Check
SiBE041025
86
Service Diagnosis
5.1.2 Thermistor Resistance Check
Check No.06
Disconnect the connectors of the thermistors from the PCB, and measure the resistance of
each thermistor using tester.
The relationship between normal temperature and resistance is shown in the table and the
graph below.
For the models in which the thermistor is directly mounted on the PCB, disconnect the
connector for the PCB and measure.
Thermistor Room temperature thermistor
Other thermistors
R25°C = 10 k
Ω
R25°C = 20 k
Ω
Temperature (°C)
B = 3435
B = 3950
–20
73.4 (k
Ω
)
211.0 (k
Ω
)
–15
57.0
150.0
–10
44.7
116.5
–5
35.3
88.0
0
28.2
67.2
5
22.6
51.9
10
18.3
40.0
15
14.8
31.8
20
12.1
25.0
25
10.0
20.0
30
8.2
16.0
35
6.9
13.0
40
5.8
10.6
45
4.9
8.7
50
4.1
7.2
(11952)
Other thermistors
Room temperature thermistor
(˚C)
(˚C)
50
25
0
–15
0
15
30
45
(k
Ω
)
(k
Ω
)
–15
0
15
30
45
150
100
50
Tester
Resistance range
RTH1
Tester
(R3460)
