Panasonic NE-1027ZPE / NE-1037ZPE Service Manual ▷ View online
3 SCHEMATIC DIAGRAM
3.1. NE-1027
9
NE-1027 / NE-1037
3.2. NE-1037
10
NE-1027 / NE-1037
4.1. Variable power cooking
control (NE-1027)
The vari-power controller controls the ON-OFF time of the vari-
power switch to vary the output power of the microwave oven
from "100" to "1000". The vari-power controller is a part of the
timer assembly. The timer assembly consists of timer motor,
timer switch, vari-power switch and the combination of gears,
cam and actuater lever.
One complete cycle of the vari-power controller is 26 seconds,
in which the vari-power switch is turned "on" or "off" by the cam
rotation is the 26 ± 2 second period.
By controlling the timing of the vari-power switch "on" period,
the power AC supplied to the high voltage transformer is
interrupted intermittently so that the average output power of
the microwave oven is varied.
Table shows the timing chart of vari-power switch operation in
respect to the power setting on the control panel.
NOTE:
power switch to vary the output power of the microwave oven
from "100" to "1000". The vari-power controller is a part of the
timer assembly. The timer assembly consists of timer motor,
timer switch, vari-power switch and the combination of gears,
cam and actuater lever.
One complete cycle of the vari-power controller is 26 seconds,
in which the vari-power switch is turned "on" or "off" by the cam
rotation is the 26 ± 2 second period.
By controlling the timing of the vari-power switch "on" period,
the power AC supplied to the high voltage transformer is
interrupted intermittently so that the average output power of
the microwave oven is varied.
Table shows the timing chart of vari-power switch operation in
respect to the power setting on the control panel.
NOTE:
The ON/OFF time ratio does not correspond with the
percentage of microwave power since approximately 2
seconds are required for heating of magnetron
filament.
percentage of microwave power since approximately 2
seconds are required for heating of magnetron
filament.
OUTPUT
ON-OFF TIME OF
POWER SETTING
POWER(W)
VARI-POWER SWITCH
(Mechanical timer model)
APPROX.
ON(SEC)
OFF(SEC)
950
950
26
0
500
500
12.7
13.3
DEFROST
340
8.5
17.5
100
100
4.5
21.5
4.2. Variable power cooking
control (NE-1037)
The coil of power relay B (RY1) is energized intermittently by
the digital programmer circuit, when the oven is set at any
power selection except for High power position. The digital
programmer circuit controls the ON-OFF time of power relay B
(RY1) contacts in order to vary the output power of the
microwave oven from "Low" to "High" power. One complete ON
and OFF cycle of power relay B is 22 seconds. The relation
between indications on the control panel and the output of the
microwave oven is as shown in table.
NOTE:
the digital programmer circuit, when the oven is set at any
power selection except for High power position. The digital
programmer circuit controls the ON-OFF time of power relay B
(RY1) contacts in order to vary the output power of the
microwave oven from "Low" to "High" power. One complete ON
and OFF cycle of power relay B is 22 seconds. The relation
between indications on the control panel and the output of the
microwave oven is as shown in table.
NOTE:
The ON/OFF time ratio does not correspond with the
percentage of microwave power since approximately 2
seconds are required for heating of magnetron
filament.
percentage of microwave power since approximately 2
seconds are required for heating of magnetron
filament.
*OUTPUT
ON-OFF TIME OF
POWER SETTING
POWER(W)
POWER RELAY B (RY1)
APPROX.
ON(SEC)
OFF(SEC)
HIGH
950
22
0
MEDIUM
500
11
11
DEFROST
340
8
14
4 DESCRIPTION OF OPERATING SEQUENCE
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NE-1027 / NE-1037
Unlike many other appliances, the microwave oven is high-
voltage, high-current equipment. Though it is free from danger
in ordinary use, extreme care should be taken during repair.
voltage, high-current equipment. Though it is free from danger
in ordinary use, extreme care should be taken during repair.
CAUTION
Servicemen should remove their watches whenever working close to
or replacing the magnetron.
or replacing the magnetron.
5.1. Check the earthing
Do not operate on a 2 wire extension cord. The microwave
oven is designed to be used in a completely earthed condition.
It is imperative, therefore, to make sure it is properly earthed
before beginning repair work.
oven is designed to be used in a completely earthed condition.
It is imperative, therefore, to make sure it is properly earthed
before beginning repair work.
5.2. If the door lock, the door
switch, the door seal or the
door develops a malfunction,
be sure not to operate the
oven until complete repairs
are made.
door develops a malfunction,
be sure not to operate the
oven until complete repairs
are made.
If the oven is operated with any of these parts in imperfect
condition, hazardous microwave leakage might occur.
condition, hazardous microwave leakage might occur.
WARNING
Never operate the oven until the following are confirmed:
(A) The door is tightly closed.
(B) There is no broken hinge or door arm.
(C) The door seal is not damaged.
(D) The door is not bent or warped.
(E) There is no other visible damage.
(A) The door is tightly closed.
(B) There is no broken hinge or door arm.
(C) The door seal is not damaged.
(D) The door is not bent or warped.
(E) There is no other visible damage.
5.3. Warning about the electric
charge in the high voltage
capacitor
capacitor
For about 30 seconds after the oven is turned off, an electric
charge remains in the high voltage capacitor.When replacing or
checking parts, remove the power plug from the outlet and
short the terminal of the high voltage capacitor (terminal of lead
wire from diode) to chassis ground with an insulated handle
screwdriver to discharge.
charge remains in the high voltage capacitor.When replacing or
checking parts, remove the power plug from the outlet and
short the terminal of the high voltage capacitor (terminal of lead
wire from diode) to chassis ground with an insulated handle
screwdriver to discharge.
WARNING
There is high-voltage present, with high-current capabilities in the
circuits of the high voltage winding and filament winding of the high
voltage transformer. It is extremely dangerous to work on or near
these circuits with oven energized.
DO NOT measure the voltage in the high voltage circuit including
filament voltage of magnetron.
circuits of the high voltage winding and filament winding of the high
voltage transformer. It is extremely dangerous to work on or near
these circuits with oven energized.
DO NOT measure the voltage in the high voltage circuit including
filament voltage of magnetron.
WARNING
Never touch any circuit wiring with your hand nor with an insulated
tool during operation.
tool during operation.
5 CAUTIONS TO BE OBSERVED WHEN
TROUBLESHOOTING
12
NE-1027 / NE-1037
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