KV-S7075C (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 120

120

F38 (ASIC (Back)
SDRAM Error)

9C xx

00 00 Access error to SDRAM

(IC1019, IC1020)

1. Check the soldering condition of the
    parts surrounding the Gate Array
    (IC1013).
2. Replace faulty parts or CONTROL
    Board.

F40 (Hopper error)

30 00 00 00 1. Paper Feed Motor does not

    work properly.

1. Check the motor mechanism condition,
    by carrying out ”Hopper Drive” test in
    Sec. 9.3.6.
2. Check the following connection:
      

→ Paper Feed Motor to CN3026

            (POWER RELAY Board)
3. Replace faulty cables.
4. Replace Paper Feed Motor.

2. Feed Motor control circuit
    does not work properly.

1. Check the following connections and
    soldering condition on each connector:

       

a. CN2004 (CENTER Board) to

          CN4005 (DRIVE Board)
      b. CN4009 (DRIVE Board) to
          CN3021 (POWER RELAY Board)
2. Check the soldering condition of
    IC4007 and its surrounding parts.
3. Check the following signals on the
    DRIVE Board:

     

 a. IC4007-1,3,4 and 5th pins

         (phase signals): See Fig. 10.2.1.
      b. IC4007-19th pin (VREF): 2.5 V
          or less.
4. Replace faulty parts or boards.

3. Hopper mechanical problem
   (Rotation from the Paper
    Feed Motor Gear is not
    transmitted to the Hopper
    properly.)

1. Check the Hopper mechanism
  condition by carrying out "Hopper
  Drive" test. (See 9.3.6.)
    Note: 

2. Reassemble improper lay-out or
    replace faulty parts.

4. Hopper Home Detector does
    not work properly.

1. Execute “Key / Sensor” test in the
    Sec. 9.3.6 to check the detector
    condition.
2. Check whether the Interrupter plate
    interrupts the detector correctly.
3. Check the following connection and
    soldering condition on each connector:
   

→ CN23 (HOPPER HOME DETECTOR

       Board) to CN26(SESOR RELAY
       Board)
4. Check HOPPER_HOME signal:
    

→ CN23-3rd pin (5 V when Interrupter

        plate interrupts IC3005 on the
        HOPPER HOME Board.
5. Check the soldering condition of
    IC2007 on the CENTER Board and
    repair it.
6. Replace faulty parts and boards.