KV-S8147, KV-S8127, KV-S8150, KV-S8130, KV-S8120 - Panasonic Other Service Manuals Service Manual (repair manual). Page 109

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109
2. One or more of the Bent Paper 
Sensors do not work correctly
1. Execute “Key/Sensor” test in Sec. 10.3.7.  
to check Bent Paper Sensors' condition while 
covering the sensors with clean white paper.
2. Check the mounting of the left and right 
BENT PAPER S SENSOR Board and BENT 
PAPER R SENSOR Board.
3. Check the following connections and 
soldering condition on each connector.
a. CN3000 (UPPER RELAY Board) to 
    CN5000 (BENT PAPER R SENSOR 
    Board)
b. CN5001 (BENT PAPER R SENSOR 
    Board) to CN5020 (BENT PAPER S 
    SENSOR Board)
4. Check the following parts' soldering condition 
to repair it.
a. UPPER RELAY Board
    IC3004 (4 to 7, 9, and 10th pins)
    IC3005 (2 to 5, 18, and 19th pins)
    IC3000 to IC3003, IC3007, IC3008,  
    Q3000, Q3001, Q3004, Q3005, and 
    their surrounding circuits.
5. Check the following signals of UPPER 
RELAY Board.
a. CN3000-4,10th pin : 12 V
b. CN3000-3rd pin (BPS_D_L): See Fig.2.
c. CN3000-9rd pin (BPS_D_R): See Fig.2
6. Replace faulty parts or boards.
U28 (Feed tray is full)
26
00
00
00 1. The feed tray is full.
Remove the documents from the tray, open the 
ADF door, and then close it.
2. Hopper Upper Limit Sensor does 
not work correctly.
1. Check the following connection and solder-
ing condition on each connector.
a. CN5090 (Hopper Upper Limit Sensor 
Board) to CN3001 (UPPER RELAY 
Board).
b. CN3004 (UPPER RELAY Board) to 
CN19 (CONTROL Board).
2. Check the soldering condition of 
IC32 (Control Board).
U30 (ADF Door was 
open.)
20
00
00
00 1. Door is not completely closed.
Close the door completely.
2. Door Switch (Micro switch) does 
not work correctly.
1. Execute “Key/Sensor” in Sec. 10.3.7. to 
check the door switch ON/OFF condition.
2. Check the condition between the Door 
Switch and CN2005 on DRIVE Board.
3. Check the Door Switch mechanical 
condition.
4. Replace a faulty cable.
5. Replace the Door Switch.
3. The monitor circuit that checks 
the door ON/OFF condition is 
broken.
1. Execute “Key/Sensor” in Sec. 10.3.7. to 
check the door switch ON/OFF condition.
2. Check CN2005-2nd pin: 24 V.
3. Check CN2009-2nd (DOOR signal).
 +5 V (when the door is open)
   0 V (when the door is closed)
4. Replace a faulty cable.
5. Replace the DRIVE Board.
6. Replace the CONTROL Board.
U32 (Post-imprinter 
door was open.)
22
00
00
00 1. Door is not completely closed.
Close the door completely.
2. Door Switch (POST-IMPRINTER 
DOOR SENSOR Board) does 
not work correctly.
1. Execute “Key/Sensor” in Sec. 10.3.7. to 
check the Post-Imprinter door switch ON/
OFF condition.
2. Check the condition between the POST-
IMPRINTER DOOR SENSOR Board and 
CN6 on CONTROL Board.
3. Replace a faulty cable.
4. Replace the POST-IMPRINTER DOOR 
SENSOR Board.
5. Replace the CONTROL Board.
Error Code
ST1 ST2 ST3 ST4
Possible Cause
Recommended action
Remarks
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