Ricoh BR-C1a Basic Service Training page 166

 AC Drive Board. Supplies AC power for the PSUs, fusing lamps,
and anti-condensation heaters.
 PSU A, B, C (Power Supply Units). Convert AC (AC 200V to 240V)
to DC (5V, 24V).
 PSU-A supplies power to the operation panel, laser unit, paper
 PSU-B supplies 5V power for the machine in low energy mode,
 PSU-C supplies power for image creation components and
 AC Drive Board Fuses
 FU401: PSU-A. Machine will not power on.
 FU403: PSU-B. Freezes at "Please Wait", machine does not boot.
 FU404: PSU-C. Freezes at "Please Wait", displays SC670-00
 PSU-B Fuses
 FU3: 24V Not Used
 FU4: 24V for ADF (ADF disabled)
 FU5: 24V for scanner unit (scanner unit disabled)
 PSU-C Fuses
 FUS001: Main power. Machine does not boot.
Slide 166
No additional notes
Summary of Board Functions - 3
transport, and fusing (except lamps)
and supplies power to the LCT (option).
finishers.
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BR-C1 Training