Sharp AE-X2M14LR Service Manual page 21

To measure the resistance, first remove the connector from the board.
Thermistor
Compressor thermistor
Heat exchanger pipe thermistor
Outdoor temp. thermistor
Suction thermistor
Thermistor unit A (suction)
Thermistor unit B (suction)
2. How to distinguish the defective parts
1. When all rooms are not cooled
The cooling cycle is abnormal.
Check the pressure.
No. Connector
TH1 CN8A
TH2 CN8A
TH3 CN8A
TH4 CN8A
TH6 CN8C
TH7 CN8C
Figure 3 Temperature properties of heatsink thermistor
500
Thermistor
Heatsink
400
To measure the resistance, first remove
the connector as shown at right.
300
200
100
0
-20 0 20
Temperature (ºC)
Are the timer lamps of the in-
door units in all rooms flashing ?
No
Press the OPERATION button
to start operating the air-condi-
tioner. (One-room operation ON)
(Set the cooling mode to 18ºC)
Yes
Is the compressor of the outdoor
unit operating ?
No
Are the timer lamps of the indoor
units in all rooms flashing ?
No
Check that the power between
the terminal board " N " and " 1 "
of the indoor unit is AC 230V,
50Hz.
Repair the wiring between the
units.
Color Connector pin
Red No. 1 to 2
Orange No. 3 to 4
Green No. 5 to 6
Black No. 7 to 8
Blue No. 1 to 2
White No. 3 to 4
Color
Signal
Black
CN8B
Heatsink thermistor
TH5 (black)
25ºC resistance 50k
6.14k
12.3k
40 60 80 100
Yes
Yes
Check the failure symptom with
the failure diagnosis mode.
3 – 6
1
3
Tester
3.25k
(Check the failure with
the outdoor unit.)
A
TO