1 FEATURE CHART 5
2 CONTROL PANEL
5
3 SCHEMATIC DIAGRAM
6
4 DESCRIPTION OF OPERATING SEQUENCE
7
4.1. Variable power cooking control
7
4.2. Inverter power supply circuit
7
4.3. Auto Weight cooking
7
4.4. Grill cooking control
7
4.5. Combination cooking control
7
5 CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING
8
5.1. Check the grounding
8
5.2. Inverter warnings
8
5.3. Part replacement
9
5.4. When the 15A fuse is blown due to the malfunction of the
short switch
9
5.5. Avoid inserting nails, wire etc. through any holes in the
unit during operation
9
5.6. Verification after repair
9
5.7. Sharp edges
9
6 DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE
10
6.1. Magnetron
10
6.2. Digital programmer circuit (D.P.C) AU, (D.P.C.) DU,
membrane sheet, low voltage transfarmer and power relay
11
6.3. H.V. Inverter
12
6.4. Fan motor
13
6.5. Upper heaters
14
6.6. Door assembly
14
6.7. Stirrer motor
15
7 COMPONENT TEST PROCEDURE
16
7.1. Primary, Secondary Latch Switch interlocks & Power
Relay RY1
16
7.2. Short Switch
16
7.3. Magnetron
16
7.4. Inverter power supply (U)
17
7.5. Temperature thermistor
17
8 MEASUREMENTS AND ADJUSTMENTS
18
8.1. Adjustment of Primary latch switch, Secondary latch
switch and Short switch.
18
8.2. Measurement of microwave output
18
9 TROUBLESHOOTING GUIDE
19
9.1. (Troubleshooting) Oven stops operation during cooking
20
9.2. (Troubleshooting) Other problems
21
9.3. Troubleshooting of inverter circuit (U) and magnetron
22
9.4. Trouble related to Digital Programmer Circuit
23
9.5. SIMPLE WAY OF H.V. INVERTER/MAGNETRON
TROUBLESHOOTING
23
9.6. How to check the semiconductors using an OHM meter
24
9.7. H.V. INVERTER MAIN PARTS LIST (Z606Y6Y40BP)
24
10 EXPLODED VIEW AND PARTS LIST
25
10.1. EXPLODED VIEW
25
10.2. PARTS LIST
26
10.3. ESCUTCHEON BASE ASSEMBLY
28
10.4. DOOR ASSEMBLY
29
10.5. WIRING MATERIALS
30
10.6. PACKING AND ACCESSORIES
31
11 DIGITAL PROGRAMMER CIRCUIT
32
11.1. SCHEMATIC DIAGRAM
32
CONTENTS
Page Page
4
NN-GF668M
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