KV-S8147, KV-S8127, KV-S8150, KV-S8130, KV-S8120 - Panasonic Other Service Manuals Service Manual (repair manual). Page 103

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3. Slip Detect 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 Slip 

detect 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. Slip detect Sensor signal (CN18-17th pin)

Approx. 5 V (paper exists)

b. Check the reference signal for the Slip 

detect Sensor signal on the CONTROL 
Board.
IC41-5th pin: Approx. 2.5 V

c. Check comparator output signal.

IC41-7th pin: 5.0 V
 (no paper on the sensor)

5. Replace faulty parts or boards.

4. Mechanical problem (Drive 

Roller, Drive Belt, Conveyor)

1. Execute “Feed motor” and “Conveyor 

motor” tests in Sec. 10.3.7. to check the 
mechanical condition.

2. Check whether the Drive Rollers
    (especially Drive Roller 1), the Drive belt, and
    the conveyor to support the Drive Rollers are
    put together into the scanner, properly.
3. Check the surfaces of the Drive Roller 1.
      a. If it is deformed
          

 Replace the roller.

      b. If the surface is dirty
          

 Clean the surface.

4. Check whether the Drive Belt tension is 

proper.
 Re-adjust the belt tension.

5. Conveyor Motor does not work 

properly.

1. Check the motor mechanism condition by
    carrying out “Conveyor motor” test.

(See Sec. 10.3.7.)

2. Check the connection between the Conveyor 

motor and CN2011 (DRIVE Board) 

3. Try to exchange two of FFC cable between 

the DRIVE Board and the CONTROL Board. 
(If repaired, FFC cable breakage).

4. Replace Conveyor Motor. 

6. Conveyor 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 IC2014 and the 

peripheral parts on DRIVE Board.

3. Check the following signals on the DRIVE 

Board.
a. IC2014-12th pin (CLK): See Fig. 1.
b. IC2014-19th pin (VREF): 2.3V or less.
c. IC2014-15th pin (ENABLE): 3.3 V 
     (when executing Conveyor motor test)

7. DFP Pressure Motor does not 

work properly.

1. Check the motor mechanism condition by 

carrying out “DFP pressure drive” test.
(See Sec. 10.3.7.)

2. Check the connection between DFP Pres-

sure Motor and CN2016 (DRIVE Board)

3. Replace faulty cable.
4. Replace DFP Pressure Motor.