Panasonic NN-A774SBEPG Bedienungsanleitung

MOP0408003S2

Microwave Oven

NN-A774SBEPG

NN-A734MBEPG

NN-A764WBEPG

NN-A764WBWPG

! WARNING

This service information is designed for experienced repair technicians only and is not designed for use by the

general public. It does not contain warnings or cautions to advise non-technical individuals of potential dangers

in attempting to service a product. Products powered by electricity must be serviced or repaired only by expe-

rienced proffesional technicians. Any attempt to service or repair the product or products dealt with this service

information by anyone else could result in serious injury or death.

There are special components used in this equipment which are important for safety. These parts are marked

by (!) in the schematic diagrams, circuit board diagrams, exploded views and replacement parts lists. It is

essential that these critical parts are replaced with parts specified by the manufacturer, preventing shock, fire

or other hazards. Do not modify the original design without permission from the manufacturer.

IMPORTANT SAFETY NOTICE

EPG

Power source 230 V AC Single Phase 50Hz

Power requirements Microwave 1250W

Grill 1350W

Convection 1470W

Combi 2770W

Output (IEC60705) Microwave 1000W

Grill1300W

Convection 1400W

Microwave frequency 2450Mhz

Timer 99 min 99 second

Oven cavity size 27L

Outside dimensions 510mm(W) x 477mm(D) X 304MM (H)

Inside dimensions 359mm(W) X 352mm(D) x 217mm(H)

Weight 15Kg

Specifications subject to change without notice

WPG

Power source 230 V AC Single Phase 50Hz

Power requirements Microwave 1260W

Grill 1360W

Convection 1470W

Combi 2150W

Output (IEC60705) Microwave 1000W

Grill1300W

Convection 1400W

Microwave frequency 2450Mhz

Timer 99 min 99 second

Oven cavity size 27L

Outside dimensions 510mm(W) x 477mm(D) X 304MM (H)

Inside dimensions 359mm(W) X 352mm(D) x 217mm(H)

Weight 15Kg

Specifications subject to change without notice

1 Contents

1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Feature Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Inverter Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Schematic Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7 Description of the Operation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

8 Cautions to be Observed when Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

9 Part Replacement Proceedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

10 Component Test Proceedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

11 Measurements and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

12 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

13 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

14 Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

15 Door Assy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

16 Escutcheon Base. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

17 Packing and Accesories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

18 Trim Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

19 Digital Programmer Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2FeatureChart

Function EPG Models

Microwave 4

Grill 1

Convection 17

Combi Yes

Weight Reheat 1

Weight Cook 4

Weight Combination 11

Weight Defrost 2

Weight Crisp 1

Delay / Stand Yes

Kg / lb No

Stage Cooking 1

Clock 24 h

Word prompt French, Dutch, English, German,

Italian, Spanish, Polish, no lan-

guage

Function WPG Model

Microwave 4

Grill 1

Convection 17

Combi Yes

Weight Reheat 1

Weight Cook 4

Weight Combination 9

Weight Defrost 2

Weight Crisp 0

Delay / Stand Yes

Kg / lb No

Stage Cooking 1

Clock 24 h

Word prompt French, German, English, Ital-

ian, no language

3 Control Panel

(1)

(2)

NN-A774/NN-A734/NN-A764*

1min 10s

1h 10min

Combi

1-2-3

Panacrunch

AUTO / g

(3)

(4)

(5)

(6)

(7)

(8)

(11)

(15)

(10)

(12)

(13)

(14)

(9)

(1) Display Window

(2) Time Pads

(3) Microwave Power Pad

(4) Grill Power Pad

(5) Convection Pad

(6) Grill Convection Pad

(7) Combination Pad

(8) Auto Defrost Pad

(9) Weight Select Pads

(10) Clock Pad

(11) Delay/Stand Pad

(12) Auto Weight Program Pads

(13) Panacrunch Program Pads

(14) Start Pad:

Press to start operating the oven.

