Panasonic NN-CT878SBPQ Bedienungsanleitung

HAD0712001C2

Microwave Oven

NN-CT878SBPQ

32L

United Kingdom

Chaos

Defrost

Vegetables

Potatoes

Fish

Pizza

Chicken

Meat

Crispy Top

Bake

min

sec

Micro Power Grill 1-2-3

Convection

Combination

Turbo-Bake

Memory

Timer

Start

Stop / Cancel

less

NN-CT878S

Power source 240V AC Single Phase 50Hz

Power requirements Microwave 1220W

Grill 1560W

Convection 1350W

Combi 2870W

Output (IEC60705) Microwave 1000W

Grill 1500W

Convection 1250W

Microwave frequency 2450Mhz

Timer 99 min 99 second

Oven cavity size 32L

Outside dimensions 530mm(W) x 508mm(D) X 344MM (H)

Inside dimensions 350mm(W) X 360mm(D) x 250mm(H)

Weight 21Kg

Unauthorized copying and distribution is a violation of law.

NN-CT878SBPQ

1 Contents

1 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2 Inverter Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3 Feature Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

4 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

5 Operation And Digital Programmer Circuit Test Procedure . . . . . . . . . . . . . . . . . . . 5

6 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

7 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

8 Description of the Operation Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

9 Cautions to be Observed when Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

10 Part Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

11 Component Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

12 Measurements and Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

13 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

14 Description of Operating instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

15 Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

16 Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

17 Door Assy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

18 Escutcheon Base. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

19 Packing and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

20 Trim Kit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

21 Digital Programmer Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

22 Key Board Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

NN-CT878SBPQ

2 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 without a proper ground connection.

Inverter Grounding

Figure 1

Inverter PCB layout

Figure 2

3 Feature Chart

Function BPQ

Microwave 6

Grill 3

Convection 17

Combi Yes

Sensor Reheat -

Sensor Cook 5

Sensor Combi 11

Auto Preheat Combi -

Weight Defrost 3

Weight Combi 2

Weight Reheat -

Weight Cook -

Memory Cook 3

Weight Crisp -

Stage Cooking 3 stage

Delay / Stand Yes

More / Less Yes

Kg -> lb/oz Yes

Clock 12h

Word Prompt English

Step by Step LED

NN-CT878SBPQ

4 Control Panel

NN-CT878SBPQ

5 Operation And Digital Programmer Circuit Test Procedure

NN-CT878SBPQ

6 Schematic Diagram

NN-CT878SBPQ

7 Wiring Diagram

Wiring Harness

NN-CT878SBPQ

8 Description of Operating instruction

8.1. 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 from 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

8.2. 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

8.3. 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.

Defrost Menu’s

Weight Menu’s

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 66” 0”

Grill 2 54” 12”

Grill 3 42” 24”

Category 1st Touch Weight Cooking Time

Turbo Defrost 500g 8m 20s

Category 1st Touch Weight Cooking Time

1. Whole Chicken 1000g 23m 54s

2. Chicken Pieces 500g 14m 40s

3. Beef 900g 26m 59s

4. Lamb 1200g 30m 06s

5 Pork 1200g 35 m 00s

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