Sc194: Ipu White Level Detection Error - Ricoh Aficio 220 Service Manual

SERVICE CALL CONDITIONS

SC194: IPU White Level Detection Error

Definition: [B]
The level of the white standard pattern detected by the IPU chip (on the BICU
board) is too low.
Possible Causes:
• Exposure lamp defective
• BICU board defective
• Incorrect position of the white standard pattern
• Dirty white plate
• SBU board defective
SC302: Charge roller current leak
-Definition- [B]
A charge roller current leak signal is detected.
- Possible causes -
• Charge roller damaged
• Charge high voltage supply board defective
• Poor connection of the PCU
SC320: Polygon motor error
-Definition- [B]
The polygon motor does not reach its operating speed within 10 seconds after
the polygon motor on signal, or the lock signal is not detected for more than 200
ms continuously during operation.
- Possible causes -
• Polygon mirror motor defective
• Poor connection between the polygon mirror motor driver and the BICU board
• BICU board defective
SC321: No laser writing signal (F-GATE) error
Definition: [B]
The laser writing signal (F-GATE) is still not LOW when the laser writing area +5
mm has passed since the laser writing start position on the drum.
Possible Causes:
• BICU board defective
• EMB (Copier feature expander) board defective
• The fax controller or printer controller has a poor connection.
• Fax controller or printer controller defective
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20 September 1999