Malfunction troubleshooting If the malfunction is identified, use the following table for troubleshooting: Table 23. Malfunction troubleshooting C8523-90921 Power on 193 Cause Solution No ac power Defective power supply assembly Replace the power supply assembly. Defective remote function Reconnect connectors J404 and J405 on the intermediate PCB, intermediate connector J171, and connector J206 on the dc controller on the print engine. No dc power No ac power is supplied Check for ac power. The over-current/over-voltage detection circuit is activated Turn off the MFP, wait approximately two minutes, and then turn it back on.
If the problem persists, find the cause of the overcurrent/overvoltage detection circuit activation in the power supply assembly. Defective power supply assembly Replace the power supply assembly. Defective wiring, dc loads, or scanner controller PCB Turn off the power switch. Check the wiring ahead of the scanner controller PCB and the dc loads. If you discover the problem, replace the wiring and dc loads. If no problem exists on the wiring or dc loads, replace the scanner controller PCB.