the check point for each phenomenon are described in the following sections.

3.1.1 Error Detection by the Self-Diagnostic Function

The self-diagnostic function equipped with this scanner automatically detects operating status of each part. The abnormal phenomenon detected by the function and remedies are as follows:

Command Error

LED Status Cause Operation/Condition

READY ERROR

Undefined command is detected.

Ignores the wrong command /parameter (No change made for the current settings.), and returns NACK to wait for the next command/ parameter.

Remedy

The error is cleared by the correct command/ parameter.

Communication Error

LED Status Cause

Operation/

Condition

READY ERROR

· Wrong procedure/operation is detected in communication.

· In case of SCSI, communication stops for over 30 seconds in any phase other than bus free phase.

The lamp goes off and the scanner stops operating.

Remedy

Turn the scanner Off and back On or press the “RESET” switch.

Fatal Error

LED Status Cause Operation/Condition

READY ERROR

· The lamp does not light.

· Scanner is turned on with

the CR unlocked.

· Other defects in the scanner.

· The lamp goes off and the scanner stops operating.

· Sets the status bit “7”.

Remedy

Turn the scanner Off and back On or press the “RESET” switch.

Option Error

LED Status Cause Operation/Condition

READY ERROR

· The scanner cover is left open.

· Paper end, etc..

Sets the status bit “7”.

Remedy

Remove the cause of the error.

CHECK POINT

üüüü

[Option Error] is detected when the option is installed in the operative condition only.

GT-12000 Troubleshooting

Rev. A

3-

2

3.1.2 Troubleshooting

This section provides test points for each major unit and check points for each abnormal phenomenon.

3.1.2.1 Test Points

Test points for the motors and sensors are shown in the tables below.

Motors

q

Condition: Test the motor without any cables connected.

Motor Test Point Signal Level

Motor (for driving the mirror)

Between Pin 1 and Pin3

Between Pin 2 and Pin 4

15.0 W

Motor (for driving the focusing mechanism)

Between Pin 1 and Pin3

Between Pin 2 and Pin 4

15.5 W

Sensors

q

Condition: Test with the scanner power on.

Motor Test Point Signal Level

HP sensor (Mirror)

<B054SUB board> CN6: Pin 1 (Signal) Pin 2 (GND)

H: In the home position L: Off the home position

HP sensor (Lens/CCD)

<B054SUB board> CN4: Pin 1 (Signal) Pin 2 (GND)

H: In the home position L: Off the home position

CAUTION

Be careful not to short-circuit the signals while checking them.

3.1.2.2 Check Points for Abnormal Phenomenon

See the table below which shows the abnormal phenomenon typically occurs.

Table 3-1. Abnormal Phenomenon

Abnormal Phenomenon Description

Flowchart

to refer

The scanner doesn’t operate at power on.

“OPERATE” LED does not light.

3-1

“Fatal Error” is indicated and. CR does not move. 3-2 is not cleared after the scanner is turned off and back on

Abnormal movement of CR, such as crashing into the frame.

3-3

Lamp does not light. 3-4 “Communication Error” is indicated.

Error when Bi-directional

parallel I/F is used.

3-5

Error when the SCSI is

used.

3-6

Scanned image is abnormal.

Black lines, White

banding, and so on

3-7

Check points for the major units listed for each phenomenon are shown in the following pages.

GT-12000 Troubleshooting

Rev. A

3-

3

Flowchart 3-1 Phenomenon: “Operate” LED does not light.

Disconnect the cables from the connectors CN2/4/5/6/7 on the B054MAIN board, then, with the scanner power on, check the connector CN 5 on the B054MAIN board for the correct voltages shown below:

Between Pins 1 and 4 : +24VDC Between Pins 7 and 4 : + 5 VDC Between Pins 9 and 10 : +15VDC

Are the CN1 on the B054SUB board and the shield

compartment connected

properly?

Yes

No

Start

Has the

fuse F1/F2 on the

B054PSH board

blown out?

Yes

No

Are the outputs all corrects?

A

Replace the B054PSH board.

Yes

No

Connect the m properly.

Replace the

fuse. Has the fuse

blown again at turning

on the scanner?

A

Replace the B054PSH board.

Disconnect the connector cables from the connectors CN2/4/5/6/7 on the B054SUB board.

No

Yes

A

Check the following motors for the correct res i s tance:

- Motor (for mirror) : 15.0

Ω

- Motor (for focus) : 15.5

Ω

Are the resistances correct?

Check the motor driver ICs on the B054MAIN boar d.

<Motor (for mirror) > Check if the resistanc e between Pin 8/ 6 of IC4/3 and the GND is infinitive.

<Motor(focus)> Check if the resistanc e between Pin 1/ 15 of IC5/6 and the GND is infinitive.

Replace the

B054MAIN

board.

Are they correct?

Replace the

motor.

Yes

No

Replace the

B054MAIN

board.

GT-12000 Troubleshooting

Rev. A

3-

4

Flowchart 3-2 Phenomenon: CR (Mirror/Lamp) does not move.

Start

With the scanner power On, check the connector CN5 on the B054MAIN board for the correct +24 VDC output from the following :

Between Pin 1 and Pin 4 : +24 VDC

Turn th scanner off and move the CR

manually to chec k i f it move s smoothly.

Does the CR move abnomrmally?

The mechanism is abnormal. (Needs replacing.)

Unlock the screw.

No

Yes

No

Yes

Is the transportation

screw set to the locking

position?

Is the correct voltage output?

Replace the

B054PSH board.

A

Yes

No

Yes

A

Check the following motors for the correct resistance:

- Motor (for mirro r) : 15.0

W

- Motor (for focus) : 15.5

W

Are the resistances correct?

Check the motor driver ICs on the B054MAIN board.

<Motor (for mirror) > Check if the resistance between Pin 8/6 of IC4/3 and the GND is infinitive.

<Motor(focus)> Check if the resistance between Pin 1/15 of IC5/6 and the GND is infinitive.

Replace the

B054MAIN

board.

Are they correct?

Replace the

motor.

Yes

No

Replace the

B054MAIN

board.

GT-12000 Troubleshooting

Rev. A

3-

5

Flowchart 3-3 Phenomenon: CR moves abnormally. (Crashing into the frame)

Start

Replace the HP sensor (for mirror).

Set the screw to the unlocking position.

No

Yes

Check the connector CN4 on the B054 MAIN board for the HP s i

g

nal level.

Is the signal

level "HIGH" when the

CR is at the home

position?

Replace the B054MAIN boar d.

No

Yes

Is the transportation

screw set to the lockin

g

position?

Flowchart 3-4 Phenomenon: Lamp does not light.

Start

Replace the

B054MAIN board.

Does the lamp l ight

normally?

Lamp is

defective.

No

Yes

Replace the inverter board on the CR.

Does the l amp light normally?

Inverter board

is defective.

No

Yes

Replace the lamp on the CR.

GT-12000 Troubleshooting

Rev. A

3-

6

Flowchart 3-5 Phenomenon: “Communication Error

” (Bi-directional I/F)

” (Bi-directional I/F)” (Bi-directional I/F)

” (Bi-directional I/F)

is indicated.

Start

Repace the

B054MAIN board.

No

Yes

Replace the int erface cable.

Does the scanner operate normally?

Replace the I/ F cable.

Flowchart 3-6 Phenomenon: “Communication Error

” (SCSI)

” (SCSI)” (SCSI)

” (SCSI)

is indicated.

Replace the

B054MAIN board.

Are the settings correct?

Set them correctly.

No

Yes

Replace the I/F c able.

I/F cable is

defective.

No

Yes

Does the scanner operate normally?

Start

Check the SCSI for the following settings:

- Terminator settin

g

- SCSI ID settin

g



GT-12000 Troubleshooting

Rev. A

3-

7

Flowchart 3-7 Phenomenon: Scanned image is abnormal.

Start

B054MAIN

board is

defective.

Clean the

glass.

No

Yes

Clean the

mirror.

No

Yes

Replace the B054MAIN board and

perform a test scannin

g

.

Is the image normal?

The mechnasim is

defective.

(Needs replacing.)

No

Is the glass free of stain

and foreign matter?

Wipe the mirror with a dr

y

, clean cloth only.

Is the mirror free of stain and forei

g

n matter?

Yes

GT-12000 Troubleshooting

Rev. A

3-

8

3.1.3 Troubleshooting for Electrical Circuit

This section describes the abnormal phenomenon and corresponding check points for each electrical circuit board.

3.1.3.1 Power Supply Board (B054PSH Board)

Phenomenon Check Points

+5VDC is not output.

Check IC51 (TL494):

· Signal waveform output from Pin 8/11 (chopping waveform)

+24 VDC is not output.

Check the Switching FET/Q1:

· Waveform at the drain

+15 VDC in not output.

Check IC52 (78M15):

· Signal waveform output from Pin 1

GT-12000 Troubleshooting

Rev. A

3-

9

3.1.3.2 Control Circuit Board (B054MAIN Board)

Phenomenon Check Points

<No operation at all> Reset IC is defective.

Check the reset IC (IC2) for the signal waveforms output from the following pins:

· Pin 7 (for +5V input)

· Pin 6 (for PWRES output)

<No operation at all> ROM access is bad.

Check the CPU (IC13) for the ROM access signal waveforms output from the following pins:

· Pin 104 (for CS0 signal)

· Pin 78 (for RD signal)

<No operation at all> CPU is defective.

Check the clock signal waveform input to the following pin:

· Pin 75 (for XTAL input)

GT-12000 Troubleshooting

Rev. A

3-1

0

Phenomenon Check Points

<”Fatal Error”> Motor (for mirror) driver circuit

is defective.

Check the Driver IC (IC3/4:

· Phase drive signal waveform output from Pin 8/6

<”Fatal Error”> Motor (for focus) driver circuit

is defective.

Check the driver IC (IC5/6):

· Phase drive signal waveform output from Pin 1/15

<”Fatal Error”> CR does not stop at the home

position.

· Check if the signal waveform input to Pin 91 of CPU (IC13) changes in accordance with the CR position.

<”Fatal Error”> Lamp does not light.

Check the following for the lamp signal output:

· Output from Pin 166 of ASIC (IC24)

· Emitter waveform at Tr (Q1)

<”Fatal Error”> White standard level is not

read properly.

Check ASIC (IC28):

· Signal waveform output from Pin 161

<”Communication Error”> Bi-directional I/F / SCSI I/F

Main cause: ASIC (IC28) is defective. (Replace IC28 or B054MAIN board.)

<Image is read abnormally> Main cause: ASIC (IC24) is

defective. (Replace IC24 or B054MAIN board.)

DISASSEMBLY AND ASSEMBLY

CHAPTER

4

GT-12000 Disassembly and Assembly

Rev. A

4-1

4.1 OVERVIEW

This chapter describes how to disassemble this scanner. Unless otherwise specified, assembly can be accomplished by following disassembly procedures in reverse order.

WARNING

n

n n

n Be sure to disconnect the power cable from the

AC power socket prior to servicing.

n

n n

n Since this scanner weighs heavy

(approximately 20 Kg), it must be carried by 2 people.

CAUTION

n

n n

n Never disassemble any scanner parts unless

specified to do so, because this scanner mechanism needs assembling and adjusting rather exactly to preserve accurate control system at its satisfactory level.

n

n n

n Get yourself enough room for servicing,

considering the size of the scanner.

n

n n

n Since this scanner weighs as heavy as

approximately 20 kg, be sure to perform servicing on a heavy-duty, level table.

n

n n

n Make sure that the “CR fixing knob” is set to

the locking position to fix the CR by the rear before packing the scanner.

4.1.1 Tools

Tools used for servicing are as listed in the table below:

Table 4-1 .Tool List

Description Availability SE Part No.

Exclusive adjusting tools (Leveling tools)

EPSON exclusive Code: 1039140

Phillips screw driver (No.2)

¡

–

Standard screw driver (No.1)

¡

–

Tweezers

¡

–

4.1.2 Screws

Screws used in this scanner are listed in the table below. Be sure to use the correct types and numbers of screws for each part when assembling the scanner.

Table 4-2. Screw List

No.

Screw Type /

Specification

Appearance Color

1 CBP M4x12 Silver

2 CB M4x10 Gold

3 CBS M3x6 Red copper

4 CB M3x4 Gold

5 CBP M3x8 Gold

6 CB M3x6 Gold

7 CB M3x12 Black

8

CR;B damper shaft (Thread part: M3x3)

Gold

9 CP M3x6 Silver

10

Screw lock screw (Diagonal: 5 mm)

Silver

GT-12000 Disassembly and Assembly

Rev. A

4-

2

4.2 DISASSEMBLY PROCEDURES

This section describes disassembling and removing procedures for each major unit of the scanner.

See the flowchart in Figure 4-1. The jobs in the yellow boxes involve using the adjustment tools exclusively designed for this scanner. Therefore, make sure that you read the instruction for the section to refer to carefully to figure out the procedure before servicing.

Start

Electrical Circuit

Remova

(Section 4.2.1)

EPROM Replacement

(Section 4.2.1.1)

MAIN/Power Supply Board

Removal (Section 4.2.1.2)

Scanner Body

Disassembly

(Section 4.2.2)

Upper Housing Removal

(Section 4.2.2.1)

Mechanism Removal

(Section 4.2.2.2)

Panel Board Assembly Removal

(Section 4.2.3.1)

Sub Board Assembly Remvo al

(Section 4.2.3.2)

HP Sensor (CR) Removal

(Section 4.2.3.3)

Motor (CR) Assembly Removal

(Section 4.2.3.4)

Glass Frame Assembly Removal

(Section 4.2.3.5)

Scanner Mechanism

Dsassembly

(Section 4.2.3)

Lamp/Inverter Board Assembly

Removal (Section 4.2.3.6)

HP Sensor (AF)

Removal (Section 4.2.3.7)

Option Frame Assembly

Removal (Section 4.2.3.9)

Figure 4-1. Procedure for Disassembling the GT-12000

GT-12000 Disassembly and Assembly

Rev. A

4-

3

4.2.1 Electrical Circuit Removal

The major electrical circuit boards (B054MAIN and B054PSH) of this scanner are all stored in one independent shield compartment. Therefore, they can be removed in one unit (board unit) from the scanner with ease.

1. Disconnect the AC power cable from the scanner.

2. Remove 3 screws (No.5) securing the shield compartment which contains the electrical circuit boards at the back of the scanner. Then take out the compartment from the scanner to remove.

CHECK POINT

üüüü

For easy removal, insert a driver or equivalent into the bail lock of the interface and pull it.

4.2.1.1 EPROM Replacement

In case of EPROM replacement, remove the ROM cover attached on the board unit.

1. Remove the board unit. (See Section 4.2.1.)

2. Remove 1 screw (No.3) fixing the ROM cover, and remove the cover.

3. Remove the EPROM from the IC socket and install a new EPROM.

CAUTION

When installing the ROM, make sure that the leads are not bent and the ROM is installed in the right direction.

