Hitachi RAS-25WX8 Manuel De Maintenance page 103

Since current flows at point
intermittent waveform as shown in Fig. 4-3. Since current at point
the input current of the air conditioner, input current is controlled by using DC current (Id) detection
resistor.
<Reference>
If power module is defected, self diagnosis lamps on the MAIN P.W.B. may indicate as shown below:
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Fig. 4-4 Power module circuit (U
B only when U
Fig. 4-5
manuals search engine
+
is OFF, V
+
transistor is ON, the current waveform at point
B
Table 4-1
Self-diagnosis
Ip (peak current cut)
Abnormal low speed
rotation
Switching incomplete
– 102 –
–
is ON)
B becomes
is approximately proportional to
Self-diagnosis lamp
and mode
Blinks 2
LD301
times
Blinks 3
LD301
times
Blinks 4
LD301
times