'18 • SRK-SM-259
-
32
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(9) Checking the indoor electrical equipment
(a) Indoor unit PCB check procedure
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 unit
PCB.
Is the fuse burnt out? (3.15 A)
YES
YES
YES
NO
NO
NO
(b) Indoor unit fan motor check procedure
1) Indoor unit PCB output check
2) Fan motor resistance check
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
−
Defrost operation is performed for 10 minutes at approx. 35 (model SRC35:45) minutes.
Defrost operation is performed for 10 minutes at approx. 35 (model SRC35:45) minutes.
k
⑥⑤④③②①
⑥⑤④③②①
FM
i
DC15V
Indoor unit PCB
DC 308-336V
DC several V
(4-6 V)
CNU
(–)
GND
Blue
Yellow
White
Black
Red
Measuring
point
Voltage range when
normal
①
−
③
④
−
③
⑤
−
③
-
-
unit
① ④ ⑤
unit
unit
(10) How to make sure of wireless remote controller
(c) Power transistor inspection procedure
[Use a tester with a needle indicator for the inspection. (Do not use a digital tester. Check in the AC 300 volt range.)]
(1) If there is a self-diagnosis display, inspect the compressor system (burns, wiring mistakes, etc.) If no problems are
found, check the
output of the power transistor.
(2) Output inspection procedure
Disconnect the terminals for the compresseor.
If an output such as the one shown in the figure on the below can be measured, the power transistor and the circuit
board for the
outdoor unit are normal.
(Example)
RUN light : ON
TIMER light: 2 time flash
Measure in this sectionOperation switch ON
8-10 sec.
1 sec. 1 sec.
3 min. 3 min.
1 sec.
0
Output voltage
(ACV)
The figare below shows the SRK series.
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