Panasonic NR-B420M - Page 5

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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
Check if the timer motor is
properly running through the
"VIEW WINDOW" located at
the side of timer body. You can
see the gear moving.
Continuity
Continuity
Check fan motor
continuity.
Moving.
Manually set timer to
condition A. and confirm
that defrost heater heats up.
No contiunity
Not movimg.
Heats up.
VIEW WINDOW
(to check gear moving)
Short circuit orange (2) and brown (1)
terminals of timer (both ends of
bimetal will be short circuited), and
confirm that defrosting heater heats up.
Does not heat up.
Heats up.
Does not
heats up.
Tu rn the COLD AIR CONTROL
to D or E.
Tu rn the COLD AIR CONTROL
to A or B.
Replace door switch
Replace fan motor
(broken coil).
Repair cooling unit
(initial gas leakage).

Replace bimetal
thermostat (broken).

Excessive door gap.

Door open for long
period.
Replace timer
(broken coil).
Replace timer
(faulty operationl).
Replace bimetal thermostat
(does not switch ON).
Replace timer (no continuity
between defrosting contacts).
Rotating
direction
Cam shaft