Panasonic NN-A750WB Bedienungsanleitung

Order Number MOP00080014C2

Microwave Oven

NN-A750WB

NN-A720MB

NN-A770SB

27L

WHITE SILVER STAINLESS

United Kingdom

Specification

Power Source 240VAC Single phase, 50Hz

Power Requirements Micro 1260W Grill 1360W Conv 1470w Combi

2770W

Output (IEC705-88) Micro 1000W Grill 1300W Conv 1400W

Microwave Frequency 2450MHz

Timer

99 Minutes 99 Seconds

Oven Cavity Size 27L

Outside Dimensions 510mm(W) x 477mm(D) x 314mm(H)

Inside Dimensions 359mm(W) x 352mm(D) x 217mm(H)

Weight 15Kg

rights reserved. Unauthorized copying and distribu-

tion is a violation of law.

1 Inverter Warning

The inverter board looks like a regular PCB, however, this PCB

drives the magnetron tube using very high voltages and cur-

rent.

It has

1. Very high voltage and high current

2. An Aluminium heat sink that becomes very hot

3. The capacitors on the inverter circuit will contain a high

voltage charge even when the oven is not operating.

Do not

1. Do not touch the circuitry as it contains very high volt-

ages. When replacing the board please take extreme

care to avoid possible electric shock. High voltages may

remain in the circuit.

2. Do not touch the aluminium heat sink as it will become

very hot. It also contains high voltages.

3. Do not attempt to repair the inverter PCB as this can be

very dangerous. Replace the high voltage inverter circuit

as a complete unit. Return the old unit fully repacked in

the original shipping box and completed paper work.

4. Do not adjust or tamper with the preset volume on the

inverter board. It is very dangerous to adjust this preset

without proper test equipment.

5. Do not test the oven while the inverter grounding strip or

screws are loose. It is very dangerous to operate the

inverter circuit board with out a proper ground connection.

Inverter Power Supply Diagram

Figure 1

Inverter Layout

Figure 2

2 Feature Chart

Function

Microwave 6

Grill 3

Convection 17

Combination YES

Weight Defrost 3

Weight Combination 8

Weight Reheat 4

Weight Cook 2

Stage Cooking 3 Stage

Delay / Stand Yes

Kg lb./oz. Yes

Clock 12 Hour

Word Prompt English

3 Control Panels

4 Operation And Digital Programmer Circuit Test Procedure

4.1. Setting The Clock

4.2. Microwave Cooking

4.3. Auto Weight Defrost

4.4. Delay Stand

4.5. Delay Start

4.6. Grill Operation

4.7. Convection Operation

(1) Plug the power supply

cord into the wall outlet

(2) Press the clock pad

(3) Enter the time of the day

(4) Press the clock pad

(1) Place a water load in the

oven

(2) Press Micro power once

to set high power

(3) Set time at 5 sec. by

pressing

1 sec. pad 5 times

(4) Press Micro power pad 3

times to set medium

power

(5) Set pad for 1 minute by

pressing 1 min. pad once

(6) Press the start pad

(7) When the first stage

cooking has elapsed

oven automatically

switches to second stage

(8) When second stage

cooking has elapsed

oven bleeps 5 times and

shuts off

(1) Select the desired pro-

gram

(2) Press g or lb. and oz.

(3) Enter the weight by

pressing the Up & Down

Pads.

(4) Press Start

(1) Set power level and time

(2) Press Stand

(3) Set standing time

(4) Press Start

(1) Press delay

(2) Set delay time

(3) Set power level and time

(4) Press start pad

(1) Select grill power press

once for grill 1

(2) Set cooking time

(3) Press start

(1) Press convection pad to

select oven temperature

(2) Press start to preheat

(3) Press time pads to enter

cooking time

(4) Press start pad

4.8. Turbo Bake Operation

4.9. Combination Cooking (Convec-

tion And Microwave)

4.10. Combination Cooking (Grill

And Microwave)

4.11. Combination Cooking (Turbo

Bake And Microwave)

(1) Press turbo bake pad to

select oven temperature

(2) Press grill pad to select

grill power

(3) Press start to preheat

(4) Press time pads to enter

cooking time

(5) Press start

(1) Press combination pad

(2) Press convection pad to

select oven temperature

(3) Select micro power

(4) Press start if preheating

(5) Set cooking time

(6) Press start pad

(1) Press combination pad

(2) Press grill pad to select

oven temperature

(3) Select micro power

(4) Set cooking time

(5) Press start pad

(1) Press combination pad

(2) Press convection pad to

select oven temperature

(3) Select micro power

(4) Press start if preheating

(5) Set cooking time

(6) Press start pad

4.12. Auto Weight Cook Programs

(1) Select the desired auto

weight cook program

(2) Press to select grams or

pounds and ounces

(3) Enter the weight by

pressing the up and down

pads

(4) Press Start

5 Schematic Diagram

6 Wiring Diagram

7 Description of Operating instruction

7.1. Variable power cooking control

The HIGH VOLTAGE INVERTER POWER SUPPLY controls

the output power by a signal from the digital Programmer circuit

DPC. The power relay (RY1) turns on to supply power to the

inverter circuit. The level of output power is controlled by the

drive signal level form the inverter circuit.

