KV-S7075C (serv.man2) - Panasonic Other Service Manuals Service Manual (repair manual). Page 117

117

U20 (Skew Error)

19 00 00 00 1. Document on the Hopper

   Tray is not set correctly.

Set the document on the Hopper Tray,
sliding the Document Guides so that they
match the document width and execute
scanning again.

2. ADF Door is not closed
    firmly.

Close the door firmly. 

3. A roller (Paper Feed,
   Separation, DFP, Drive, Exit,
   or Free) is dirty.

1. Clean the roller.
2. Clear the counter for cleaning roller to
    zero with the Service Utility described in
    Sec. 9.

4. A roller (Paper Feed,
   Separation, DFP, Drive, or
   Exit) is swollen irregularly.

1. Replace the roller. 
2. After replacing Paper Feed, Separation,
   and DFP Rollers, clear the counter for
   replacing roller to zero with the Service
   Utility described in Sec. 9.

5. Paper dust exists on or
   around a Skew Sensor.

Clean the sensor surface.

6. The Skew (L) Sensor does
    not work properly.

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
   its reflector.) 
3. Check the following connections and
    soldering condition on each connector: 
      a. CN13 (STARTING SENSOR
          Board) to CN12 (SENSOR RELAY
          Board) 
      b. CN29 (SENSOR RELAY Board) to
          CN2006 (CENTER Board) 
4. Check the following signal: 
      a. SKEW_L signal (CN2006-12th pin)
        

→3.3 V (when no document exists on

           the SKEW_L Sensor) 
      b. Check the reference signal for the
          SKEW_L signal on the CENTER
          Board.
      

→ IC2027-4th pin: 3.3 V (when no

          document exists)
5. Replace faulty parts or boards. 

7. The Skew (R) Sensor does
    not work properly

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 its
   reflector) 
3. Check the following connections and
    soldering condition on each connector: 
       a. CN13(STARTING SENSOR Board)
           to CN12(SENSOR RELAY Board) 
       b. CN29 (SENSOR RELAY Board)
           to CN2006(CENTER Board 
4. Check the following signals:

   

a. SKEW_R signal (CN2006-13th pin)

    

→ 3.3 V (when no document exists on

        the SKEW_R Sensor) 
  b. Check the reference signal for
      the SKEW_R signal on the CENTER
      Board. 
    

→ IC2027-3rd pin: 3.3 V (when no

        document exists)
5. Replace faulty parts or boards.