Panasonic NN-GD376S Manual de usuario

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of law.

NN-GD376S

NN-GD366M

NN-GD356W

BPQ (U.K.)

EPG (France, Italy, Finland, Spain, Portugal, Greece,

Poland, Holland)

WPG (Switzerland)

Microwave Oven

ORDER NO.PHAMOS0605031C2

NN-GD376S / NN-GD366M / NN-GD356W

1 SCHEMATIC DIAGRAM 5

2 DESCRIPTION OF OPERATING SEQUENCE 6

2.1. Variable power cooking control 6

2.2. Inverter power supply circuit NEW H.V. 6

2.3. Inverter defrost, Auto menu & Auto reheat 6

3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING

3.1. Check the grounding 7

3.2. Inverter warnings 7

3.3. Part replacement. 8

3.4. When the 10A fuse is blown due to the operation of the

short switch: 8

3.5. Avoid inserting nails, wire etc. through any holes in the

unit during operation. 8

3.6. Confirm after repair 8

3.7. Sharp edges 8

4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 9

4.1. Magnetron 9

4.2. Digital programmer circuit (D.P.C) and membrane key

board. 9

4.3. Low voltage transformer and/or power relays (RY1, RY2)

4.4. Fan motor 10

4.5. Door assembly 11

4.6. Turntable motor 11

4.7. Quartz heater 12

4.8. H.V. Inverter Power Supply 12

5 COMPONENT TEST PROCEDURE 13

5.1. Primary latch switch (door switch and power relay B)

interlocks. 13

5.2. Short switch & monitor 13

5.3. Magnetron 13

5.4. Membrane key board (Membrane switch assembly) 13

5.5. Inverter power supply (U) 14

5.6. Temperature thermistor 14

6 MEASUREMENTS AND ADJUSTMENTS 15

6.1. Adjustment of Primary latch switch, Secondary latch

switch and Short switch. 15

6.2. Measurement of microwave output 15

7 TROUBLESHOOTING GUIDE 16

7.1. (Trouble) Oven stops operation during cooking 16

7.2. Trouble related to Digital Programmer Circuit 18

7.3. Troubleshooting of inverter circuit (U) and magnetron

NEW H.V. 19

7.4. Simple way of H.V. Inverter/magnetron troubleshooting

7.5. How to check the semiconductors using an OHM meter

8 EXPLODED VIEW AND PARTS LIST 21

8.1. EXPLODED VIEW 21

8.2. PARTS LIST 22

8.3. DOOR ASSEMBLY 23

8.4. WIRING MATERIALS 23

8.5. ESCUTCHEON BASE ASSEMBLY 24

8.6. PACKING AND ACCESSORIES 26

8.7. H.V. INVERTER MAIN PARTS LIST 26

9 DIGITAL PROGRAMMER CIRCUIT 27

9.1. SCHEMATIC DIAGRAM (NN-GD376S) 27

9.2. SCHEMATIC DIAGRAM (NN-GD366M, GD356W) 29

9.3. PARTS LIST 31

CONTENTS

Page Page

NN-GD376S / NN-GD366M / NN-GD356W

1 SCHEMATIC DIAGRAM

NN-GD376S / NN-GD366M / NN-GD356W

2.1. Variable power cooking

control

High Voltage Inverter Power Supply (U) controls output power

by the signal from Digital Programmer Circuit (DPC). Power

relay always stays ON, but PWM (pulse width modulation)

signal controls microwave 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.

Variable Power Cooking

POWER SETTING OUTPUT

POWER(%)

APPROX.

MANUAL MICROWAVE

DUTY

ON(SEC) OFF(SEC)

HIGH 100% 22 0

DEFROST 30% 17 5

MEDIUM 70% 22 0

MEDIUM-LOW 50% 22 0

SIMMER 30% 17 5

WARM 10% 9 13

2.2. Inverter power supply circuit

NEW H.V.

The Inverter Power Supply circuit powered from the line

voltage, 230-240V 50Hz AC input supplies 4,000V DC to the

magnetron tube, and functions in place of the H.V. transformer,

the H.V. capacitor and H.V. diode.

1. The AC input voltage 230-240V 50Hz is rectified to DC

voltage immediately.

2. DC voltage will be supplied to the switching devices called

IGBT. These devices are switched ON-OFF by the 20 to 40

kHz PWM (pulse width modulation) signal from the

microcomputer in the DPC.

3. This drives the High voltage transformer to increase voltage

up to 2,000V AC.

