Microwave Circuit Theory Of Operation - TurboChef NGC (Tornado) Service Manual

22 THE MICROWAVE SYSTEM
TRANSFORMER OUTPUT VOLTAGE
+(B)
0
(A)
+
-
ON POSITIVE VOLTAGE SWING
        : Microwave Circuit Theory of Operation

MICROWAVE CIRCUIT THEORY OF OPERATION

Figure 14
1. The High Voltage Transformer steps up the
input voltage to approximately 2400 volts peak
(4800 volts peak to peak).
2. The High Voltage Capacitor charges to 2400
volts on the positive going voltage via the High
Voltage Diode's conduction.
3. The High Voltage Transformer plus the charged
High Voltage Capacitor supply down to -4800
volts to the Magnetron when the voltage goes
negative. (High Voltage Diode is back biased.)
4. The Magnetron converts negative input voltage
(and current) to RF energy at 2450 MHz.
      : Do not attempt to measure
these voltages.
+2400 V
-2400 V
-(C)
2400
VDC
+ -
2400
Current
Flow
CAPACITOR CHARGES
MAGNETRON VOLTAGE
+(B)
0
(A)
2400
VDC
- +
2400
Current
Flow
+
CHARGED CAPACITOR PLUS TRANSFORMER
ON NEGATIVE VOLATAGE SWING
MICROWAVE SYSTEM PARTS
Figure 15
11. 102101 High Voltage Transformer 2
12. 102101 High Voltage Transformer 1
13. 100201 High Voltage Capacitor 2
14. 100201 High Voltage Capacitor 1
15. 100481 High Voltage Diode 2
16. 100481 High Voltage Diode 1
17. 102102 Filament Transformer 2
18. 100083 Mag Cooling Fan
19. 101271 K3 Monitor Relay
20. 101271 K2 High Voltage Relay
21. 101271 K1 Filament Relay
22. 102102 Filament Transformer
23. 100599 F3 Fuse - 20 Amp
24. 102070 Mag 2 Thermostat
25. 100861 Magnetron 2
26. NGC-1106 Wave Guide #2
27. 102070 Mag 1 Thermostat
28. 100861 Magnetron 1
29. NGC-1044 Wave Guide #1
-4800 V
-(C)
-
4800
VDC