avision ava6 plus service manual

Flatbed Scanner AVA6 PLUS

Service Manual

Avision Inc.

ii

Contents 1. INTRODUCTION .............................................................................................1-1

1.1 GENERAL NOTES FOR SERVICING......................................................................1-1

2. INSTALLATION/TRANSPORTATION ...............................................................2-1 2.1 PRECAUTIONS OF INSTALLATION ......................................................................2-1

2.2 TRANSPORTATION.......................................................................................2-1

3. THEORY OF OPERATION.................................................................................3-1 3.1 INTRODUCTION..........................................................................................3-1

3.2 MAIN CONTROL UNIT ...................................................................................3-2 3.2.1 System diagram ..........................................................................3-2 3.2.2 Main control ................................................................................3-3 3.2.3 Power supply circuit .....................................................................3-4 3.2.4 Power supply...............................................................................3-5

4. PROBLEM SOLVING ........................................................................................4-1 4.1 DIAGNOSTICS ...........................................................................................4-1

4.2 TROUBLESHOOTING.....................................................................................4-2 4.2.1 Flowcharts ..................................................................................4-2 4.2.2 Tables ........................................................................................4-5

5. DISASSEMBLY ................................................................................................5-1 5.1 SERVICE TOOL ..........................................................................................5-1

5.2 PROCEDURE FOR DISASSEMBLY AND REASSEMBLY...................................................5-2 5.2.1 Notes on disassembly ...................................................................5-2 5.2.2 Removing the Document Cover ......................................................5-3 5.2.3 Removing the Upper Housing.........................................................5-4 5.2.4 Removing the Right Button PCBA (LB58) .........................................5-6 5.2.5 Removing the Left Button PCBA (LB57) ...........................................5-7 5.2.6 Removing the Main Board..............................................................5-9 5.2.7 Removing the Optical Unit ........................................................... 5-12 5.2.8 Removing the Flat Cable to the Optical Unit ................................... 5-16 5.2.9 Removing the Inverter................................................................ 5-18 5.2.10 Removing the Lamp Assembly ..................................................... 5-22 5.2.11 Removing the Transmission (Motor) Assembly................................ 5-25

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1-1

1. INTRODUCTION

General Notes for Servicing General Description

This manual is intended to be used by the maintenance engineers. It describes areas to be maintained, the detailed installation, the disassembly, and the component replacement procedures as well as the main trouble shooting guides. Please take your time to read this manual thoroughly to obtain comprehensive knowledge about the scanner before serving the unit. 1.1 General notes for servicing

(1) Before trying to disassemble the scanner, make sure the power supply cord of the

scanner is disconnected from the power outlet. Under any circumstance, do not remove or install the connectors on the scanner with the power supply turned ON.

(2) Use caution not to drop small parts or screws inside the unit when disassembling and reassembling. If left inside, they might cause the malfunction of the unit.

(3) Do not pull the connector cable when disconnecting it. Hold the connector.

(4) When carrying the scanning head unit, put it in an anti-static bag.

(5) Keep the document table glass surface always clean. If contaminated, use a dry clean cloth for cleaning.

(6) Use caution not to injure your fingers or hands when disassembling or reassembling the unit.

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2. INSTALLATION/TRANSPORTATION

Precautions of Installation Transportation

2.1 Precautions of Installation

Pay attention to the following matters before unpacking and installation.

Do not install in a place where vibration may occur. Keep the scanner out of direct sunlight. Do not install near a heat source. Do not place the scanner around materials which shut off the circulation of air. Do not install in a humid or dusty place. Use care not to scratch the glass surface of the scanner or the document holding

pad with a clip or staple. Do not use the wall socket with connecting devices which may generate noise, for

example, air-conditioner, etc. Use a suitable AC power source. Place the scanner on a level surface.

2.2 Transportation

To move the scanner from where it is installed, for repair or any other reason, make sure to observe the following conditions:

(1) Move the lock switch to the “Locked” position.

(2) Turn off the power of the scanner.

(3) Remove the power cable.

(4) Put the scanner in the packing case with the packing material.

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3. THEORY OF OPERATION

Introduction Main Control Unit

3.1 Introduction

Figure 3.1

The reflected rays of your original as shown in the above Figure 3.1 pass through the lens and create an image on the CCD (Charged Coupled Device). Then, according to the different light intensity perceived by the CCD, the CCD will transfer these data into a series of analog signals to the main board, where the signals are turned into digital signals. These digital signals flows to the image processor to store into a host computer acceptable format then goes to USB2.0 controller to transfer to a host computer.