S c re w (N o .5 )

Take out

Figure 4-2. Shield Compartment Removal

Screw (No.3)

ROM Cover

Figure 4-3. ROM Cover Removal

GT-12000 Disassembly and Assembly

Rev. A

4-

4

4.2.1.2 MAIN/B054PSH Board Removal

B054MAIN and B054PSH boards stored in the shield compartment are removed in the following procedure:

1. Remove the shield compartment. (See Section 4.2.1.)

2. Remove 12 screws (No.3) securing the top shield of the board unit, then remove the top shield.

3.

[MAIN board assembly removal]

Disconnect the connector cables from the connector CN5 and CN9 on the MAIN board.

4. Remove the following screws securing the MAIN board, and remove the MAIN board:

Ÿ

6 screws (No.3): Fixing the board along the edges.

Ÿ

6 screws (No. 9): Securing the I/F connector.

Ÿ 2 screws (No.10): Securing the optional I/F connector.

.

5.

[Power supply board assembly removal]

Remove the connector cables from the connector CN1 on the power supply board assembly

and the connector CN5 on the MAIN board

assembly.

6. Remove 6 screws (No.3) securing the power supply board assembly and remove the power supply board.

S c re w (N o .9 )

Screw Lock Screw (N o.10)

Figure 4-4. I/F Connector Fixing Screw Removal

Connector (CN5) Connector (CN9)

Screws (No.3)

B054MAIN Board

Figure 4-5. MAIN Board Removal

Connector (CN5)

Screws (No.3)

Connector (CN1)

B054PSH Bo a r d

Figure 4-6. Power Supply Board Removal

GT-12000 Disassembly and Assembly

Rev. A

4-

5

4.2.2 Scanner Body Disassembly

This section describes procedures for disassembling the major units of the scanner.

CAUTION

When removing the CR fixing knob or screw caps, be careful not to damage the upper housing.

4.2.2.1 Upper Housing Removal

1. Remove the document cover.

2. Using tweezers, remove the CR fixing knob attached to the left side of the scanner.

3. Remove 4 screws (2 for each of No1 and No.2) securing the upper housing to the chassises on the scanner. Note that the front 2 screws are covered with the screw caps. Using tweezers, pinch them out prior to removing the screws.

4. Lift up the upper housing to remove it.

CHECK POINT

üüüü

When installing the upper housing, make sure that the optical plate is installed on the specified position.

Optical Plate

Inner S ide of the Upper Housing

Screw Cap

Be careful not to dam age the upper housing.

C ro ss-se ctio n

U sing the tw eezers, rem ove the cap by lifting it up w hile pushing it tow ard the other side of the cutout.

Figure 4-7. Screw Cap Removal

S c re w s (N o .1 )

Screw Cap

C R Fixing Knob

Screw Cap

S c re w s (N o .2 )

Figure 4-8. Upper Housing Removal

GT-12000 Disassembly and Assembly

Rev. A

4-

6

4.2.2.2 Scanner Mechanism Removal

The scanner mechanism can be removed from the lower housing in the following procedure:

1. Remove the upper housing. (See Section 4.2.2.1.)

2. Remove 4 screws (No.1) securing the scanner mechanism to the lower housing at the bottom. Then remove the mechanism from the lower housing.

CHECK POINT

üüüü

n

n n

n Note the following when installing the scanner

mechanism:

1) Remove the key tops for the power switch and reset switches from the lower housing.

2) Install the scanner mechanism to the lower housing.

3) Reinstall the key tops.

n

n n

n Place the removed mechanism on flat stable

surface.

Screws (No.1)

Front Side of the Scanner

Scanner Me chanism

Figure 4-9. Scanner Mechanism Removal

GT-12000 Disassembly and Assembly

Rev. A

4-

7

4.2.3 Scanner Mechanism Disassembly

The rest part of the chapter describes the procedures for removing the major parts/units in the scanner mechanism.

CAUTION

Note that producing this scanner requires rather precise assembly and adjustment to ensure accurate control system. Therefore, never disassemble any scanner parts unless specified to do so.

4.2.3.1 Panel Board Assembly Removal

1. Remove the scanner mechanism. (See Section 4.2.2.2.)

2. Turn the mechanism over and place it on a flat surface.

3. Disconnect all connector cables from the panel board assembly.

4. Remove 2 screws (No.6) securing the panel board assembly and remove it.

CHECK POINT

üüüü

Unit arrangement at the bottom of the mechanism is as shown below.

Motor (CR)

HP Sensor (CR)

Panel Board Assembly

Sub Board Assembly

HP Sensor (AF)

Screws (No.6)

Panel Board Assembly

Figure 4-10. Panel Board Assembly Removal

GT-12000 Disassembly and Assembly

Rev. A

4-

8

4.2.3.2 Sub Board Assembly Removal

1. Remove the scanner mechanism. (See Section 4.2.2.2.)

2. Turn the mechanism over and place it on a flat surface.

3. Disconnect all connector cables from the sub board assembly (B054SUB board).

4. Remove 2 screws (No.3) securing the board to the br acket and r emove the sub board.

CHECK POINT

üüüü

When placing the scanner up side down, lay a clean soft cloth under the scanner to protect the glass surface.

Screws (No.6)

Sub Board Assembly

Figure 4-11. Sub Board Assembly Removal

GT-12000 Disassembly and Assembly

Rev. A

4-

9

4.2.3.3 HP Sensor (CR) Removal

This section describes procedure for removing the HP sensor which detects the reference position for the carriage mirror assembly.

1. Remove the scanner mechanism. (See Section 4.2.2.2.)

2. Move the carriage mirror assembly away from the HP (home position).

3. Turn the mechanism over and place it on a flat surface.

4. Release the hook fixing the HP sensor at the bottom of the mechanism and remove the HP sensor unit. Then disconnect the connect or cable from the removed HP sensor.

HP Sensor (AF)

Sub Board Assembly

Panel Board AssemblyHP Sensor (CR)

Motor (CR)

Figure 4-12. HP Sensor (CR) Removal

GT-12000 Disassembly and Assembly

Rev. A

4-1

0

4.2.3.4 CR Motor Assembly Removal

This section describes procedure for removing the motor unit which drives the carriage mechanism (mirror/lamp).

1. Remove the scanner mechanism. (See Section 4.2.2.2.)

2. Turn the mechanism over and place it on a flat surface.

3. Unhook the torsion spring from the tension lever assembly, then remove 1 screw (No.6) to remove the tension lever assembly.

4. Disconnect the cable for the motor from the relay connector and remove 4 CR damper shafts; B (No.8) securing the motor, then remove the motor.

CHECK POINT

üüüü

When assembling, hook the spring to the tension lever assembly first, then fasten the screw.

Screw (No.6)

CR Damper Shafts ;B (No.8)

Torsion Sprin

g

Tension Lever Assembly

Motor (CR) As s emb ly

Bottom of the Scanner Facing Upward

Figure 4-13. CR Motor Assembly Removal

GT-12000 Disassembly and Assembly

Rev. A

4-11

4.2.3.5 Glass Frame Assembly Removal and Pre-operation

Since the glass frame assembly is one of the reinforcing parts of the mechanism, whole mechanism may be deformed if it is removed. Be sure to follow the instruction provided in this section during any service which involves removing the glass frame assembly.

CAUTION

Be aware the following when removing the document glass during any service:

n

n n

n Always set the scanner on the adjusting tools

exclusively designed for this scanner.

n

n n

n Set the scanner on a stable, level table. n

n n

n Make sure that the scanner mechanism is

installed to the lower housing while servicing.

n

n n

n Be sure to fit all the rubber foot at the bottom

of the scanner in the top indents of the stages and the adjuster. (Any of the foot must not be placed over the top surface of the tool.)

1. Remove the upper housing. (See Section 4.2.2.1.)

2. Refer to the figures in the right column and set the adjusting tools (leveling tools) under the scanner to level the scanner, as instructed below:

1) Set the scanner on 3 stages, making each of the specified feet of

the scanner sit on the corresponding stage.

2) Set the adjuster under the rubber foot in the front right corner of the

scanner bottom, aligning the center of the adjuster with the one of the rubber foot. Make sure that you can see the groove on the adjuster when it is set.

3) Hold the base of the adjuster with a hand and spin the table to

make it reach the bottom of the scanner by its own forth.

4) Turn the table

[2 quarters]

manually, which can be measured by 4 divisions on the table and the groove on the base, to push the table up from the position where the table was moved up to by the spin.

5) After adjusting, make sure that each corner of the scanner is securely in contact with the corresponding tool.

Note: Directions are described when the scanner is viewed from the front.

Stage

(3 pieces)

Adjuster

Turning Table (w ith 4 devisions)

Base (w it h1 groove)

Figure 4-14. Adjusting Tools

Stage (S et in the front left, rear

right and rear left coners.)

Adjuster (S et in the front right coner.)

Turn the turning table to m o v e th e ta b le u p and dow n to adjust height.

Figure 4-15. Tool Position and Adjusting Method

GT-12000 Disassembly and Assembly

Rev. A

4-1

2

3. Remove 9 screws and remove the glass frame assembly. The screws

to be removed and their locations are as follows:

· No.4: 5 screws securing the glass frame assembly by the right and left sides.

· No.1: 2 screws securing the glass frame assembly by the rear edge.

· No.3: 2 screws securing the glass frame assembly by the front edge.

Note: Directions are described when the scanner is viewed from

the front.

CAUTION

When reinstalling the glass frame assembly, refer to Section 4.2.3.5.1 to set the glass frame assembly on the correct position. Failure in this operation will cause the CR to start scanning at a wrong position.

Screws (No.1)

Screws (No.4)

Screws (No.3)

Front Side of the Scanner

Glass Frame Assembly

Screws (No.4)

Glass Fixing Plate (Color : Silve)

Figure 4-16. Glass Frame Assembly Removal

GT-12000 Disassembly and Assembly

Rev. A

4-1

3

4.2.3.5.1 Glass Frame Assembly Installation

After the glass frame assembly has been removed for any purpose, it must be reinstalled in the following procedure.

1. Place the glass frame assembly to the specified position in the scanner mechanism.

2. Referring to the Figure 4-17, determine the installation position for the glass frame assembly.

1) Push the whole glass frame assembly from the front against the

positioning bushes (color: silver) on the top side of the rear frame. (Glass edge is in contact with the bushes with this operation.)

2) Keeping the glass frame assembly in contact with the bushes, move

the assembly left to push it against the positioning bump on the top surface of the left side frame.

3. When the glass frame assembly is correctly positioned, fix it with 9 screws.

CHECK POINT

üüüü

When installing the glass frame assembly, ensure that 4 glass fixing plates are properly positioned. (See Figure 4-16.)

G lass Fram e A ssem bly

Scanner Front S ide

G lass edge

Positioning Bush (C olor: S ilver)

Fram e P ositioning Bum p

Figure 4-17.

Determining the Glass Frame Assembling Installation position

GT-12000 Disassembly and Assembly

Rev. A

4-1

4

4.2.3.6 Lamp Assembly and Inverter Board Assembly Removal

This section describes how to remove the lamp assembly and the inverter board assembly from the carriage.

1. Remove the glass frame assembly. (See Section 4.2.3.5.)

2. Move the CR to the position indicated in Figure 4-19. (The position where the front and rear frames are indented.)

3. Remove 2 screws (No.6) securing the carriage mirror cover and slide the cover toward the rear side of the scanner to release the engagement with the hook on the carriage. Then lift up the cover and remove it.

Screws (No.6)

CR Mirror Cover

Figure 4-18. CR Mirror Cover Removal

GT-12000 Disassembly and Assembly

Rev. A

4-1

5

4. Disconnect the connector cable for the lamp from the connector CN2 on the inverter board assembly. Then remove the lamp from the carriage.

5. Disconnect the cable (black) from the connector CN1 on the inverter board assembly. Then remove the bracket (silver) fixing the ferrite core.

6. Remove 2 screws (No.6) securing the inverter board assembly.

7. Slide the inverter board assembly toward the front side of the scanner to release the engagement with the hook on the carriage. Then remove the inverter board.

CHECK POINT

üüüü

When assembling, make sure that the cover is securely engaged with the hook on the carriage.

Hook

Cover

C arriage Base

Rear

Front

Lift up to remove.

Cut Part of the Board

Screws (No.6)

Lamp

Inverter Board

CN1

CN2

Figure 4-19.

Lamp Assembly and Inverter Board Assembly Removal

GT-12000 Disassembly and Assembly

Rev. A

4-1

6

4.2.3.7 HP (AF) Sensor Removal

This section describes the procedure for removing the HP sensor which detects the reference position for the AF drive mechanism (lens/CCD sensor unit).

1. Remove the glass frame assembly. (See Section 4.2.3.5.)

2. Remove 4 screws (No.3) securing the AF drive mechanism cover which covers the AF drive mechanism and remove the cover.

3. Rotate the screw pulley at the end of the screw shaft (a thread shaf t) manually to move the detection flag to the area where it does not overlap with the HP sensor.

4. Release the hook fixing the HP sensor and remove it, then disconnect the cable from the sensor.

Screws (No.3)

Cover

Figure 4-20. AF Drive Mechanism Cover Removal

Rotate this pulley manually.

HP Sensor (AF)

Detection Flag

Figure 4-21. HP Sensor (AF) Removal

GT-12000 Disassembly and Assembly

Rev. A

4-1

7

4.2.3.8 AF Motor Assembly Removal

This section describes how to remove the motor which drives AF drive mechanism.

1. Remove the glass frame assembly. (See Section 4.2.3.5.)

2. Remove 4 screws (No.3) and remove the cover which covers the AF drive mechanism.

3. Remove 2 screws (No.6) and remove the tension plate assembly, spring plate and fixing tension plate to loosen the timing belt.

4. Disconnect the cable for the motor from the relay connector, then remove 4 screws (No.4) securing the motor and remove the motor.

Screws (No.6)

Tension Plate Assembly

Fixing Tension Plate

Spring Plate

Figure 4-22. Tension Plate Assembly Removal

Screws (No.4)

Motor Assembly (AF)

Figure 4-23. AF Motor Assembly Removal

CAUTION

You are required to set the timing belt with a special care while installing the AF motor assembly. Be sure to follow the instruction provided in the next page to set the timing belt peoperly.

GT-12000 Disassembly and Assembly

Rev. A

4-1

8

4.2.3.9 AF Motor Assembly Installation

Follow the steps below when installing the AF motor assembly to the scanner body.

1. Engaging the timing belt with the pinion gear of the motor, install the motor to the frame with 2 screws (No. 4).

2. Mount the sprint plate, fixing tension plate, and the tension plate assembly, and fix them with 2 screws (No. 6) temporarily. Ensure that the tension plate assembly is upheld by this operation.

3. Turning the screw pulley attached to the screw shaft end manually, loosen the screw fixing the tension plate assembly to tense the belt, then fasten the screw again.

CAUTION

When fixing the tension plate assembly, be careful not to apply excessive tension, since it may cause the motor to rotate improperly.

