KV-S4065CL, KV-S4065CW, KV-S4065CWCN, KV-S4085CL, KV-S4085CW, KV-S4085CWCN - Panasonic Other Service Manuals Service Manual (repair manual). Page 125

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3. Rollers (Paper Feed,
Separation, DFP) are not
assembled properly.

1. Reassemble the rollers.

4. Rollers (Paper Feed,
Separation, DFP) are dirty

1. Clean the rollers.
2. Clear counter for cleaning roller to zero with
the Service Utility. 

5. Rollers have reached their life
expectancy.

1. Replace the Paper Feed, Separation, and
DFP Rollers after checking each roller
configuration and Scanner Counter with the
Service Utility.
2. Clear counter for replacing roller to zero with
the Service Utility.

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

1. Execute “Double Feed” test in Sec. 9.3.7. to
adjust  "Send Level” for Double Feed
Detectors.
2. Execute “Double Feed” test in Sec. 9.3.6. to
check the detector condition.
3. Check whether the Double Feed Detectors
 L(G), C(G), R(G) are aligned property.
4. Check the following connections and
soldering condition on each connector.
   a. CN3011 (DOUBLE FEED DETECTOR
       LCR Board) to CN2012 (RELAY(UPPER)
        Board)
   b. CN2008 (RELAY(UPPER) Board) to
        CN1015 (CONTROL Board)
5. Check the following parts’ soldering
condition to repair it.
   a. CONTROL board
       IC1010-43th pin
       IC1024 (21,23,24, and 27th pins)
   b. RELAY(UPPER) board
      IC2017 (3, 15, 18, 20, 22, 24, and 27th pins)
     Q2000 to Q2015,Q2018 to Q2023, and the
      surrounding circuits.
6. Check the following signals
  a. DC 24V signal (CN2008-3rd pin)
  b. JS_CLK (CN2008 7th pin) 

→

 300 kHz

  c. L_G1 (CN2012-4th pin), L_G2 (CN2012
      -2nd pin), C_G1 (CN2012-5th pin), C_G2
      (CN2012-7th pin), R_G1 (CN2012-10th
       pin), R_G2 (CN2012-12th pin)
      

→

 See Fig. 9.

7. Replace faulty parts or boards