Malfunction Troubleshooting - Canon LBP-1210 Service Manual

CHAPTER 4
V. MALFUNCTION TROUBLESHOOTING
Perform troubleshooting according to the malfunction diagnosis flowchart (Figure 4-1-1). If an
"malfunction" is found, the defective part must be located and rectified by the following proce-
dures.
V-1. No AC power
<Possible causes>
1) Blown fuse (FU101)
Action: Replace the fuse (FU101).
2) The engine controller PCB is defective.
Action: Replace the engine controller PCB.
V-2. No DC power
<Possible causes>
1) No AC power is supplied.
Action: Make a check according to V -1 "No AC power".
2) The overcurrent/overvoltage detection circuit is activated.
Action: Unplug the power cord, wait for two minutes or more, and then plug the cord back.
If the problem still remains, find the cause of activation of the overcurrent/over-
voltage detection circuit in the power supply unit.
3) Blown fuse (FU102)
Action: Replace the fuse (FU102).
4) The engine controller PCB is defective.
Action: Replace the engine controller PCB.
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