Fixing Tension Plate

Spring Plate

Tension Plate A ssem bly

Screws (N o. 6)

Figure 4-24. Tension Plate Assembly

CHECK POINT

üüüü

When installing the tension plate assembly, make sure that the location bump is not covered with the plate.

Tension Plate A ssem bly

Screw Pulley

(rotated counterclockwise)

Figure 4-25. Timing Belt Tension

ADJUSTMENT

CHAPTER

5

GT-12000 Adjustment

Rev. A

5-1

5.1 OVERVIEW

This scanner requires no adjustment for any service such as disassembling and assembling the scanner including part replacement is provided within the specification in Chapter 4 “Disassemble and Assembly”.

MAINTENANCE

CHAPTER

6

GT-12000 Maintenance

Rev. A

6-1

6.1 OVERVIEW

This chapter provides information necessary to keep the scanner function in optimum condition constantly and to prevent troubles.

6.1.1 Cleaning

Perform cleaning when stain is noticeable. Stain on the document glass, particularly, has direct effect on scanned image. Therefore, be sure to clean the glass well to remove stain thoroughly.

CAUTION

Never apply any organic solvent such as thinner and benzine , since these may deteriorate plastic and rubber parts.

q Outer cases

Wipe stain off with a clean cloth which is moistened with water and then squeezed tightly. To remove severe stain, use neutral detergent.

q Document glass

Remove dust and paper debris with a dry clean cloth. If stain is severe or foreign matter is stuck, use a cloth absorbed with neutral detergent. If trace is left, wipe it off well with a dry, clean cloth again.

CAUTION

If you need to clean the reverse side of the glass, be sure to remove the glass using the specified adjusting tools.

6.1.2 Lubrication

This scanner needs no lubrication at the level of service specified in the service manual.

APPENDIX

CHAPTER

7

GT-12000 Appendix

Rev. A

7-1

7.1 OVERVIEW

This chapter provides information necessary for servicing.

7.1.1 Connector Pin Assignment

CN3

CN2 CN4 CN7

CN5

CN6

CN1

CN5

CN4

CN1

CN2

CN2 CN1

CN3 CN6

Scanner M echanism

B054M A IN Board

B054P S H Board

SCSI I/F SCSI I/F

O p tio n a l I/F

AC Input

Bi-directional I/F

B054S U B Board

B054PN L

Board

H P S ensor

(M irro r)

Motor

(M irro r)

Motor

(A F )

H P S ensor

(A F )

B054IS N

Board

Figure 7-1. Connector Pin Assignment

7.1.2 Connector Summary

Connectors used on the electrical circuit boards are summarized in the table below.

Table 7-1. Connector Summary

Board

CN

No.

Function Ref.

B054MAIN CN1/3 For connection with SCSI I/F GT-9500

CN2 For connection with Bi-directional I/F GT-9500 CN4

For connection with B054SUB Board (In a card-edge format)

Page 7-2

CN5

Power supply line from the B054PSH board

Page 7-3

CN6 For connection with the option Page 7-3

B054PSH CN1 For connection with AC inlet –

CN2

ðPower supply line for B054MAIN board

Page 7-3

B054SUB

CN1

ðFor connection to B054MAIN board

Page 7-2

CN2

ðFor connection to B054ISN board (CCD sensor, Inverter board)

Page 7-4 CN3 ðFor connection to B054PNL board Page 7-4 CN4

ðFor connection to the HP sensor (for focus)

Page 7-4 CN5

ðFor connection to the motor (for mirror)

Page 7-4 CN6

ðFor connection to HP sensor (for mirror)

Page 7-5 CN7

ðFor connection to the motor (for focus)

Page 7-5

GT-12000 Appendix

Rev. A

7-

2

B054MAIN – CN4

No. Signal Name Function

A1 GND GND A2 GND GND A3 ADD2 Address (2) A4 ADD0 Address (0) A5 A/D AD clock A6 WR WR signal for ADC A7 CLP Clamp signal for ADC A8 SG Shutter (Green) for CCD

A9 RSP Reset signal for CCD A10 TG Shift signal for CCD A11 AD1 Image data (1) after AD conversion A12 AD3 Image data (3) after AD conversion A13 AD5 Image data (5) after AD conversion A14 AD7 Image data (7) after AD conversion A15 AD9 Image data (9) after AD conversion A16 AD11 Image data (11) after AD conversion A17 GND GND A18 RESETSW Reset SW signal A19 LED(R) LED (READY) signal A20 +5 Power supply (+5V) A21 GND GND A22 LAMP Lamp signal A23 +24 Power supply (+24V) A24 GND GND A25 HMF(P) Home sensor (AF) (Power supply) A26 MFA Motor (AF) (Phase A) A27 MFAX Motor (AF) (Phase /A) A28 HMM(S) Home sensor (Mirror) (Signal) A29 MMB Motor (Mirror) (Phase B) A30 MMBX Motor (Mirror) (Phase /B) A31 GND GND

No. Signal Name Function

B1 +5V Power supply (+5V) B2 +12V Power supply (+12V) B3 ADD1 Address (1) B4 STLN Start line signal for ADC B5 CSAP Chip select ADC B6 SMP Sample hold signal for ADC B7 SB Shutter (Blue) for CCD B8 SR Shutter (Red) for CCD

B9 CK Clock signal for CCD B10 AD0 Image data (0) after AD conversion B11 AD2 Image data (2) after AD conversion B12 AD4 Image data (4) after AD conversion B13 AD6 Image data (6) after AD conversion B14 AD8 Image data (8) after AD conversion B15 AD10 Image data (10) after AD conversion B16 GND GND B17 POWERSW Power switch (secondary side) B18 LED(P) LED (POWER) B19 LED(ER) LED (ERROR) B20 GND GND B21 GND GND B22 +24 Power supply (+24V) B23 +24 Power supply (+24V) B24 HMF(S) Home sensor (AF) (Signal) B25 MFB Motor (AF) (Phase B) B26 MFBX Motor (AF) (Phase /B) B27 GND GND B28 HMM(P) Home sensor (Mirror) (Power supply) B29 MMA Motor (Mirror) (Phase A) B30 MMAX Motor (Mirror) (Phase /A) B31 GND GND

GT-12000 Appendix

Rev. A

7-

3

B054MAIN – CN5

No. Signal Name Function

1 +24V Power supply (for motor drive, lamp) 2 +24V Power supply (for motor drive, lamp) 3 +24V Power supply (for motor drive, lamp) 4 GND GND 5 GND GND 6 GND GND 7 +5V Power supply (for logic line) 8 +5V Power supply (for logic line)

9 +15V Power supply (for producing +12V) 10 GND GND 11 TMP Output from the thermistor 12 SW Power switch (Secondary side) control signal

B054MAIN – CN6

No. Signal Name Function

1 IN1 TPU (HOME) / Select 2 IN2 TPU (COVER) / Select 3 IN3 Not used. 4 OU5 Lamp control signal 5 IN4 Not used. 6 +5 Power supply (+5V) 7 GND GND 8 +24 Power supply (+24V)

9 SDAT Motor drive serial data for TPU 10 SCK Transfer clock for TPU 11 LOD Latch pulse for TPU 12 SEL Select signal for TPU 13 +5 Power supply (+5V) 14 GND GND 15 +24 Power supply (+24V) 16 +24 Power supply (+24V) 17 GND GND 18 +5 Power supply (+5V) 19 +5 Power supply (+5V) 20 +24 Power supply (+24V) 21 RXD RXD signal for ADF 22 /RXD /RXD signal for ADF 23 /TXD /TXD signal for ADF 24 TXD TXD signal for ADF 25 DSR DSR signal for ADF 26 DTR DTR signal for ADF

GT-12000 Appendix

Rev. A

7-

4

B054SUB – CN2

No. Signal Name Function

1 +12 Power supply (+12V) 2 GND GND 3 +5 Power supply (+5V) 4 GND GND 5 +5 Power supply (+5V) 6 GND GND 7 +12V Power supply (+12V) 8 S2 Address (2)

9 S1 Address (1) 10 S0 Address (0) 11 STL Start line for ADC 12 A/D AD clock 13 CS Chip select signal 14 WR WR signal for ADC 15 SMP Sample hold signal for ADC 16 CLP Clamp signal for ADC 17 SB Shutter signal (Blue) for CCD 18 SG Shutter signal (Green) for CCD 19 SR Shutter signal (Red) for CCD 20 RSP Reset signal for CCD 21 CK Clock signal for CCD 22 TG Shift signal for CCD 23 AD0 Image data (0) after AD conversion 24 AD1 Image data (1) after AD conversion 25 AD2 Image data (2) after AD conversion 26 AD3 Image data (3) after AD conversion 27 AD4 Image data (4) after AD conversion 28 AD5 Image data (5) after AD conversion 29 AD6 Image data (6) after AD conversion 30 AD7 Image data (7) after AD conversion 31 AD8 Image data (8) after AD conversion 32 AD9 Image data (9) after AD conversion 33 AD10 Image data (10) after AD conversion 34 AD11 Image data (11) after AD conversion 35 GND GND

B054SUB – CN3

No. Signal Name Function

1 +24 Power supply (+24V) 2 +24 Power supply (+24V) 3 +24 Power supply (+24V) 4 +24 Power supply (+24V) 5 LAMP Lamp signal 6 GND GND 7 GND GND 8 GND GND

9 GND GND 10 +5V Power supply (+5V) 11 LED (ERR) LED (ERROR) 12 LED (RES) LED (READY) 13 LED (POW) LED (POWER) 14 RESETSW RESET switch signal 15 POWERSW POWER switch signal 16 GND GND

B054SUB – CN4

No. Signal Name Function

1 HMF(S) Home sensor (AF) (Signal)

2 GND GND

3 HMF(P) Home sensor (AF) (Power supply)

B054SUB – CN5

No. Signal Name Function

1 MFB Motor (AF) (Phase B drive signal)

2 MFA Motor (AF) (Phase A drive signal)

3 MFBX Motor (AF) (Phase /B drive signal)

4 MFAX Motor (AF) (Phase /A drive signal)

GT-12000 Appendix

Rev. A

7-

5

B054SUB – CN6

No. Signal Name Function

1 HMM(S) Home sensor (Mirror) (Signal) 2 GND GND 3 HMM(P) Home sensor (Mirror) (Power supply)

B054SUB – CN7

No. Signal Name Function

1 MMB Motor (Mirror) (Phase B drive signal) 2 MMA Motor (Mirror) (Phase A drive signal) 3 MMBX Motor (Mirror) (Phase /B drive signal) 4 MMAX Motor (Mirror) (Phase /A drive signal)

