KV-S5055C (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 108

108

7. Paper Feed Motor control circuit 
does not work, properly. 

1. Check the following connection and 
    soldering condition on each connector.
    

→ CN1002 (CONTROL Board) to CN4002

         (DRIVE Board)
2. Check the soldering condition of IC4008 and
    its surrounding parts.
3. Check the following signals on the
    DRIVE Board.

a. IC4008-12th pin (CLK)
    See Fig. 2.
b. IC4008-19th pin (VREF): 2.5 V or less.
c. IC4008-15th pin (ENABLE): 0 V 

        (when executing Feed Motor test) 
4. Check the soldering condition of IC0006 and
    IC0015 on the CONTROL Board to repair it.
5. Replace faulty parts or boards.

U12 (Conveyor Jam1: 
Paper did not reach the 
Slip Detect Sensor.)     

12

00

00

00

1. Document remains between
Waiting Sensor and Slip Detect
Sensor.

Remove the document from the scanner.

2. Paper dust exists on or around
the Slip Detect Sensor.

1. Blow off the dirt with the accessory blower.
    (See Sec.7.)
2. Execute Key/Sensor and Sensor
    Sensitive Level tests in Sec.9.3.6 to check
     the sensor condition.

3. Slip detect sensor does not 
work, correctly.

1. Execute Key/Sensor test in the Sec. 9.3.6 to
    check the sensor condition.
2. Check the sensor alignment is proper.
     (whether the sensor direction faces to its
      reflector)
3. Check the following connection and
    soldering condition on each connector.

a. CN2013 (SLIP DETECT SENSOR Board)

        to CN3008 (BENT RELAY Board)

b. CN3005 (BENT RELAY Board) to CN2007

        (USS RELAY Board)

c. CN2006 (USS RELAY Board) to CN1008

        (CONTROL Board)
4. Check the following signals.

a. IMP_START signal (CN2007-11th pin,

        CN1008-3rd pin)

→ 0 V (when nonexistence on the Slip

        Detect Sensor)

b. Check the reference signal for the

        IMS_START signal on the CONTROL
        Board.

    IC0024-3rd pin: 1.5 V or less
    IC0026-2nd pin: Approx 1.5 V
c. Check comparator output signal.
→ IC0017-7th pin: 3.3 V 

         (when no document exists)
6. Replace faulty parts or boards.

4. Mechanical problem (Drive 
Roller, Drive Belt, Conveyor)

1. Execute Feed Motor and Conveyor Motor
    tests in Sec. 9.3.6 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. Configuration:
         Do the rollers swell irregularly?
          

→ Replace the roller.

 
      b. Whether the roller surface is dirty
          

→ Clean the surface.

4. Check whether the Drive Belt tension is
    proper.
          

→ Re-adjust the belt tension.