Filter
Top Products
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
6
2.5. Sensor reheat
7
2.6. Steam sensor and digital programmer circuit
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
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. WIRING MATERIALS
27
9.4. DOOR ASSEMBLY
28
9.5. ESCUTCHEON BASE ASSEMBLY
29
9.6. PACKING AND ACCESSORIES
32
10 DIGITAL PROGRAMMER CIRCUIT
33
10.1. NN-SD698S
33
10.2. NN-ST678S
35
10.3. NN-ST658W
37
10.4. PARTS LIST
39
CONTENTS
Page Page
4
NN-SD698S / NN-ST678S / NN-ST658W