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SC CODES
SC
Item
Detection Conditions
No.
SC120 Scanner HP
- Timing & Condition -
sensor does
The scanner H.P. sensor does
not turn on
not turn on when the scanner
moves back to the home
position or at the home
position check.
The sensor output at CN406-7
stays HIGH (5V).
SC121 Scanner HP
- Timing & Condition -
sensor does
The sensor does not turn off
not turn off
when the scanner moves to
the home position after
scanning an original.
The sensor output at CN406-
7stays LOW (0V).
Related
Possible Causes
SCs
• Scanner motor out
SC121
of synchronization
(drive error)
• Poor connection of
connectors
• Defective scanner
HP sensor
• Defective scanner
IPU board
• Defective main
control board
Same as SC120
SC120
2
Troubleshooting Procedure
1. In SP 5-804-104, stop supplying the current to the
scanner motor. Check the output signal from the
scanner H.P. sensor in SP 5-803-100 by moving the
scanner manually. (0: Not actuated; 1: Actuated - at
H.P.)
2. If the result of step 1 is OK;
1
Check the tension of the timing belt.
2
Check if the pulley is firmly secured.
3
Check if the scanner wire is properly wired
4
Check the connection of CN710, and CN731 on
the scanner motor drive board.
5
Check continuity of cables.
6
Replace the scanner motor drive board.
7
Replace the scanner motor.
3. If the result of step 1 is not OK;
1
Check if the cable is properly connected.
2
Check the continuity of cable.
3
Replace the sensor.
4
Replace the scanner IPU board.
5
Replace the main control board.
- Signals to Check -
• Scanner HP: CN406-7 on scanner IPU board
Same as SC120.
24 February 1999
Type
D
D
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