GT-12000 Appendix

Rev. A

7-

6

7.2 COMPONENT LAYOUT

Figure 7-2. Component Layout - B054MAIN Board

GT-12000 Appendix

Rev. A

7-

7

Figure 7-3. Component Layout - B054PSH Board

GT-12000 Appendix

Rev. A

7-

8

7.3 CIRCUIT DIAGRAMS

1 2 3 4 5 6 7 8 9 10

TP5

DIRECT

I

3O1

G N D

2

SR3 78M12

R208

1K

R209

4.7K

R210

1K

1

2

3

Q2 C4116

C75

0.1U

C77

0.1U

Q3

2SJ191

B16 BLM 121

C70 10U/16V

B46 BLM121

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

CN3

SCSI

1 2

CN9 FAN

C76

0.1U

SD0 SD1 SD2 SD3 SD4 SD5 SD6 SD7 SDP

SATN

SBSY

C22

0.1U

VDD

13

VDD

14

GND

7

VM

24

NC

1

NC

25

SL1

8

SL2

9

SL3

10

SL4

11

SL5

12

SL6

15

SL7

16

SL8

17

SL9

18

SL10

19

SL11

20

SL12

21

SL13

22

SL14

23

SL15

3

SL16

4

SL17

5

SL18

6

EN

2

IC1 6

BH9595FP

D1 RB160L

B17 BLM 121

B18 BLM 121

B19 BLM 121

B20 BLM 121

B21 BLM 121

B22 BLM 121

B23 BLM 121

B24 BLM 121

B25 BLM 121

B26 BLM 121

B28 BLM 121

B29 BLM 121

B27 BLM 121

B47 BLM121

B48 BLM 121

B49 BLM121

B50 BLM121

B51 BLM121

B52 BLM121

B53 BLM121

B54 BLM121

B55 BLM121

B56 BLM121

B57 BLM121

B58 BLM121

B59 BLM121

GIO

GCD

GMSG

GACK

GREQ

GBSY

GSEL

GDP

GD7

GD6

GD5

GD4

GD3

GD2

GD1

GD0

GD1

GD2

GD3

GD4

GD5

GD6

GD7

GDP

GSEL

GBSY

GREQ

GACK

GMSG

FD0

FD1

FD2

FD3

FD4

FD5

FD6

FD7

FDP

FSEL

FBSY

FREQ

FACK

FMSG

FD0

FD1

FD2

FD3

FD4

FD5

FD6

FD7

FDP

FSEL

FBSY

FREQ

FACK

FMSG SMSG

SACK

SREQ

SBSY

SSEL

SDP

SD7

SD6

SD5

SD4

SD3

SD2

SD1

SD0

C25

2.2U

C53

2.2U

G D 5

G D 4

G D 3

G D 2

G D 1

G D 0

G C D

G I O

G S E L

G B S Y

G R E Q

G A C K

G M S G

G A T N

G R S T

123

CR3

20MHz

1

TP4

DRMER

1

TP3

BRCPU

1

TP2

DRCPU

VDD

17

VDD

32

VDD

49

VDD

62

VDD

81

VDD

97

VSS

87

VSS

85

VSS

83

VSS

80

VSS

78

VSS

76

VSS

16

VSS

33

VSS

48

VSS

56

VSS

61

VSS

64

VSS

66

VSS

68

VSS

70

VSS

72

VSS

74

BDDRQ

28

DM6

37

DM7

36

BDDAK

30

DRMER

29

BRCPU

35

DRCPU

31

I N T I F

1 0 6

EOLID2

104

LODID3

105

S C K I

1 0 1

T X D

1 0 9

S C K O

1 0 8

SH3

115

SH2

114

SH1

111

SH0

110

RWID0

102

RESI

34

NMI

116

A0

11

A1

10

A2

9

A3

8

A4

7

A5

6

A6

5

A7

4

AH

22

D 0

2 1

D 1

2 0

D 2

1 9

D 3

1 8

D 4

1 5

D 5

1 4

D 6

1 3

D 7

1 2

C S

2 3

R D

2 4

W R

2 5

A S

2 6

C S M E R

2 7

C S R O M I

1 2 3

C S R A M I

1 2 2

C S R A M O

1 1 9

O E R A M O

1 1 8

S T R B

5 8

D I R I

5 7

ITID 1

103

B U S Y

5 9

A C K

6 0

P 7

4 4

P 6

4 5

P 5

4 6

P 4

4 7

P 3

5 0

P 2

5 1

P 1

5 2

P 0

5 3

C S A P

1 2 6

RESMR

117

DM0

43

DM1

42

DM2

41

DM3

40

DM4

39

DM5

38

A8

3

A9

2

D B P

6 5

D B 7

6 7

D B 6

6 9

D B 5

7 1

D B 4

7 3

D B 3

7 5

D B 2

7 7

D B 1

7 9

D B 0

8 2

S E L

8 4

B S Y

8 6

R E Q

8 8

A C K

9 0

M S G 1

9 2

C / D

9 4

I / O

9 6

A T N

9 9

R S T

6 3

X I N

1

X O U T

1 2 8

IDSEL

107

D P R T

5 4

MINTEST

55

VDD

113

VDD

124

TEST1

120

TEST2

121

MONIT1

127

VSS

89

VSS

91

VSS

93

VSS

95

VSS

98

VSS

100

VSS

112

VSS

125

IC2 8

GGIF

IFD 7 IFD 6 IFD 5 IFD 4 IFD 3 IFD 2 IFD 1 IFD 0

IFD A

IFD R

G D P

G D 7

G D 6

DRMER

IFD 7 IFD 6 IFD 5 IFD 4 IFD 3 IFD 2 IFD 1 IFD 0

IFD A

IFD R

A0

9

A1

10

A2

11

A3

12

A4

14

A5

15

A6

16

A7

17

A8

18

RAS

4

CAS

23

WE

3

OE

22

D0

1

D1

2

D2

24

D3

25

VCC

13

GND

26

A9

5

IC1 0

DRAM1M*4

A0

9

A1

10

A2

11

A3

12

A4

14

A5

15

A6

16

A7

17

A8

18

RAS

4

CAS

23

WE

3

OE

22

D0

1

D1

2

D2

24

D3

25

VCC

13

GND

26

A9

5

IC1 1

DRAM1M*4

C30

0.1U

C34

0.1U

C35

0.1U

A 0

1 2

A 1

1 1

A 2

1 0

A 3

9

A 4

8

A 5

7

A 6

6

A 7

5

A 8

2 7

A 9

2 6

A 1 0

2 3

A 1 1

2 5

A 1 2

4

A 1 3

2 8

A 1 4

3

D 0

1 3

D 1

1 4

D 2

1 5

D 3

1 7

D 4

1 8

D 5

1 9

D 6

2 0

D 7

2 1

C E 2

3 0

O E

2 4

W E

2 9

V D D

3 2

G N D

1 6

A 1 5

3 1

A 1 6

2

C E 1

2 2

R F S H

1

IC2 3

PSRAM128K*8

C33

0.1U

A 0

1 2

A 1

1 1

A 2

1 0

A 3

9

A 4

8

A 5

7

A 6

6

A 7

5

A 8

2 7

A 9

2 6

A 1 0

2 3

A 1 1

2 5

A 1 2

4

A 1 3

2 8

A 1 4

3

D 0

1 3

D 1

1 4

D 2

1 5

D 3

1 7

D 4

1 8

D 5

1 9

D 6

2 0

D 7

2 1

C E 2

3 0

O E

2 4

W E

2 9

V D D

3 2

G N D

1 6

A 1 5

3 1

A 1 6

2

C E 1

2 2

R F S H

1

IC2 0

PSRAM128K*8

R224 47K

R225 47K

R226 47K

R227 47K

M C E

M O E

BRW

BCAS

BRAS

BRW

BCAS

BRAS

MBA9

MBA8

MBA7

MBA6

MBA5

MBA4

MBA3

MBA2

MBA1

MBA0

MBA9

MBA8

MBA7

MBA6

MBA5

MBA4

MBA3

MBA2

MBA1

MBA0 M BD0

MBD1 MBD2 MBD3

MBD4 MBD5 MBD6 MBD7

M A 0

M A 1

M A 2

M A 3

M A 4

M A 5

M A 6

M A 7

M A 8

M A 9

M A 1 0

M A 1 1

M A 1 2

M A 1 3

M A 1 4

M A 1 5

M A 1 6

M 3 D 0

M 3 D 1

M 3 D 2

M 3 D 3

M 3 D 4

M 3 D 5

M 3 D 6

M 3 D 7

M 3 D 8

M 3 D 9

M 3 D 1 0

M 3 D 1 1

M W E 3

C28

0.1U

C29

0.1U

A 0

1 2

A 1

1 1

A 2

1 0

A 3

9

A 4

8

A 5

7

A 6

6

A 7

5

A 8

2 7

A 9

2 6

A 1 0

2 3

A 1 1

2 5

A 1 2

4

A 1 3

2 8

A 1 4

3

D 0

1 3

D 1

1 4

D 2

1 5

D 3

1 7

D 4

1 8

D 5

1 9

D 6

2 0

D 7

2 1

C E 2

3 0

O E

2 4

W E

2 9

V D D

3 2

G N D

1 6

A 1 5

3 1

A 1 6

2

C E 1

2 2

R F S H

1

IC2 1

PSRAM128K*8

A 0

1 2

A 1

1 1

A 2

1 0

A 3

9

A 4

8

A 5

7

A 6

6

A 7

5

A 8

2 7

A 9

2 6

A 1 0

2 3

A 1 1

2 5

A 1 2

4

A 1 3

2 8

A 1 4

3

D 0

1 3

D 1

1 4

D 2

1 5

D 3

1 7

D 4

1 8

D 5

1 9

D 6

2 0

D 7

2 1

C E 2

3 0

O E

2 4

W E

2 9

V D D

3 2

G N D

1 6

A 1 5

3 1

A 1 6

2

C E 1

2 2

R F S H

1

IC2 2

PSRAM128K*8

C32

0.1U

C31

0.1U

A 0

1 2

A 1

1 1

A 2

1 0

A 3

9

A 4

8

A 5

7

A 6

6

A 7

5

A 8

2 7

A 9

2 6

A 1 0

2 3

A 1 1

2 5

A 1 2

4

A 1 3

2 8

A 1 4

3

D 0

1 3

D 1

1 4

D 2

1 5

D 3

1 7

D 4

1 8

D 5

1 9

D 6

2 0

D 7

2 1

C E 2

3 0

O E

2 4

W E

2 9

V D D

3 2

G N D

1 6

A 1 5

3 1

A 1 6

2

C E 1

2 2

R F S H

1

IC1 8

PSRAM128K*8

A 0

1 2

A 1

1 1

A 2

1 0

A 3

9

A 4

8

A 5

7

A 6

6

A 7

5

A 8

2 7

A 9

2 6

A 1 0

2 3

A 1 1

2 5

A 1 2

4

A 1 3

2 8

A 1 4

3

D 0

1 3

D 1

1 4

D 2

1 5

D 3

1 7

D 4

1 8

D 5

1 9

D 6

2 0

D 7

2 1

C E 2

3 0

O E

2 4

W E

2 9

V D D

3 2

G N D

1 6

A 1 5

3 1

A 1 6

2

C E 1

2 2

R F S H

1

IC1 9

PSRAM128K*8

R217 47K

R218 47K

R220 47K

R221 47K

R222 47K

R223 47K

R219 47K

R216 47K

M C E

M O E

M A 0

M A 1

M A 2

M A 3

M A 4

M A 5

M A 6

M A 7

M A 8

M A 9

M A 1 0

M A 1 1

M A 1 2

M A 1 3

M A 1 4

M A 1 5

M A 1 6

M A 0

M A 1

M A 2

M A 3

M A 4

M A 5

M A 6

M A 7

M A 8

M A 9

M A 1 0

M A 1 1

M A 1 2

M A 1 3

M A 1 4

M A 1 5

M A 1 6

M 1 D 0

M 1 D 1

M 1 D 2

M 1 D 3

M 1 D 4

M 1 D 5

M 1 D 6

M 1 D 7

M 1 D 8

M 1 D 9

M 1 D 1 0

M 1 D 1 1

M 2 D 8

M 2 D 9

M 2 D 1 0

M 2 D 1 1

M 2 D 0

M 2 D 1

M 2 D 2

M 2 D 3

M 2 D 4

M 2 D 5

M 2 D 6

M 2 D 7

M W E 1

M W E 2

A0

9

A1

10

A2

11

A3

12

A4

14

A5

15

A6

16

A7

17

A8

18

RAS

4

CAS

23

WE

3

OE

22

D0

1

D1

2

D2

24

D3

25

VCC

13

GND

26

A9

5

IC7

DRAM1M*4

A0

9

A1

10

A2

11

A3

12

A4

14

A5

15

A6

16

A7

17

A8

18

RAS

4

CAS

23

WE

3

OE

22

D0

1

D1

2

D2

24

D3

25

VCC

13

GND

26

A9

5

IC9

DRAM1M*4

C37

0.1U

C38

0.1U

LRW

LCAS

LRAS

LCAS

LRAS

LRW

MLA3

MLA2

MLA1

MLA0

MLA9

MLA8

MLA7

MLA6

MLA5

MLA4

MLA3

MLA2

MLA1

MLA0

MLA9

MLA8

MLA7

MLA6

MLA5

MLA4

MLD4 MLD5 MLD6 MLD7

MLD8 MLD9 MLD10 MLD11

Q S T B

1 2 3 4 5 6 7 8

9 10 11 12

CN5

POWER

1 3

2

FL1

NF101

1 3

2

FL2 NF101

R278 47K

1

TP1 TG

C40

100U/35V

C1

0.1U

B1 102

B2 102

D

12Q 9

C

1 3

P

1 0

CK

11

Q

8

IC3 6 B

74F74

D

2Q 5

C

1

P

4

CK

3

Q

6

IC4 0 A

74F74

D

12Q 9

C

1 3

P

1 0

CK

11

Q

8

IC4 0 B

74F74

TG SHF

S T R

S T G

S T B

Q S T R

Q S T G

M X 1

I3O

1

G N D

2

SR2 78M12

C73

100U/35V

C74

100U/35V

R211

4.7K R212

10K

C78

0.1U

1 3

2

FL3 NF101

1 3

2

FL4

NF101

1 3

2

FL5 NF101

1 3

2

FL6 NF101

1 3

2

FL7

NF101

1 3

2

FL8 NF101

1 3

2

FL9 N F101

1 3

2

FL10 N F101

B3 102

B4 102

B5 102

B6 102

B7 102

B8 102

B9 102

B10 102

C121 330P

SFR

SFG

SFB

CLPF

SFH

WRAD

CSAD

SR

SG

SB

RSP

CK

SMP

CLP

TEMP

CKF

RSF

CSADC

WRADC

C39

0.1U

R214 47K

R215 47K

C80

0.1U

R228 10

R229 10

R230

10

A817Y8

3

A715Y7

5

A613Y6

7

A511Y5

9

A4 8Y4

12

A3 6Y3

14

A2 4Y2

16

A1 2Y1

18

2G

19

1G

1

+5

20

GND

10

IC3 3

74HC244

A817Y8

3

A715Y7

5

A613Y6

7

A511Y5

9

A4 8Y4

12

A3 6Y3

14

A2 4Y2

16

A1 2Y1

18

2G

19

1G

1

+5

20

GND

10

IC3 2

74HC244

R272 47K

R273 47K

LRW

LCAS

LRAS

MLD11 MLD10 MLD9 MLD8 MLD7 MLD6 MLD5 MLD4 MLD3 MLD2 MLD1

MLA9

MLA8

MLA7

MLA6

MLA5

MLA4

CLK2

CLP2

SFR SFG SFB CLPF SFH

SH

CLK1

RS

CLP1 S&H

L R A S

L C A S

L R W

SHF CKF RSF

MX2

LCMP

QSTR QSTG QSTB

AD7

172

AD6

173

AD5

174

AD4

175

AD3

176

AD2

177

AD1

178

AD0

179

H V D D

1 1 9

H V D D

1 0 5

V S S

1 1 2

V S S

9 2

AD8

171

AD9

170

AD10

169

AD11

168

ADCK

155

SH

149

STR

150

STG

151

STB

152

SNCK1(CLK)

158

SNCK1X(CLKX)

159

SNCK2(RS)

160

SNCK3(CLP1)

153

SNCK4(CLP2)

154

SNCK5(S&H)

