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61

LED does not light
up.

1. Power cord is not inserted correctly.

Insert the power cord correctly.

2. Cables in the scanner are not 

connected properly. (especially around 
Power Supply)

Insert the cables properly.

3. Power Board does not work, properly.

1. Measure the following voltage on CONTROL Board.

CN21  4-5th pin: +24V

2. Check the connection between the Control Board and 

Power Board.

3. Replace Power Board.

4. Power Switch on LCD PANEL Board 

does not work, properly.

1. Check the following connection.

(1) CN4000 (LCD PANEL Board) and CN10 (CONTROL 

Board)

(2) FFC Cable

2. Measure the following resistance value, when the power 

cord is unplugged.
(1) CN4000 10th pin – GND : 0 Ω (SW4007 ON)
(2) CN4000 10th pin – GND : over 10kΩ (SW4007 OFF)

3. Replace SW4007 or LCD PANEL Board.

5. Boot program of this scanner does not 

work, correctly.

Replace CONTROL Board

6. DC ON/OFF circuit on CONTROL 

Board does not work correctly.

1. Monitor the following signals. (when turning on the power)

(1) Q51-G : Typ. 12 V
(2) Q48-C : Typ. 11 V
(3) Q50-B : Typ. 0.6 V
(4) +7.0V (CL189) : Typ. 7V

2. Check the soldering condition of the following parts and of 

their surrounding circuits on the CONTROL Board. 
Q48, Q50, Q51

3. Monitor the following signals.

(1) Q48 (C-E) : Typ. 0 V
(2) Q50 (C-E) : Typ. 0 V

4. Replace faulty parts.

7. CONTROL Board does not work 

properly.

1. Perform the "LED" test in Sec. 

 to check the LED 

ON/OFF status.

2. Check whether all connections and cables on the 

CONTROL Board are normal.

3. Check the soldering condition of the following parts and of 

their surrounding circuits on the CONTROL Board.
(1) +1.2V (CL196) : Typ. 1.2V
(2) +7V (CL189)    : Typ. 7.0V
(3) +3.3V (CL190) : Typ. 3.3V
(4) IC9 (PF4)
(5) IC6 (Reset IC)

4. Check the soldering condition of the following parts on the 

CONTROL Board.
(1) CN10

5. Monitor the following signals. 

CN10-8th pin : +3.3V

6. Replace faulty parts or CONTROL Board.

8. LCD PANEL Board does not work 

properly.

1. Perform the "LED" test in Sec. 

 to check the LED 

ON/OFF status.

2. Check the following connection.

between CN4000(LCD PANEL Board) and CN10 
(CONTROL Board)

3. Check the soldering condition of the following parts on the 

LCD PANEL Board.
(1) CN4000
(2) IC4000

4. Monitor the following signals on the CN4000. 

CN4000-3pin : +3.3V

5. Replace faulty parts or LCD PANEL Board.

62

Scanner does not 
recognize USB 
connection.

1. USB cable is not connected normally.

1. Check the device (USB) condition of PC with Device 

Manager.

2. Re-attach the USB cable, and then restart the scanner 

and PC.

3. Replace the USB cable.

2. USB interface circuit does not work.

1. Check the soldering condition of the following parts and of 

their surrounding circuits on the CONTROL Board, and 
then repair it.
(1) JK3 (USB IF connector)
(2) LF4 (Common mode filter)
(3) LF6 (Common mode filter)
(4) IC9 (PF4)

2. Replace the CONTROL Board.

START/STOP Button, 
Skip Button, or Cursor 
Button don’t work 
properly.

1. Mechanical problem with ON/OFF 
    switch.

1. Perform the "Key / Sensor" test in Sec. 

 to check 

following button's ON/OFF status.
(1) [Start/Stop] SW4100 on PANEL SWITCH Board
(2) [Skip] SW4101 on PANEL SWITCH Board
(3) [Up] SW4102 on PANEL SWITCH Board
(4) [Down] SW4103 on PANEL SWITCH Board
(5) [Left] SW4104 on PANEL SWITCH Board
(6) [Right] SW4105 on PANEL SWITCH Board
(7) [Set] SW4106 on PANEL SWITCH Board

2. Check the button’s ON/OFF mechanical condition.
3. Replace faulty parts.

2. ON/OFF monitor circuit does not 

function.

1. Check the soldering condition of the following parts and of 

their surrounding circuits on the PANEL SWITCH Board.
(1) SW4100, R4101
(2) SW4101, R4102
(3) SW4102, R4100
(4) SW4103, R4106
(5) SW4104, R4105
(6) SW4105, R4103
(7) SW4106, R4104

2. Check the following connection.

(1) Between CN4000 (LCD PANEL Board) and CN10 

(CONTROL Board)

(2) FFC Cable
(3) Between CN4002 (LCD PANEL Board) and CN4100 

(PANEL SWITCH Board)

3. Check the soldering condition of the following parts and 

their surrounding circuits on the CONTROL Board.
(1) CN10

4. Check the following signals on the LCD PANEL Board.

IC4000

5. Replace faulty parts or boards.

Scanning position is 
shifted.

1. After replacing or re-assembling the 

CIS assembly and/or mechanical parts 
related to conveying documents, 
re-adjustment of scanning position has 
not been done.

1. Perform the "All Position" and/or "Individual Position" 

 so that the scanning position can be 

adjusted properly.

2. The CIS assembly is not installed 

properly. 

1. Re-assemble the CIS Assembly. (See Sec 

 & 

63

The document skews 
when scanned.

1. Document Guides are not set properly 

according to the size of documents on 
the Feed Tray.

1. Slide and set the Document Guides according to the 

document size.

