Mitsubishi Electric MUZ-FT25VGHZ-E1 Service Manual page 48

12-6. TEST POINT DIAGRAM AND VOLTAGE
1. Inverter P.C. board
MUZ-FT25VGHZ MUZ-FT35VGHZ MUZ-FT50VGHZ
Back side of unit
230 V AC
Fuse (F62)
15 A 250V
Output to drive
compressor
(LDU, LDV, LDW)
Fin temperature
thermistor/RT64
(CN642)
Fuse (F901)
T3.15AL250V
Front side of unit
Signal of outdoor
fan motor
(CN931, CN932)
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
Temperature( )
OBH865
Smoothing
capacitor
(C61)
DB61
260 - 370 V DC
(-) (+)
Ambient
Outdoor heat
temperature
exchanger
thermistor/RT65
temperature
(CN643)
thermistor
/RT68 (CN644)
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
20 30 40
Smoothing Smoothing
capacitor capacitor
(C62) (C63)
LED Fuse (F701)
Fuse (F801)
T3.15AL250V
T3.15AL250V
LEV (CN724)
Discharge temperature
thermistor/RT62(CN641)
Defrost thermistor
/RT61(CN641)
Temperature (°C)
48
R.V.coil Defrost
(CN721) heater
230 V AC (CN722)
Jumper wire
Jumper wire
for changing
for pre-heat
defrost setting
control setting
(JS)
(JK)
Fin temperature thermistor(RT64)
200
180
160
140
120
100
80
60
40
20
0
0 10 20 30 40 50 60 70 80
Temperature( )
Fuse (F61)
25 A 250 V