KV-S7075C (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 122

122

4. Carriage Home Detector
    does not work correctly.

1. Check the alignment of the Carriage
    Home Detector and its actuator is
    proper.
2. Execute “Key / Sensor” test in
    Sec.9.3.6 to check the sensor condition.
3. Check the following connection and
    soldering condition of each connector.
     a. CN10 (CARRIAGE HOME
         DETECTOR Board) to CN2005
         (CENTER Board)
4. Check the soldering condition of 
    IC3 and its surrounding circuit on the
    CARRIAGE HOME DETECTOR Board
     to repair it.
5. Check the following signals.
    

→

 CAHOME signal (CN10-2nd pin on

         the CARRIAGE HOME DETECTOR
         Board, IC2027-8th pin on the
         CENTER Board): Approx. 3 V (when
           the actuator interrupts the detector)
6. Replace faulty parts or boards.

F50 (Waiting 
Sensor's adjustment
error)

40 00 00 00 1. Paper dust exists on or

   around the Waiting Sensor.

1. Blow off the dust with the included
    accessory blower. (See 7.2.)
2. Execute “Key / Sensor” and “Sensor
    Sensitive Level” tests in Sec.9.3.6 to
    check the sensor condition.

2. Waiting Sensor does not
   work correctly.

Refer to the 5th item on the Classification
Code U11.

F51 (Starting
Sensor's adjustment
error)

41 00 00 00 1. Paper dust exists on or

   around the Starting Sensor.

1. Blow off the dust with the included
    accessory blower. (See 7.2.)
2. Execute “Key / Sensor” and “Sensor
    Sensitive Level” tests in Sec.9.3.6 to
    check the sensor condition.

2. Starting Sensor does not
    work correctly.

Refer to the 3rd item on the Classification
Code U12.

F52 (Skew (R)
Sensor's adjustment
error) 

42 00 00 00 1. Paper dust exists on or

   around the Skew (R) Sensor.

1. Blow off the dust with the included
    accessory blower. (See 7.2.)
2. Execute “Key / Sensor” and “Sensor
    Sensitive Level” tests in Sec.9.3.6 to
    check the sensor condition.

2. The Skew (R) Sensor does
    not work correctly.

Refer to the 7th item on the Classification
Code U20.

F53 (Skew (L) 
Sensor's adjustment
error) 

43 00 00 00 1. Paper dust exists on or

   around the Skew (L) Sensor.

1. Blow off the dust with the included
    accessory blower. (See 7.2.)
2. Execute “Key / Sensor” and “Sensor
    Sensitive Level” tests in Sec.9.3.6 to
    check the sensor condition.

2. The Skew (L) Sensor does
    not work correctly.

Refer to the 6th item on the Classification
Code U20.

F55 (Ending 
Sensor's 
adjustment error)

45 00 00 00 1. Paper dust exists on or

    around the Exit Sensor.

1. Blow off the dust with the included
    accessory blower. (See 7.2.)
2. Execute “Key / Sensor” and “Sensor
    Sensitive Level” tests in Sec.9.3.6 to
    check the sensor condition.

2. Ending Sensor does not
    work correctly.

Refer to the 3rd item on the Classification
Code U14.