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. Turbo defrost, Auto cook
6
2.4. Sensor cooking
6
2.5. Steam sensor and digital programmer circuit
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 10A fuse is blown due to the malfunction of the
short 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
13
4.7. Steam sensor
13
4.8. Inverter power supply
14
5 COMPONENT TEST PROCEDURE
15
5.1. Primary, Secondary Latch Switch interlocks & Power
Relay RY1
15
5.2. Short Switch
15
5.3. Magnetron
15
5.4. key board membrane (Membrane switch assembly)
15
5.5. Inverter power supply (U)
16
5.6. Temperature thermistor
16
6 MEASUREMENTS AND ADJUSTMENTS
17
6.1. Adjustment of primary latch switch, secondary latch switch
and short switch.
17
6.2. Measurement of microwave output
17
7 TROUBLESHOOTING GUIDE
18
7.1. (Troubleshooting) Oven stops operation during cooking
18
7.2. (Troubleshooting) Other problems
19
7.3. Troubleshooting of inverter circuit (U) and magnetron
20
7.4. Simple way of H.V. Inverter/magnetron troubleshooting
21
7.5. How to check the semiconductors using an OHM meter
21
7.6. H.V. INVERTER MAIN PARTS LIST (Z606YBA00QP)
22
8 EXPLODED VIEW AND PARTS LIST
23
8.1. EXPLODED VIEW
23
8.2. PARTS LIST
24
8.3. ESCUTCHEON BASE ASSEMBLY
25
8.4. DOOR ASSEMBLY
27
8.5. WIRING MATERIALS
28
8.6. PACKING AND ACCESSORIES
29
9 DIGITAL PROGRAMMER CIRCUIT
30
9.1. SCHEMATIC DIAGRAM (NN-SD452W)
30
9.2. SCHEMATIC DIAGRAM (NN-ST462M, ST452W)
32
CONTENTS
Page Page
4
NN-SD452W / NN-ST462M / NN-ST452W