POWER-ON SELF TEST
SM 3-7 B441
Printer Unit
B441
3.4 POWER-ON SELF TEST
The controller tests the following devices at power-on. If an error is detected, an
error code is stored in the NV RAM. Refer to section 3.2.4 for how to check the
error codes, and section 2.1 for the details about error codes.
• CPU
• Flash ROM
• Font ROM
• Code ROM
• Resident and optional SDRAM
• Parallel interface
• NIB (If this board is installed)
• Centronics Interface (if a loop-back connector is present)
• NVRAM
3.5 SELF DIAGNOSTIC TEST
In addition to the power-on self-test, you can set the machine in a more detailed
diagnostic mode to test other components and conditions.
It requires a loop-back connector (P/N: G0219350).
1. Turn off the machine and attach the loop-back connector to the parallel
interface.
2. Turn on the machine while pressing the “On Line” key and “OK” key together.
3. The machine prints the diagnostic report automatically.
• Refer to section 3.2.4 for how to check the error codes.
• Refer to section 2.1 for the details about the error codes.
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