3-106 Phaser 7500 Printer Service Manual
Error Messages and Codes
Serial I/O Fail
The Serial I/O control clock is not input into the Motor Drive PWB.
Applicable Chain-Link Code
• 041-347: Serial I/O Fail
Initial Actions
• Power cycle the printer.
• If the problem persists, follow the procedure below.
1. Turn the power Off and On.
2. Check whether there is poor connection of the connectors between the Motor
Drive PWB and the MCU PWB.
3. If no problems are found, replace the following parts in sequence:
• Motor Drive PWB (REP 18.13, page 8-204)
• MCU PWB (REP 18.12, page 8-202)
Troubleshooting Reference
Applicable Parts Wiring and Plug/Jack Map References
■ MCU PWB, PL18.3.6
■ Motor Drive PWB, PL18.3.7
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