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Menumaster Jetwave JET19 Series, Service Training Manual

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Menumaster Jetwave JET19 Series Service Training Manual Download Page 7

Microwave Ovens produce voltage up to -5000 volts DC!   
 
Microwave Oven Capacitors can store  high voltage even with oven unplugged! 
 
Always discharge capacitors whenever checking high voltage components! 
 
Always disconnect the power supply before servicing! 
 
NEVER perform high voltage tests! 
 
Wear appropriate eye and hand protection! 
 
Follow safety precautions in Product and Service literature! 
 
Test oven operation after repairs are completed! 
 
 

SAFETY – MICROWAVE SERVICE 

Summary of Contents for Jetwave JET19 Series

Page 1: ...FEATURES OVERVIEW SPECIFICATIONS INSTALLATION COMPONENT LOCATIONS WIRING INFORMATION SERVICE TEST MODE USER OPTIONS RESOURCES COMPONENT ACCESS SERVICE TRAINING MANUAL SAFETY POWER OUTPUT TEST...

Page 2: ...7 COMPONENT ACCESS Antenna Stirrers 19 Blower Fan Motor 23 Control Board 26 Convection Fan Motor 28 Display Board 31 Fuse 32 Catalyst Assy 33 Heater Box Heater 35 Interlock Switch 40 Monitor Relay Boa...

Page 3: ...Watts Minimum temperature rise 14 F 7 5 C 19 F 10 5 C 14 F 7 5 C Power Consumption Amps 16 Amps 26 Amps 13 Amps Watts 3200 Watts 5300 Watts 2900 Watts Dimensions Cabinet in cm Width 19 3 4 50 cm 19 3...

Page 4: ...een air discharge on back of oven and back wall C Allow at least 1 1 4 3 cm of clearance around sides of oven Oven Placement Do not install oven next to or above source of heat such as pizza oven or d...

Page 5: ...or eliminate interference by doing the following Clean door and sealing surfaces of oven according to instructions in Care and Cleaning section Place radio television etc as far as possible from oven...

Page 6: ...d electrician install a three slot receptacle This oven should be plugged into a separate circuit with the electrical rating as provided in product specifications When the combination oven is on a cir...

Page 7: ...lways discharge capacitors whenever checking high voltage components Always disconnect the power supply before servicing NEVER perform high voltage tests Wear appropriate eye and hand protection Follo...

Page 8: ...SAFETY DISCHARGING CAPACITORS ALWAYS DISCHARGE CAPACITORS BY SHORTING TERMINALS USING AN INSULATED TOOL s CAPACITORS CAN HOLD HIGH VOLTAGE EVEN WHEN POWER TO OVEN IS DISCONNECTED...

Page 9: ...ny point 5 centimeters or more from the external surface of the oven The two required safety interlocks shall be designated as primary or secondary in the service instructions for the oven Precautions...

Page 10: ...t Agency guidelines check the oven for microwave leakage using the Narda model 8100 8200 Holaday HI1500 HI1501 or Simpson 380M leakage monitor as outlined in the instructions The maximum leakage level...

Page 11: ...Front View Top Touch Panel Side Touch Panel Removable Air Filter Drip Pan...

Page 12: ...D INTERLOCK SWITCHES BLOWER HOUSING HV TRANSFORMER POWER RELAY MONITOR RELAY BOARD CAPACITORS DIODES HV BOARD TRIACS 3 SIDE TOUCH PANEL HARNESS DISPLAY TO HV BOARD EXHAUST MAGNETRON MAGNETRON TCO AIR...

Page 13: ...DOOR ANTENNA MOTOR THERMAL CUTOUT FUSE FUSE BLOCK POWER CORD TERMINAL BLOCK CONVECTION MOTOR BLOWER MOTOR ANTENNA GEAR ANTENNA GEAR Left Side View Oven Cavity TCO...

Page 14: ...BOTTOM ANTENNA MOTOR ACCESS PANEL USB PORT REMOVABLE AIR FILTER DRIP TRAY Bottom View...

Page 15: ...MOTOR THERMAL CUTOUT 31866P01 BLOWER MOTOR FRONT ANTENNA GEAR HEATER REAR ANTENNA GEAR TEMP SENSOR THERMAL CUTOUT 31866P01 WAVEGUIDE CAVITY Top View Note Waveguide Cavity is not replaceable WAVEGUIDE...

