Outdoor Unit Inspection Points - Mitsubishi SCM40ZS-S Technical Manual

(12) Outdoor unit inspection points
Models SCM40ZS-S,45ZS-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 1
WH
N 2
RD
3
UNIT A Y/G
TB2
BK
1
WH
UNIT B
2
BR
3
◆Voltage check in PCB
The normal range is as follows.
Display
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）
U V W
M
CM
3～
◆Inspection power transistor
Remove the fasten terminal and test
output voltage
◆Power source and serial signal inspection
① to ②: AC220/230/240V
② to ③ : Normal if the voltage oscillates between
FUSE
250V 15A
BK
R
IN
WH
S
IN
G1
Y/G
G2
Y/G
RD
CNA
BR
CNB
Voltage range
L1 L2
DC0 and approx. 20V
CNMAIN
CN20V
PCB 2（SUB）
CNEEV1
WH RD
M M
EEV A EEV B
◆Inspection of electronic expansion valve
See page 219.
①
②
SNSUB
⑥
⑤
④
CNFAN
CNTH
2
M
FMo
Tho-R Tho-A Tho-D
◆Inspection of outdoor
◆Inspection of resistance value of sensor
fan motor
Remove the connector and check the resistance value.
See page 219.
See the section of sensor characteristics on page 209.
217
- -
'16 • SCM-T-199
Color marks
Mark Color
BK Black
RD Red
WH White
BL Blue
BR Brown
YE Yellow
Y／G Yellow／Green
BK
R
O
WH
S
O
WH
S-1
RD
C-1
3
2
S1 R1
C-2
S-2
③
CN20S CNHEAT
2 2 2
20S HEATER
Tho-S