Mitsubishi Electric MUZ-AY25VG Service Manual page 57

12-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
MUZ-AY25VG MUZ-AY35VG
MUZ-AY25VGH MUZ-AY35VGH MUZ-AY42VGH MUZ-AY50VGH
Back side of unit
230 V AC
Fuse (F62)
15 A 250 V
Output to drive
compressor
(LDU, LDV,
LDW)
Fuse (F901)
T3.15AL250V
Output to
drive outdoor
fan motor
(CN932)
Front side of unit
Defrost thermistor(RT61)
Ambient temperature thermistor(RT65)
Outdoor heat exchanger temperature thermistor(RT68)
100
90
80
70
60
50
40
30
20
10
0
-20 -10 0 10 20
Temperature( )
OBH931
MUZ-AY42VG
Smoothing
capacitor
DB61
260 - 370 V DC
(C61)
(-) (+)
Fuse (F801)
T3.15AL250V
Fin temperature
thermistor/RT64
(CN642)
Signal of outdoor
fan motor (CN931)
Ambient temperature
thermistor/RT65
(CN643)
Discharge temperature thermistor (RT62)
800
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100 110 120
30 40
Temperature (°C)
MUZ-AY50VG
Smoothing Smoothing
capacitor capacitor
(C62) (C63)
LED
LEV (CN724)
Discharge temperature
thermistor/RT62 (CN641)
Defrost thermistor/
RT61 (CN641)
Outdoor heat exchanger
temperature thermistor/
RT68 (CN644)
Fin temperature thermistor(RT64)
200
180
160
140
120
100
80
60
40
20
0
0
57
R.V.coil/21S4
Defrost heater
(CN721) (CN722)
230 V AC
(MUZ-AY•VGH)
Fuse (F701)
T3.15AL250V
Fuse (F61)
25 A 250 V
Jumper wire for
changing defrost
setting (JS)
Jumper wire for
pre-heat control
setting (JK)
10 20 30 40 50 60 70 80
Temperature( )
230 V AC