161

CS1

162

CS0

163

LCMP

164

LMP

166

LMPO

167

MLA0

147

MLA1

146

MLA2

145

MLA3

144

MLA4

143

MLA5

141

MLA6

140

MLA7

139

MLA8

138

MLA9

137

MLD0

135

MLD1

134

MLD2

133

MLD3

132

MLD4

131

MLD5

130

MLD6

128

MLD7

127

MLD8

126

MLD9

125

MLD10

124

MLD11

123

LRAS

122

LCAS

121

LRW

120

M A 0

1 1 8

M A 1

1 1 7

M A 2

1 1 6

M A 3

1 1 5

M A 4

1 1 4

M A 5

1 1 3

M A 6

1 1 1

M A 7

1 1 0

M A 8

1 0 9

M A 9

1 0 8

M A 1 0

1 0 7

M A 1 1

1 0 6

M A 1 2

1 0 3

M A 1 3

1 0 2

M A 1 4

1 0 1

M A 1 5

1 0 0

M A 1 6

9 9

M 1 D 0

9 8

M 1 D 1

9 7

M 1 D 2

9 6

M 1 D 3

9 5

M 1 D 5

9 3

M 1 D 6

9 1

M 1 D 7

9 0

M 1 D 8

8 9

M 1 D 9

8 8

M 1 D 1 0

8 7

M 1 D 1 1

8 6

M 2 D 0

8 5

M 2 D 1

8 4

M 2 D 2

8 3

M 2 D 3

8 2

M 2 D 4

8 1

M 2 D 5

8 0

M 2 D 6

7 8

M 2 D 7

7 7

M 2 D 8

7 6

M 2 D 9

7 5

M 2 D 1 0

7 4

M 2 D 1 1

7 3

M 3 D 0

7 2

M 3 D 1

7 1

M 3 D 2

7 0

M 3 D 3

6 9

M 3 D 4

6 8

M 3 D 5

6 7

M 3 D 6

6 5

M 3 D 7

6 4

M 3 D 8

6 3

M W E 1

5 7

M O E

5 6

M C E

5 5

MBA0

54

MBA1

51

MBA2

50

MBA3

49

MBA4

48

MBA5

47

MBA6

46

MBA7

45

MBA8

43

MBA9

42

MBA10

41

MBA11

40

MBA12

39

MBA13

38

MBA14

37

MBA15

36

MBA16

35

MBD0

33

MBD1

32

MBD2

31

MBD3

30

MBD4

29

MBD5

28

MBD6

26

MBD7

25

MBD8

24

MBD9

23

MBD10

22

MBD11

21

BRAS

19

BCAS

20

BRW

18

P S

1 8 2

R S

1 8 3

I N T

1 8 4

E O L

1 8 5

C S

1 8 6

R D

1 8 7

W R

1 8 8

A 7

1 9 8

A 6

1 9 9

A 5

2 0 0

A 4

2 0 1

A 3

2 0 2

A 2

2 0 3

A 1

2 0 4

A 0

2 0 5

D 7

1 8 9

D 6

1 9 0

D 5

1 9 1

D 4

1 9 2

D 2

1 9 5

D 1

1 9 6

D 0

1 9 7

D R

2 0 6

D A

2 0 7

I/FD 7

16

I/FD 6

15

I/FD 5

14

I/FD 4

13

I/FD 3

11

I/FD 2

10

I/FD 1

9

I/FD 0

8

I/FD A

6

I/FD R

7

S L C K

1 6 5

R E

1 8 1

OSCO

4

OSCI

2

D 3

1 9 4

V S S

1 2 9

V S S

3

V S S

1 2

V S S

2 7

V S S

4 4

V S S

5 2

V S S

6 6

L V D D

1 3 6

H V D D

1 4 8

L V D D

7 9

L V D D

1 5 7

H V D D

1 7

H V D D

5 3

M 3 D 9

6 2

M 3 D 1 0

6 1

M 3 D 1 1

6 0

M 1 D 4

9 4

M W E 2

5 8

M W E 3

5 9

TEST

5

V S S

1 0 4

V S S

1 4 2

V S S

1 5 6

V S S

1 8 0

L V D D

3 4

L V D D

1

H V D D

1 9 3

V S S

2 0 8

IC2 4

MERCURY

M A 1 6

M A 1 5

M A 1 4

M A 1 3

M A 1 2

M A 1 1

M A 1 0

M A 9

M A 8

M A 7

M A 6

M A 5

M A 4

M A 3

M A 2

M A 1

M A 0

M 1 D 0

M 1 D 1

M 1 D 2

M 1 D 3

M 1 D 4

M 1 D 5

M 1 D 6

M 1 D 7

M 1 D 8

M 1 D 9

M 1 D 1 0

M 2 D 0

M 2 D 1

M 2 D 2

M 2 D 3

M 2 D 4

M 2 D 5

M 2 D 6

M 2 D 7

M 2 D 8

M 2 D 9

M 2 D 1 0

M 2 D 1 1

M 3 D 0

M 3 D 1

M A 0

M A 1

M A 2

M A 3

M A 4

M A 5

M A 6

M A 7

M A 8

M A 9

M A 1 0

M A 1 1

M A 1 2

M A 1 3

M A 1 4

M A 1 5

M A 1 6

M A 0

M A 1

M A 2

M A 3

M A 4

M A 5

M A 6

M A 7

M A 8

M A 9

M A 1 0

M A 1 1

M A 1 2

M A 1 3

M A 1 4

M A 1 5

M A 1 6

M 1 D 1 1

A0

9

A1

10

A2

11

A3

12

A4

14

A5

15

A6

16

A7

17

A8

18

RAS

4

CAS

23

WE

3

OE

22

D0

1

D1

2

D2

24

D3

25

VCC

13

GND

26

A9

5

IC1 2

DRAM1M*4

C36

0.1U

BRW

BCAS

BRAS

MBA9

MBA8

MBA7

MBA6

MBA5

MBA4

MBA3

MBA2

MBA1

MBA0 M BD8

MBD9 MBD10 MBD11

M 3 D 2

M 3 D 3

M 3 D 4

M 3 D 5

M 3 D 6

M 3 D 7

M 3 D 8

M 3 D 9

M 3 D 1 0

M 3 D 1 1

M A 0

M A 1

M A 2

M A 3

M A 4

M A 5

M A 6

M A 7

M A 8

M A 9

M A 1 0

M A 1 1

M A 1 2

M A 1 3

M A 1 4

M A 1 5

M A 1 6

MBA0 MBA1 MBA2 MBA3 MBA4 MBA5 MBA6 MBA7 MBA8 MBA9

M C E

M O E

M W E 3

M W E 2

M W E 1

D7D6D5D4D3D2D1D

0

ASWRRDC S 2

C S M E R

A19 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

LED(E) LED(R)

DRCPU

C S A P

C23

47U/16V

C71

0.1U

S T R B

D I R

B U S Y

A C K

B D 7

B D 6

B D 5

B D 4

B D 3

B D 2

B D 1

B D

0 C S 0

C S 1

C S R A M

O E R A M

RESMR

NMI

PWRES

RWID0

ITID 1 EOLID2 LODID3

E O L I D 2

L O D I D 3

I N T I F

SELID

S C K O

1/3AD

S D A T

C24

0.1U

TH

6

CV

5

GND

1

TRG

2

OUT

3

DCH

7

V+

8

RST

4

IC2 9

NJM555

C69

0.1U

C68

0.1U

R181 470

R180

3.3K

R194 10

B30 BLM 121

B31 BLM 121

B32 BLM 121

B33 BLM 121

B60 BLM121

B61

BLM121

B62 BLM121

B63 BLM121

C88 22P

C89 22P

C90 22P

C91 22P

C92 22P

C93 22P

C94 22P

C95 22P

C96 22P

C97 22P

C109

22P

C110 22P

C111 22P

C112 22P

C113 22P

C114 22P

C115

22P

C116

22P

GRST

R W I D 0

I T I D 1

GATN

GCD

GIO

GATN

GRST

F C D

F I O

FCD

FIO

FATN

FRST

FCD

FIO

FATN

FRST SRST

SATN

SIO

SCD

F D 0

F D 1

F D 2

F D 3

F D 4

F D 5

F D 6

F D 7

F D P

F S E L

F B S Y

F R E Q

F A C K

F M S G

F A T N

F R S T

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

CN1

SCSI

SACK SRST SMSG SSEL SCD SREQ SIO

SD0 SD1 SD2 SD3 SD4 SD5

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

CN2

Bi-Di

1 2 4 8

C1

C2

SW2

SCSI ID

1 2 3

SW1

TM SW

ID0 ID1 ID2 ID3

SD6 SD7 SDP

SATN

SBSY SACK SRST SMSG SSEL SCD SREQ SIO

R87

3.3K R88

3.3K

R89 10K

R90 10K

R91 10K

R92 10K

R93 10K

R94 10K

R95 10K

R96 10K

C20

150P

R105 10K

R106

10K

R107 10K

R85

3.3K R86

3.3K

C18

150P

C19 150P

C21 150P

R104

10K

R98 1K

R99 10K

R102 1K

R103 1K

R101 1K R100 1K

R97

3.3K

C119 47U/16V

R281 47K

B66

BL02RN1

ID0 ID1 ID2 ID3

SRST

R66 10 R67 10 R68

10

R69

10 R70 10 R71 10

R182

47K

R183 47K

C17 150P

1 A

2

1 Y

4

1 B

3

2 A

5

2 Y

7

2 B

6

3 A

1 1

3 Y

9

3 B

1 0

4 A

1 4

4 Y

1 2

4 B

1 3

A / B

1

G

1 5

G N D

8

V C C

1 6

IC2 5

74LS157

R231 47K R232 47K R233 47K R234 47K R235 47K R236 47K

R193 47K

C106 1000P

R84

330

1 2

3

J1

J/3

D C 0

D C 1

D C 2

D C 3

D C 4

D C 5

D C 6

D C 7

CS2 CS1 CS0

AS RD WR

M F B I 1

M F A P a

M F B P a

INIT

LOD

RSSW

INT M E R INT IF

EOL

CS2 CS1 CS0 AS RD WR

P60/WAIT

66

A 0

4 5

A 1

4 6

A 2

4 7

A 3

4 8

A 4

4 9

A 5

5 0

A 6

5 1

A 7

5 2

A 8

5 4

A 9

5 5

A 1 0

5 6

A 1 1

5 7

A 1 2

5 8

A 1 3

5 9

A 1 4

6 0

A 1 5

6 1

A 1 6

6 2

A 1 7

6 3

A 1 8

6 4

A 1 9

6 5

P 5 4 / A 2 0

9 5

P 5 5 / A 2 1

9 6

P 5 6 / A 2 2

9 7

P 5 7 / A 2 3

9 8

P 4 0 / D 0

2 7

P 4 1 / D 1

2 8

P 4 2 / D 2

2 9

P 4 3 / D 3

3 0

P 4 4 / D 4

3 1

P 4 5 / D 5

3 2

P 4 6 / D 6

3 3

P 4 7 / D 7

3 4

D 8

3 6

D 9

3 7

D 1 0

3 8

D 1 1

3 9

D 1 2

4 0

D 1 3

4 1

D 1 4

4 2

D 1 5

4 3

P61/BREQ

67

P62/BACK

68

P90/TXD0

20

P91/TXD1

21

P92/RXD0

22

P93/RXD1

23

P94/SCK0/IRQ4

24

P95/SCK1/IRQ5

25

PA0/TP0/TEND0/T

105

PA1/TP1/TEND1/T

106

PA2/TP2/TIOCA0/

107

PA3/TP3/TIOCB0/

108

PA4/TP4/TIOCA1

109

PA5/TP5/TIOCB1

110

PA6/TP6/TIOCA2

111

PA7/TP7/TIOCB2

112

PB0/TP8/TIOCA3

2

PB1/TP9/TIOCB3

3

PB2/TP10/TIOCA4

4

PB3/TP11/TIOCA4

5

PB4/TP12/TOCXA4

6

PB5/TP13/TOCXB4

7

PB6/TP14/DREQ0

8

PB7/TP15/DREQ1

9

A V C C

8 4

V R E F

8 5

V C C

1

V C C

4 4

V C C

7 6

V S S

1 0

V S S

2 6

V S S

3 5

V S S

5 3

V S S

7 3

V S S

9 9

A V S S

9 4

P 7 0 / A N 0

8 6

P 7 1 / A N 1

8 7

P 7 2 / A N 2

8 8

P 7 3 / A N 3

8 9

P 7 4 / A N 4

9 0

P 7 5 / A N 5

9 1

P 7 6 / A N 6

9 2

P 7 7 / A N 7

9 3

P C 0

1 1

P C 1

1 2

P C 2 / T E N D 2 / C S 4

1 3

P C 3 / D R E Q 2 / C S 5

1 4

P C 4 / T E N D 3 / C S 6

1 5

P C 5 / D R E Q 3 / C S 7

1 6

P C 6 / I R Q 6

1 7

P C 7 / I R Q 7

1 8

P80/RFSH/IRQ0

100

P81/CS3/IRQ1

101

P82/CS2/IRQ2

102

P83/CS1/IRQ3

103

P84/CS0

104

AS

77

RD

78

HWR

79

LWR

80

MD0

81

MD1

82

MD2

83

STBY

70

NMI

72

RES

71

RESO

19

EXTAL

74

XTAL

75

FAI

69

IC1 3

HD6413003TF

R263 47K

R264

47K

R282 47K

A C 1 9

A C 1 8

A C 1 7

A C 1 6

A C 1 5

A C 1 4

A C 1 3

A C 1 2

A C 1 1

A C 1 0

A C 9

A C 8

A C 7

A C 6

A C 5

A C 4

A C 3

A C 2

A C 1

A C 0

LOD

M F A I 0

M F A I 1

M F B I 0

P 5 4

P 5 5

P 5 6

P 5 7

SLCK

EOL

RE

TXD0

RXD0

1/3AD

STLN

DSR0 DTR0

R198 10

R199 10

R200 10

R201 10

R202 10

R203 10

R204 10

R205 10

R206 10

R207 10

R240 10 R241 10 R242 10

2 4

IC3 9

TC7SU04F

BRAS BCAS BRW

MBD0 MBD1 MBD2 MBD3 MBD4 MBD5 MBD6 MBD7 MBD8 MBD9 MBD10 MBD11

IFD 7 IFD 6 IFD 5 IFD 4 IFD 3 IFD 2 IFD 1 IFD 0

IFD A IFD R

C81

0.1U

D

2Q 5

C

1

P

4

CK

3

Q

6

IC3 6 A

74F74

C87

5P

12

IC3 1A

74LS04

34

IC3 1B

74LS04

AD11 AD10 AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2 AD1

MLD0

MLA9 MLA8 MLA7 MLA6 MLA5 MLA4 MLA3 MLA2 MLA1 MLA0

ADCK SH STR STG STB CLK1

RS CLP1 CLP2 S&H

CLK2

ADCK

AB2 AB1 AB0

A2 A1 A0

CSAP

WR

STLN

D0 D1 D2 D3 D4 D5 D6 D7

ADCF CSAD

STAD

CSAP

RD

SH

WRAD

MX1 MX1

MX2

LCMP

A1 B1 A2 B2 A3 B3 A4 B4 A5 B5 A6 B6 A7 B7 A8 B8 A9 B9 A10 B10 A11 B11 A12 B12 A13 B13 A14 B14 A15 B15 A16 B16 A17 B17 A18 B18 A19 B19 A20 B20 A21 B21 A22 B22 A23 B23 A24 B24 A25 B25 A26 B26 A27 B27 A28 B28 A29 B29 A30 B30 A31 B31

CN4

62PIN

C79

0.1U

A8 9B8

11

A7 8B7

12

A6 7B6

13

A5 6B5

14

A4 5B4

15

A3 4B3

16

A2 3B2

17

A1 2B1

18

G

19

DIR

1

+5

20

GND

10

IC3 4

74F245

1 3

2

FL15

NF101

1 3

2

FL14 N F101

1 3

2

FL13 NF101

1 3

2

FL11

NF101

1 3

2

FL12

NF101

C6

0.1UC50.1U

C67

100U/35V

B11 102

B12 102

B13 102

B14 102

B15 102

AD10

AD9

AD8

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

TG

SMP

ADCF

STAD

A/D

CLP SB SG SR RSP CK

ADD2 ADD1 ADD0

ADD2

ADD1

ADD0

AB2

AB1

AB0

AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7

STLAD

CSADC WRADC

C50

0.1U

C52 150P

R4 1K

R5

4.7K

1

2

3

Q1 C4116

C49 150P

C51 150P

R140

180 1/4W

1

2 3

Q5

A1586

R268

4.7K

C107 150P

C60

0.1U

R138 470 1/4W

R139

75 1/4W

AD11

MFB MFA MFBX MFAX

HMF(S) HMF(P)

MMAX

HMM(S) HMM(P)

MMBX

MMB MMA

LED(E)

LED(R)

+5

POWERSW RESETSW LED(POWER) LED(READY) LED(EROOR)

