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.
1. Ribbon Feed Mechanism.
2. Carriage Cable.
3. Main Control Board
4. PROM 05CA
Has the problem been resolved?
Yes End of procedure.
No Contact Technical Support.
Microline 520/521 Service Handbook 4 - 25 Failure Analysis
P/N 59257803
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