- 12 -
5. Alignment and Adjustments
PRECAUTION
1. High voltage is present at the high voltage terminals during any cook cycle.
2. It is neither necessary nor advisable to attempt measurement of the high voltage.
3. Before touching any oven components or wiring, always unplug the oven from its power source and
discharge the high voltage capacitor.
5-1 High Voltage Transformer
1. Remove connectors from the transformer terminals and
check continuity.
2. Normal resistance readings are as follows:
Secondary
Approx. 165.0 Ω
Filament
Approx. 0Ω
Primary
Approx. 2.4 Ω
(Room temperature = 20°C)
5-2 Low Voltage Transformer
1. The low voltage transformer is located on the control circuit board.
2. Remove the low voltage transformer from the PCB Ass’y and check continuity.
3. Normal resistor reading is shown in the table.
Terminals
Resistance
1~2 (Input)
1250
Ω
3~4 (Output7V)
17.4
Ω
5~6 (Output17V)
3.53
Ω
5-3 Magnetron
1. Continuity checks can indicate only an open filament or a
shorted magnetron. To diagnose an open filament or shorted
magnetron.
2. Isolate the magnetron from the circuit by disconnecting its
leads.
3. A continuity check across the magnetron filament terminals
should indicate one ohm or less.
4. A continuity check between each filament terminal and
magnetron case should read open.
Filament Terminals
Primary
Terminals
Secondary
Terminal
Cooling Fins
Magnetron Antenna
Gasket Plate
