Continuity checks can only indicate an open filament or a shorted magnetron. To diagnose an
open filament or shorted magnetron.
1. Isolate the magnetron from the circuit by disconnecting the HV
leads
2. A continuity check across the magnetron filament terminals
should indicate one ohm or less
3. A continuity check between each filament terminal and the
magnetron case should read open.
10.4. Push Button Keyboard
Check the continuity between the switch terminals, by tapping an appropriate pad on the
keyboard. The keypad matrix is shown on
Key Board Matrix
.
10.5. Inverter Power Supply
Caution
DO NOT try to repair this inverter power supply). Replace as a
whole H.V. Inverter Unit.
Inverter Power Supply Diagram
38
Summary of Contents for NN-A720MB
Page 16: ...16 ...
Page 17: ...6 Wiring Diagram 17 ...
Page 23: ...Convection And Microwave Duty Cycles Figure 2 Grill and Microwave Duty Cycles Figure 3 23 ...
Page 45: ...Figure 2 How to test the semiconductors 14 Main Parts List 45 ...
Page 49: ...49 ...
Page 50: ...50 ...
Page 51: ...16 Door Assembly 51 ...
Page 52: ...52 ...
Page 53: ...53 ...
Page 55: ...55 ...
Page 56: ...56 ...
Page 58: ...58 ...
Page 61: ...DPC Schematic 1 61 ...
Page 62: ...62 ...
