<Reference>
If power module is defected, self diagnosis lamps on the MAIN P.W.B. may indicate as shown below:
Fig. 3-5
Fig. 3-4 Power module circuit (U
+
is OFF, V
–
is ON)
––
Since current flows at point B only when U
+
transistor and V
–
transistor is ON, the current
––
waveform at
point B
point B becomes intermittent waveform as shown in Fig.3-3. Since current at point B is approximately
proportional to the input current of the air conditioner, input current is controlled by using DC current (Id)
yy
Table 3-1
Ip (peak current cut)
LD301 Blinks 2
times
Blinks 3
times
Blinks 4
times
LD301
LD301
Self-diagnosis
Self-diagnosis lamp
and mode
Abnormal low speed
rotation
Switching incomplete
LD303
LD302
LD301
MAIN P.W.B.
SERVICE SWITCH
HIC
IPM
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