Page 16: ...h corner Then outer door can be removed from inner door panel assembly NOTE If magnetized tools are not used then it is recommended to have the door removed and lying flat otherwise screws may fall in...

Page 17: ...nts within the door assembly Door Hinge Spring found on the Upper Hinge Assembly helps keep door open for easier food removal and the Door Latch Assembly DOOR SPRING DOOR LATCH ASSEMBLY Mounting Screw...

Page 18: ...NNA COVER RETAINING CLIP 4 ANTENNA COVER Ceramic Remove the four retainer clips while supporting the antenna cover OVEN TEMP SENSOR RTD RACK CONVECTION FAN AIR INLET OVEN EXHAUST 2 ANTENNA STIRRER ACC...

Page 19: ...ANTENNA STIRRER Inside Cavity with Cover Removed Note the positioning Antennas Should NEVER be in line with each other FRONT ANTENNA REAR ANTENNA...

Page 20: ...sconnect wiring and remove three securing screws and lift off Antenna Motor Bracket Note the position of top oven thermal cutout mounting bracket The TCO should fit firmly to the top of the cavity Ter...

Page 21: ...ANTENNA MOTOR REMOVAL Cont d ENSURE PROPER ALIGNMENT Triangle to Dot to Triangle to Dot WHEN REASSEMBLING ANTENNA SYSTEM THIS ENSURES PROPER ANTENNA POSITIONING INSIDE THE OVEN CAVITY...

Page 22: ...BLOWER MOTOR RESISTANCE TESTING 60HZ Dual Voltage Rated Products 230V 26 208V 24 Common to USE CAUTION WHEN REMOVING WIRING TERMINALS CAN BE PULLED OUT OF MOTOR BODY CAUSING DAMAGE TO MOTOR ASSEMBLY...

Page 23: ...N WHEN REMOVING WIRING TERMINALS CAN BE PULLED OUT OF MOTOR BODY CAUSING DAMAGE TO MOTOR ASSEMBLY BLOWER MOTOR IS DUAL VOLTAGE RATED CONTROL BOARD SENSES INCOMING LINE VOLTAGE AND SENDS TO MOTOR COMMO...

Page 24: ...emove Blower Box Cover 3 Remove Blower Scroll Housing 4 Remove Blower Wheel Securing Screw Securing Screw 5 Remove two Blower motor mounting screws located behind blower wheel BLOWER SCROLL HOUSING BL...

Page 25: ...CONTROL BOARD Removal Control Board mounts via clips Four along the top 3 along the bottom Note wiring locations before removing wires...

Page 26: ...CONTROL BOARD CONNECTOR LOCATIONS refer to wiring schematic E1 E2 not used E3 J1 LINE 208 230V J2 E4 E5 J3 J4 E6 E7 J7 J9 J10 J6 J8 J11 J5...

Page 27: ...RMINALS CAN BE PULLED OUT OF MOTOR BODY CAUSING DAMAGE TO MOTOR ASSEMBLY CONVECTION FAN MOTOR IS DUAL VOLTAGE RATED CONTROL BOARD SENSES INCOMING LINE VOLTAGE AND SENDS TO MOTOR via TRIAC COMMON LINE...

Page 28: ...AUTION WHEN REMOVING WIRING TERMINALS CAN BE PULLED OUT OF MOTOR BODY CAUSING DAMAGE TO MOTOR ASSEMBLY CONVECTION FAN MOTOR IS DUAL VOLTAGE RATED CONTROL BOARD SENSES INCOMING LINE VOLTAGE AND SENDS T...

Page 29: ...LING ENSURE PROPER MOTOR ORIENTATION WIRE TERMINALS POINT TO THE TOP OF THE OVEN 1 Remove Rear Fan Blade and wiring 2 Remove Heater Box Assembly 3 Remove Convection Fan Blade 1 2 in Cap Nut note order...

Page 30: ...DISPLAY BOARD CONNECTOR LOCATIONS SPEAKER DISPLAY SCREEN FRONT BACK SIDE TOUCH PANEL TOP TOUCH PANEL installed HV LV HARNESS PROGRAM PORT Not Used External Speaker Not Used...