PHASE

8

VSS

6

1

7

0

9

A

15

B

1

PT

2

VS

3

GND

4

GND

5

GND

12

GND

13

VS

14

SR

16

CI

10

REF

11

IC5

TEA3718

C56 820P

C65

10U/16V

I

3O2

G N D

1

SR1

LT1117-3.3

1

2

3

IC3 7 A

74F08

D

2Q 5

C

1

P

4

CK

3

Q

6

IC3 5 A

74F74

D

12Q 9

C

1 3

P

1 0

CK

11

Q

8

IC3 5 B

74F74

AD0

MFB MFBX

OU5

1/3AD

PHASE

8

VSS

6

1

7

0

9

A

15

B

1

PT

2

VS

3

GND

4

GND

5

GND

12

GND

13

VS

14

SR

16

CI

10

REF

11

IC6

TEA3718

C58 820P

C62 10U/16V

R269

200

C66

2.2U

C61

2.2U

D0D1D

2

MFAI0

MFAPaMFBPa

MFBI0

MFA MFAX

C S M E R

RDW

R S L C K

REE

O L

R E S M R

I N T M E R

P S

3.3V

R3 10K

R2

330

R168 10

R167

47K

12 3

CR2

24MHz

R141 1M

R142

10

A0A1A2A3A4A5A6A7D3D4D5D6D

7

RSSW

DRMER

A0

12

A1

11

A2

10

A3

9

A4

8

A5

7

A6

6

A7

5

A8

27

A9

26

A10

23

A11

25

A12

4

A13

28

A14

3

D0

13

D1

14

D2

15

D3

17

D4

18

D5

19

D6

20

D7

21

CE2

30

OE

24

WE

29

VDD

32

GND

16

A15

31

A16

2

CE1

22

RFSH

1

IC1 7

PSRAM128K*8

C3

2.2U C2

2.2U

A0 A1 A2 A3 A4

D0 D1 D2 D3 D4

I N 1

I N 2

I N 3

I N 4

MMAPb

MMAI2 MMAI3 MMBPa MMBPb

MMAPa

SEL PS

MMAI0 MMAI1

M M B I 0

M M B I 1

M M B I 2

M M B I 3

D R C P U

D R M E R

A0

12

A1

11

A2

10

A3

9

A4

8

A5

7

A6

6

A7

5

A8

27

A9

26

A10

23

A11

25

A12

4

A13

28

A14

29

A15

3

A16

2

D0

13

D1

14

D2

15

D3

17

D4

18

D5

19

D6

20

D7

21

CE

22

OE

24

VP

1

PGM

31

VDD

32

GND16NC

30

IC1

PROM1M/3

C16 1000P

C7

150P

R213

47K

R137 47K

1

2

3

CR1

16MHz

R83 330

A0 A1 A2 A3 A4

D0 D1 D2 D3 D4

STRB BD0 BD1 BD2 BD3 BD4 BD5 BD6 BD7 ACK BUSY INIT DIR

H O M E 2

H O M E 1

I N 1

NMI

PWRES

T E M P

R75 68

R82 68

R113

10K

R114

10K

R115

10K

R116

10K

R117

10K

R118

10K

R119

10K

R120

10K

R121

10K

R72

68

R73 68

R74

68

R76 68

R77 68

R78

68

R79 68

R80 68

R81 68

C13 150P

C10

150P

C8

150P

C9

150P

C11

150P

C12 150P

C14 150P

C15

150P

R108 68 R109 68

B35 BLM121 B36 BLM121

B34 BLM121

B37 BLM121 B38 BLM121 B39 BLM121

B41 BLM121

B40 BLM121

B42 BLM121 B43 BLM121

IN1

IN1 IN2 IN3

OU5

LOD SEL

I N 2

I N 3

I N 4

O U 5

L O D

S E L

IN4

S C K O

SCKO

SDAT

S D A T

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26

CN6

OPTION

RXD /RX D TXD /TX D DSR DTR

C98

0.1U

C108

100U/35V

R173 4.7K

R172 4.7K

R174 220

1

2

3

Q4 C4116

R176 4.7K

R175

1K

R238 1K

R239

4.7K

D3

1SS294

D4

1SS294

D5

1SS294

D2

1SS294

R9 68 R8 68 R7 68 R6 68

R112 68

R110 68 R111 68

C99 150P

C100

0.1U

B44 BLM 121 B45 BLM 121

SEL

LOD

IN2 IN3

IN4

OU5

SCKO

SDAT

R10

47K R11 47K R12 47K R13

47K R14 47K R15 47K R16 47K R17

47K

R18

10

R19

10

R20

10

R21

10

R22

10

R23

10

R24

10

R25

10

C26

0.1U

/Z

6

Y

5

RO

2

DI

3/B7

VCC

1

GND

4

A

8

IC3 8

SN75179B

C85

0.1U

A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16

D5 D6 D7

DC0 DC1 DC2 DC3 DC4 DC5 DC6 DC7

D0 D1 D2 D3 D4 D5 D6 D7

CS0 RD

TXD0

RXD0

DSR0

DTR0

R26

10

R27

10

R28

10

R29

10

R30

10

R31

10

R32

10

R33

10

R34

10

R35

10

R36

10

R37

10

R38

10

R39

10

R40

10

R41

10

R42

10

R43

10

R44

10

R45

10

R46 47K

R47 47K

R48 47K

R49 47K

R50 47K

R51 47K

R52 47K

R53 47K

R54 47K

R55 47K

R56 47K

R57 47K

R58 47K

R59 47K

R60 47K

R61 47K

R62 47K

R63 47K

R64 47K

R65 47K

C27

0.1U

R163

10K

R164

10K

R166

10K

R165

10K

A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16

D5 D6 D7

AC0 AC1 AC2 AC3 AC4 AC5 AC6 AC7 AC8 AC9 AC10 AC11 AC12 AC13 AC14 AC15 AC16

A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16

A17AC17 AC18 AC19

A18

A19

A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 A18 A19

CSRAM

WR

OERAM

P54

P55

P56

P57

C4 150P

C45

0.1U

C63

0.1U

C64

0.1U

R190 560

ZD3

HZU2.0B

C46

0.1U

IN

7

OUT

6

NC

2

GND

4

C

5

NC

1

NC

3

NC

8

IC2

M51953AFP

R276 47K

R279 10

R280 10

SCL

6

SDA

5

NC

1

NC

2

NC

3

NC

7

VCC

8

GND

4

IC2 6

AT24C01

SCL

6

SDA

5

NC

1

NC

2

NC

3

NC

7

VCC

8

GND

4

IC2 7

AT24C01

P54 P55

P56 P57

PWRES

0.5V

INA

3

INB

2

8

14

4

13

2

12

1

11

OSC

4

A

8

B

6

NF

5

VI

7

VR

1

VCC

10

GND

9

IC3

TA7289P

R129 200

C48

2.2U/50V

R130

1.2 2W

C55

3300P

C59 820P

R151 10K R152

10K R153 10K R154 10K R155 10K R156 10K

R157 10K R158 10K R159 10K R160 10K

R149

1K

R147 47K

R192 1KF

R189

3KF

R148

0.68 1W

R275 2

MMAPa MMAPb

MMBPa MMBPb

MMAI0 MMAI1 MMAI2 MMAI3

MMBI0 MMBI1 MMBI2 MMBI3

MFAI1MFBI1

MMA

MMAX

MFAPa MFBPa MFAI0 MFAI1 MFBI0 MFBI1

MMAPa MMAPb MMBPa MMBPb

INA

3

INB

2

8

14

4

13

2

12

1

11

OSC

4

A

8

B

6

NF

5

VI

7

VR

1

VCC

10

GND

9

IC4

TA7289P

R123 10K

R124 10K

C41 150P

C42

0.1U

C43

0.1U

C44 150P

R126 10K

R127 10K

R128 200

C47

2.2U/50V

R131

1.2 2W

C57 820P

R125

150 1/4W

R122

150 1/4W

R145

1K

R144

47K

R146

0.68 1W

R274 2

D8

SFPB-66V

D9

SFPB-66V

D12

SFPB-66V

D13

SFPB-66V

MMB

MMBX

HOME1

HOME2HMF(S)

HMF(P)

HMM(S)

HMM(P)

M M B

M M B X

M M B

M M B X

D6

SFPB-66V

D7

SFPB-66V

D10

SFPB-66V

D11

SFPB-66V

M M A

M M A X

4

5

6

IC3 7 B

74F08

9

10

8

IC3 7 C

74F08

12

13

11

IC3 7D

74F08

56

IC3 1C

74LS04

98

IC3 1D

74LS04

11 10

IC3 1E

74LS04

13 12

IC3 1F

74LS04

For IC31(VCC-GND)

For IC35(VCC-GND)

For IC36(VCC-GND)

For IC37(VCC-GND)

For IC40(VCC-GND)

C72

0.1U

C83

0.1U

C84

0.1U

C86

0.1U

C120

0.1U

Figure 7-4. B054MAIN Board Circuit Diagram

GT-12000 Appendix

Rev. A

7-

9

GND

1 2 3 4 5 6 7 8 9 10 11 12

CN2

+24V

FG

L51 LP201-2R5SD

*1

R53

ZD55 HZS6A-1L

R59

4.75K 1%

R81

84.5K

R60 10K

R58

200K C59

390P

*1

D51

FCH20A10

2

4

T1 PT-98

10

C15

3900P/2KV

C11 470U/250V

D31

10DF 6

R34

100K/2W

1

3

2

4

DB1

D5SB60

C8

1000P

TH2 10

TH3

10

TH4

10 TH 1

10

TH5

10

TH6

10

C14

2200P

D2

11EQS04

C32

470U/250V

D32

10DF 6

R35

100K/2W

R12

0.68/2W

Q1

K1985 *1

ZD1

RD120E

R18 82K/0.5W

R28 82K/0.5W

5

3

6

11

12

C88 2200p

C52

ZD51

HZS5C-1

ZD81

HZS6B-2

C51 C53

2200U/35V

X3

R61 30

+ I 1

1

I 1

2

F B

3

D T C

4

C T

5

R T

6

G N D

7

C 1

8

+ I 2

1 6

I 2

1 5

R O

1 4

O C

1 3

V C C

1 2

C 2

1 1

E 2

1 0

E 1

9

IC 5 1

494

R51

6.3V

C54

470U

R64

1K

D55 31DQ 04

Q51 A1469

R88

0.2/0 .5W X2

R52

390/2W X2

PSC

+5V +15V

TEM P

GND

TH51 103AT-2

R65

24K

C58

0.01u

R63

3.6K

R66 200K

R67 3K

ZD82

HZS5C-1

ZD83

HZS6B-2

D56

10ELS2

I

3

O

1

C

2

IC 5 2

78M 15 *1

D1

11EQS06

7

13

C13

4700P

Q2 C4408

R15 510

R11

1.3K

Q3

A1015Y

R31

1 M /0 .5 W

R19

10K

Q31

K1482

FG

C5

2200PC62200P

FG

C2 0.1U

C3

1000PC41000P

1

2 3 4

L2

HF 2835-802Y2R 0

R32

39K

C31

1000P

R29

1.5M /0.5W

R22

1.5M /0.5W

R14 510

R13

4.7K

R16 270

2

1

3

IC 1

TL431

C12

100U

25V

R33

100K

15

14

C55

0.33U

C82

1000U/35V

Q82

C1815

R83 10K

C60 22U/50V

C87 220U/10V

C89

0.1U

ZD91

HZS18-1

R85 470K

ZD88

HZS5ALL

ZD53

HZS9A1

R84 39K

Q84

K1398

R86 150

C84

0.1U

R82

300

ZD87

HZS12C2

ZD52

HZS12C2

D86 11EQS04

D83

1SS120

R87 1K

R55 39K

Q83

DTA113ZS

R56 150

D52

10ELS2

R57 150

8

1

2

4

3

PC1

TLP721F

16

R21

4.7K

R20

2.4K

C1 0.47 U

FG

C7 0.22 U

1

2 3 4

L1

HF 2835-802Y2R 0

R1

1 M /0 .5 W

F2 T3.15AH /250V

F1 T3.2A/250V

ZD31

HZS9A1L

R68 10K

1

2

4

3

PC2

TLP721F

ZD90 HZS20-2

R69

1.5K/0.5W

D81

1SS120Q81

DTA115ES

*1:W ith H eatsink

1234567

C33

100U/25V

C34

4.7U/400V

C35

0.1U

C36

0.047U

IC2 M K 1210 *1

D33 ERB44-10

R37 33/2W

R36

30/3W

LN

1

2

CN1

220-240VA C

100-120VA C

Figure 7-5. B054PSH Board Circuit Diagram

GT-12000 Appendix

Rev. A

7-1

0

7.4 EXPLODED DIAGRAMS

Figure 7-6. Exploded Diagrams (1)

GT-12000 Appendix

Rev. A

7-11

Figure 7-7. Exploded Diagrams (2)

SERVICE MANUAL

ADF (Auto Document Feeder)

4008512

®

NOTICE

mechanical, photocopying, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.

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

n The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.

EPSON is a registered trademark of SEIKO EPSON CORPORATION. General Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their respective

owners. EPSON disclaims any and all rights in those marks.

PRECAUTIONS

Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment.

DANGER

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

WARNING

Signals a precaution which, if ignored, could result in damage to equipment.

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

DANGER

1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES.

2. NOWORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIER WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS TECHNICIANS IN THEIR LINE OF WORK.

3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. W HEN THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION I N WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.

WARNING

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

2. MAKE CERTAIN THAT T HE SOURCE VOLTAGES IS THE SAME AS THE RAT ED VOLTAGE, LISTED ON T HE SERIAL NUMBER/RATING PLATE. I F THE EPSON PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POW ER SOURCE, DO NOT CONNECT IT T O THE POW ER SOURCE.

3. ALWAYS VERIFY THAT T HE EPSON PRO DUCT HAS BEEN DISCO NNECT ED FROM THE PO WER SOURCE BEFORE REMOVING OR REPLACI NG PRINTED CIRCUIT BOARDS AND/OR INDIVIDUAL CHIPS.

4. I N ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUI TRY, USE STATIC DISCHARGE EQUI PMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN ACCESSING INTERNAL COMPONENTS.

5. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF SECONDSOURCE ICs OR OTHER NONAPPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.

PREFACE

This manual describes basic functions, theory of electr ical and mechanical operations, maintenance and repair procedures of ADF. The instructions and procedures included herein are intended for the experienced repair technicians, and attention should be g iven to the precaution s on the preceding page. T he chapters are organized as follows:

CHAPTER 1. PRODUCT DESCRIPTIONS

Provides a general overview and specifications of the product.

CHAPTER 2. OPERATING PRINCIPLES

Describes the theory of electrical and mechanical operations of the product.

CHAPTER 3. TROUBLESHOOTING

Provides the step-by-step procedures for troubleshooting.

CHAPTER 4. DISASSEMBLY AND ASSEMBLY

Describes the step-by-step procedures for disassembling and assembling the product.

CHAPTER 5. ADJUSTMENTS

Provides Epson-approved methods for adjustment.

CHAPTER 6. MAINTENANCE

Provides preventive maintenance procedures and the lists of Epson-approved lubricants and adhesives required for servicing the product.

