Panasonic NN-C2000W, NN-C2000P User Manual

NN-C2000P NN-C2000W

MOD0009237C3

Microwave Oven

NN-C2000P / NN-C2000W

CONTENTS

Page Page

1 FEATURE CHART 4 2 CONTROL PANEL

3 OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST

PROCEDURE

4 SCHEMATIC DIAGRAM (FOR QPQ, JPG) 7

5 SCHEMATIC DIAGRAM (FOR MNQ, YNQ, TNE, LNK, SNM,

KNQ, KKE) 6 DESCRIPTION OF OPERATING SEQUENCE 7 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 8 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 9 COMPONENT TEST PROCEDURE 10 MEASURE MENTS AND ADJUSTMENTS 11 TROUBLE SHOOTING GUIDE (NEW H.V.)

12 14 18 21 22

12 HOW TO CHECK THE SEMICONDUCTORS USING AN OHM

METER

13 EXPLODED VIEW AND PARTS LIST 14 PARTS LIST 15 DOOR ASSEMBLY

8 9

16 ESCUTCH EON BASE ASSEMBLY 17 PACKING AND ACCESOR IES 18 WIRING MATERIAL 19 REF. NO. 47 H. V. INVERTER (U) 20 R EF NO . E2 P. C. BOARD D (U) 21 R EF NO . E3 P. C. BOARD F (U) 22 DIGITAL PROGRAMMER CIRCUIT 23 INVERTER CIRCUIT

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30 31 33 34 35 36 37 37 38 40 42

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1 FEATURE CHART

2 CONTROL PANEL

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3 OPERATION AND DIGITAL PROGRAMMER CIRCUIT

TEST PROCEDURE

4 SCHEMATIC DIAGRAM (FOR QPQ, JPG)

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5 SCHEMATIC DIAGRAM (FOR MNQ, YNQ, TNE, LNK,

SNM, KNQ, KKE)

6 DESCRIPTION OF OPERATING SEQUENCE

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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

NOTE: When Broil feature is selected, oven temperature is determined automatically as shown in Figure.

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.

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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 1turns 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

convection, the temperatures by each program are preprogrammed in the microprocessor as shown in Figure.

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.

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 timeby 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.

Balance of cooking time (T2 time)

The balance of cooking time which is called T2 time, can be calculated by the following formula.

T2 time (in sec.) = T1 time × K factor

NOTE: Remember, the T1 time starts after the Start pad is tapped. The coefficient K is programmed into the microprocessor memory and they are listed in the following tables along with the P1 and P2 powers.

NOTE: When "More" or "Less" pad is selected, the K factor varies resulting in T2 time to be increased or decreased.

NOTE: For T2 time of Category Casserole, HEATER operation programmed.

Example of calculating theT2 time

Example 1: If the T1 time is measured to be 2 minutes and 40 seconds, and the Auto Sensor program selected is Sensor Reheat.

T2 = T1 × K = 2 min. and 40 sec. × 0.3 = 48 sec.

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7 CAUTIONS TO BE OBSERVED WHEN

TROUBLESHOOTING

Unlike many other appliances, the microwave oven is highvoltage, high-current equipment. Though it is free from danger in ordinary use, extreme care should be taken during repair.

7.1. Check the grounding

Do not operate on a 2-wire extension cord. The microwave oven is designed to be used when grounded. It is imperative, therefore, to make sure it is grounded properly before beginning repair work.

7.2. Inverter Warnings (NEW H.V.)

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lamp holes on the cavity or any other holes gaps, because such objects may work as an antenna and cause microwave leakage.

7.6. Confirm after repair

1. After repair or replacement of parts, make sure that the screws of the oven, etc. are neither loose nor missing. Microwaves might leak if screws are not properly tightened.

2. Make sure that all electrical connections are tight before inserting the plug into the wall outlet.

7.3. When parts must be replaced, remove the power plug from the outlet.

7.4. When the 10A 250V fuse is blown due to the operation of short switch:

1. This is mandatory. Refer to "Adjustments and

Measurement" for these switches.

2. When replacing the fuse, confirm that it has the appropriate

rating for these models.

3. When replacing faulty switches, be sure mounting tabs are

not bent, broken or otherwise deficient in their ability to hold the switches.

7.5. Avoid inserting nails, wire, etc. through any holes in the unit during operation.

Never insert a wire, nail or any other metal object through the

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