Mitsubishi Heavy Industries SRK20ZJX-S Service Manual page 73

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
Mark Color
Power supply
BK Black
1 Phase
RD Red
220-240V 50Hz
WH White
OR Orange
BR Brown
TB1
YE Yellow
Y／G Yellow／Green
TB2
UNIT A
TB3
UNIT B
◆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 15A
BK BK
R
L
IN
WH WH
S
N IN
Y／G
G1
Y／G
G
Y／G
1 BK
WH
2 CNA
RD
3
BK
1
WH
CNB
2
BR
3
CNHEAT CN20S
WH RD
HEATER 20S
PWB 2（SUB）
G2
CNEEV1
Y／G
WH RD
M M
EEV EEV
A B
◆Inspection power transistor
Remove the fasten terminal and test
output voltage
BK
R
R
O
WH
S
S
O
T1
WH
S-2
S-1
T2
RD
C-1 C-2
5
CNMAIN
CNSUB
2
U
CN20V CN20V
V
W
PWB 1（MAIN）
CNFAN
CNTH CNTH
2 2 2 2
TH1 TH2 TH3
TH4
YE
R
OR
RD
WH
M
3～
BK
CM
M
FM0
◆Inspection of outdoor
fan motor
See page 109.