APPENDIX

Provides the following additional information for reference:

• Connector pin assignments

• Electric circuit boards components layout

• Exploded diagram

• Electrical circuit boards schematics

REVISION STATUS

Rev. Date Page(s) Contents

A 1997/10/20 All First release

TABLE OF CONTENTS

PRODUCT DESCRIPTIONS

1.1 FEATURES....................................................................................................................................................................1-1

1.2 PRODUCT DESCRIPTION............................................................................................................................................1-1

OPERATING PRINCIPLES

2.1 OVERVIEW....................................................................................................................................................................2-1

2.1.1 ADF Mechanism..................................................................................................................................................................................2-1

2.1.2 Electrical Circuit ...............................................................................................................................................................................2-12

2.1.2.1 Transmission Circuit................................................................................................................................................................2-12

2.1.2.2 Paper Size Detection Circuit ...................................................................................................................................................2-13

2.1.2.3 Document Sensor (Empty Sensor) Circuit...............................................................................................................................2-13

2.1.2.4 Paper Feeding Motor Encoder Sensor Circuit.........................................................................................................................2-14

2.1.2.5 Registration Sensor Circuit......................................................................................................................................................2-14

2.1.2.6 Sensor Circuits........................................................................................................................................................................2-15

2.1.2.7 Switch Circuits.........................................................................................................................................................................2-16

2.1.2.8 Reset Circuit............................................................................................................................................................................2-16

2.1.2.9 Paper Feed Motor Driver Circuit..............................................................................................................................................2-17

2.1.2.10 Transportation/Paper Eject/Reverse Motor Driver Circuits.............................................................................................2-18

2.1.2.11 Feeding Solenoid/Reverse Solenoid Sensor Circuits ............................................................................................................2-19

2.1.2.12 Rush Current Limitation Circuit .............................................................................................................................................2-19

2.1.2.13 EEPROM Transmission/Write Circuit....................................................................................................................................2-20

TROUBLESHOOTING

3.1 OVERVIEW....................................................................................................................................................................3-1

3.1.1 Test Mode Overview...........................................................................................................................................................................3-1

3.1.1.1 Single Feeding Test Mode ........................................................................................................................................................3-2

3.1.1.2 Reverse Feeding Test Mode.....................................................................................................................................................3-2

3.1.1.3 Single Feeding Without Paper Aging Test Mode ......................................................................................................................3-3

3.1.1.4 Reverse Feeding Without Paper Aging Test Mode...................................................................................................................3-3

3.1.1.5 Motor Line Output Test Mode....................................................................................................................................................3-4

3.1.1.6 Solenoid Line Output Test Mode...............................................................................................................................................3-4

3.1.2 Motor/Solenoid Internal Coil Resistance..........................................................................................................................................3-5

3.1.2.1 Transportation Motor Check Points...........................................................................................................................................3-5

3.1.2.2 Paper Eject/Reverse Motor Check Point...................................................................................................................................3-6

3.1.2.3 Solenoid Check Point................................................................................................................................................................3-6

3.1.2.4 Paper Size Sensor ....................................................................................................................................................................3-6

DISASSEMBLY AND ASSEMBLY

4.1 OVERVIEW....................................................................................................................................................................4-1

4.1.1 Tools....................................................................................................................................................................................................4-1

4.1.2 Screws................................................................................................................... ..............................................................................4-1

4.2 DISASSEMBLY PROCEDURE......................................................................................................................................4-2

4.2.1 Paper Feed Tray Removal..................................................................................................................................................................4-2

4.2.2 Control Board Unit Removal..............................................................................................................................................................4-3

4.2.3 Transportation Belt Unit Removal.....................................................................................................................................................4-4

4.2.4 Paper Feed Unit Removal...................................................................................................................................................................4-5

4.2.5 Paper Eject/Reverse Unit Removal ...................................................................................................................................................4-6

4.2.6 Transportation Belt Drive Motor Removal........................................................................................................................................4-7

4.2.7 Paper Feed Motor Unit Removal........................................................................................................................................................4-8

4.2.8 Registration/Timing Sensor Removal...............................................................................................................................................4-9

4.2.9 Paper Eject/Reverse Motor Unit Removal.......................................................................................................................................4-10

4.2.10 Paper Eject Sensor Removal.........................................................................................................................................................4-11

ADJUSTMENT

5.1 OVERVIEW....................................................................................................................................................................5-1

5.1.1 Adjustment Tools................................................................................................................................................................................5-1

5.1.2 Mechanical Adjustment......................................................................................................................................................................5-1

5.1.2.1 Flapper Solenoid Installation Position Adjustment....................................................................................................................5-2

5.1.2.2 Separation Plate Gap Adjustment.............................................................................................................................................5-3

5.1.2.3 Belt Tension Adjustment...........................................................................................................................................................5-4

5.1.2.4 Magnet Catch Installation Position Adjustment.........................................................................................................................5-4

5.1.2.5 Micro Switch Installation Position Adjustment...........................................................................................................................5-5

5.1.2.6 Skew Correction Adjustment.....................................................................................................................................................5-6

5.1.3 Electrical Adjustment.........................................................................................................................................................................5-7

5.1.3.1 Sensor Adjustment....................................................................................................................................................................5-8

5.1.3.2 EEPROM Initialize and Sensor Adjustment ..............................................................................................................................5-9

5.1.3.3 Scan Stop Position Adjustment.................................................................................................................................................5-9

MAINTENANCE

6.1 OVERVIEW....................................................................................................................................................................6-1

6.1.1 Cleaning...............................................................................................................................................................................................6-1

6.1.1.1 Cleaning Points.........................................................................................................................................................................6-2

6.1.2 Lubrication..........................................................................................................................................................................................6-7

6.1.3 Adhesion ...........................................................................................................................................................................................6-15

APPENDIX

7.1 CONNECTOR TABLE ...................................................................................................................................................7-1

7.2 EXPLODED DIAGRAMS...............................................................................................................................................7-3

PRODUCT DESCRIPTIONS

CHAPTER

1

ADF Product Description

Rev. A

1-1

1.1 FEATURES

This auto document feeder (ADF) is the exclusive ADF for GT-12000, and its main features are as follows:

q Supports large document up to A3 size q Page transportation system

Document is transported page by page for each scanning operation

q Supports duplex feeding function

- Document is automatically reversed for scanning.

1.2 PRODUCT DESCRIPTION

BASIC SPECIFICATION

Type: Page transportation & duplex scanning type Document transportation: - Document center aligning

- Fed faced-up from the bottom

- Face-up ejection

Document replacement time:1.2 seconds (A4/LT landscape) Loading plural sizes: Unavailable (Size of the document in a stack

must be the same.)

Noise: 50dB or less

ADF Product Description

Rev. A

1-

2

Accuracy in top position: Single feed: 0 - +2 mm

Duplex feed: 0 - +2 mm

Center alignment: Single feed: +1.5 mm

Duplex feed: +3 mm

Document skew: Single feed: +1.5 mm

Duplex feed: +3 mm * Center alignment = (C+D)/2

* Skew amount = (A-B)x200/L

A

B

C

D

L

D ocum ent

D ocum ent G lass

Figure 1-1. Paper Feed Accuracy

DOCUMENT SUPPORTED

Document size: [Portrait] A3, LD, B4, LG, A4, LT, B5, A5,

140X148 mm / 5.5 x 5.8 inch

[Landscape] A4, LT, B5, A5

Feeding capacity: 50 sheets (80 g/m

2

)

- A4 landscape/portrait

- LT landscape/portrait or smaller 30 sheets (80 g/m

2

)

- B4, LG or larger Ejecting capacity: 100 sheets Applicable document [Paper Type]

- High quality paper

- Average quality paper

- Ink-jet paper (fine/super fine equivalent)

- Bond paper

[Paper thickness] 50 - 127 g/m

2

Document whose thickness is more than 110g/m

2

is applicable in the normal condition* only. (Normal condition : 15 - 25° C, 40 - 70%).

Inapplicable document: - Tracing paper, Coating paper, Pasted

paper, Label paper, OHP film, Carbon paper, Catalogue paper, Special paper including rice paper

- Stapled paper, Clipped paper

- Paper with many holes (ex, loose-leaf paper)

- Paper with rip, curl and bent

ADF Product Description

Rev. A

1-

3

ELECTRICAL SPECIFICATION

Power supply: Supplied through the scanner

- DC24V ± 10%

- DC5V ± 10%

Consumption current: DC24V = 2.0A

DC5V = 0.3A

Insulation resistance: 10 mW or more at DC500V

(Between AC line and chassis)

Dielectric strength: AC1000V per minute

(Between AC line and chassis)

Resistance to static electric noise: Case = Operated properly at 10KV or less

Metal =Operated properly at 7KV or less

ENVIRONMENTAL CONDITION

Temperature: - Operation = 5 - 35°C

- Storage = -25 - 60°C

Humidity: - Operation = 10 - 80% *

- Storage = 10 - 85% *

* Without condensation

Resistance to vibration: - Operation = 0.2G / 5 - 55Hz

in X,Y,Z directions

- Storage = 2G / 5 - 55Hz in X,Y,Z directions

Dropping test: Height = 62 cm / 24.2 inch*

* When packed.

RELIABILITY

Paper feeding life: 100,000 sheets Paper ejecting life: 100,000 sheets Hinge: 100,00 close motions or more

SAFETY, EMC

Safety regulations: - UL1950

- CSA950

- FCC

CE Marking: - Directive 89/336EEC, 92/31 EEC

- Directive 73/23 EEC

OPERATING CONDITION

Environment: Ordinal office or home conditions.

(Place with extreme dust should be avoided.)

ADF Product Description

Rev. A

1-

4

APPEARANCE

Weight: 16Kg or less Dimensions (W x D x H): 601 x 529 x 122 mm / 23.6 x 20.8 x 4.8 inch

(with the extension tray stored.)

601 m m / 23.6 inch

529 m m / 20.8 inch

122 m m

4.8 inch

147 m m

5.8 inch

Figure 1-2. External Dimensions of the ADF

OPERATING PRINCIPLES

CHAPTER

2

ADF Operating Principles

Rev. A

2-1

2.1 OVERVIEW

This chapter gives information on operating principles of the ADF which can be used with the EPSON scanner GT-12000. The contents of this chapter are as follows:

Section 2.1.1: ADF mechanism

q Single feeding q Reverse feeding

Section 2.1.2: Electrical Circuit

q Sensor circuits q Reset circuits q Driver circuits q Rush current limitation circuit q EEPROM write circuit

2.1.1 ADF Mechanism

See Figure 2-1 which shows major mechanism parts of the ADF and their locations. In both Single/Reverse feeding modes, docum ent is picked up at the paper feed tray and is then transported in the ADF and eject ed to the output tray. This process is described step by step t horough out the section. Descriptions for single and reverse feedings are given separately. As you follows the steps, make sure that you refer to Figure 2-1 for exact locations of the parts and their functions.

Em pty Sensor

Separation R oller

D ocum ent S hutter

D ocum ent W eight

H alf-m oon Roller

Paper Feed Tray

Paper Feed Roller

R egistration R oller

R egistration S ensor

Tim ing S ensor

D ocum ent W eight

Platen G lass

Transportation Belt

O u tp u t T ra y

Eject R oller

Flapper

Paper Eject/ Reverse Roller

Paper Eject/ R everse Sensor

Paper Feed M otor (fo rw a rd )

W ait S hutter Solenoid

Paper Feed M otor (backward)

Transportation M otor (forw ard/backward)

Flapper Solenoid

Paper Eject/R everse M otor (fo rw a rd on ly)

Figure 2-1. Major Mechanism Parts and Their Locations

ADF Operating Principles

Rev. A

2-

2

SINGLE FEEDING

In single feeding mode, the ADF loads document from the paper feed t ray and transports it to the scanning position, then ejects it immediately af ter scanning. Therefore, document must be always transported in single direction to let the ADF repeat feeding/ejecting operation cycle.

Setting document

1. Document is set in the paper feed tray.

Pre-feeding

"Pre-feeding" means the sequence in which the ADF transports document from the paper feed tray to the scanning position according to the single feed command sent from the scanner.

2. When the wait shutter solenoid turns on, the document is picked up and transported from the paper feed tray by the forward rotation of the paper feed motor. The motor then stops rotating when the registration sensor comes on. This sequence, from picking up the document to the registration sensor's coming on, is called registration operation. The transportation motor and the paper eject/reverse motor also rotate forward to perform dummy ejection to prevent a remaining document from jamming when the ADF is feeding another document. This is performed for every feeding motion no matter a document is remaining in the ADF or not.

3. After the registration operation is carried out, the paper feed motor starts rotating forward to transport the document. The document is transported to the position where the timing sensor comes on, which means the end of the pre-feeding operation. Ongoing dummy ejection is carried out.

4. The transportation motor and paper feeding motor rotate forward and backward, respectively, to transport the document onto the platen glass. Then the document size is measured when the registration sensor goes off and the paper feed motor stops rotating when the timing sensor goes off.

Figure 2-2. Document Set Condition (Step 1)

Figure 2-3. Pre-feeding (Step 2)

Figure 2-4. Pre-feeding (Step 3)

Figure 2-5. Single Feeding (Step 4)

ADF Operating Principles

Rev. A

2-

3

5. The document is transported until the rear edge passed the document stopper, then the transportation motor stops rotating.

6. The transportation motor rotates backward to move the document back until it bumps against the paper stopper, and the motor stops. With the document aligned with the stopper, paper skew is corrected and the document is ready to be scanned. The ADF sends the paper feeding complete signal to the scanner.

7. While scanning is proceeding, the paper feed motor starts rotating forward to pick up and transport the document. The motor stops when the registration sensor comes on.

8. After the registration operation is carried out, the paper feed motor rotates forward to transport the document to the position where the timing sensor comes on, and the pre-feeding operation is done. Then the ADF sends the operation complete signal to the scanner.

10 mm

Figure 2-6. Single Feeding (Step 5)

Im pact

Figure 2-7. Single Feeding (Step 6)

Figure 2-8. Single Feeding (Step 7)

Figure 2-9. Single Feeding (Step 8)

ADF Operating Principles

Rev. A

2-

4

9. After scanned, the scanned document is ejected according to the single feed command from the scanner and the pre-fed document is transported to the scanning position.

10. After the document is fed by the forward rotation of the transportation motor and the paper eject/reverse motor, the paper feed motor rotates backward to transport the document onto the platen glass and stops when the timing sensor goes off.

11. After the paper feed motor stops rotating, the transportation motor transports the document and stops rotating when the rear edge of the document passed the document stopper. In case the empty sensor goes off while the document is transported, the shutter solenoid goes off. The ADF continues to eject the scanned document.

12. Transportation motor rotates backward to feed back the fed document to align it with the document stopper causing impact, then the transportation motor stops. With the document set on the scanning position, the ADF sends the paper feeding complete signal to let the scanner start scanning. The ADF continues to eject the scanned document.

Figure 2-10. Single Feeding (Step 9)

Figure 2-11. Single Feeding (Step 10)

Figure 2-12. Single Feeding (Step 11)

Figure 2-13. Single Feeding (Step 12)

ADF Operating Principles

Rev. A

2-

5

13. While scanning, the document is ejected to the output tray. Rotational speed of the paper eject/reverse motor is reduced when the paper eject/reverse sensor is near off condition to output the document to the output tray slowly.

14. The paper eject/reverse motor stops after outputting the document to the tray slowly. The ADF sends the operation complete signal to the scanner and waits for the next command to be sent.