3-2

3.2 Main control unit

3.2.1 System diagram

Figure 3.2 Product System Block Diagram

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3.2.2 Main control

Use ASIC(S5) to image catch and image process.

Figure 3.3 Main Control Block Diagram

3-4

3.2.3 Power supply circuit

This power system uses Liner and buck regulator to transit voltage to supply system need.

Figure 3.4 Power System

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3.2.4 Power supply

In this system, there is only one type of power supply. Please see Table 3.1 for details.

Table 3.1 Power Adapter

Type Characteristic

Wall-mount

Input voltage range 100-240V Input current (at the rated input/output)

2A type or less

Input frequency 50-60Hz Max. in-rush current(@full load, cold start)

6A

Output voltage +12Vdc Min. load current 0.0A Max. load current 1.5A Total power (at full load)

18W

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4. PROBLEM SOLVING

Diagnostics Troubleshooting

4.1 Diagnostics When the scanner is turned on, the initial diagnostics will be performed. The errors will be displayed in scanner’s TWAIN driver and are listed in below:

Error Code Error Code Meaning Solutions

Err7 Calibration failed. 1. Check if the motor rotates smoothly. 2. Check the Optical Chassis.

Err101 Power off or cable failure.

Check if the power cable has been connected to the scanner correctly.

Err129 Can't find scanner. Check the following: 1. If scanner is powered on. 2. If USB cable has been connected to

the scanner correctly. 3. If the scanner driver has been

installed on your computer successfully.

Err153 Driver Initial Failed. 1. Check if the USB cable has been connected to the scanner correctly and if scanner driver is installed successfully.

2. If the error still occurs, replace the main board.

Err176 Back to Home Position Failed.

1. Check if the motor rotates smoothly. 2. Check motor or the main board.

4-2

4.2 Troubleshooting

Refer first to the applicable troubleshooting flowchart in the following two sections. The flowcharts refer you to the appropriate table for detailed troubleshooting.

4.2.1 Flowcharts

This section provides the following three troubleshooting flowcharts: Troubleshooting from power on to scanner ready Troubleshooting

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4.2.1.1 Troubleshooting flowchart: power on to scanner ready

Troubleshooting From Power on

Power LED on

No

Yes

See Table 4.1

Move to calibration

position.

Wait for command from

host

Scan module

moves to home

position

No

Yes

See Table 4.2

4-4

4.2.1.2 Troubleshooting flowchart:

(Flatbed Operation) Troubleshooting

End

No

Yes

No

Yes

Yes

Yes

No

See Table 4.3

See Table 4.4

See Table 4.5

See Table 4.6

Scan module moves to

flatbed home position

Image appears

Image unclear

Strange sound

generated

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4.2.2 Tables

The tables in this section provide detailed troubleshooting information.

4.2.2.1 The Power LED does not go on

Cause Relevant

Unit Check Method Maintenance

Method Remark

Unplugged from outlet

None Visual check Insert the AC plug into the outlet.

None

AC power unplugged at unit

None Visual check Insert the AC cable into unit.

None

AC voltage failure

None AC outlet voltage check

None None

Power unit AC input connector disconnected

None Visual check Connect the connector.

None

Power unit-main PCBA connection failure


None

Power unit output voltage failure

Power unit Output voltage (+5V) check

Replace the power unit

None

PCBA Failure *main control PCBA

Tester check (+5V, GND)

Remove the cause or replace the PCBA.

None

Table 4.1

4-6

4.2.2.2 Scan module does not move to the home position

Cause Relevant

Unit Check Method Maintenance

Method Remark

CCD board-main control PCBA connection failure


None

CCD board-main control PCBA cable failure

CCD board-main control PCBA cable

Tester or visual check

Check the cable connecting the CCD board and the main control PCBA

Motor-main control PCBA connection failure


None

Motor failure Motor Visual check Replace the motor module.

Motor failure

Power supply-main control board connection failure


None

Power supply fails

Power supply

Tester check (+15V, -15V, +24V, GND)

Replace the power supply.

None

CCD board fails CCD board Tester check Replace the Optical Chassis.

None

Table 4.2

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4.2.2.3 Scan module does not move to the flatbed position

Cause Relevant

Unit Check Method

Maintenance Method

Remark


None Visual check Replace the power supply.

None

Power supply fails

Power supply

Tester check ( +12V, GND)


None

Motor-main control PCBA connection failure


None

Motor failure Motor Visual check Replace the motor module.

