Ricoh B202 Service Manual page 239

SC TABLE
SC No. Item
SC 490 Transfer bias / The high voltage supply board
paper attraction transfer checks the circuit and
roller bias leak detects current leaks. If this
error happens, the high voltage
supply board sends a SC
signal (High to Low at CN213-
8) to the BCU.
The BCU checks this signal
every 2 ms and generates this
SC code when the error
condition occurs 250
consecutive times.
SC 501 Paper Tray 1 When the tray lift motor is
error turned on, (if the upper limit is
not detected within 10
SC 502 Paper Tray 2
seconds), the machine asks
error
the user to reset the tray. If this
condition occurs three
consecutive times, the SC is
generated.
B202/B178/B180
Definition Possible Cause
• Defective high
voltage supply board
- Transfer
•
Damaged transfer
belt
•
Transfer unit
•
Damaged high
voltage supply cables
•
Damaged cables
between the BCU and
high voltage supply
board
•
Defective BCU
• Defective paper lift
sensor
• Defective tray lift
motor
• Defective bottom
plate lift mechanism
Related
Troubleshooting Procedure
SCs
1. Turn the main switch off and on.
2. Check the transfer unit and replace
the belt and/or the transfer unit if it is
damaged.
3. Replace the high voltage supply
board - Transfer.
4. Check and/or replace the high voltage
supply cables.
5. Check and/or replace the dc cables
between the BCU and high voltage
supply board.
6. Replace the BCU.
1. Turn the main switch off and on.
2. Check if the bottom plate smoothly
moves up and down manually.
3. Check and/or replace the paper lift
sensor.
4. Check and/or replace the tray lift
motor.
4-24
Type
D
B
SM