KV-S7075C (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 115

115

U14 (Conveyor
Jam3: Paper did not
reach the Ending
Sensor.

14 00 00 00 1. Document remains between

    Starting Sensor and Ending
    Sensor.

Remove the document from the scanner.

2. Paper dust exists on or
   around the Ending Sensor.

1. Blow off the dust with the included
    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. ENDING 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 connections and
   soldering condition on each connector:
     a. CN22 (ENDING SENSOR Board) to
         CN11 (SENSOR RELAY Board)
     b. CN29 (SENSOR RELAY Board) to
         CN2006 (CENTER Board)
4. Check the following signals:
    a. PEXIT signal (CN11-2nd or CN29-
        7th pin)
       

→ 0 V (when none exists on the

             Ending Sensor)
    b. Check the reference signal for the
         PEXIT signal on the CENTER Board.
           IC2021-2nd pin: 1.5 V or less
           IC2021-3rd pin: Approx. 1.5 V
 c. Check comparator output signal.
     

→ IC2024-1st pin: 3.3 V (when no

        document exists)
5. Replace faulty parts or cables.

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

1. Execute "Conveyor Motor" test in
    Sec.9.3.6 to check the mechanical
    condition.
2. Check whether the Drive Rollers(3, 4),
    Drive Belt, and the conveyor to
    support the Drive Rollers are
    assembled properly in the scanner.
3. Check the surfaces of the Drive Rollers
    (3, 4

).

        a. Configuration:
           Are the rollers swollen irregularly?
            

→ Replace the rollers.

        b. Whether the roller surfaces are
            dirty
           

→ Clean the surfaces.

4. Check whether the Drive Belt tension is
    proper.