4. Then the half-wave doubler voltage rectifier circuit,

consisting of the H.V. diodes and capacitors, generates the

necessary 4,000V DC needed for the magnetron.

5. Output power of the magnetron tube is always monitored by

the signal output from the current transformer built into the

inverter circuit.

6. This signal is fed back to the microcomputer in the DPC to

determine operating conditions and output necessary to

control PWM signal to the Inverter Power Supply for control

of the output power.

2.3. Inverter defrost, Auto menu &

Auto reheat

When the Auto Control feature is selected and the Start pad is

tapped:

1. The digital programer 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.

Weight Deforst (Meat Items)

For BPQ models:

SELECTED WEIGHT COOKING TIME

1200 g 25 min.00 sec.

For EPG/WPG models:

SELECTED WEIGHT COOKING TIME

1200 g 21 min.30 sec.

Weight Cook(Fresh Vegetables)

For BPQ models:

SELECTED WEIGHT COOKING TIME

200 g 3 min.40 sec.

For EPG/WPG models:

SELECTED WEIGHT COOKING TIME

200 g 5 min.40 sec.

2. When cooking time in the display window has elapsed, the

oven turns off automatically by a control signal from the

digital programmer circuit.

2 DESCRIPTION OF OPERATING SEQUENCE

NN-GD376S / NN-GD366M / NN-GD356W

Unlike many other appliances, the microwave oven is a high

voltage, high current device. It is free from danger in ordinary

use, though extreme care should be taken during repair.

Caution

Servicemen should remove their watches whenever

working close to or replacing the magnetron.

3.1. Check the grounding

Do not operate on a two wire extension cord. The microwave

oven is designed to be grounded when used. It is imperative,

therefore, to ensure the appliance is properly grounded before

beginning repair work.

3.2. Inverter warnings

DANGER, HIGH VOLTAGE AND HIGH TEMPERATURE

(HOT/LINE) OF THE INVERTER POWER SUPPLY (U)

The high voltage inverter power supply handles very high

voltage and current for the magnetron tube. Though it is

free from danger in ordinary use, extreme care should be

taken during repair.

The aluminum heat sink is also energized with high voltage

(HOT), do not touch when the AC input terminals are

energized. The power device Collector is directly connected

to the aluminum heat sink.

The aluminum heat sink may be HOT due to heat energy,

therefore, extreme care should be taken during servicing.

WARNING FOR INVERTER POWER SUPPLY (U)

GROUNDING

Check the high voltage inverter power supply circuit

grounding. The high voltage inverter power supply circuit

board must have a proper chassis ground. The inverter

grounding bracket must be connected to the chassis. If the

inverter board is not grounded it will expose the user to very

high voltages and cause extreme DANGER! Be sure that

the inverter circuit is properly grounded via the inverter

earth bracket.

WARNING! DISCHARGE THE HIGH VOLATGE

CAPACITORS

For about 30 seconds after the oven is turned off, an

electric charge remains in the high voltage capacitors in the

inverter power supply circuit board.

When replacing or checking parts, remove the power plug

from the outlet and short the inverter output terminal of the

magnetron filament terminals to the chassis ground with an

insulated handle screwdriver to discharge. Please be sure

to touch the chassis ground side first and then short to the

output terminals.

WARNING

There is high voltage present with high current capabilities

in the circuits of the primary and secondary windings, choke

coil and heat sink of the inverter. It is extremely dangerous

to work on or near these circuits with the oven energized.

DO NOT measure the voltage in the high voltage circuit

including the filament voltage of the magnetron.

WARNING

Never touch any circuit wiring with your hand or with an

insulated tool during operation.

3 CAUTIONS TO BE OBSERVED WHEN

TROUBLESHOOTING

NN-GD376S / NN-GD366M / NN-GD356W

3.3. Part replacement.

When any part or component is to be replaced, always ensure

that the power cord is removed from the wall outlet.

3.4. When the 10A fuse is blown

due to the operation of the

short switch:

WARNING

When the 10A 250V fuse is blown due to the operation of

the interlock monitor switch, replace all of the components

(primary latch switch, secondary latch switch, short switch

and power relay B (RY1)).

1. This is mandatory. Refer to “adjustments and

measurements” for the location of these switches.

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

appropriate rating for these models.

3. When replacing faulty switches, be sure the mounting

tabs are not bent, broken or deficient in their ability to

hold the switches.

3.5. 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

lamp holes on the cavity or any holes or gaps, because such

objects may work as an antenna and cause microwave

leakage.

3.6. 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.

3. Check for microwave energy leakage. (Refer to procedure

for measuring microwave energy leakage).

