-
217
-
'16 • SCM-T-199
◆Inspection power transistor
Remove the fasten terminal and test
output voltage
◆Inspection of outdoor
fan motor
See page 219.
◆Inspection of resistance value of sensor
Remove the connector and check the resistance value.
See the section of sensor characteristics on page
209.
BK
WH
RD
V WU
FMo
CM
CNTH
CN20S
CNFAN
M
3～
M
2 2 2
t゜
t゜
t゜
Tho-R
2
t゜
Tho-STho-A Tho-D
S1 R1
SNSUB
S-2
C-2
②
①
③
T1
L1
（Y）
T2（Y）
T11
L2
（BL）
T12（BL）
20S
CNHEAT
HEATER
(12) Outdoor unit inspection points
Models SCM40ZS-S,45ZS-S
Color marks
Mark Color
BK
BR
Black
Brown
RD
Y／G
Red
Yellow／Green
WH White
BL Blue
EEV A
BK
WH
WH
S-1
CNMAIN
S
IN
R
IN
BK
WH
S
O
R
O
250V 15A
FUSE
RD
C-1
CN20V
3
2
G1
Y/G
G2
Y/G
CNEEV1
CNA
CNB
TB1
N
L
EEV B
Y/G
WH
BK
UNIT A
UNIT B
M
M
Power source
1 Phase
AC220-240V 50Hz
WH
RD
PCB 2（SUB）
PCB 1（MAIN）
RD
RD
3
2
1
3
2
1
BK
WH
BR BR
TB2
YE Yellow
Display Voltage range
◆Voltage check in PCB
The normal range is as follows.
①DC280V DC230V - DC310V
②DC220V DC218V - DC222V
③DC213V DC212V - DC214V
④DC215V DC214V - DC216V
⑤DC225V DC224V - DC226V
⑥DC 2.5V DC 2.3V - DC
2
2.5V
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: AC220/230/240V
② to ③ : Normal if the voltage oscillates between
DC0 and approx. 20V
◆Inspection of electronic expansion valve
See page 219.
④
⑥
⑤
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