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24 February 1999
SC
Item
Detection Conditions
No.
SC741 Optional paper
The paper tray unit self-
tray unit error
diagnostics detect an error
and notify the main control
board.
Detection timing: Just after
power is turned on or when
the paper tray unit is running.
SC790 Projector lamp
- Timing & Condition -
on error
The projector lamp does not
turn on 100 ms after 5V is
applied to it.
SC791 Projector lamp
- Timing & Condition -
off error
The projector lamp does not
turn off 100 ms after it is
turned off.
SC792 Projector lamp
- Timing & Condition -
overheated
The projector lamp overheats
during projector operation.
Related
Possible Causes
SCs
Defective paper tray
unit control board
• Poor connection of
connector
• Blown projector
lamp
• Defective projector
main board
• Defective projector
main board
• Defective scanner
IPU board
• Defective main
control board
• Poor connection of
connector
• Defective
thermistor
• Defective projector
main board
29
Troubleshooting Procedure
Defective paper tray unit control board: Replace.
1. Check if the connector is properly connected.
2. Replace the projector lamp if it is blown.
3. Replace the projector main board.
Replace the projector main board.
Replace the scanner IPU board.
Replace the main control board.
1. Check if the connector of the fan is properly connected.
2. Replace the fan if it is defective.
3. Replace the thermistor if it is defective.
4. Replace projector main board.
SC CODES
Type
B
B
B
B
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