None

CCD board-main control PCBA connection failure


None

main control board failure

main control board PCBA

Tester check Replace main control board PCBA

None

CCD board fails

CCD board Tester check Replace the Optical Chassis.

None

Table 4.3

4-8

4.2.2.4 Image does not appear

Cause Relevant

Unit Check Method

Maintenance Method

Remark



None

Power supply fails.

Power supply Tester check (+12V, GND)


None

Lamp failure Lamp Visual check Replace the lamp.

None

CCD board-main control board connection failure


None

CCD board fails.

CCD Board Visual check Replace the Optical Chassis.

None

Table 4.4

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4.2.2.5 Image unclear

Cause Relevant Unit Check

Method Maintenance Method

Remark

Lamp too dark

Lamp Visual check Replace with a new lamp.

None

Dirt on calibration reference plate

Calibration reference plate

Visual check Clean the flatbed glass by a clean cloth moistened with isopropyl alcohol.

None

Dirt on calibration reference plate

Calibration reference plate

Visual check Clean the calibration reference plate by a clean cloth moistened with isopropyl alcohol.

None

Dirt on the mirrors

Mirrors Visual check Clean the mirrors by a clean cloth moistened with isopropyl alcohol.

None

Dirt on the lens

Lens Visual check Clean the lens with isopropyl alcohol.

None

Table 4.5

4-10

4.2.2.6 Strange sound generated

Cause Relevant Unit

Check Method

Maintenance Method

Remark

Motor unit failure

Motor unit Replace the motor unit.

Replace the motor unit.

None

Main control PCBA failure

Main control PCBA

Replace the main control PCBA.

Replace the main control PCBA.

None

Scanning module failure

Scanning module

Check if scanning module is loose.

Replace the Optical Chassis.

None

Motor noise

Assembly error

Is the motor correctly assembled on the metal plate?

None None

Table 4.6

Service Manual

5-1

5. DISASSEMBLY

Service Tools Procedure for Disassembly and Reassembly

5.1 Service Tool

Table 5.1 describes the maintenance tools necessary for the maintenance of this equipment.

No.

Name Description

1 Minus screwdriver Idler pulley module screw 2 Philips screwdriver

(magnetic) Nominal No.2 M3, M4

3 Oil Shell “Terrace Oil 46” 4 Grease Shell “Alvania Grease No.2” 5 Alcohol (Isopropyl 91% >) Cleaning 6 Digital voltmeter With 0.01 V range 7 Oscilloscope 100 MHz or more with

external sweep 8 Blower Cleaning

Table 5.1 Maintenance tools

5-2

5.2 Procedure for disassembly and reassembly

5.2.1 Notes on disassembly

(1) Clean the disassembly and assembly location.

(2) Disconnect the power cable and remove the AC plug from the outlet before disassembly and assembly.

(3) Follow the disassembly and assembly procedures. Never loosen the screws of parts that must not be disassembled.

(4) Store the disassembled parts in a clean place to avoid loss.

(5) After replacement, check the contacts and spare part mounting.

(6) Assemble the parts in reverse order of disassembly procedure.

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5-3

5.2.2 Removing the Document Cover

Remove the studs on the Document Cover from the main unit.

Document Cover

5-4

5.2.3 Removing the Upper Housing

1. Turn the scanner over to reveal the bottom. Remove 2 fixing screws on the Bottom

Housing as shown.

(Torque：5±0.5Kgf.cm / Screw Type: 3x8 / PN: 077-0812-0) 2. Remove the Document Cover as described in the preceding section 5.2.2. 3. Loosen the Upper Housing Assembly from the bottom housing and then remove it.

Fixing Screw

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5-5

4. Lift the Upper Housing Assembly and disconnect the flat cable to the main board as shown to remove the Upper Housing Assembly.

Upper Housing Assembly

Flat Cable

Upper Housing Assembly

Bottom Housing Assembly

5-6

5.2.4 Removing the Right Button PCBA (LB58)

1. Remove the Upper Housing as described in the preceding section 5.2.3.

2. Remove 2 fixing screws on the right button PCBA (LB58) and then disconnect the cable as shown.

(Torque：4±0.5Kgf.cm / Screw Type: 3x6 / PN: 077-0626-0)

Rear Side Front Side

Reassembling:

For correct cable connection of the LB58 PCBA, please refer to the following figure:

Fixing Screw

Cable to the PCBA

LB58 PCBA

Front Side Rear Side

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5.2.5 Removing the Left Button PCBA (LB57)


