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THE MICROWAVE SYSTEM
25
The Microwave System is the most complex system in
the oven. Proper care must be taken during servicing
to protect both the operator and technician.
VOLTAGE DOUBLER CIRCUIT DESCRIPTION
The Microwave System consists of a magnetron
and Voltage Doubler Circuit. The Voltage Doubler
Circuit consists of a special step-up transformer, a
capacitor, and a diode.
MONITOR CIRCUIT DESCRIPTION
In addition to understanding the Voltage
Doubler Circuit, it is imperative to understand
how the Monitor Circuit operates. The Monitor
Circuit is a failsafe circuit designed to protect the
operator if both the primary and secondary inter-
lock switches fail to operate normally.
The Monitor Circuit consists of the primary and
secondary interlock switch, monitor safety switch,
monitor relay, and the F3 fuse. When the oven
door closes during normal operation, the monitor,
secondary, and primary switches close in the order
listed above. When all switches are closed, the
Microwave System is allowed to operate.
If during normal operation any of the interlock
switches open - such as when the oven door opens
- the control will turn off the microwave. If the
monitor switch opens before the primary or sec-
ondary switches (abnormal operation), the monitor
switch de-energizes the monitor relay. When this
occurs, a dead short is placed across L1 and L2.
The short then blows the F3 fuse, which perma-
nently interrupts power to the Microwave System
until all switches are repaired and/or functioning
properly.
Figure 18 shows a schematic of the Monitor
Circuit. Make sure to note the following:
Primary and secondary switches interlock the
high-voltage control signal. (K2 relay)
Normal operation: When the K2 and K3 relays
energize, power is supplied to the high-voltage
transformers.
Abnormal operation: When K2 is energized
and K3 is un-energized (via an opening of the
monitor switch), L1 and L2 short to blow the
F3 fuse and failsafe.
Figure 19 on the following page details the theory
of operation of the Voltage Doubler Circuit.
7
9
A
B
1
4
3
6
1
2
1
2
CDP
NC
NO
7
9
A
B
1
4
3
6
+24 VDC
F3 FUSE
20 AMP
(BLOWN)
+24 VDC
LINE VOLTAGE
(L1)
LINE VOLTAGE
(L2)
K2 HV
RELAY
T1
HV TRANSFORMER
3
3
T2
HV TRANSFORMER
MONITOR SWITCH
(OPEN)
K3 MONITOR
RELAY
CONTROL
CDM
CONTROL
CDS
CONTROL
C
NC
NO
C
NC
NO
C
PRIMARY AND SECONDARY
INTERLOCKS (CLOSED)
FIGURE 18: Monitor Circuit - shown in failsafe state.
- TurboChef Service Manual 1
- For further information call: 2
- +1 214.379.6000 2
- NEVER attempt to 3
- Table of Contents 4
- IMPORTANT SAFETY INSTRUCTIONS 7
- GENERAL SAFETY INFORMATION 7
- REDUCING FIRE RISK 7
- EXCESSIVE MICROWAVE ENERGY 8
- GROUNDING INSTRUCTIONS 8
- POWER CORD REPLACEMENT 8
- 1 year parts and labor 10
- VAC, 60 Hz, 1 phase 10
- 4” (102 mm) adjustable legs 10
- 304 stainless steel line 10
- POWER INPUT 11
- TURBO / +1 214.379.6000 13
- 1 2 3 4 5 14
- Theory of Operation 15
- THEORY OF OPERATION 16
- CONTROL SYSTEM 16
- MICROWAVE SYSTEM 16
- CONVECTION SYSTEM 16
- BOTTOM IR AND CCV 16
- Fault Codes 19
- TO VIEW FAULT CODES 20
- FAULT CODE DEFINITIONS 20
- FAULT CODES 21
- The Control System 22
- CONTROL 23
- TEST MODE 24
- TEST FUNCTION OPTIONS 25
- W) status indicator is not 26
- DIAGNOSTIC MODE 26
- (CCSP) 26
- THE CONTROL SYSTEM 27
- FIGURE 15: Done Screen 28
- CONTROL SYSTEM PANEL PARTS 30
- ISSUE RESOLUTION 31
- 800.90TURBO 33
- The Microwave System 34
- MONITOR CIRCUIT DESCRIPTION 35
- MICROWAVE SYSTEM PARTS 36
- THE MICROWAVE SYSTEM 37
- MICROWAVE SYSTEM COMPONENTS 38
- WAVE GUIDE COVER REPLACEMENT 39
- WAVE GUIDE REPLACEMENT 40
- REPLACEMENT 40
- FIGURE 24: High Voltage Diode 42
- FIGURE 25: Magnetron 42
- The Oven Door 47
- OVEN DOOR PARTS 48
- ADJUSTING THE OVEN DOOR 49
- ADJUSTMENTS AND PARTS 50
- MONITOR SAFETY SWITCH PARTS 51
- = 0.020” 51
- Old Switch Setup 52
- New Switch Setup 53
- FIGURE 35: Oven Door Assembly 55
- PART TORQUE 56
- SCREW TORQUE CHART 56
- The Convection Circuit 58
- CONVECTION CIRCUIT COMPONENTS 59
- THE CONVECTION CIRCUIT 60
- IR Element and Catalytic 63
- Converter 63
- COMPONENTS 64
- Schematics and Schematic 66
- Components 66
- SCHEMATIC PARTS 67
- TEST POINT LOCATIONS 67
- I/O BOARD SCHEMATIC 68
- 41: NGC (Tornado) Schematic 69
- NGC (UK) SCHEMATIC 70
- 43: NGCEW (Tornado) Schematic 71
- 44: NGCED (Tornado) Schematic 72
- NGC (BRAZIL) SCHEMATIC 73
- Service Parts and 74
- Illustrations 74
- FILAMENT AND 79
- HIGH VOLTAGE 79
- TERMINALS 79
- APPLY HI-TEMP 81
- GREASE TO AREA 81
- FIGURE 35: OVEN DOOR ASSEMBLY 83
- TURBO or +1 214-379-6000 85
- Comprehensive Part List 89
- ITEM DESCRIPTION 90
- +1 214-379-6000 94
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