15. When the ADF receives the ejection command, it starts ejecting the scanned document. The transportation motor and the paper eject/reverse motor rotate forward for this operation.

16. The paper eject/reverse motor reduces its rotational speed when the paper eject/reverse sensor is near off condition to output the document to the output tray slowly. The paper eject/reverse motor then stops when the paper eject/reverse sensor goes off.

17. The ADF sends t he operation complete signal to the scanner when the document is slowly ejected and the paper eject/reverse motor stops rotating.

Figure 2-14. Single Feeding (Step 13)

Figure 2-15. Single Feeding (Step 14)

Figure 2-16. Single Feeding (Step 15)

Figure 2-17. Single Feeding (Step 16)

Figure 2-18. Single Feeding (Step 17)

ADF Operating Principles

Rev. A

2-

6

REVERSE FEEDING

In the reverse feeding mode, document is fed in the following order:

The document is fed. ® The document is reversed. ® Image is scanned ® The document is reversed again. ® Image on the reversed side is scanned.

Setting a document

1. Document is set in the paper feeding tray.

Pre-feeding

"Pre-feeding" consists of operations which pick up the document from the paper feed tray and transport it to the scanning position according to the reverse feed command sent from the scanner.

2. Step 2) After the wait shutter solenoid turns on, the document is picked up and transported from the paper feed tray by the forward rotation of the paper feed motor. The motor then stops rotating when the registration sensor comes on. This sequence, from picking up the document to the registration sensor's coming on, is called registration operation. The transportation motor and the paper eject/reverse motor also rotate forward to perform dummy ejection to prevent a remaining document from jamming when the ADF is feeding another document. This is performed for every feeding motion no matter a document is remaining in the ADF or not.

3. After the registration operation is carried out, the paper feed motor starts rotating forward to transport the document. The document is transported to the position where the timing sensor comes on, which means the end of the pre-feeding operation. Ongoing dummy ejection carries on.

4. The transportation motor and paper feed motor rotate forward and backward, respectively, to transport the document onto the platen glass. The paper feed motor stops rotating when the registration sensor goes off. The flapper solenoid comes on to switch the paper path to the paper eject/reverse mechanism side.

Figure 2-19. Setting a Document (Step 1)

Figure 2-20. Pre-feeding (Step 2)

Figure 2-21. Pre-feeding (Step 3)

Figure 2-22. Reverse Feeding (Step 4)

ADF Operating Principles

Rev. A

2-

7

5. When the paper eject/reverse sensor comes on, the transportation motor stops and then the paper eject/reverse motor stops to hold the document in the paper eject/reverse mechanism.

6. The transportation motor rotates backward and then the paper eject/reverse motor rotates forward to transport the document from the paper eject/reverse mechanism to the scanning position on the platen glass. The paper eject/reverse motor stops when the paper eject/reverse sensor goes off. When the document bumps against the paper stopper, transportation motor stops and the flapper solenoid goes off to stop transporting the document. With the document set for scanning, the ADF sends the paper feeding complete signal to the scanner, and the scanner starts scanning.

7. The paper feed motor starts rotating forward to pick up and transport another document from the paper feed tray. The motor stops when the registration sensor comes on.

8. After the registration operation is carried out, the paper feed motor rotates forward to transport the pre-fed document to the position where the timing sensor comes on. The pre-feeding operation is complete when the ADF sends the operation complete signal to the scanner.

Figure 2-23. Reverse Feeding (Step 5)

Figure 2-24. Reverse Feeding (Step 6)

Figure 2-25. Reverse Feeding (Step 7)

Figure 2-26. Reverse Feeding (Step 8)

ADF Operating Principles

Rev. A

2-

8

9. According to the reverse feeding command, the transportation motor and the paper eject/reverse motor rotate forward to transport the scanned document to the paper eject/reverse mechanism and the flapper solenoid comes on to switch the paper path to the paper eject/reverse mechanism side.

10. When the paper eject/reverse sensor comes on, the transportation motor stops and then the paper eject/reverse motor stops to hold the document in the paper eject/reverse mechanism.

11. The transportation motor rotates backward and then the paper eject/reverse motor rotates forward to transport the document from the paper eject/reverse mechanism to the scanning position on the platen glass. The paper eject/reverse motor stops when the paper eject/reverse sensor goes off. When the document bumps against the paper stopper, transportation motor stops and the flapper solenoid goes off to stop transporting the document. With the document set for scan, the ADF sends the paper feeding complete signal to the scanner, and the scanner starts scanning.

12. After scanning, the ADF starts ejecting the scanned document and transporting the pre-fed document according to the reverse feeding command. The transportation motor and the paper eject/reverse motor rotate forward to transport the document to eject it.

Figure 2-27. Reverse Feeding (Step 9)

Figure 2-28. Reverse Feeding (Step 10)

Figure 2-29. Reverse Feeding (Step 11)

Figure 2-30. Reverse Feeding (Step 12)

ADF Operating Principles

Rev. A

2-

9

13. The transportation motor rotates forward and then the paper feed motor rotates backward to transport the pre-fed document to the platen glass. The document size is measured when the registration sensor goes off, and the paper feed motor stops when the timing sensor goes off. The flapper solenoid also comes on to switch the paper path to the paper eject/reverse mechanism side.

14. After the paper feed motor stops, the transportation motor starts transporting the document and stops when the leading edge of the document is near the paper eject/reverse mechanism to wait for the scanned document to be ejected completely. In case the empty sensor goes off while transporting, the shutter solenoid goes off.

15. After the scanned document is ejected, the flapper solenoid comes on to switch the paper path to the paper eject/reverse mechanism side. The transportation motor and the paper eject/reverse motor rotate forward to transport the fed document to the paper eject/reverse mechanism.

16. When the paper eject/reverse sensor comes on, the transportation motor stops. Then the paper eject/reverse motor stops to hold the document in the paper eject/reverse mechanism.

Figure 2-31. Reverse Feeding (Step 13)

Figure 2-32. Reverse Feeding (Step 14)

Figure 2-33. Reverse Feeding (Step 15)

Figure 2-34. Reverse Feeding (Step 16)

ADF Operating Principles

Rev. A

2-1

0

17. The transportation motor rotates backward and then the paper eject/reverse motor rotates forward to transport the document from the paper eject/reverse mechanism to the scanning position. The paper eject/reverse motor stops when the paper eject/reverse sensor goes off and the transportation motor stops when the document bumps against the paper stopper. Document transportation stops when the flapper solenoid goes off. With the document set for scan, the ADF sends the paper feeding complete signal to the scanner, and the scanner starts scanning.

18. After scanning, the ADF starts transporting the scanned document back to the scanning position via the paper eject/reverse mechanism. The transportation motor and the paper eject/reverse motor rotate forward to transport the scanned document to the paper eject/reverse mechanism and the flapper solenoid comes on to switch the paper path to the paper eject/reverse mechanism side.

19. When the paper eject/reverse sensor comes on, the transportation motor stops and then the paper eject/reverse motor stops to hold the document in the paper eject/reverse mechanism.

20. The transportation motor rotates backward and then the paper eject/reverse motor rotates forward to transport the document from the paper eject/reverse mechanism to the scanning position. The paper eject/reverse motor stops when the paper eject/reverse sensor goes off and the transportation motor stops when the document bumps against the paper stopper. With the document set for scan, the ADF sends the paper feeding complete signal to the scanner, and the scanner starts scanning.

Figure 2-35. Reverse Feeding (Step 17)

Figure 2-36. Reverse Feeding (Step 18)

Figure 2-37. Reverse Feeding (Step 19)

Figure 2-38. Reverse Feeding (Step 20)

ADF Operating Principles

Rev. A

2-11

21. According to the ejection command from the scanner, the scanner starts ejecting the scanned document. The transportation motor and the paper eject/reverse motor rotate forward to eject the scanned document.

22. When the paper eject/reverse sensor is near off condition, rotational speed of the paper eject/reverse motor is reduced to eject the document slowly to the output tray. The transportation motor stops when the paper eject/reverse sensor goes off.

23. The paper eject/reverse motor stops after the document is ejected to the output tray and the ADF sends the operation complete signal to the scanner.

Figure 2-39. Reverse Feeding (Step 21)

Figure 2-40. Reverse Feeding (Step 22)

Figure 2-41. Reverse Feeding (Step 23)

ADF Operating Principles

Rev. A

2-1

2

2.1.2 Electrical Circuit

This ADF (R-4C1070).is equipped with only one control board. This section describes the functions of the board.

2.1.2.1 Transmission Circuit

The transmission circuit manages parallel and serial signal transmission between the ADF and the scanner. The protocol used between them is original.

q Serial transmission

IC11 is the transceiver used for the serial transmission. It receives output signal from the CPU and separates them according to the signal types; reversed or non-reversed, then it outputs the signals to the scanner from DO1. 2 signals (RI1 and RI2) sent from the scanner are combined into 1 signal and output from the RO1.

q Parallel transmission

Signals sent from the CPU is output at the open collector via IC1 and IC3. Signals from the scanner are transferred to the CPU via the pullup resistor.

TXD

1

2

3

4

5

6

7

8

9

*TXD

RXD

*RXD

DTR

DSR

GND

OP1

OP2

GND

DTR

B

A

Y

IC1

Q3

+5V

R36

1.0K

DSR

R64

4.7K

CN6

R81 220

DA2

+5V

GND

DA1

GND

IC11

GND

R35 1K

79

80

21

3

4

15

5

9

1

2

14

13

6

7

10

11

CPU

GND

*RI1

RI1

DO1

*DO1

*RI2

RI2

DO2

*DO2

RO1

DI1

*RE

DE

RO2

DI2

RXD

TXD

TXEN

R63

4.7K

R62

4.7K

IC12

Figure 2-42. Transmission Circuit Block Diagram

ADF Operating Principles

Rev. A

2-1

3

2.1.2.2 Paper Size Detection Circuit

The edge guides in the paper feed tray of this ADF are used to detect the paper size. As they move, slide resistance changes in accordance with the distance between them. The resistance is then converted into analog data and transferred to the CPU, where the paper size is determined. This circuit consists of the RC noise filter.

1

2

3

+5V

DWVR

GND

+5V

10K

R11

GND

C41

0.01 uF

GND

TP24

AN17

63

IC12

CPU

C62

0.01 uF

CN1

Figure 2-43. Document Width Detection Circuit Block Diagram

2.1.2.3 Document Sensor (Empty Sensor) Circuit

A photo-interrupter sensor located at the bottom of the paper feed tray is used to detect document. The ADF determines whether or not it continues pre-feeding based on the signal sent from this sensor. The signal is transferred to the CPU via the resistors only.

1

2

3

CN1

EMP

SGND

+5V

TP16

P67

20

IC12

CPU

GND

+5V

180

15

10K

Figure 2-44. Document Sensor Circuit Block Diagram

ADF Operating Principles

Rev. A

2-1

4

2.1.2.4 Paper Feeding Motor Encoder Sensor Circuit

The paper feeding motor is used to manage the following operations:

q Registration operation q Drives the transportation motor after the timing sensor goes off. q Controlling backward rotation of the motor

Since this motor is used for various operations, the mot or rot ation must be precisely controlled. Failure in controlling the motor does not guarantee prompt feeding, or may result in jamming caused by the document inserted over the document remaining in the ADF. The m otor rotation is controlled according to the signal form the photo-int errupter which detects the slid plate directly attached to the motor shaft. The signal is output to the CPU via the resistors only.

1

2

3

+5V

KM CLK

GND

+5V

TP20

INTP2

74

IC12

CPU

GND

CN1

R82

180

R61 10K

R14

10K

Figure 2-45.

Paper Feeding Motor Encoder Sensor Circuit Block Diagram

2.1.2.5 Registration Sensor Circuit

The registration sensor with an LED and the photo tr ansistor built in has an mirror attached across the paper path. Since t he registration sensor is a reflex type sensor, it detects paper empty condit ion by emitting infr ared light from the LED toward the mir ror and receiving the light reflected on the mirror. The voltage input to the sensor is divided by R55 and R56, and 1/3 of the original level is input to the AD converter of the CPU. (Actually, it is regulated to 5 V by D2.) Analog data fo r the input voltage is output one after another in a rectangle waveform from IC4 via PWM circuit in the gate array. This PWM signal is integ rated via R3 and C6 of the C,R circuit and converted into the analog voltage. Then it is am plified by the non-reverse amplifier to establish the reference value for the comparator. Therefore, the reference value is set to 1/3 of the High level of each sensor output timing. In case the voltage level input to the AD converter of the CPU drops below 1.6 V, the CPU outputs High from Pin 48 to increase LED emission.

13

14

15

AN+24V

REGS

RDDLED

CN1

IC4-18

RDDPWM

R3

10K

AGND

C44

0.01uF R38

22 K

IC5

+

C6

0.01uF

AGND

R39 22K

R60

4.7K

C40

0.01uF

AGND

IC6

+

R56

100K

R23 10K

+5V

AN+24V

TP19

73

TP14

R68

2.7 K

R69

5.6 K

AGND

10K

R65

10K

TP23

D2

R4

10K

56

C16

0.1uF

R55

4.7K

AGND

Q4

48

IC12

CPU

INTP1

ANIO

P11

Figure 2-46. Registration Sensor Circuit Block Diagram

ADF Operating Principles

Rev. A

2-1

5

2.1.2.6 Sensor Circuits

The timing sensor and the paper eject/reverse sensor are reflex type sensors, and each of them has an LED and photo-transistor built in it. Each sensor emits infrared light from the LED toward the mirror attached across from the sensor and detects paper empty condition when it receives the infrared light reflected on the mirror. The cathode of the LED is connected to the collector of Q3. Current output to the photo diode is controlled at the terminal AN0 of the CPU. Photoelectric current from the photo transistor is converted into voltage via the resistor in the input circuit of the sensor, and is input to the comparator, where the voltage level is compared with the reference voltage (2V). If the input voltage is higher than the reference voltage, it means the paper empty condition, and the compactor outputs a Low signal to the CPU. Since sensors are generally produced with uneven sensitivities, the CPU adjusts the input voltage from t he sensor to the specified level. When the ADF is turned on under the paper empty condition, the input voltage (analog data) from the sensor is input to the CPU as a digital data. The CPU then manipulates the data to make the proper level of output voltag e (analog data). After this process, the cur rent flows to the LED changes and the input voltage from the sensor is adjusted to the proper level as the result.

10 12

+5V

TIMS DA

CN1

+5V

TP13

-

+

IC12

CPU

ANO0

INTP0

ANI1

C49 1000uF

GND

R73

100

R17

100

IC5

Q13

67

+5V

TP11

R25 10K

-

+

+5V

R46 22K

R77 15K

AGND

R58 200K

IC6

72

57

AGND

C38

0.1uF

AGND

R18

10K R67 3K

11

TIMS

CN1

Figure 2-47.

Timing Sensor Circuit / Reverse Sensor Circuit Block Diagrams

Epson GT-1200 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual