High Voltage And Filament Transformer Resistance Table - TurboChef NGC (Tornado) Service Manual

7. If there is infinite resistance in both direction:
open Diode.
8. Due to the High Voltage Diode consisting of
approximately 15 x 1000 volt Diodes in series,
the forward Diode drop is approximately 9 volts.
A normal low voltage Ohmmeter will not pro-
vide sufficient voltage in the resistance ranges to
measure an impedance in the forward direction
of the High Voltage Diode.
How to check a Capacitor
1. Disconnect the oven from the power source.
2. Isolate the Capacitor from the circuit.
3. Fully discharge the Capacitor.
4. Connect the Ohmmeter between the Capacitor
Terminals. The Ohmmeter should momentarily
indicate a low impedance and then slowly return
to infinite resistance.
5. Reverse the Ohmmeter leads and repeat Step 4.
6. Check each terminal to case. Infinite resistance
(open) should be indicated.
HIGH VOLTAGE AND FIL AMENT TRANSFORMER RESISTANCE TABLE
DESCRIPTION
High Voltage Transformer
Filament Transformer
P/N
PRIMARY 208
TAPS ( 1 & 2) (
102101 0.882–1.08
102102 19.17–23.43
How to check a Magnetron for Open/Shorted Filament
1. Disconnect the AC power source and discharge
the High Voltage Capacitors.
2. Isolate the Magnetron from the circuit by removing
the wires from the F and FA terminals. Figure 22.
3. An Ohmmeter connected between the Filament
Terminals (F, FA) should indicate a reading of
less than 1 Ohm. Figure 22.
4. A continuity check between either Filament
Terminal and the Magnetron Chassis should
indicate an infinite resistance (open).
How to check a High Voltage or Filament Transformer
1. Disconnect all the wires in question going to
the Transformer.
2. Use an Ohmmeter to check the impedance of
the Primary and Secondary Winding. Refer to
the High Voltage and Filament Transformer able
below to determine if the transformer is OK. If
the resistance is different then the table indicates,
replace the Transformer.
PRIMARY 240
) TAPS ( 1 & 3) ( )
1.06–1.29
22.41–27.39
THE MICROWAVE SYSTEM
SECONDARY
TAPS (4 & GROUND) (
53.64–65.56
0.088–0.108
29
)