2. Mixed Batch Card Guide is not set 

properly.

1. Set the guide properly.

3. ADF Door is not closed tightly.

1. Close the door until it clicks into place, after opening it.

4. Rollers are dirty. 

1. Clean the rollers with the roller cleaning paper.
2. After cleaning the Paper Feed Roller and Double Feed 

Prevention Roller, perform the "Clear Counter (After 
Clean Roller)" in the service utility to clear the cleaning 
roller counter. (See Sec. 

)

5. Rollers are not properly installed into 

their default positions when re-
assembling.

1. Check the roller attachments to the scanner (whether a 

gap between roller and conveyor is secured equally).

2. Re-attach the rollers to their default positions.

6. Rollers have reached their life 

expectancy.

1. After checking the configuration, replace the rollers.
2. After replacing the Paper Feed Roller and Double Feed 

Prevention Roller, perform the "Clear Counter (After 
Replace Roller)" in the service utility to clear the roller 
replacement counter. (See Sec. 

Scanned image data 
have black lines, white 
lines, or darker image 
than the original or 
brighter image than the 
original.

1. Shading data stored in CONTROL 

Board is not proper to perform an 
image process.

1. Perform the "Shading" in Sec. 

 to over-write new 

data.

2. The dust exists on the Scanning Glass 

((F) or (B)) or its surrounding 
(Reference area or others).

1. Wipe off the dust with soft and dry cloth.
2. Perform the "Focus" test in Sec. 

 to monitor the 

CIS’s output level.

3. CIS (F) Unit does not work properly.

*KV-S1028Y/S1027C : CN2

1. Execute "Focus" test in Sec. 

 to check the 

waveform of CIS output.

2. Execute "CIS LED" test in Sec. 

 to check the 

lighting of each RGB.

3. Check the following connections and soldering condition 

on each connector.
CIS (F) Unit to CN1*(CONTROL Board)

4. Check the power supply for LED.

(1) CN1*-4th pin, F1: 7.0 V
(2) L3, L6, L7, Q7, Q8, Q9

5. Replace faulty parts or boards.

4. CIS (B) Unit does not work Properly.

*KV-S1028Y/S1027C : CN4

1. Execute "Focus" test in Sec. 

 to check the 

waveform of CIS output.

2. Execute "CIS LED" test in Sec. 

 to check the 

lighting of each RGB.

3. Check the following connections and soldering condition 

on each connector.
CIS (B) Unit to CN3*(CONTROL Board)

4. Check the power supply for LED.

(1) CN3*-4th pin, F1: 7.0 V
(2) L8, L9, L10, Q9, Q10, Q12

5. Replace faulty parts or boards. 

5. Background Plate switching is not 

working properly.

1. Execute "Focus" test in Sec.

 to check the 

peaklevel when Background Color is White and Black.

When scanning short 
documents, the ejecting 
sound is larger than the 
normal sound.

If the length of a document is less than 
about 148 mm, feeding speed control will 
be activated for exiting documents; this is 
normal behavior.

This is normal operation.

Noise

1. Problem with conveyor motor, bearing, 

roller or gear.

1. Perform the "Conveyor Motor" test in Sec. 

 to 

check the sound source.

2. Replace the faulty parts.

64

Hold the document before opening the ADF Door when a paper jam error occurred, to get the stop position of the document.
U11: Document 
did not reach to 
the Starting 
Sensor position. 
(Document 
remains 
between the 
Starting Sensor 
and Paper 
Sensor.)

11

00

00

00 1. Rollers (Paper Feed, DFP) 

are dirty.

1. Clean the rollers with Roller Cleaning Paper.
2. After cleaning the rollers, perform the "Clear 

Counter (After Clean Roller)" in Sec. 

2. Paper Feed Roller or DFP 

Roller is not installed 
properly.

1. Re-attach the roller. (See Sec. 

8.3.1. & 8.4.1.)

3. Rollers have reached their 

life expectancy.

1. Replace the Paper Feed and DFP Rollers after 

checking each roller configuration and scanner 
counter of Service Utility.

2. Perform the "Clear Counter" for replacing roller in 

4. ADF Door is not closed 

tightly.

1. After opening the door, close it slowly until it clicks 

into place.

5. Paper dust exists on or 

around the Starting Sensor.

1. Clean up the dirt with cotton swab.(See Sec. 

2. Execute "Key / Sensor" test in Sec. 

 

and 

"Sensor Sensitive Level" adjustment in Sec. 

 to check the sensor condition.

6. Starting Sensor does not 

work correctly.

1. Execute "Key / Sensor" test in Sec. 

 and 

"Sensor Sensitive Level" test in Sec. 

 to 

check the sensor condition.

2. Check the sensor alignment is proper. (whether the 

sensor direction faces to its Sensor Lens)

3. Check the following connection and soldering 

condition on each connector.
(1) CN2301 (STARTING SENSOR Board) to CN14 

(CONTROL Board)

4. Check the following signals.

a. STARTING input level. 

CN14-7th : 2.5 V - 3.3 V
(when nothing on the Starting Sensor)

b. Check the STARTING LED level.

CN14-6th : 1.9V - 2.6V

5. Replace faulty parts or cables.

7. Conveyor Motor or 

mechanical parts (gear and 
others) do not work properly.

1. Perform the "Conveyor Motor" test or "Feed" test 

in Sec. 

 to check whether the motor drives 

the Paper Feed Roller through the gears, the 
pulleys and the belt properly.

2. Check the following connection and soldering 

condition.
CN12 (CONTROL Board) to Conveyor Motor

3. Monitor the following signals.

CN12- 1, 2, 3, and 4th pins.
(See 

4. Replace faulty parts or board.