Mitsubishi Heavy Industries SRK60ZSX-S Technical Manual page 72

Models SRC50ZSX-S, 60ZSX-S
◆Check point of outdoor unit
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 symbol
Mark Color
BK Black
BL Blue
RD Red
WH White
YE Yellow
Y／G Yellow／Green
◆Voltage check in PCB
The normal range is as follows.
Display Voltage range
①DC280V DC230V - DC310V
②DC 20V DC 18V - DC 22V 2 2 2
③DC 13V DC 12V - DC 14V 2 2 2
④DC 15V DC 14V - DC 16V 2 2 2
⑤DC 5V DC 4V - DC 6V 22 22 22
⑥DC 2.5V DC 2.3V - DC 2.5V 2
◆Inspection power transistor
Remove the fasten terminal and test
output voltage
L1
◆Inspection of resistance valve of sensor
Remove the connector and check the resistance valve.
See the section of sensor characteristics on page 62.
Power source
1 Phase
AC200-240V 50Hz
CM
Indoor
MS
unit
3～
U V W
⑥
④
CNTH
2 2 2
L2
TH1 TH2 TH3
71
- -
◆Power source and serial signal inspection
to : AC220/230/240V
L N
to : AC220/230/240V
1 2/N
to : Normal if the voltage oscillates between
2/N 3
DC0 and approx. 20V
Outdoor unit
TERMINAL
BLOCK
TB1
FUSE
（BK）
（BK）
L
250V 20A
（WH）
N
（Y／G）
TERMINAL
BLOCK
TB2
1
2
N
（RD）
3
（Y／G）
①
②
⑤
C-2
③
S.IN
CNFAN
CNEEV
1 2 3 4 6
M
M
EEV
FMo
◆Inspection of outdoor fan motor
See page 72.
'17 • SRK-T-203
（WH）
（BK）
R.IN
CN20S
20S
◆Inspection of electronic
expansion valve
See page 72.