Panasonic NN-H264SFR, Service Manual

Page: 33 / 83

Microwave Oven 1
1. FEATURE CHART 5
2. CONTROL PANEL (APH) 6
3. CONTROL PANEL (CPH) 7
4. OPERATION AND DIGITAL PROGRAMMER CIRCUIT TEST PROCEDURE 8
4.1. To set clock 8
4.2. Time cooking for two stage 9
4.3. Inverter turbo defrost 10
4.4. Inverter auto cooking 10
4.5. Popcorn 11
4.6. Auto reheat 11
4.7. Power level 12
5. SCHEMATIC DIAGRAM (APH) 12
6. SCHEMATIC DIAGRAM (CPH) 13
7. DESCRIPTION OF OPERATING SEQUENCE 14
7.1. Variable power cooking control 14
Variable Power Cooking 14
7.2. Inverter power supply circuit [NEW H.V.] 15
7.3. Inverter turbo defrost 15
Inverter Turbo Defrost 16
8. CAUTIONS TO BE OBSERVED WHEN TROUBLESHOOTING 16
8.1. Check the grounding 16
8.2. Inverter warnings [NEW H.V.] 16
8.3. When parts must be replaced, remove the power plug from the outlet. 18
8.4. When the 18 Amp fuse is blown due to the operation of short switch: 18
8.5. Avoid inserting nails, wire, etc. through any holes in the unit during operation. 18
8.6. Confirm after repair 19
9. DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE 20
9.1. Magnetron 20
9.2. Digital programmer circuit (DPC) and membrane key board. 20
9.3. Low voltage transformer and/or power relays (RY1, RY2) 21
9.4. Inverter power supply (U) 22
9.5. Door assembly 24
9.6. Stirrer motor 25
9.7. Blower motor (U) 25
9.8. Fan motor A (for H.V. inverter (U) cooling) 25
9.9. Fan motor B (for magnetron cooling) 26
9.10. Turntable motor 26
10. COMPONENT TEST PROCEDURE 27
10.1. Primary latch switch, secondary (secondary latch switch and power relay B) interlocks. 27
10.2. Short switch & monitor 27
10.3. Magnetron 28
10.4. Membrane key board (Membrane switch assembly) 28
10.5. Inverter power supply (U) 28
11. MEASUREMENTS AND ADJUSTMENTS 30
11.1. Adjustment of primary latch switch, secondary latch switch and short switch. 30
11.2. Measurement of microwave output 31
TABLE (1L-1min.test) 31
12. PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE 32
12.1. Equipment 32
12.2. Procedure for measuring radiation leakage 32
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