KV-S8147, KV-S8127, KV-S8150, KV-S8130, KV-S8120 - Panasonic Other Service Manuals Service Manual (repair manual). Page 104

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8. DFP Pressure Motor circuit does 

not work properly.

1. Check the following connection and 

soldering on each connector.
 CN15 (CONTROL Board) to CN2008
    (DRIVE Board) 

2. Check the soldering of IC2020 and the 

peripheral parts on DRIVE Board.

3. Check the following signals on the DRIVE 

Board.
a. IC2020-29th pin (CLK): See Fig. 1.
b. IC2020-22,23th pin (VREF): 2.3V or less.
c. IC2020-18th pin (ENABLE): 3.3 V
    (when executing Conveyor motor test)

9. Paper Feed Roller module or 

DFP Roller is not assembled 
properly.

Refer to the 1st item on Error Code U11.

10. Rollers (Paper Feed, 

Separation, DFP) are dirty.

Refer to the 2nd item on Error Code U11.

11. Rollers have reached their life 

expectancy.

Refer to the 3rd item on Error Code U11.

U13 (Conveyor Jam2: 
Paper did not reach the 
Starting Sensor.)

13

00

00

00 1. Document remains between 

Starting Sensor and Slip Detect 
Sensor.

Remove the document from the scanner.

2. Paper dust exists on or around

Starting Sensor.

1. Clean up the dirt with cleaning paper or 

cotton swab or soft and dry cloth. 
(See Sec. 9.)

2. Execute “Key/Sensor” tests in Sec. 10.3.7. 

and “Sensor sensitive level” in Sec. 
10.3.8. to check the Starting Sensor 
condition.

3. Starting Sensor does not work, 

correctly.

1. Execute “Key/Sensor” test in the Sec. 

10.3.7. to check the sensor condition.

2. Check the mounting of the lens of the 

Starting Sensor. 

3. Check the following connection and 

soldering condition on each connector.
a. CN5140 (SLIP/STARTING SENSOR    
    Board) to CN3300 (LOWER RELAY 
    Board)
b. CN3304 (LOWER RELAY Board) to 
    CN18 (CONTROL Board)

4.  Check the following signals.

a. Starting Sensor signal CN18-19th pin:    
    Approx. 5 V (no paper on the sensor) 
b. Check the reference signal for the Starting 
    Sensor signal on the CONTROL Board.
    IC41-3rd pin: Approx. 2.5 V
c. Check comparator output signal.

        IC41-1st pin: 5 V (no paper on the sensor)
5. Replace faulty parts or boards.

4. Mechanical problem (Drive
    Rollers, Drive Belt)

1. Check the  Starting Sensor’s mechanical 

position and its status.

2. Execute “Conveyor motor” test in Sec. 

10.3.7. to check the mechanical condition.

3. Check whether the Drive Rollers (1 and 2), 
    and Drive Belt, and also check whether the
    conveyors to support the Drive Rollers are
     put together into the scanner, properly.
4. Check the surfaces of the Drive Rollers 
    (1 and 2).
     a. If it is deformed

     

 Replace the roller.

 b. If the surface is dirty
     

 Clean the surface.

5. Check whether the Drive Belt tension is
     proper.
     

Re-adjust the belt tension.