If during cooking the door is opened or

Stop/Cancel Pad is pressed once, Start

Pad has to be pressed again to continue

cooking.

(15) Stop/Cancel Pad:

Before cooking: one press clears your

instructions.

During cooking: one press temporarily

stops the cooking program. Another press

cancels all your instructions and the time of

day will appear in the display.

*The design of your control panel may vary from

the panel displayed (depending on colour), but the

words on the pads will be the same.

4 Inverter Warnings

The inverter circuit board supplies the magnetron tube with a very high voltage (4000 volts).

Danger

• The inverter circuit board operates at high voltages

and high temperatures.

The Inverter PCB

• Operates at a very high voltage and current.

• Has an aluminium heat sink which becomes very

hot.

• Has capacitors in the circuitry that hold a high volt-

age charge even when the oven is not operating.

Warning

• Do not touch the high voltage circuit. When replac-

ing the board care must be taken to avoid possible

electric shock.

• Do not touch the aluminium heat sink as it is part of

the high voltage circuit and becomes very hot.

• Do not attempt to repair the inverter PCB, this

can be very dangerous. Replace the high volt-

age inverter circuit as a complete unit.

• Do not adjust or tamper with the pre-set volume on

the inverter board. It is very dangerous to adjust

this pre-set without proper test equipment.

• Do not operate the microwave oven when the

inverter grounding plate and fixing screw is loose.

It is very dangerous to operate the inverter circuit

board without a proper ground connection.

figure 1Assembly of the inverter circuit board

HEAT SINK

RECTIFIER BRIDGE

CHOKE COIL

SAND BAR RESISTOR

CURRENT TRANSFORMER

HIGH VOLTAGE TRANSFORMER

PRESET VOLUME *4

(DO NOT ADJUST)

FILM CAPACITORS

HIGH VOLTAGE

DIODES

HIGH VOLTAGE

CAPACITORS

CN 702

CN 703

CN 701

CONTROL BOARD

WITH CUSTOM IC

PHOTOCOUPLER

DO NOT TOUCH

HOT/HIGH VOLTAGE *2

HIGH VOLTAGE AREA *1

H.V.INVERTER(U)

INVERTER SUPPORT BRACKET

GROUNDING BRACKET

5 Schematic Diagram

SW1

SW2

SW3

SW4

SW5

NOISE FILTER

P240

SECONDARY INTER-

LOCK SWITCH

PRIMARY INTER-

LOCK SWITCH

GROUNDING

CHASSIS GROUND

FUSE

FAN MOTOR

POWER RELAY

OVEN LAMP

DIODE

RY1

VARISTOR

RY6

Note : Door is closed.

Unit is not operated

Y/G

2.0mH

4700pF

AC230-240V

50Hz

75k

2.2M

2.0mH

SW3

MONITOR DEVICE

TURN TABLE MOTOR

THERMAL CUT OUT

(OVEN)

(MAGNETRON)

SW5

RY1

CN3

CN4

3SW4

CN5

CN6

P.C.B AU

2.2F Fm

16A

P.C.B DU

CN702

13CN703

MAGNETRON

2M236-M42

321CN701

E701

INV.

INVERTER P.C.B.

RY4

HEATER

8A 0R 10A

RY5

RY2

9511

RY3

RY6

DIGITAL PROGRAMMER CIRCUIT

( 8.00MHz )

CN1

SW1

CN7

Temperature sensor

SW2

6 Wiring Diagram

NOTE WHEN REPLACIN ANY COMPONENT S RECONNECT THE WIRE HARNESS

ACCORDIN T O THE COLOURS BELOW

COL OURS INDICATED INSIDE BRACKETS () INDICATE THE COLOUR O

THE CONNECTOR HOUSIN

MA NETRON

HI H OL TA E IN ER TER

CAUTION

HEAT SINK

(HOTLIE)