CAUTION MICROWAVE RADIATION

USE CAUTION NOT TO BECOME EXPOSED TO

RADIATION FROM THE MICROWAVE MAGNETRON OR

OTHER PARTS CONDUCTING MICROWAVE ENERGY

IMPORTANT NOTICE

The following components have potentials above 2000V

while the appliance is operated.

•Magnetron

•High voltage transformer (Located on inverter (U))

•High voltage diodes (Located on inverter (U))

•High voltage capacitors (Located on inverter (U))

Pay special attention to these areas.

When the appliance is operated with the door hinges or

magnetron installed incorrectly, the microwave leakage can

exceed more than 5mW/cm2. After repair or exchange, it is

very important to check if the magnetron and the door

hinges are correctly installed.

3.7. Sharp edges

Caution

Please use caution when unpacking, installing or moving

the unit, as some exposed edges may be sharp to the touch

and cause injury if not handled with care.

NN-GD376S / NN-GD366M / NN-GD356W

4.1. Magnetron

1. Discharge the high voltage capacitor.

2. Remove 1 screw holding air guide A on the magnetron.

3. Remove 1 screw holding reinforce bracket on the

magnetron.

4. Remove 1 screw holding thermistor on the magnetron.

5. Disconnect 2 high voltage lead wires from magnetron

filament terminals.

6. Remove 4 screws holding magnetron.

NOTE:

After replacement of the magnetron, tighten mounting

screws properly in an x pattern, making sure there is no

gap between the waveguide and the magnetron to

prevent microwave leakage.

CAUTION

When replacing the magnetron, be sure the antenna gasket is in

place.

CAUTION

When connecting 2 filament lead wires to the magnetron terminals,

be sure to connect the lead wires in the correct position. The lead wire

of high volatge transformer should be connected to “F terminal” and

the lead wire from high voltage capacitor should be connected to “FA

terminal”.

4.2. Digital programmer circuit

(D.P.C) and membrane key

board.

NOTE:

Be sure to ground any static electric charge built up on

your body before handling the DPC.

1. Disconnect all connectors from D.P.C. board.

2. Disconnect connector CN701 from H.V. inverter.

3. Unplug flat cabel from CN6 on D.P.C. board (DU) by

carefully pulling outward.

4. Remove 2 screws holding small D.P.C. board (DU) on

backstop.

5. Remove 4 screws holding backstop on big D.P.C. board

(DU).

4 DISASSEMBLY AND PARTS REPLACEMENT

PROCEDURE

NN-GD376S / NN-GD366M / NN-GD356W

To replace pop-up dial

Remove pop-up dial from small D.P.C. board (DU) by

pulling it straight out.

6. Release 2 locking tabs on escutcheon base to remove big

D.P.C. board (DU)

7. Remove 4 screws holding D.P.C. board (AU) on

escutcheon base.

8. Release 6 locking tabs on escutcheon base to remove

D.P.C. board (AU).

To replace membrane key board

Use such as knife etc. tools poke from the edge of

escutcheon sheet and peel off escutcheon sheet and

membrane key board completely from escutcheon base.

NOTE:

1. The membrane key board is attached to the

escutcheon base with double faced adhesive tape.

Therefore, applying hot air such as using a hair dryer is

recommended for smoother removal.

2. When installing new membrane key board, make

sure that the surface of escutcheon base is cleaned

sufficiently so that any problems (shorted contacts or

uneven surface) can be avoided.

3. Alignment position of membrane key board is as

follows;

Membrane key board: Right and upper edges

Escutcheon sheet: Right and upper edges

4.3. Low voltage transformer

and/or power relays (RY1,

RY2)

NOTE:

Be sure to ground any static electric charge built up on

your body before handling the DPC.

1. Using solder wick or a desoldering tool and 30W soldering

iron carefully remove all solder from the terminal pins of the

low voltage transformer and/or power relays.

NOTE:

Do not use a soldering iron or desoldering tool of

more than 30 watts on D.P.C. contacts.

2. With all the terminal pins cleaned and separated from

D.P.C. contacts, remove the defective transformer/power

relays, Replace components making sure all terminal pins

are inserted completely resolder all terminal contacts

carefully.

4.4. Fan motor

1. Disconnect 2 lead wires from fan motor terminals.

2. Remove 3 screws holding orifice assy and detach the orifice

assy from oven assy.

3. Remove fan blade from the motor shart by pulling it stralght

out.

4. Remove 2 screws holding fan motor on orifice assy and

detach the fan motor from orifice assy.

NN-GD376S / NN-GD366M / NN-GD356W

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