Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 171

(8) Outdoor unit control failure diagnosis circuit diagram
Models SRC40ZSX-S, 50ZSX-S, 60ZSX-S
● Outdoor unit check points
CAUTION- HIGH VOLTAGE
High voltage is produced in the control box. Don't touch
electrical parts in the control box for 5 minutes after the
unit is stopped.
Color symbol
Mark Color
BK Black
BL Blue
RD Red
WH White
YE Yellow
Y／G Yellow／Green
◆Inspection power transistor.
Remove the faston terminal and test
output voltage.
L1
◆Inspection of resistance value of sensor.
Remove the connector and check the resistance value.
◆Voltage check in PCB.
The normal range is as follows.
Display Voltage range
①DC280V DC230V - DC310V
②DC220V DC218V - DC222V
③DC213V DC212V - DC214V
④DC215V DC214V - DC216V
⑤DC225V DC224V - DC226V
⑥DC 2.5V DC 2.3V - DC22.5V
Power source
1 Phase
AC200-240V 50Hz
CM
MS
3～
Indoor
unit
U V W
⑥
④
CNTH
2 2 2
L2
TH1 TH2 TH3
170
-
◆Power source and serial signal inspection.
to : AC 220/230/240V
L N
to : AC 220/230/240V
1 2/N
to : Normal if the voltage oscillates between
2/N 3
DC 0 and approx. 20V
Outdoor unit
TERMINAL
BLOCK
TB1
FUSE
（BK）
（BK）
L
250V 20A
（WH）
N
（Y／G）
TERMINAL
BLOCK
TB2
1
2
N
（RD）
3
（Y／G）
①
②
⑤
C-2
③
S.IN
CNFAN
CNEEV
1 2 3 4 6
M
M
EEV
FMo
◆Inspection of outdoor fan motor.
(Refer to page 231)
-
'19 • PAC-T-327
（WH）
（BK）
R.IN
20S
◆Inspection of electronic
expansion value.