Mitsubishi SCM125ZJ-S1 User Manual

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69
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'11 • SCM-SM-110
(9) Checking the indoor electrical equipment
(a) Indoor PCB check procedure
(b) Outdoor unit
Is there voltage between terminal
blocks
①
and
②
? (AC 220/230/240
V)
Indoor electrical components
are normal.
Is the voltage between terminal
blocks
②
and
③
oscillating between
DC 0 and 20V?
Inspect power source
for outdoor unit.
Replace fuse.
Replace indoor PCB.
Is the fuse burnt out? (3.15 A)
YES
YES
YES
NO
NO
NO
(b) Indoor unit fan motor check procedure
1) Indoor PCB output check
① ④ ⑤
2) Fan motor resistance check
⑥ ⑤ ④ ③ ② ①
⑥ ⑤ ④ ③ ② ①
FM I
DC15V
Indoor PCB
DC 280V
DC several V
(4 – 6 V)
CNU
(–)
GND
Blue Yellow White Black Red
Sensor
Operation
mode
Phenomenon
Shortcircuit Disconnected wire
Heat exchanger
sensor
Cooling
Heating
Ourdoor air
temperature sensor
Cooling
Heating
Discharge pipe
sensor
All modes
Measuring point Resistance when normal
① 
−
 ③
−
④ 
−
 ③
−
Measuring
point
Resistance when
normal
① 
−
 ③


④ 
−
 ③
⑤ 
−
 ③
⑥ 
−
 ③
Defrosting is performed for 10 minutes at approx. 40 minutes.
Defrosting is performed for 10 minutes at approx. 40 minutes.
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Mitsubishi SCM125ZJ-S1 Specifications

General

Brand	Mitsubishi
Model	SCM125ZJ-S1
Category	Air Conditioner
Language	English