The white level peak did not reach the prescribed threshold when the white guide
plate was scanned.
Error detection timing; During the scanner adjustment (detecting the lighting error)
at the time of turning on the scanner (when the main power is turned ON).
• Condensation in the scanner unit
• Connector disconnected
• Scanner Carriage defective
• BiCU (PCB16) defective
• Harness defective
• White Guide Plate dirty or attachment fault
• IOB (PCB17) defective
Check if the SC occurs by turning the main power OFF then ON. If the SC occurs
again, do the following steps. Check if the SC reoccurs by cycling the power after
each step.
1. Reconnect the connector.
Reconnect the following connectors;
• Scanner Carriage – BiCU (PCB16) connector
• SBU (PCB3) – LEDB connector (SBU (PCB3) side connector on the
scanner carriage)
• BiCU (PCB16) – IOB (PCB17) harness
2. Check the white guide plate (exposure glass).
Check the white guide plate attached to the exposure glass. If the white guide
plate is in an unusual state, replace the white guide plate.
3. Scanner carriage defective
Replace the scanner carriage.
4. BiCU (PCB16) defective
Replace the BiCU (PCB16).
5. Harness defective
Replace the following harnesses.
• Scanner Carriage – BiCU (PCB16) harness
• BiCU (PCB16) – IOB (PCB17) harness
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