Avision AD280 User manual

Sheet-fed Scanner AD280/AD260
Service Manual
Avision Inc.
P/N 253-0142-E

ii
Contents
1. INTRODUCTION.............................................................................................1-1
1.1 GENERAL NOTES FOR SERVICING............................................................. 1-1
2. PRECAUTIONS OF 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 Cable Connection......................................................................... 3-3
3.2.3 Power supply .............................................................................. 3-3
4. PROBLEM SOLVING........................................................................................4-1
4.1 DIAGNOSTICS....................................................................................... 4-1
4.1.1 Online diagnostics........................................................................ 4-1
4.1.2 Offline diagnostics ....................................................................... 4-2
4.1.3 Diagnostic flowcharts ................................................................... 4-3
4.2 TROUBLESHOOTING............................................................................... 4-5
4.2.1 Flowcharts.................................................................................. 4-5
4.2.2 Tables........................................................................................ 4-8
5. CLEANING THE SCANNER...............................................................................5-1
5.1 CLEANING THE ADF.................................................................................... 5-1
5.2 CLEANING THE ADF GLASS ........................................................................... 5-3
6. DISASSEMBLY................................................................................................6-1
6.1 PROCEDURE FOR DISASSEMBLY AND REASSEMBLY..................................... 6-1
6.1.1 Notes on disassembly................................................................... 6-1
6.1.2 Removing the Output Tray............................................................ 6-2
6.1.3 Removing the Input Tray.............................................................. 6-3
6.1.4 Removing the Reverse Roller......................................................... 6-6
6.1.5 Removing the Reverse Roller Cover................................................ 6-8
6.1.6 Removing the Front Cover ............................................................ 6-9
6.1.7 Removing the UI Board .............................................................. 6-12
6.1.8 Removing the Top Cover and Bottom Cover................................... 6-14
6.1.9 Removing the Left/Right Covers .................................................. 6-17
6.1.10 Removing the Upper Base and Bottom Base .................................. 6-19
6.1.11 Removing the Glass Assembly from Upper Base............................. 6-22
6.1.12 Removing the Springs from Upper Base........................................ 6-23
6.1.13 Removing the LED Light Bar from Upper Base................................ 6-24
6.1.14 Removing the Gear from Upper Base............................................ 6-26

Service Manual
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6.1.15 Removing the CCD Assembly from Upper Base .............................. 6-27
6.1.16 Removing the Ultrasonic Transmitter from the Upper Base .............. 6-30
6.1.17 Removing Sensor board from Upper Base ..................................... 6-31
6.1.18 Removing the Conductive Brush .................................................. 6-33
6.1.19 Removing the Idle Roller/Metal Cover/Spring from the Upper Base ... 6-34
6.1.20 Removing the Idle Roller/Metal Cover/Spring /Jam Sensor from the
Upper Base............................................................................... 6-37
6.1.21 Removing the Plastic Hooks from the Upper Base........................... 6-41
6.1.22 Removing the Latch Hook from the Upper Base.............................. 6-42
6.1.23 Removing the Paper-in Sensor from the Upper Base....................... 6-44
6.1.24 Removing the Short Shaft from the Upper Base ............................. 6-46
6.1.25 Removing the Roller Holder and Spring from the Upper Base ........... 6-47
6.1.26 Removing the Top Cover from the Bottom Base ............................. 6-50
6.1.27 Removing the Long Spring from the Bottom Base........................... 6-51
6.1.28 Removing the Roller Cover from the Bottom Base .......................... 6-53
6.1.29 Removing the Pick-up Roller and ADF Roller from the Bottom Base... 6-55
6.1.30 Removing the Shaft Mount from the Bottom Base .......................... 6-58
6.1.31 Removing the Glass Assembly from the Bottom Base...................... 6-60
6.1.32 Removing the Belt from the Bottom Base...................................... 6-62
6.1.33 Removing the Feeding Rollers from the Bottom Base ...................... 6-67
6.1.34 Removing the LED Light Bar from the Bottom Base ........................ 6-70
6.1.35 Removing the Main Board........................................................... 6-71
6.1.36 Removing the Bottom Cover........................................................ 6-73
6.1.37 Removing the CCD Assembly from the Bottom Base ....................... 6-75
6.1.38 Removing the Ultrasonic Receiver from the Bottom Base................. 6-77
6.1.39 Removing the Motor Assembly from the Bottom Base ..................... 6-78
6.1.40 Removing the Motor from the Bottom Base ................................... 6-80
6.1.41 Removing the Input Tray Hinges from the Bottom Base .................. 6-82
6.1.42 Checking Conductivity After Replacement of Metal Parts.................. 6-83

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, 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.

2-1
2. PRECAUTIONS OF
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) Turn off the power of the scanner.
(2) Remove the power cable.
(3) Put the scanner in the packing case with the packing material.

