Turbo Chef Technologies NGC-1007 Verify motor spins freely, Below, a is highlighted/backlit

Page 62

50 THE CONVECTION CIRCUIT

I S S U E	R E S O L U T I O N

F1: Blower Running	1. Verify motor spins freely.
Status Bad	Motor seized: Unplug oven and correct obstruction or replace motor.
	Motor spins freely: Verify motor windings (see table below).
	2. Verify motor windings are OK. Measure the resistance between
	windings and chassis. Unplug oven and replace motor if resistances do
	not agree with the values in the table below. If motor is OK, proceed to
	step 3, below.
	3. Determine if status indicator “A” is highlighted/backlit in TEST MODE.
	“A” is highlighted/backlit.
	a. Disconnect control wiring.
	b. Ground OR-9 to chassis to remove backlight on “A”.
	c. Keeping OR-9 grounded, check terminals on the control wiring
	plug for 0-10 VDC control voltage (reference drawing of QC3
	plug on schematics (pages 55-63) while incrementing blower
	speed in TEST MODE (see BLOWER SPEED, page 15).
	d. If DC voltage is present throughout all speed settings in TEST
	MODE (see BLOWER SPEED, page 15), replace motor controller. If
	not, check harness and/or replace I/O board.

MOTOR WINDING RESISTANCES TABLE

TO	FROM	DESCRIPTION	EXPECTED RESISTANCE

Black	Red	Winding (A-B)	2.0 – 2.6 Ohms

Black	White	Winding (A-C)	2.0 – 2.6 Ohms

Red	White	Winding (B-C)	2.0 – 2.6 Ohms

Black, White	Green	Windings to Chassis	Open
or Red

Image 62

Contents Accelerating the World of Cooking For further information call Important Safety Information Please Read First Table of Contents Microwave System Oven DoorConvection Circuit Schematics and Schematic ComponentsService Parts and Illustrations IR Element and Catalytic ConverterImportant Safety Instructions Grounding Instructions Installation, Specifications, and Maintenance Power Supply North America DimensionsStandard Features ConstructionPower Supply South Korea Power Supply Europe, Asia-PacificPower Supply Latin America Built-In Installation FigureInstallation Near Open Heat Source Figure Oven Restraint Kit TC3-0242 KIT SetupInitial Power-up StackingClean Oven Interior Remove the Lower Access PanelRemove and Clean the Cooking Surface Clean Lower Access Panel AreaTheory of Operation Chapter Actual Temperature, Cook Cavity TCC Set Temperature, Cook Cavity CcspSet Temperature, IR Element Irsp and Irsi Actual Temperature, IR Element TIRDisplay Fault CodeKeypad Self-Test StestFault Codes F3 Magnetron Current Low F2 Cook Temperature LowF1 Blower Running Status Bad F4 Door Monitor DefectiveF7 Thermocouple Open F5 Magnetron Over TemperatureThermocouple temperature is below the indicated limit F8 Heat LowControl System Mech K1 Mechanical Relay VDC Power SupplyInterlock Switches K2 Mechanical RelaySelf-Test Function Screen Faults ScreenBlower Speed Screen Heater Test ScreenChanging the Cook Chamber Temperature Diagnostic Display ScreenElectronic Compartment Temperature Screen Cooks ScreenAltering a Recipe Done Screen Snooze ModeLoading a Menu from a Smart Card Time ScreenFunction/Screen Enter Key CodeSmart Card Reader Cable Pin connector Reference page 54 for a schematic of the I/O control boardBoard J3 connector Replace I/O control board If not, correct the voltage supplyRefer to page 50 for motor controller troubleshooting VAC is going to the motor controller via pins 2Troubleshooting 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 Filament Transformers MagnetronHigh-Voltage Transformers F3 FuseWave Guide Cover Replacement Screws, #8, SST NGC-1047Support, Frame Wiring the High-Voltage TransformersNGC-3036Kit, Wave Guide Cover Includes Item 31 and sealant 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 TransformerRemove the top and right side covers MagnetronComponents Back and Enter keys, enter the code 9-4-2-8 and press EnterMgtron soft key. Voltage present should be 200 +/- 10% HV capacitor shorted or failing follow troubleshooting onVoltage Transformers Unplug the oven and replace relay if necessaryOccurrence. See page 25 as well as Oven Door for Troubleshooting see F4 MonitorPrimary and secondary, the control would have recorded Energizing the Microwave SystemOven Door Oven Door Oven Burn-In Procedure Critical Adjustment Notes31 for proper 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 35New setup for the proper adjustment procedure Interlock switch statusActuator and toggle OK Check adjustment and wiring on Door does not close freely Remove obstructions or readjustConvection Circuit High Limit Thermostat Main Convection Heater Motor Controller Bmsc Convection Motor108 109 110 113 111114 105 104 103 102 107 106Cook Door Open Message Verify which switch is not actuating Replace motor. For access to motor shaft, remove top panel† Thermostat tripped Reset and determine why the thermostat Readjust. See pagesDisconnect control wiring Verify motor spins freely† Motor spins freely Verify motor windings see table below Plug on schematics pages 55-63 while incrementing blowerConverter Removing the IR Element IR ElementCatalytic Converter 119 Removing and Installing the Catalytic ConverterInstalling a New IR Element 122Schematics and Schematic Components Low Voltage Components Wire Harness Replacement P/NsLine 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 106IR Element and Catalytic Converter Wire Harness Replacement P/N123 Old Switch Setup 126 122 119129 132 144 139 141 135 137 138 133 134150 Screw, #8-32 x 3/8, Pphd NGC-2011-8 147 150 162 157 159153 155 156 151 152 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