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| FILE NO. | ||
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| Diagnosis/Process flowchart |
| Item |
| Contents |
| Summary | ||||||||||||||||||||||
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| A |
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| C |
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| Check | Check winding resistance |
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| between phases of |
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| compressor, and resistance |
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| between outdoor frames by |
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| Check |
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| using a tester. | → | OK if 10MΩ | or more → | ||||
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| • | Is not grounded. | ||||||||
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| winding of |
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| compressor. |
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| • | Is not | } | OK if 0.51Ω | → 0.57Ω | ||||||||
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| between windings. | (Check by a digital tester.) | ||||
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| OK |
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| • | ||||||
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| Winding is not opened. |
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| Check |
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| Replace |
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| NG | fan motor |
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| com- |
| Operation | Remove connector CN300 of |
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| position |
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| pressor. |
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| the outdoor fan motor, turn on |
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| detect |
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| signal. |
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| the power breaker, and |
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| OK |
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| perform the operation. (Stops |
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| though activation is |
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| Replace |
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| prompted.) |
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| outdoor |
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| Check operation within 2 |
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| fan |
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| minutes 20 seconds after |
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| motor. |
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| activation stopped. |
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| <Output check of fan motor | a) One or two of three | |||
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| Replace control |
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| position detect signal> |
| voltages should be 5 V, | |||||||||||
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| board assembly. |
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| While connecting connector |
| and others should be 0V. | |||||||||||
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| 5P (CN301) for position |
| (When all are 0V or 5 V, | ||
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| Check |
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| detection, using a tester, |
| it is not accepted.) | |||||
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| NG |
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| measure voltage between | b) When rotating the fan | |||||||
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| winding |
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| slowly with hands, the | |||||||
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| resistance. |
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| voltage between pins | ||||||
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| OK |
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| should move from 0V to 5 V. | |||
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| (Check it with an analog | |
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| Replace |
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| Replace |
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| tester.) |
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| control board. |
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| compressor. |
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11-8. How to Check Simply the Main Parts
1)When removing the front panel or the P.C. board, be sure to shut off the power supply breaker.
2)When removing the P.C. board, hold the edge of the P.C. board and do not apply force to the parts.
3)When connecting or disconnecting the connec- tors on the P.C. board, hold the whole housing. Do not pull at the lead wire.
1)When a P.C. board is judged to be defective, check for disconnection, burning, or discolora- tion of the copper foil pattern or this P.C. board.
2)The P.C. board consists of the following 2 parts
a.Main P.C. board part:DC power supply circuit (5 V, 12 V, 15 V), Indoor fan motor control circuit, CPU and peripheral circuits, buzzer, and Driving circuit of louver.
b.Indication unit of infrared ray receiving Infrared ray receiving circuit, LED:
To check defect of the P.C. board, follow the procedure described below.
– 73 –