KV-S4065CL, KV-S4065CW, KV-S4065CWCN, KV-S4085CL, KV-S4085CW, KV-S4085CWCN - Panasonic Other Service Manuals Service Manual (repair manual). Page 126

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7. Double Feed Detector L(R),
C(R), or R(R) does not work
correctly.

1.Execute “Double Feed” test in Sec.9.3.6 to
check the detector condition.
2. Check whether the Double Feed Detectors
L(R), C(R), and R(R) are aligned property.
3. Check the following connections and
soldering condition on each connector.
  a.CN2002 (DOUBLE FEED DETECTOR R
     Board) to CN2005 (RELAY (LOWER)
      Board)
  b.CN2001 (DOUBLE FEED DETECTOR C
     Board) to CN2004 (RELAY (LOWER)
      Board)
  c.CN2000 (DOUBLE FEED DETECTOR L
     Board) to CN2003 (RELAY (LOWER)
      Board)
  d.CN2007 (RELAY(LOWER) Board) to
      CN1014 (CONTROL Board)
4. Check the following parts’ soldering
  condition to repair it.
  a. CONTROL Board
       IC1010 - 117,118, and 119th pins
  b. RELAY (LOWER) board
       All parts.
5. Check the following signals on the RELAY
    (LOWER) Board.
      a. DC 12 V signal (CN1014-7th pin)
      b. DC 5 V signal (CN1014-5th pin)
6. Replace faulty parts or boards. 

U24 (Detect document
with staples (Skew
detection))

1D

00

00

00 One of the Skew Sensors detected 

document skew.

1. Refer to each item on classification code
    U20. 
2. Check whether the scanned documents are
    stapled.
3. Set the documents neatly on the Hopper,
    and then scan them again. 

U25 (Detect document
with staples (Double-
feed detection) 

1E

00

00

xx

Double Feed Detector detected
a double-feed.

1. Refer to each item on classification code
    U23. 
2. Check whether the scanned documents are
    stapled.
3. Set the documents neatly on the Hopper,
    and then scan them again. 

U26 (Bent Paper was
detected.)

1F

xx

00

00 1. Bent Paper was detected.

1. Check whether the scanned documents are
    stapled.
2. Set the documents neatly on the Hopper,
    and then scan them again.