Mitsubishi Electric MR-C375C-W-A Service Manual page 15

Components/
Part Name
Measure the resistance with a tester.(Ambient temperature:Room temperature 15
Black
Black
Water pipe
heater
Operation method
Defrost
Heater
Measure the resistance with a tester according to the following graph.
(Thermistor resistance values against temperature)
Resistance measured under the ambient temperature from -50
1. 200 Ω to 500kΩ ............normal
2. Out of the above range ............abnormal
(kΩ)
Thermistor resistance valves against
temperature
35
30
25
20
15
Thermistor
10
5
0
-20
Trouble shooting with self-check
(1) If the self - check indicates the abnormality of thermistor right after the power is
turned on, measure the resistance of the thermistor.
If the circuit of thermistor is short , check the element of the thermistor and the
contact of the connector.
(2) When the self - check indicates the abnormality of thermistor a few seconds
after the power is turned on , check the contact of the connector.
Check Method and Criterion
The heater is turned on when the temperature of tray
for automatic ice making tray is about 10
Rated input
operation method
Measure the resistance with a tester.
(Ambient temperature:Room temperature 15
372
Outside air thermistor
Refrigerator
compartment,
Freezer
compartment,
,Defrosting,
Ice making
Inner
thermistor
-10 0 10
20
Temperature
Normal
1.3 kΩ (Approx.)
155 W
Power ON after defrosting
(14 + 1.5
Normal Abnormal (faulty)
(Approx.) Opened ( ∞ Ω )
Ω
Thermistor Check Procedure
Thermistor resistance will vary
with the change of temperature.
Take the temperature around the
thermistor, and then measure
thermistor resistance using a
tester.
The relation between resistance
and temperature is as shown on
the left side.
30
13
Parts Mounted
o o
C ~ 25 C)
At the left
bottom of
vegetable
Abnormal (faulty)
compartment
Open (∞ Ω )
o
C or less
In the drip tray
under the
evaporator of the
o
C or more)
freezer
compartment
o o
C ~ 25 C)
(Defrost thermistor)
Evaporator
o o
C to +50 C
(Freezer
compartment
thermistor and Ice
making tray
thermistor) In Ice
maker of freezer
compartment
(Refrigerator
compartment
thermistor) In the
control panel of
refrigerator
compartment
(Outside air
thermistor) In the
buzzer board (check
board)
Position