Panasonic NR-B420M Service Manual page 4

B420M/MS/MW, B480M/MS/MW,
B570M/MS/MW/D/D-*9, B53D2,
B643M/MS/MW/D/D-*9, B703M/MS/MW,
C603D, C703M/MS/MW/D
Symptom 2. Poor cooling
Compressor operates
Measure temperature in freezer and
refrigerator compartments.
At center of freezer:
approx. -15 ° C
At center of refrigerator:
approx. 4 ° C
Dial settings: C/MED
Check operation of cooling fan motor.
Check frost of evaporator.
Too much frost.
Note 1: If the temperature fuse blows or defrost heater is broken, the timer will
Poor cooling at
Freezer only.
Poor cooling
at refrigerator only.
Temperature high in both
refrigerator and freezer
compartments.
Operates
Check position of timer cam.
(A) 1 st contact noise: defrosting contact (C-NO) ON.
(B) 2 nd contact noise: cooling contact (C-NC) ON.
white marked
stop with the timer contacts (C-NO) ON, thus preventing the resumption
of cooling operation.
Consequently, there will be no cooling at all of the refrigerator.
Not operates
Frost at upper only.
(A) defrosting position
(B) During cooling
operation
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Check the setting of the
COLD AIR CONTROL.
Check the setting of the
COLD AIR CONTROL.
Check door switch
continuity
Frost at bottom only.
Condition B
Condition A