Measurements And Adjustments - Panasonic NE-C1275 Service Manual

NE-C1275 / NE-C1475
8.6. Protector diode
1. Isolate the protector diode assembly from the circuit by
disconnecting its leads.
2. With the ohmmeter set on the highest resistance scale,
measure the resistance across the protector diode
terminals.
Reverse the meter leads and again observe the resistance
reading.
A normal protector diode's resistance will be infinite in both
directions.
It is faulty if it shows continuity in one or both directions.

9 MEASUREMENTS AND ADJUSTMENTS

9.1. Adjustment of Primary latch
switch, Secondary latch
switch and short switch
1. When mounting Primary latch switch, Secondary latch
switch and short switch to door hook assembly, mount the
Primary latch switch, the Secondary latch switch and the
short switch to the door hook assembly as shown in Figure.
2. When mounting the door hook assembly to the oven
assembly, adjust the door hook assembly by moving it in
the direction of arrow in Figure so that the oven door will not
have any play in it. Check for play in the door by pulling the
door assembly. Make sure that the latch keys move
smoothly after adjustment is completed. Completely tighten
the screws holding the door hook assembly to the oven
assembly.
9.2. Measurement of microwave
output
The output power of the magnetron can be determined by
performing IEC standard test procedures. However, it is
possible to test the magnetron by following procedure outlined
below.
Necessary equipment:
1 litre beaker
Glass thermometer
Wrist watch or stopwatch
NOTE:
Check the line voltage under load to ensure it meets
specifications. Low voltage condition will cause a
reduction in magnetron output. Temperature readings and
8.7. To test the oven temp sensor
thermistor
This sensor monitors the heat produced by the heater circuit
and maintains the oven temperature the user has selected.
Normal room temperature, especially in a kitchen can vary
anywhere from 10°C to 32°C. The reading across the oven
sensor thermistor should be within 100K ohm to 500K ohm
when reading in an area within the 10°C to 32°C room
temperature range.
If the resistance reading is out of the range stated here, the
sensor is defective and must be replaced with sensor unit.
NOTE 1:
When measuring resistance
connector (CN4) from the DPC otherwise a false reading
may be indicated.
NOTE 2:
If checking an oven sensor thermistor just after the
microwave oven has been operating, the sensor of course
won't be room temperature. In this case the sensor must
be removed and allowed to cool down to the 50°F/10°C to
90°F/32°C range.
heating time, should be as accurate as possible.
Output power performance test procedure.
1. Fill the beaker with exactly one litre of tap water.
Stir the water using the thermometer and note the
temperature. (Record as T1)
2. Place the beaker in the center of cook plate.
Set the oven for High power and heat for exactly one
minute.
3. After completion of the heating cycle, stir the water again
with the thermometer and note the temperature. (Record as
T2).
The normal temperature rise (T2-T1), for these models should
be more than following chart indicated using the High power
selection with the oven operating at the specified line voltage.
20
disconnect the 4-pin