ER Y HI H OL TA E

AND TEMPERATURE

1C2

PRIMARY LATCH SWITCH

TOP

(WH) WH

SECONDARY LATCH SWITCH

OUTSIDEBOTTOM

(N)

(YE) YE

SHORT SWITCH

INSIDEBOTTOM

POWER RELAY

(RY1)

(N)

SYMBOL COLOUR

BL BLUE

BK BLACK

BR BROWN

WH WHITE

YE YELLOW

N NATURAL

R RED

7 Description of the Operating Sequence

7.1 Variable power cooking control

The output power is controlled by the inverter power

supply. The level of output from the inverter circuit is

controlled by a pulse width modulated signal from the

digital programmer circuit (DPC). The digital program-

mer circuit operates relay RY1 to supply power to the

inverter circuit.

NOTE: If the microwave cooking time is longer than 3

minutes, the cooling fan will operate for 1 minute to

cool the oven and its electronic components.

7.2 Auto weight defrost, Auto weight

Cook

When an auto control feature is selected and the start

pad pressed:

1. The digital programmer circuit determines the

power level and the cooking time and indicates the

operating state in the display. The table shows the

corresponding cooking times and weights for the

selected category.

2. When the cooking time in the display window has

elapsed, the oven turns off automatically via the

control signal from the digital programmer circuit.

Note: After auto cooking if the oven temperature

is over the predetermined temperature the fan

motor rotates to cool the oven and its compo-

nents.

EPG MODEL

Auto weight defrost

Auto Weight Cook

WPG MODEL

Auto weight defrost

Category 1st Touch weight Cooking time

Defrost Small Pieces 300g 5 Min 40 Sec

Defrost Big Piece 600g 7 Min 30 Sec

Frozen Bred 100g 3 Min 55 Sec

Category 1st Touch volume/weight Cooking time

1. Cup 150cc 1 Min 20 Sec

2. Bowl 300cc 2 Min 20 Sec

3. Reheat Meal 500g 3 Min 35 Sec

4. Gratin 400g 12 Min 00 Sec

5. Fresh Vegetables 500g 12 Min 30 Sec

6. Fresh Fish 300g 4 Min 00 Sec

7. Chicken Pieces 500g 13 Min 00 Sec

8. Whole Chicken 1200g 21 Min 55 Sec

9. Pork 1000g 28 Min 20 Sec

10. Beef 800g 23 Min 25 Sec

11. Lamb 1200g 28 Min 00 Sec

12. Chilled Pizza 300g 8 Min 10 Sec

13. Frozen Pizza 200g 10 Min 00 Sec

14. Chilled Quiche 300g 6 Min 54 Sec

15. Frozen Quiche 300g 11 Min 30 Sec

16. Fries 300g 14 Min 00 Sec

Category 1st Touch weight Cooking time

Small Pieces 500g 6 Min 42 Sec

Big Pieces 1000g 21 Min 15 Sec

Frozen Bread and Rolls 50g 6 Min 00 Sec

Auto Weight Cook

Category 1st Touch weight Cooking time

1. Reheat 300g 3 Min 00 Sec

2. Frozen Reheat 300g 7 Min 00 Sec

3. Vegetables 500g 10 Min 20 Sec

4. Fish 500g 5 Min 00 Sec

5. Rice 200g 14 Min 45 Sec

6. Rice Pudding 600g 4 Min 00 Sec

7. Roast Pork 1000g 36 Min 20 Sec

8. Roast Beef 700g 16 Min 25 Sec

9. Poultry 500g 16 Min 15 Sec

10. Frozen Chicken Pieces 500g 23 Min 50 Sec

11. Jacket Potatoes 500g 14 Min 00 Sec

12. Fresh Lasagne Gratin 1000g 20 Min 20 Sec

13. Frozen Pizza 300g 12 Min 30 Sec

14. Frozen Potato products 300g 17 Min 00 Sec

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