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Checking procedure for main parts
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
In case that Mg. SW 52C (CMC1) is not ON, the compressor current will travel through these resistances, and they will be
broken. Mg. SW 52C (CMC1) should be checked. Check the resistance between the primary and secondary terminal where
the contact point is melted for Mg. SW 42C. If there is continuity, the contact is melted and 52C is broken (NG).
Reactor resistance can be messured between TB3 and RB = 0,2Ω. Checking this component is not necessary.
note
Noise filter does not affect ISPM directly, so is not necessary to check it when ISPM fails.
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Both digital or analog testers are valid to check the values.
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7.4.4. fault diagnosis of dC fan motor.
About DC fan motor fault diagnosis:
When ISPM/DIP-IPM is faulty and Alarm 53 appears, the fan motor may also be damaged. To prevent ISPM/DIP-IPM
damage which may result from operation combined with a faulty fan motor, check also if the fan motor is not damaged when
ISPM/DIP-IPM is replaced
note
Turn OFF main power before start working.
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Working and checking with the power ON may disturb correct diagnosis and may result in failure.
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DC motor(s) included in different models:
Model
Pieces
RHUE-3AVHN
2
RHUE-4AVHN
2
RHUE-5AVHN
2
RHUE-5AHN
2
RHUE-6AVHN
2
RHUE-6AHN
2
● fault diagnosis procedure
1. Remove fan motor connectors from the control PCB ISPM or DIP-IPM and turn the fan motor shaft by hand.
normal
fan motor shaft turns smoothly
Faulty:
No continuous rotary torque movement felt when turning the motor
by hand. This occurs because the internal magnet of the fan motor
breaks the movement when the internal electronic circuit of the fan
motor has a short-circuit fault
2. Measure the fan motor resistance using a tester.
