Panasonic NN-L750WB User manual

Table Of Contents
COVER
1 Inverter Warning
2 Feature Chart
3 Control Panels
4 Operation And Digital Programmer Circuit Test Procedure
4.1 Word Prompting
4.2 Setting the Clock
4.3 Child Safety Lock
4.4 Microwave Cooking and Defrost
4.5 Grill Operation
4.6 Convection with Preheating
4.7 Convection without Preheating
4.8 Combination Cooking (Grill and Microwave)
4.9 Combination Cooking (Convection and Microwave)
4.10 Combination Cooking (Convection and Grill)
4.11 Combination Cooking (Convection, Grill and Microwave)
4.12 Auto Defrost
4.13 Auto Weight Programs
4.14 Auto Weight Program Panacrunch (NN-L760WB)

5 Schematic Diagram
6 Wiring Diagram
7 Description of Operating instruction
7.1 Variable power cooking control
7.2 Grill Cooking
7.3 Auto weight defrost, Auto weight Cook
7.4 Convection Cooking
7.5 Combination Cooking
8 Cautions to Be Observed When Troubleshooting
8.1 Check the grounding
8.2 Inverter Warnings
8.3 When parts must be replaced, remove the power plug from the outlet.
8.4 When the 10A fuse is blown due to the operation of the short switch:
8.5 Avoid inserting nails, wire etc. through any holes in the unit during operation.
8.6 Confirm after repair
8.7 Sharp Edges
9 Parts Replacement Procedure
9.1 Magnetron
9.2 Inverter power supply (U)
9.3 Digital Programmer Circuit (DPC)
9.4 Low voltage transformer and/or power relays (RY1)

9.5 Fan Motor
9.6 Door disassembly
9.7 Turntable Motor
9.8 Quartz Heater
9.9 Convection Element And Circulation Fan Motor
9.10 Temperature Sensor
10 Component Test Procedure
10.1 Primary Latch Switch, Secondary Latch Switch and power relay B interlocks.
10.2 Short Switch and Monitor Circuit
10.3 Magnetron
10.4 Push Button Keyboard
10.5 Inverter Power Supply
10.6 Inverter Power Supply Unit
10.7 Temperature Sensor
11 Measurements and Adjustments
11.1 Installation of primary latch switch, secondary latch switch and short switch.
11.2 Measurement of microwave output
12 Troubleshooting guide
13 Digital Programmer Circuit Troubleshooting Guide
14 Main Parts List

15 Exploded View
16 Door Assembly
17 Escutcheon Base
18 Packing And Accessories
19 Trim Kit Accessories
20 Noise filter component parts
21 Digital programmer Circuit
22 Key Board Matrix
23 Digital programmer circuit parts list
23.1 J603L4V10EP/10UP/40EP/40UP DPC AU
23.2 J603Y4V00BP DPC DU

Service Manual
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Order Number MOP00100019C2
Microwave Oven
●NN-L750WB/NN-L760WB
27L
WHITE
EPG Continental Europe
UPG France

© 2000 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
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1 Inverter Warning
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The inverter board looks like a regular PCB, however, this PCB drives the magnetron tube using very
high voltages and current.
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 voltages. 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.
Figure 1
Inverter Power Supply Diagram
Figure 2

Inverter Layout
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2 Feature Chart
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NN-750WB NN-750WB NN-760WB NN-760WB
Function EPG UPG EPG UPG
Microwave 4 4 4 4
Grill 1 1 1 1
Convection 17 17 17 17
Combination Yes Yes Yes Yes
Weight Defrost 2 2 2 2
Weight Combination 8 8 5 5
Weight Reheat 1 1 - -
Weight Cook 2 2 2 2
Weight Crisp - - 5 5
Stage Cooking 1 Stage 1 Stage 1 Stage 1 Stage
Delay / Stand Yes Yes Yes Yes
Clock 24 Hour 24 Hour 24 Hour 24 Hour
Word Prompt *1 French *1 French
*1 None, Italian, Spanish, Dutch, French, Greek, Portuguese, Polish, English
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3 Control Panels
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4 Operation And Digital Programmer Circuit
Test Procedure
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4.1 Word Prompting
4.2 Setting the Clock
4.3 Child Safety Lock
4.4 Microwave Cooking and Defrost
4.5 Grill Operation
4.6 Convection with Preheating
4.7 Convection without Preheating
4.8 Combination Cooking (Grill and Microwave)
4.9 Combination Cooking (Convection and Microwave)
4.10 Combination Cooking (Convection and Grill)
4.11 Combination Cooking (Convection, Grill and Microwave)
4.12 Auto Defrost
4.13 Auto Weight Programs
4.14 Auto Weight Program Panacrunch (NN-L760WB)
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4.1 Word Prompting
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4.2 Setting the Clock
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4.3 Child Safety Lock
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4.4 Microwave Cooking and Defrost
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4.5 Grill Operation
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4.6 Convection with Preheating
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4.7 Convection without Preheating
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4.8 Combination Cooking (Grill and Microwave)
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4.9 Combination Cooking (Convection and Microwave)
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