Mitsubishi SCM40ZS-S Technical Manual page 219

Model SCM50ZS-S
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.
Power source
1 Phase
AC220-240V 50Hz
TB1
BK
L
WH
N
Y/G
TB2
BK
1
WH
UNIT A
2
RD
3
BK
1
WH
UNIT B
2
BR
3
BK
1
WH
UNIT C
2
BL
3
◆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
PCB 1（MAIN）
④
◆Inspection power transistor
Remove the fasten terminal and test
output voltage
FUSE
250V 15A/
250V 20A
BK
R
IN
WH
S
IN
G1
Y/G
G
Y/G
CNA
CNB
CNC
CNHEAT CN20S
WH RD
HEATER 20S
◆Inspection of electronic expansion valve
See page 219.
L
U V W
M
CM
3～
-
◆Power source and serial signal inspection
① to ②: AC220/230/240V
② to ③ : Normal if the voltage oscillates between
DC0 and approx. 20V
PCB 2（SUB）
G2 CNEEV1 CNEEV3
Y/G
WH RD BL
M M
EEV A EEV B
◆Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page
⑥
CNTH
2 2 2
FMo
Tho-R Tho-A Tho-D
◆Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page 209.
218
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'16 • SCM-T-199
Color marks
Mark
BK
BL
RD
WH
OR
BR
YE
Y／G
BK
R
O
WH
S
O
WH
S-1
RD
C-1
5
CNMAIN
2
CN20V
CNTH
2
M
EEV C
Tho-S
XX .
①
S-2
②
C-2
CN20V
S
③
SNSUB
⑤
R
CNFAN
◆Inspection of outdoor fan motor
See page 219.
M
Color
Black
Blue
Red
White
Orange
Brown
Yellow
Yellow／Green