3-1
3. THEORY OF OPERATION
Introduction
Main Control Unit
3.1 INTRODUCTION
Figure 3.1 Theory of Operation
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 flow
to the USB 3.0 Controller to transfer to a host computer.
Main
Board 10010
Cold Cathode
Lens CCD
Analogue
Signal Digital
Signal
Fluorescent Lamp Host
Reflected
Rays Main
Board 10010
Lens CCD
Analogue
Signal Digital
Signal
LED Light Bar
USB 3.0
Controller
Host
Reflected
Ra
y
s

3-2
3.2 MAIN CONTROL UNIT
3.2.1 System diagram
Figure 3.2 AD280/AD260 System Block Diagram

3-3
3.2.2 Cable Connection
3.2.3 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)
45A
Output voltage +24Vdc
Min. load current 0.0A
Max. load current 2A
Total power (at full
load) 48W

4-1
4. PROBLEM SOLVING
Diagnostics
Troubleshooting
This chapter supplies two paths for dealing with operational problems. The first relies
on the scanner’s internal diagnostics. The second uses troubleshooting flowcharts and
tables to isolate the problem. In many cases, the internal diagnostics will help you to
locate the source of the problem quickly. Use these diagnostics first. If the diagnostics
do not locate the source of the problem, refer to Section 4.2 Troubleshooting.
4.1 DIAGNOSTICS
The scanner has internal diagnostics to help you determine the cause of operational
problems. Some of the diagnostics function with the scanner online, while others are
part of a separate offline diagnostics feature.
4.1.1 Online diagnostics
Determine operational problems by observing the display panel and check the LED.
With the scanner online and operating normally, the LED is on. Other LED indications
are described in the following table.
Double-colored
LED – Green Light Double-colored LED – Red Light LCD State
Short Blinking Off Show massage
“Initializing” Power on
diagnostics
Off Blinking Refer to table 4-2 Group Error
Table 4.1 Online diagnostics

4-2
4.1.2 Offline diagnostics
To run the offline diagnostics, and turn the power back on. When you first turn the
scanner back on, the LED light will blink, indicating that the diagnostics are in
progress. Observe the front panel LED closely. In a short time, the LED indicates the
results of the offline diagnostics as explained in the table below.
Double-colored LED –
Green Light LCD Error indication
OFF “Error code 2013
ADF paper jam” Group 2 error (Paper Jam Error )
OFF “Error code 2014
ADF cover open” Group 3 error (Cover Open Error )
Table 4.2 Offline diagnostics results
To return the scanner to online operation, turn off the scanner and turn the scanner
back on.

4-3
4.1.3 Diagnostic flowcharts
Use the flowcharts that follow to determine the exact problem when either the online
or offline diagnostics indicate a group error. Refer to Chapter 4 for parts replacement.
4.1.3.1 Group 2 error flowchart (paper in paper tray)
This flowchart applies when the LED is off and LCD shows Error code 2013 with the
scanner online, and there is paper in the ADF paper tray.
Group 2 Error
Open cover, then remove the papers
from input tray, and wait for 3
seconds than close the cover.
Scanner is ready ?
Check the paper detect
sensor, paper scan
sensor, and wheel paper
jam sensor if they work,
and replace them, if they
are broken.
YesNo
OK
Error code 2013 ?
No
Refer to the result
in Table 4.2
Yes

4-4
4.1.3.2 Group 3 error flowchart (no paper in paper tray)
This flowchart applies when the Green light LED is off and the LCD shows Error
code 2014 with the scanner online, and there is no paper in the paper tray.
Group 3 Error
Open cover, then close the
cove
r
Check Green light LED
on?
Place a piece of paper
into ADF Input Paper
Tray and waits for 3 secs.
Refer to the
Result in Table
4.2
Yes
No
OK

4-5
4.2 TROUBLESHOOTING
Refer first to the applicable troubleshooting flowchart in the following three sections. The
flowcharts refer you to the appropriate table for detailed troubleshooting.
4.2.1 Flowcharts
This section provides the following troubleshooting flowcharts:
Troubleshooting from power on to scanner ready
Online troubleshooting

4-6
4.2.1.1 Troubleshooting flowchart: power on to scanner ready.
Troubleshooting From Power on
Power
LED on
N
o
Yes
See Table 4.3
Face down light check
Face up light check
Wait for command
from host
(Green LED on)
Warming-
up Finish?
N
o
Yes
Warming-up Check
(Green LED Blinking)

4-7
4.2.1.2 Troubleshooting flowchart: online operation
(ADF mode)
Online Troubleshooting
End
N
o
N
o
Yes
N
o
Yes
N
o
Yes
Yes
Yes
See Table 4.9
See Table 4.10
See Table 4.10
See Table 4.6
See Table 4.7
See Table 4.8
See Table 4.11
Frequent
Paper Jam?
Frequent
double feed
Large skew
volume?
Large jitter
Reading
position
deviation?
N
o
N
o
Yes
Yes
N
o
Image
unclear
Strange
sound
g
enerated?

