◆
Inspection power transistor
Remove the fasten terminal and test
output voltage
◆
Inspection of outdoor fan motor
See page 223.
◆
Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page 214.
FMo
RD
CNTH
CNFAN
M
2
2
2
t
゜
t
゜
2
t
゜
t
゜
TH1 TH2 TH3 TH4
T2
T1
L
OR
YE
T12
T11
L
OR
YE
20S
CN20S
BK
WH
RD
V W
U
CM
M
3
～
CNSUB
S-2
C-2
CNTH
CNFAN
②
①
⑤
Models SCM71ZM-S1,80ZM-S1
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.
◆
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
UNIT A
UNIT B
UNIT C
UNIT D
Power source
1 Phase
AC220-240V 50Hz
220V 60Hz
◆
Inspection of electronic
expansion valve
See page 223.
Color marks
Mark
Color
BK
BR
Black
BL
Blue
BR
Brown
Brown
RD
Y
／
G
Red
Yellow
／
Green
WH
White
OR
Orange
YE
Yellow
EEV A
BK
WH
WH
S-1
CNMAIN
S
IN
R
IN
BK
WH
S
O
R
O
250V 20A
FUSE
G2
Y
／
G
RD
C-1
CN20V
5
2
G1
Y
／
G
CNEEV1
CNEEV2
TB2
CNA
CNB
CNC
CND
TB1
N
L
EEV B
EEV C
EEV D
TB3
TB4
TB5
3
2
1
3
2
1
3
2
1
3
2
1
Y
／
G
WH
BK
BK
WH
RD
Y
／
G
BK
WH
BL
Y
／
G
BK
WH
YE
Y
／
G
BK
WH
BR
Y
／
G
M
M
M
M
Y
／
G
WH
RD
BL
GN
PCB 2
（
SUB
）
PCB 1
（
MAIN
）
Display
Voltage range
◆
Voltage check in PCB
The normal range is as follows.
①
DC280V DC230V
-
DC310V
②
DC
2
20V DC
2
18V
-
DC
2
22V
③
DC
2
13V DC
2
12V
-
DC
2
14V
④
DC
2
15V DC
2
14V
-
DC
2
16V
⑤
DC
22
5V DC
22
4V
-
DC
22
6V
⑥
DC 2.5V DC 2.3V
-
DC
2
2.5V
WH
HEATER
CNHEAT
R
S
③
⑥
④
(12) Outdoor unit inspection points
-
222
-
'17 • SCM-T-225
