LG TD-C70070E Service Manual page 26

DIAGOSTIC TEST
10
Test 6 Thermister check
Trouble Symptom : Poor drying performance(over-drying or no drying). Abnormal
Measurement condition : Power cord is unplugged.
RD4
4 3
2 1
Dryer
Temperature
10°C↓
20~30°C
30~40°C
thermistor operation.
WH8
With RED 4 , WHITE 8 disconnected from
Controller, check
1) High temperature thermistor ( Wire color :
Blue ) White 8 pin ③ - White 8 pin ④
resistance ranges table data according to
1 2 3 4
surrounding temperature.
5 6 7 8
2) Low temperature thermistor ( Wire color :
Blue ) Red 4 pin ② - Red 4 pin ④
resistance ranges table data according to
surrounding temperature.
• When measuring resitance of
Heater thermistor.
It range table data.
• When measuring resitance of
Low temperature thermistor.
It range table data.
• Check Harness
Resistance
TH-Heater TH-Drum
19~111kΩ
250~180kΩ 11~8kΩ
180~113kΩ 8~5kΩ
YES
YES
Resistance
Dryer
Temperature
TH1
40~50°C 113~75kΩ
50~60°C 75~50kΩ
60°C↑ 50kΩ↓
25
• Check and replace
Controller.
1) Check disconnected
Housing or severed
Wire.
ABNORMAL
2) Check the
resistance of
thermistor.
3) Replace controller
and then recheck,
if anything else
occurs.
• Replace the thermistor
⇨
of heater.
NO
⇨
• Replace the low
NO
temperature thermistor.
Remark
TH2
5~4kΩ
4~2.5kΩ
2.5kΩ↓