NOTE1: The ON/OFF time ratio does not correspond with

the percentage of microwave power since approximately 2

seconds are required for heating the magnetron filament.

NOTE: 2 If microwave cooking is over 8 minutes on HIGH

power, the fan motor rotates for 1 minute after cooking to

cool the oven and electrical components.

Duty cycles for microwave cooking

7.2. Grill Cooking

The digital programmer circuit controls the grill power by oper-

ating the power relay RY4 in the sequence shown in the table

below

Duty cycles for Grill Cooking

7.3. 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 for each category and its respective weight.

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 components.

Auto Weight Defrost

Auto weight Cook

Output Duty ON/OFF

ON time OFF time

High 1000W 22” 0”

Defrost 440W 16” 6”

Medium 600W 22” 0”

Low 440W 22” 0”

Simmer 440W 15” 7”

Warm 440W 8” 14”

Duty ON/OFF

ON Time OFF Time

Grill 1 33” 0”

Grill 2 24” 9”

Grill 3 18” 15”

Category 1st Touch Weight Cooking Time

Bread 100g 45s

Meat Items 200g 2m 10s

Meat Joints 400g 6m 20s

Category 1st Touch Weight Cooking Time

1.Curry 300g 3m 30s

2.Chinese Style 200g 2m 10s

3.Pasta 250g 2m 55s

4.Casserole 300g 3m 15s

5.Fresh Fish 100g 1m 30s

6.Fresh Vegetables 100g 2m 20s

7.Chilled Crispy Top 300g 8m

8.Frozen Crispy Top 300g 12m

9.Jacket Potatoes 200g 9m

10.Frozen Potato Products 200g 8m

11.Whole Chicken 1000g 19m 20s

12.Lamb/Beef 500g 14m 40s

13.Chilled Pizza 200g 6m 40s

14.Frozen Pizza 200g 9m

7.4. Convection Cooking

1. The digital programmer circuit operates the power relays

RY3,RY5 and RY6 in the sequence as shown in the fig-

ure below.

2. When the oven reaches a predetermined temperature the

digital programmer circuit stops supplying power to relay

RY5, resulting in the convection heater turning off.

3. When the temperature drops below the predetermined

temperature, the digital programmer circuit supplies

power to power relay RY5 resulting in the convection

heater turning on.

Note: After the convection process, if the oven tempera-

ture is higher than the predetermined temperature, the

fan motor rotates to cool the electronic components and

the oven.

Convection Cooking Duty Cycles

Figure1

7.5. Combination Cooking

Combination cooking is achieved by operating the microwave

and heater modes together during one cooking cycle. There

are three combination modes.

1. Combination (convection and microwave)

2. Combination (grill and microwave)

3. Combination (grill, convection and microwave)

The digital programmer circuit operators the power relays as

shown in the figures below.

When the oven temperature reaches the predetermined tem-

perature, the digital programmer circuit stops supplying power

to relay (RY5) resulting in the convection heater turning off.

During this time the digital programmer circuit continues to

operate relay (RY1) so that microwave activity continues at the

duty cycle selected. The inverter control signal level is also

maintained. The microwave activity continues to cycle until the

entire cooking program is completed.

When the oven temperature drops below the selected tempera-

ture, the digital programmer circuit operates power relay (RY5)

switching on the heater elements.

In the case of grill combination the sequence applies with the

digital programmer circuit switching power relay (RY4) to con-

trol, the grill elements.

With convection, grill and micro power combination. The grill

elements and convection elements are operated alternatively

whilst the oven temperature is above the selected level.

Convection And Microwave Combination Duty Cycles

Grill And Microwave Combination Duty Cycles

Grill Convection And Microwave Combination Duty Cycles

Convection And Microwave Duty Cycles

Figure 1

Convection Heater Micropower

100 - 250 C OUTPUT ON OFF

Medium 600W 22 0

Low 440W 22 0

Simmer 440W 14 8

Warm 440W 7 15

Grill Heater Micropower

ON OFF OUTPUT ON OFF

Grill 1 66 0 Medium 600W 22 0

Grill 2 48 18 Low 440W 22 0

Grill 3 36 30 Simmer 440W 14 8

Warm 440W 7 15

Convection

Heater

Grill Heater Micropower

100 - 250 C ON OFF OUTPUT ON OFF

Grill 1 66 0 Medium 600W 22 0

Grill 2 48 18 Low 440W 22 0

Grill 3 36 30 Simmer 440W 14 8

Warm 440W 7 15

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