4-8
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
Unplugged from outlet None Visual check Insert the AC plug
into the outlet.
AC power unplugged
at unit None Visual check Insert the AC cable into unit.
Power switch is OFF None Visual check Turn the power
switch on.
AC voltage failure None AC outlet voltage
check None
Power unit AC input
connector
disconnected
None Visual check Connect the
connector.
Power switch
connector
disconnected
None Visual check Connect the
connector.
Power unit-main PCBA
connection failure None Visual check Connect the connector.
Power unit output
voltage failure Power unit Output voltage (+24V) check Replace the power unit
PCBA Failure -main control
PCBA
-LED board
Tester check
(+24V, GND)
Remove the cause
or replace the
PCBA.
LED board-main PCBA
connection failure None Visual check Connect the connector
Table 4.3
*: Check method explains how to check the failed item.
The visual check can be made by physically observing the part or observing the
offline test display on the front panel. The tester check is made by checking the
voltage levels of the relevant units.

4-9
4.2.2.2 Reading is not performed
Cause Relevant
Unit Check Method Maintenance Method
cover open cover Visual check Close the cover.
Table 4.4
4.2.2.3 Image does not appear
Cause Relevant
Unit Check Method Maintenance Method
cover open cover Visual check Close the cover
Power supply-
main control
board
connection
failure
None Visual check Connect the
connector.
Power supply
fails. Power supply
Tester check
(+24V, GND) Replace the power
supply.
Lamp failure Lamp Visual check Replace the lamp.
Power Board
failure Power Board
Visual check Replace the Power
Board.
CCD board-
main control
board
connection
failure
None Visual check Connect the
connector.
CCD board
fails. CCD Board Visual check Replace the optical unit.
Table 4.5

4-10
4.2.2.4 Large jitter
Cause Relevant
Unit Check Method Maintenance Method
Power supply-
main control
board connection
failure
None Visual check Connect the
connector.
Power supply fails Power
supply Tester check (+24V, GND)
Replace the power
supply.
Motor-main
control PCBA
connection failure
None Visual check Connect the
connector.
Motor failure Motor Visual check Replace the motor.
Table 4.6
4.2.2.5 Reading position deviation
Cause Relevant Unit Check Method Maintenance
Method
Power supply-main
control board
connection failure
None Visual check Connect the
connector.
Power supply fails Power supply Tester check
(+24V, GND)
Replace the
power supply.
Motor- main control
PCBA connection
failure
None Visual check Connect the
connector.
Motor failure Motor Visual check Replace the
motor
IR sensor board- main
control PCBA cable
failure
None Visual check Connect the
connector
IR sensor board- main
control PCBA cable
failure
Sensor board-
main control
PCBA cable
Tester or visual
check Replace the IR sensor cable
IR sensor board
failure Sensor board Tester check Replace the PCBA.
Table 4.7

4-11
4.2.2.6 Image unclear
Cause Relevant Unit Check Method Maintenance Method
Lamp too dark Lamp Visual check Replace with a new
lamp.
Dirt on
calibration
reference plate
Calibration
reference plate Visual check Clean the glass with isopropyl alcohol.
Dirt on the
mirrors Mirrors Visual check Clean the mirrors with a blower
Dirt on the lens Lens Visual check Clean the lens with a
blower
Table 4.8
4.2.2.7 Frequent paper jam
Cause Relevant
Unit Check Method Maintenance Method
Paper setting
failure Operation error Is the paper correctly set in
the paper
chute?
Teach users to properly
position the paper.
Paper failure operation
error Is the specified
paper used?
None
Pad assembly
failure Pad assembly Check the pad assembly if it
has been worn
out.
Replace the pad assembly/
touch spring unit.
Wheel jam
sensor
function failure
Function fail The paper
can’t be fed
into scanner,
but LCD
shows “Error
code 2013
ADF paper
jam”.
Replace the wheel jam
sensor assembly if
necessary.
Table 4.9

4-12
4.2.2.8 Frequent double feed and skew
Cause Relevant
Unit Check Method Maintenance Method
Paper setting
failure Operation error Is the paper correctly set in
the paper
chute?
Teach users to properly
position the paper
Paper failure Operation
error Is the specified
paper used
None
Pad assembly
failure Pad assembly Check the pad assembly for
wear and tear.
Replace the pad
assembly/ touch spring
unit.
Ultrasonic
function failure
Function fail Retry the
ultrasonic
setup or
replace the
ultrasonic
receiver
board.
None
Table 4.10
4.2.2.9 Strange sound generated
Cause Relevant
Unit Check Method Maintenance Method
Paper setting failure Operation
error Is the paper correctly set in the
ADF Input Tray?
Teach users to
properly
position the
paper
paper failure Operation
error Is the specified paper used? None
Motor noise Assembly
error Is the motor correctly assembled
on the metal plate?
None
Table 4.11