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2-24 Service Manual
4227-X00
POST Service Check
FRU Action
1 Power Disconnect the parallel or serial cable and turn
power on.
If there is no printer activity, go to the
“Power
Failure Service Check” on page 2-25
.
2 Operator Panel If the power supply fan turns on but no LEDs
light,gotothe
“Operator Panel Service
Check” on page 2-19
.
3 Main Logic Board If the Power LED turns on but POST does not
complete, replace the main logic board.
Readjust the
“Bidirectional Print
Adjustment” on page 4-4
and check the
“Printhead-to-Platen Gap Adjustment” on
page 4-2
.
4 Printer Cable If POST completes, reconnect the parallel or
serial cable and turn power on again.
If POST now fails, there is a problem with the
cable, or the parallel connector on the main
logic board.