Mitsubishi Heavy Industries SRK20ZJX-S Service Manual page 61

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
BK Black
Power supply
BL Blue
1 Phase
RD Red
220-240V 50Hz
WH White
OR Orange
TB1
BR Brown
YE Yellow
Y G Yellow Green
TB2
UNIT A
UNIT B
UNIT C
Power source and serial
signal inspection
to : AC 220/230/240V
to : Normal if the voltage
oscillates between DC 0
and approx. 20V
FUSE
250V 15A
250V 20A
BK BK
R
L IN
WH WH
S
N IN
Y G
G1
Y G
G
Y G
BK
1
WH
2 CNA
RD
3
BK
1
WH
2 CNB
BR
3
BK
1
WH
2
CNC
BL
3
CNHEAT CN20S G2
Y G
WH RD
HEATER 20S
CNMAIN
PWB 2 SUB
CNEEV1 CNEEV3 CNTH
2
WH RD BL
M M M
TH4
EEV EEV EEV
A B
C
Inspection of resistance value of sensor
Inspection of electronic
Remove the connector and check the resistance value.
expansion valve
See the section of sensor characteristics on page 52.
See page 62.
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-1 C-2
5
CNSUB
2
U
CN20V CN20V
V
W
PWB 1 MAIN
CNFAN
CNTH
2 2 2
TH1 TH2 TH3
YE
R
OR
RD
WH
M
3
BK
CM
M
FMo
Inspection of outdoor
fan motor
See page 62.