Samsung DVM S ECO BIG Series Service Manual page 71

■ Error due to operation failure of Fan2 (E-346) / Error due to operation failure of Fan1 (E-446)
(cont.)
Outdoor unit Display
Judgement Method
Cause of problem
1. Preparations before checking
1) Power Off
2) IPM failure, discharge mode may not work properly. Therefore, wait more than 15 minutes after the Power Off.
3) Remove all of the Fan PCB connectors. (Comp connector included)
4) Prepare the digital multi tester.
2. Inspection Method
1) Refer to Figure1 and Table1, respectively the resistance value and diode voltage value measure.
2) According to the criterion in Table 1 to determine whether the failure of IPM.
Division
Measure
the resistance values
Measure the diode
voltage values
Samsung Electronics
• Startup, and then if the speed increase is not normally.
• Detected by H/W or S/W.
• Compressor connection error.
• Defective Compressor.
• Defective PCB.
Measured point
+
40
40
40
U
V
W
U
V
W
34
34
34
E-346 / E-446
Criterion
-
U
V
W
More than 3 MΩ
34
34
34
40
40
40
0.3 ~ 0.7V
U
V
W
Troubleshooting
Remark
Measurement error
can occur for reasons
such as the initial mea-
surement condenser
discharge.
Measured over at least
three times.
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