Turbochef-technologies TurboChef User Manual Page 43
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THE MICROWAVE SYSTEM
33
HIGH VOLTAGE TRANSFORMERS PRIMARY VOLTAGE, FREQ, TAPS,
AND RESISTANCE
SECONDARY TAPS AND
RESISTANCE
NGC-3062-1 208 VAC, 60 Hz, 1 & 2,
0.819–1.001
W
240 VAC, 60 Hz, 1 & 3,
0.972–1.188
W
4, Ground, 53.60–65.52
W
NGC-3062-2 230 VAC, 50 Hz, 1 & 2,
0.972–1.188
W
3, Ground, 57.52–70.30
W
NGC-3062-3 200 VAC, 50/60 Hz, 1 & 2,
0.784–0.958
W
3, Ground, 55.75–68.13
W
FILAMENT TRANSFORMERS PRIMARY VOLTAGE, FREQ, TAPS,
AND RESISTANCE
SECONDARY TAPS AND
RESISTANCE
NGC-3061-1 208 VAC, 60 Hz, 1 & 2,
17.49–21.37
W
240 VAC, 60 Hz, 1 & 3,
20.61–25.19
W
4, 5, very low resistance - if read-
ing is open, transformer has failed.
NGC-3061-2 230 VAC, 50 Hz, 1 & 2,
18.99–23.21
W
3, 4, very low resistance - if read-
ing is open, transformer has failed.
NGC-3061-3 200 VAC, 50/60 Hz, 1 & 2,
15.70–19.18
W
3, 4, very low resistance - if read-
ing is open, transformer has failed.
HIGH VOLTAGE AND FILAMENT TRANSFORMER RESISTANCE TABLE
How to Check a Capacitor
1. Disconnect the oven from the power source.
2. Fully discharge the capacitor.
3. Isolate the capacitor from the circuit.
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.
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 25.
3. An ohmmeter connected between the filament
terminals (F, FA) should indicate a reading of
less than 1 ohm. Figure 25.
4. A continuity check between either filament
terminal and the magnetron chassis should indi-
cate an infinite resistance (open).
How to Check a High-Voltage or Filament Transformer
1. Disconnect the AC power source and discharge
the high-voltage capacitors.
2. Disconnect all the wires in question going to
the transformer.
3. Use an ohmmeter to check the impedance of the
primary and secondary winding. Refer to the
high-voltage and filament transformer table below
to determine if the transformer is OK. If the
resistance is different then the table indicates,
replace the transformer.
- 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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