Panasonic NN-C2000P User manual

©2000 Matsushita Electric Industrial Co., Ltd. All
rights reserved. Unauthorized copying and
distribution is a violation of law.
NN-C2000P
NN-C2000W
Microwave Oven
MOD0009237C3

1 FEATURE CHART 4
2 CONTROL PANEL 5
3 OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST
PROCEDURE 6
CONTENTS
Page Page
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4 SCHEMATIC DIAGRAM (FOR QPQ, JPG) 7
5 SCHEMATIC DIAGRAM (FOR MNQ, YNQ, TNE, LNK, SNM,
KNQ, KKE) 8
6 DESCRIPTION OF OPERATING SEQUENCE 9
7 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
12
8 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE
14
9 COMPONENT TEST PROCEDURE 18
10 MEASUREMENTS AND ADJUSTMENTS 21
11 TROUBLESHOOTING GUIDE (NEW H.V.) 22
12 HOW TO CHECK THE SEMICONDUCTORS USING AN OHM
METER 29
13 EXPLODED VIEW AND PARTS LIST 30
14 PARTS LIST 31
15 DOOR ASSEMBLY 33
16 ESCUTCHEON BASE ASSEMBLY 34
17 PACKING AND ACCESORIES 35
18 WIRING MATERIAL 36
19 REF. NO. 47 H. V. INVERTER (U) 37
20 REF NO. E2 P. C. BOARD D (U) 37
21 REF NO. E3 P. C. BOARD F (U) 38
22 DIGITAL PROGRAMMER CIRCUIT 40
23 INVERTER CIRCUIT 42
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1 FEATURE CHART
4
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2 CONTROL PANEL
5
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3 OPERATION AND DIGITAL PROGRAMMER CIRCUIT
TEST PROCEDURE
6
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4 SCHEMATIC DIAGRAM (FOR QPQ, JPG)
7
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5 SCHEMATIC DIAGRAM (FOR MNQ, YNQ, TNE, LNK,
SNM, KNQ, KKE)
8
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6.1. Variable power cooking
control
HIGH VOLTAGE INVERTER POWER SUPPLY (U) controls
output power by the signal from Digital Programmer Circuit
(DPC). Power relay 1 stays on but the inverter drive signal to
control it's output power.
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.
6.2. Turbo weight defrost
When auto weight defrost is selected and the Start Pad is
tapped:
1.The digital programmer circuit determines the power level
and cooking time to complete cooking and indicates the
operating state in the display window. Table shows the
corresponding cooking times for respective serving by
categories.
2.When cooking time in the display window has elapsed, the
oven turns off automatically by a control signal from the
digital programmer circuit.
6.3. Convection/Grill cooking
control
The digital programmer circuit controls the ON-OFF time of the
heater in order to control oven cavity temperature.
1.After the start pad is tapped with the desired Bake/Broil
program set, an 18V DC signal comes out of the digital
programmer circuit and is applied to coil of power relay 7
(RY7).
2.When the contacts of power relay 7 close, power source
voltage is applied to the heater and the heater turns on.
3.When the oven temperature reaches the set temperature,
the digital programmer circuit senses the temperature
through oven temp sensor and stops supplying an 18V DC
signal to the coil of power relay 7 and the heater turns off.
4.After the heater turns off, the oven temperature will
continue increasing a while and then decrease as shown in
Figure. When the oven temperature drops below the set
temperature, the digital programmer circuit senses the
signal and starts supplying an 18V DC signal to the coil of
power relay again.
NOTE: When Broil feature is selected, oven temperature is
determined automatically as shown in Figure.
6 DESCRIPTION OF OPERATING SEQUENCE
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6.4. Combination cooking control
Combination cooking is accomplished by microwave and
convection cooking being done alternately during one
combination cooking cycle. One combination cooking cycle is
22 seconds.
1.During combination cooking, the digital programmer circuit
controls ON-OFF time of both power relay 1 and 7 as
shown in Figure.
2.When the power relay 1 (RY1) is turned on, heater turns off
and after the power relay 1 turns off, power relay 7 turns on.
NOTE 1: Note that the heater may not be on during a heater
on period if the preprogrammed oven temperature has
been reached. This is due to the fact that the oven is
keeping the preprogrammed oven temperature constant,
so of course the heater will only be on when it is needed
and off when it is not needed.
NOTE 2: As for temperatures of combination cooking for
6.5. One touch Auto sensor
cooking
Auto sensor cooking is a revolutionary way to cook by
microwave without setting a power level or selecting a time. All
that is necessary is to select an Auto sensor Program before
starting to cook.
Understanding of Cooking
As food cooks, a certain amount of steam is produced. If the
food is covered, this steam builds up and eventually escapes
from the container. In Auto Sensor Cooking, carefully designed
instrument, called the humidity sensor element, senses this
escape of steam. Then, based upon the Auto Sensor Program
selected, the unit will automatically determine the correct power
level and the proper length of time it will take to cook the food.
NOTE: Auto Sensor Cooking is successful with the foods
and recipes found in the Auto Sensor Cooking Guide.
convection, the temperatures by each program are
preprogrammed in the microprocessor as shown in Figure.
Because of the vast differences in food composition, items
not mentioned in the Cooking Guide should be prepared in
the microwave oven using power select and time features.
Please consult Variable Power Microwave Cookbook for
procedures.
Explanation of the Auto Sensor Cooking process
1) The shaded columns in Figure indicate when the humidity
sensor heater is on.
2) During the 30 second period there is no microwave activity.
When calculating the T2 time by using the formula below, make
sure this 30 seconds is subtracted from the T0 time.
3) T1 time To time - 30 seconds
4) T2 time When the steam escapes from the cooking
container placed in the oven, the humidity sensor detects it and
the microprocessor calculates the balance of cooking time.
This T2 time is then shown in the display and begins counting
down.
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