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24 February 1999
SC
Item
Detection Conditions
No.
SC501 1st paper tray
- Timing & Condition -
• The upper limit sensor
error
does not turn on1.5 s after
the tray bottom plate starts
to go up.
SC502 2nd paper tray
Same as SC501
error
SC503 3rd paper tray
Same as SC501
error
SC504 4th paper tray
Same as SC501
error
SC510 Paper feed
- Timing & Condition -
• The feedback signal from
motor error
the motor is still out of
range 1 second after the
trigger signal is sent.
• The feedback signal
becomes out of range for 2
seconds while the trigger
signal is on.
Related
Possible Causes
SCs
• Defective upper
SC502
limit sensor
SC503
• Defective tray
SC504
bottom plate
• Defective I/O
control board
• Defective main
control board
SC501
SC502
SC504
SC501
SC502
SC503
• Poor connection of
connector
• Defective paper
feed motor
• Defective I/O
control board
• Defective main
control board
• Mechanical
overload
17
Troubleshooting Procedure
1. Check if the spring of pick-up solenoid comes off.
2. Check if the sensor cable is properly connected.
3. Clean or replace the sensor and replace it if necessary
(Input Check: SP 5-803-14 to 17).
4. Replace the tray bottom lever if it is broken.
5. Pull out the paper tray and check if the tray lift motor
works properly (Output Check: SP 5-804-75 to 82).
6. Replace the I/O control board.
7. Replace the main control board.
- Signals to Check -
• Limit sensor H.P.: CN226-2 or TP206 on I/O control
board
Same as SC501
Same as SC501
Same as SC501
1. Check if the connector is properly connected on the I/O
control board (CN224).
2. Replace the paper feed motor. (Output check: SP 5-
804-08 to 09)
3. Replace the I/O control board.
4. Replace the main control board.
5. Check the feed unit drive section and if anything
causes overload.
- Signals to Check -
• Motor OK: CN224-B4 or TP297 on I/O control board
SC CODES
Type
B
B
B
B
D
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