Turbo Chef Technologies NGC-1007 service manual Chapter

Page 16

THEORY OF OPERATION

The TurboChef NGC (Tornado) oven utilizes three independent heat transfer mechanisms to rapidly cook food.

The systems are as follows:

Convection

Infrared energy

Microwave energy

By combining these mechanisms along with the ability to control each mechanism independently, the NGC (Tornado) oven is able to reduce the cook time of most foods by 70-90 percent.

Figure 5 below represents the oven’s different sys- tems and the critical components of each system.

THEORY OF OPERATION

7

Should a problem arise with any of the compo- nents listed below, please turn to the appropriate section within this manual for further instructions.

For the purpose of this manual, each independent heat transfer mechanism is individually identified. For instance, if an oven is experiencing difficulties browning the food, focus on CONVECTION SYSTEM

and/or BOTTOM IR AND CCV. Focus on MICROWAVE

SYSTEM if the oven is browning the food but not heating the inside.

Part numbers are included on illustrations (where applicable) and in the back of this manual. If an item is not illustrated, the part number is provided in the text.

Chapter 4	Chapter 5	Chapter 7	Chapter 8
CONTROL SYSTEM	MICROWAVE SYSTEM	CONVECTION SYSTEM	BOTTOM IR AND CCV
I/O Control Board	Magnetrons	Convection Heater	Bottom Infrared Element
Keypad	High Voltage Transformers	Blower Controller	Catalytic Converter
Display	Filament Transformers	Blower Motor
Mechanical Relays	High Voltage Capacitors	Hi-Limit Thermostat
Solid State Relay	High Voltage Diodes
	Fuses

F I G U R E 5: NGC (Tornado) Systems and Critical Components

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Contents Accelerating the World of Cooking For further information call Important Safety Information Please Read First Table of Contents Microwave System Oven DoorSchematics and Schematic Components Service Parts and IllustrationsConvection Circuit IR Element and Catalytic ConverterImportant Safety Instructions Grounding Instructions Installation, Specifications, and Maintenance Dimensions Standard FeaturesPower Supply North America ConstructionPower Supply Europe, Asia-Pacific Power Supply Latin AmericaPower Supply South Korea Built-In Installation FigureInstallation Near Open Heat Source Figure Setup Initial Power-up Oven Restraint Kit TC3-0242 KIT StackingRemove the Lower Access Panel Remove and Clean the Cooking SurfaceClean Oven Interior Clean Lower Access Panel AreaTheory of Operation Chapter Set Temperature, Cook Cavity Ccsp Set Temperature, IR Element Irsp and IrsiActual Temperature, Cook Cavity TCC Actual Temperature, IR Element TIRFault Code KeypadDisplay Self-Test StestFault Codes F2 Cook Temperature Low F1 Blower Running Status BadF3 Magnetron Current Low F4 Door Monitor DefectiveF5 Magnetron Over Temperature Thermocouple temperature is below the indicated limitF7 Thermocouple Open F8 Heat LowControl System Mech VDC Power Supply Interlock SwitchesK1 Mechanical Relay K2 Mechanical RelayFaults Screen Blower Speed ScreenSelf-Test Function Screen Heater Test ScreenDiagnostic Display Screen Electronic Compartment Temperature ScreenChanging the Cook Chamber Temperature Cooks ScreenAltering a Recipe Snooze Mode Loading a Menu from a Smart CardDone Screen Time ScreenFunction/Screen Enter Key CodeSmart Card Reader Cable Reference page 54 for a schematic of the I/O control board Board J3 connector Replace I/O control boardPin connector If not, correct the voltage supplyVAC is going to the motor controller via pins 2 TroubleshootingRefer to page 50 for motor controller troubleshooting Detailed troubleshootingIf high-limit is not tripped, follow the instructions below Microwave System Voltage Doubler Circuit Description Microwave System Filament and High Voltage Terminals ORG Magnetron High-Voltage TransformersFilament Transformers F3 FuseWave Guide Cover Replacement Wiring the High-Voltage Transformers NGC-3036Kit, Wave Guide Cover Includes Item 31 and sealantScrews, #8, SST NGC-1047Support, Frame Remove the wave guide cover. See Wave GuideWiring the Filament Transformers Procedure for Measuring RF LeakageTesting the High-Voltage Diode How to Check a DiodeHow to Check a Capacitor How to Check a High-Voltage or Filament TransformerMagnetron ComponentsRemove the top and right side covers Back and Enter keys, enter the code 9-4-2-8 and press EnterHV capacitor shorted or failing follow troubleshooting on Voltage TransformersMgtron soft key. Voltage present should be 200 +/- 10% Unplug the oven and replace relay if necessaryTroubleshooting see F4 Monitor Primary and secondary, the control would have recordedOccurrence. See page 25 as well as Oven Door for Energizing the Microwave SystemOven Door Oven Door 31 for proper procedure Critical Adjustment NotesOven Burn-In Procedure Primary and Secondary Interlock Switch Adjustments and Parts Assembly Notes PPHD, Cres5963 Adjusting the Primary Interlock Switch NEW Switch Setup 80 81 DIA101 98 ARCritical Adjustment Notes Figure Refer to Figures 35Interlock switch status Actuator and toggle OK Check adjustment and wiring onNew setup for the proper adjustment procedure Door does not close freely Remove obstructions or readjustConvection Circuit Main Convection Heater Motor Controller BmscHigh Limit Thermostat Convection Motor109 110 113 111 114 105 104 103 102 107108 106Replace motor. For access to motor shaft, remove top panel † Thermostat tripped Reset and determine why the thermostatCook Door Open Message Verify which switch is not actuating Readjust. See pagesVerify motor spins freely † Motor spins freely Verify motor windings see table belowDisconnect control wiring Plug on schematics pages 55-63 while incrementing blowerConverter Catalytic Converter IR ElementRemoving the IR Element Removing and Installing the Catalytic Converter Installing a New IR Element119 122Schematics and Schematic Components Line Voltage Components Wire Harness Replacement P/NsLow Voltage Components Board Schematic Schematic Tornado NGC MAG Schematic Tornado Ngcew Schematic Tornado Ngced Schematic Brazil NGC Service Parts and Illustrations Control System RelayService Parts and Illustrations Microwave System Monitor Circuit Shown in Failsafe StateMicrowave System Parts Wave Guide/Wave Guide Cover PartsOven Door SBKPrimary and Secondary Interlock Switch Parts Door Switch PartsMonitor Safety Switch Parts Primary Safety Switch Parts80 81 Secondary and Monitor Safety Switch Parts 100 Oven Door PartsConvection Circuit Block Diagram Convection Circuit109 110 113 111 112 Convection Circuit Parts 114 105 104 103 102 107 108 106Wire Harness Replacement P/N 123 Old Switch Setup 126IR Element and Catalytic Converter 122 119129 132 144 139 141 135 137 138 133 134153 155 156 151 152 147 150 162 157 159150 Screw, #8-32 x 3/8, Pphd NGC-2011-8 Comprehensive Part List Comprehensive Part List Comprehensive Part List Relay, K7, Magnetron Fan, Standard Europe, Asia-Pacific MPh Smart Card, Programmed call TurboChef for Part Numbers 800.90T U R B O or