4. Troubleshooting
4203
7/7
4203
Diagnosis appendix for the failures: Symptom due to the connection failure of wiring
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! Earth leakage circuit breaker (NFB3)
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! Earth leakage circuit breaker (NFB4)
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! Checking condition of wiring connection failure
This section explains the errors and symptoms seen when the power supply of this system is turned on with the connector of each PCB
unplugged (for example, the monitor is not turned on, the lamp does not light, the fan does not rotate).
IMPORTANT
• Symptoms that appear when the connectors of each PCB are disconnected are explained.
• For the PCBs of the processor, the PCBs only for normal specifications are mentioned.
• For the optional PCBs, some of them are explained.
• If the system condition does not change even if the power supply is turned on with each connector removed from each
PCB, No problem occurs in this condition. is shown in the tables.
• Several errors may occur at the same time with a single connector.
• The suffix number (description of PCB) of No. 6901 ARCNET communication error. may be different from the
following explanation depending on the equipped options, cable connecting position and/or ARCNET communication
feature.
Connector No. Symptom
Power supply from TA2 to TA3 No error occurs under this condition. (The power supply to the dry heater turns to off.)
Connector No. Symptom
Power supply from TA2 to TA3 All the systems do not start.
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