Troubleshooting Guide
Electrical Parts
Troubleshooting
Guide
Possible Trouble 1
The unit does not operate.
Is the
Trans input power AC 115V?
YES
Is the Trans output power
about AC 14V?
YES
Is output Voltage of IC01D
DC 12V?
YES
Is output Voltage of IC02D
DC 5V?
YES
Is the reset circuit good?
(The No.14 of Micom is 5V.)
YES
Is the connection between
AC and DC
OK?
YES
NO |
| • Check the Fuse. |
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| • Check the Fuse. |
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| • Check the wiring diagram. |
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| • Check the wiring diagram. |
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NO | Is shorted the Trans. output? | NO |
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| • Check the Main |
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| PCB pattern. |
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| YES |
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| • Replace the Trans. |
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NO |
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| • Replace D02D~D05D. |
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| • Replace IC01D. |
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NO | • Replace IC02D. |
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NO | • Replace IC01A, C02A. |
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NO |
| • Connect connector |
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Is the voltage No.18 of Micom | NO |
| • Check the PCB |
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| pattern. |
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DC 5V? |
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YES
Replace AC PCB Ass'y.
26Room Air Conditioner