Mitsubishi Heavy Industries SRC25ZMP-S Technical Manual page 59

◆ 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
OR Orange
RD Red
WH White
Y Yellow
Y／G Yellow／Green
POWER
AC220ｰ240V 50Hz
L
N
◆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
L
Outdoor unit
T1 T2
250V 15A
R.IN
（BK）
1
NOISE
2
FILTER
S.IN
（WH）
3
（Y／G）
C-2
（RD）
TB
G1
（Y／G）
CN20S
t゜
20S
TH1 TH2 TH3
◆Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page 51.
t゜
PAM
F4
CIRCUIT
250V 10A
SWITCHING POWER
CIRCUIT
CNTH CNEEV
t゜ t゜
M
EEV
◆Inspection of electronic expansion valve
See page 59.
◆Inspection power transistor
Remove the fasten terminal and test output voltage
PWB ASSY
POWER
TRANSISTOR
F2
U
P （RD）
U
250V 20A
M
V
（WH）
V
3～
W （BK）
W
N CM
F3 250V 1A
M
CNFAN
FMo
◆Inspection of outdoor fan motor
See page 59.