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Service Guide ML520/521
Chapter 4 Failure & Repair Analysis
RAP 01 No Power Supplied to Printer
START
The printer does not power On when the AC switch is turned ON.
Check the AC cable.
Is it correctly connected?
Yes Check the fuse on the power supply board and F1 of the main control board. Are they open?
No Go to A.
Yes Replace the fuse(s) with fuse(s) of the same rating.
Is the problem resolved?
Yes End of procedure.
No Go to A.
B
No Remove the cable from CN3 on the main control board.
Refer to Appendix A of this Service Handbook for voltage check points on CN3 of the main control
board. Check the output voltages of the secondary of the transformer.
Replace the following in the order listed below. Check operation before replacing next item in list.
1. Operation Panel.
2. Power Transformer.
Has the problem been resolved?
Yes End of procedure.
No Contact Technical Support.
A
Remove the cable from CN7 of the main control board. Then, power ON the unit.
Do the operation panel LEDs light?
No Go to B.
Yes Power OFF the unit. Remove the printhead. Power ON the unit.
Has the problem been resolved?
Yes Replace the printhead.
Has the problem been resolved?
Yes End of procedure.
No Go to B.
No Replace the following in the order listed below. Check operation before replacing next item in list.