Mitsubishi Heavy Industries SRK20ZJX-S Service Manual page 75

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 Marks
Power supply
Mark Color
1 Phase
BK Black
220-240V 50Hz
BL Blue
BR Brown
TB1
RD Red
WH White
L
OR Orange
N
BR Brown
YE Yellow
Y／G Yellow／Green
TB2
1
2
UNIT A
3
TB3
1
2
UNIT B
3
TB4
1
2
UNIT C
3
TB5
1
2
UNIT D
3
◆Power source and serial
signal inspection
① to ②: AC 220/230/240V
② to ③ : Normal if the voltage
oscillates between DC 0
and approx. 20V
FUSE
250V 20A
BK BK
R
IN
WH WH
S
IN
Y／G
G1
Y／G
G
Y／G
BK
WH
CNA
RD
Y／G
BK
WH
CNB
BR
Y／G
BK
WH
CNC
BL
Y／G
BK
WH
CND
YE
Y／G
CNHEAT CN20S G2
Y／G
Y／G
WH
WH RD
20S
HEATER
CNMAIN
PWB 2（SUB）
CNEEV1 CNEEV2 CNTH
RD BL GN
M M M M
EEV EEV EEV EEV TH4
A B C D
◆Inspection power transistor
Remove the fasten terminal and test
output voltage
BK
R
R
O
WH
S
S
O
T1
WH
S-1 S-2
T2
RD
C-2
C-1
5
CNSUB
2
U
CN20V CN20V
V
W
PWB 1（MAIN）
CNFAN
CNTH
2 2 2 2
◆Inspection of outdoor
TH1 TH2 TH3
YE
R
OR
RD
WH M
3～
BK
CM
M
FMo
fan motor
See page 109.