1 SCHEMATIC DIAGRAM
5
2 DESCRIPTION OF OPERATING SEQUENCE
6
2.1.
Variable power cooking control
6
2.2.
Inverter power supply circuit
6
2.3.
Inverter defrost
6
2.4.
Sensor cooking (Only for sensor models)
6
2.5.
Sensor reheat (Only for sensor models)
7
2.6.
Steam sensor and digital programmer circuit (Only for
sensor models)
7
2.7.
Thermistor
7
3 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 8
3.1.
Check the grounding
8
3.2.
Inverter warnings
8
3.3.
Part replacement.
9
3.4.
When the 20A fuse is blown due to the malfunction of the
monitor interlock switch:
9
3.5.
Avoid inserting nails, wire etc. through any holes in the
unit during operation.
9
3.6.
Verification after repair
9
3.7.
Sharp edges
9
4 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 10
4.1.
Magnetron
10
4.2.
Digital programmer circuit (D.P.C)
10
4.3.
Low voltage transformer and/or power relays (RY1, RY2)
11
4.4.
Fan motor
11
4.5.
Door assembly
11
4.6.
Turntable motor
12
4.7.
Steam sensor (Only for sensor models)
12
4.8.
Inverter power supply
13
5 COMPONENT TEST PROCEDURE
14
5.1.
Primary, Secondary Latch Switch interlocks & Power
Relay RY1
14
5.2.
Monitor Interlock Switch
14
5.3.
Magnetron
14
5.4.
key board membrane (Membrane switch assembly)
14
5.5.
Inverter power supply (U)
15
5.6.
Temperature thermistor
15
6 MEASUREMENTS AND ADJUSTMENTS
16
6.1.
Adjustment of primary latch switch, secondary latch switch
and monitor interlock switch.
16
6.2.
Measurement of microwave output
16
7 PROCEDURE FOR MEASURING MICROWAVE ENERGY
LEAKAGE
17
7.1.
Equipment
17
7.2.
Procedure for measuring radiation leakage
17
7.3.
Record keeping and notification after measurement
17
7.4.
At least once a year, have the radiation monitor checked
for calibration by its manufacturer.
18
8 TROUBLESHOOTING GUIDE
19
8.1.
(Troubleshooting) Oven stops operation during cooking 19
8.2.
(Troubleshooting) Other problems
20
8.3.
Troubleshooting of inverter circuit (U) and magnetron 21
8.4.
SIMPLE WAY OF H.V. INVERTER/MAGNETRON
TROUBLESHOOTING
22
8.5.
H.V.INVERTER BOARD MAIN PARTS LIST
(F606Y8M00AP)
22
8.6.
How to check the semiconductors using an OHM meter
23
9 EXPLODED VIEW AND PARTS LIST
24
9.1.
EXPLODED VIEW
24
9.2.
PARTS LIST
25
9.3.
ESCUTCHEON BASE ASSEMBLY
27
9.4.
DOOR ASSEMBLY
30
9.5.
WIRING MATERIALS
31
9.6.
PACKING AND ACCESSORIES
32
10 DIGITAL PROGRAMMER CIRCUIT
33
10.1. NN-SD778S
33
10.2. NN-ST778S
35
10.3. NN-SA768W
37
10.4. PARTS LIST
39
CONTENTS
Page
Page
4
NN-SD798S / NN-ST778S / NN-SA768W
Summary of Contents for NN-SA768W
Page 2: ...2 NN SD798S NN ST778S NN SA768W ...
Page 3: ...3 NN SD798S NN ST778S NN SA768W ...
Page 5: ...1 SCHEMATIC DIAGRAM 5 NN SD798S NN ST778S NN SA768W ...
Page 23: ...8 6 How to check the semiconductors using an OHM meter 23 NN SD798S NN ST778S NN SA768W ...
Page 24: ...9 EXPLODED VIEW AND PARTS LIST 9 1 EXPLODED VIEW 24 NN SD798S NN ST778S NN SA768W ...
Page 33: ...10 DIGITAL PROGRAMMER CIRCUIT 10 1 NN SD778S 33 NN SD798S NN ST778S NN SA768W ...
Page 34: ...34 NN SD798S NN ST778S NN SA768W ...
Page 35: ...10 2 NN ST778S 35 NN SD798S NN ST778S NN SA768W ...
Page 36: ...36 NN SD798S NN ST778S NN SA768W ...
Page 37: ...10 3 NN SA768W 37 NN SD798S NN ST778S NN SA768W ...