2. Remove the fixing screw on the left button PCBA and then disconnect the cable as shown.


3. Disconnect the flat cable as shown.

Fixing Screw

Cable to the PCBA

Flat Cable

LB57 PCBA

Flat Cable

5-8

Reassembling:

For correct cable connection of the LB57 PCBA, please refer to the following figure:

Rear Side Front Side

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5-9

5.2.6 Removing the Main Board


2. Disconnect the flat cable on the main board as shown.

3. Remove 2 fixing screws on the main board as illustrated.


Fixing Screw

Flat Cable

5-10

4. Disconnect the motor cable to the main board. The main board is removed.

Motor Cable

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Reassembling:

1. For correct cable connection of the main board, please refer to the following figure:

Wind the cables before connecting to the main board

2. While reconnecting the motor cable to the main board, be sure to wind the cable for a few times and then connect it to the connector on the main board as illustrated.

5-12

5.2.7 Removing the Optical Unit


2. Remove one fixing screw on the sliding rod as shown.


3. Move the Optical Chassis to the center and then disconnect the flat cable to the Optical Chassis as shown.

Fixing Screw

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5-13

4. Lift the Lower Sliding Rod and then remove the Sliding Rod from the Optical Chassis as

shown.

5. Remove the belt from the slot of the Optical Chassis as indicated. The Optical Chassis is removed.

Lower Sliding Rod

Belt

Optical Chassis

5-14

Optical Chassis

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Reassembling: 1. For correct cable connection of the CCD board on the Optical Chassis, refer to the

following figure:

2. To reassemble the Optical Chassis to the Bottom Housing, be sure to connect the flat cable to the CCD board with the print side FACING UP as illustrated.

3. After reassembling the Optical Chassis, make sure the Optical Chassis can move freely on the sliding rods.

Connect the Flat Cable with the Text Side Facing Up.

5-16

5.2.8 Removing the Flat Cable to the Optical Unit


2. Move the Optical Chassis to the center and then disconnect the flat cable to the Optical Chassis as shown.

3. Disconnect the other end of the flat cable on the main board as shown.

Flat Cable

The other end of the Flat Cable

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5-17

4. Remove 2 fixing screws on the EMI core of the Flat Cable. The Flat Cable is removed.


Fixing Screw

5-18

5.2.9 Removing the Inverter

1. Remove the Optical Chassis as described in the preceding section 5.2.7.

2. Removing 1 fixing screw on the Optical Chassis as shown.

(Torque：3±0.5Kgf.cm / Screw Type: 2.6x5 / PN: 077-0547-0)

3. Remove the locks on both sides of the Lamp Assembly as illustrated below.

Fixing Screw

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5-19

4. Disconnect the inverter cable on the CCD Board as shown.

CCD Board Inverter Cable

5-20

5. Disconnect the lamp cable on the Inverter.

6. Remove one fixing screw on the Inverter. The Inverter is removed from the Optical Chassis.

(Torque：3±0.5Kgf.cm / Screw Type: 2.6x6 / PN: 077-0620-0)

Fixing Screw

Inverter

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5-21

Reassembling: For correct cable connection of the inverter, please refer to the following figure:

CCD Board CBA292

5-22

5.2.10 Removing the Lamp Assembly


2. Removing 1 fixing screw on the Optical Chassis as shown.

(Torque：3±0.5Kgf.cm / Screw Type: ? / PN: 077-0547-0)

3. Remove the locks on both sides of the Lamp Assembly as illustrated below.

Fixing Screw

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5-23

4. Disconnect the lamp cable on the Inverter. The Lamp Assembly is removed.

Lamp Assembly

5-24

Reassembling: Before reconnecting the lamp cable to the inverter, make sure the cable is winded clockwise for 3 times as illustrated.

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5-25

5.2.11 Removing the Transmission (Motor) Assembly


2. Remove 3 fixing screws on the Transmission Assembly as shown.


3. Remove 2 fixing screws on the left side of the Transmission Assembly as shown.


Fixing Screw

Fixing Screw

5-26

4. Remove the spring on the Transmission Assembly as shown. The Transmission Assembly is removed.

Transmission Assembly

Spring

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5-27

Reassembling: Follow the disassembling procedure in the reverse order to reassemble the Transmission Assembly. Be sure to install the belt with the smooth side facing outward.

Smooth Side Faces Outward

avision ava6 plus service manual

Documents

main control unit

optical unit

main board

power supply circuit

right button pcba lb58

left button pcba lb57

service tool

general notes