Unit Repairing Of The Main Board

This section is necessary only for servicers who repair to the component level. Servicers who perform only board replacement can ignore this section.

The table below lets you troubleshoot problems with the main board (C229MAIN). The table provides various symptoms, likely cases, and checkpoints. Checkpoints include waveforms, resistance, and other value to be checked to evaluate the operation of each component.

Table 3-9. Repair of the C229MAIN

Symptom

Condition

Cause

Checkpoint

Solution

The printer dose not operate at all.

The CPU dose not operate.

The reset circuit is not operational.

Check for the proper voltage waveforms output from the +5VDC line (IC1, pin 3) and for the reset signal (IC1, pin 1) with printer power on.

Replace the

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