Page 31: ...N THERMAL CUTOUT REAR OF UNIT An open main fuse caused by high amperage requires the replacement of the Monitor Relay Board since high current will cause the monitor relay board s contacts to stick Th...

Page 32: ...CATALYST ASSY ACCESS REMOVAL HOUSING Remove blower and air duct cover Remove duct top and blower motor assy Fold insulation away from catalyst assy to access screws...

Page 33: ...CATALYST ASSY ACCESS REMOVAL Remove screws 10 slide out of housing Has high temperature gasket part 59134320...

Page 34: ...HEATER BOX ACCESS to Heater Convection Fan Motor Remove three 3 rear inch Machine Compartment Bracket screws for the Heater Box Remove Blower Motor Housing Assembly...

Page 35: ...Do Not Tear or Remove the protective High Voltage Polymide Tape part M0275051 Remove High Voltage Transformer by removing wiring noting wire location sliding out of base and lifting out Remove High V...

Page 36: ...ection Motor Mounting Screws Carefully cut tape and pull the insulation from the perimeter of the heater box TAPE Remove Back High Voltage Transformer Blower Assembly Housing and the three 3 rear boar...

Page 37: ...HEATER BOX REMOVED SPACERS EXHAUST GREASE CHANNEL...

Page 38: ...ance Test Terminal to Terminal with at least one wire Disconnected 16 Voltage Testing with Component On Terminal to Terminal with wires securely attached Line Voltage ALWAYS USE CAUTION WHEN MAKING LI...

Page 39: ...INTERLOCK SWITCH ASSEMBLY Removal Remove Bracket Screw With Door Open Remove two 2 screws Assembly can be lifted up and out...

Page 40: ...inuity 0 with Door Closed SECONDARY INTERLOCK SWITCH Open Infinite with Door Open Closed Continuity 0 with Door Closed NC Terminal not used When replacing door switch assembly move as far forward towa...

Page 41: ...e screw Monitor Relay Board and the plastic standoffs come off together Note An open main fuse caused by high amperage requires the replacement of the Monitor Relay Board since high current will cause...

Page 42: ...TESTING 1 Unplug Unit 2 Disconnect J2 Connector Test leads at J2 1 to J2 4 and check for Continuity 0 as shown 3 Plug Unit In 4 J2 1 to J2 4 should now read Open Infinite ALWAYS USE CAUTION WHEN MAKIN...

Page 43: ...POWER RELAY ACCESS REMOVAL Remove wiring and securing screw at bottom of relay Relay is tabbed into mounting bracket...

Page 44: ...ION OF POWER RELAY Line voltage is supplied across terminals 0 1 via the Secondary Interlock Switch Magnetron Thermal Cutouts Oven Thermal Cutout Fuse Control Board J1 1 to J2 3 RESISTANCE TESTING 0 t...

Page 45: ...s APPROX 1100 at room temperature APPROX 1650 at 350oF 177 C THE RTD resistive thermal device is the temperature sensor for the unit Its resistance value increases as temperature increases To Remove R...

Page 46: ...eratures and no food loads CAVITY THERMAL CUTOUT Connects in a looping circuit to Control Board Failure open causes a HOT error code until it resets Purpose is to protect against high oven temperature...

Page 47: ...300 F 149 C Closed 0 SPECIFICATIONS Open Infinite at 300 F 149 C Closed 0 at 257 F 125 C Magnetron Thermal Cutouts are in series and in the circuit that provides line voltage to the Power Relay Failu...

Page 48: ...oes NOT reset Purpose is to protect against extreme oven temperatures and render the oven as non usable until causes are corrected Ohm Resistance Test Terminal to Terminal with at least one wire disco...

Page 49: ...o protect against extreme oven temperatures and render the oven as non usable until the unit cools down and resets Ohm Resistance Test Terminal to Terminal with at least one wire disconnected Closed 0...

Page 50: ...three electrode semiconductor device that will conduct in either direction when triggered by a positive or negative signal at the gate electrode Ohm Resistance Test Gate MT1 MT2 MT1 to MT2 Open Infini...

Page 51: ...tage Testing with Component On MT1 to MT2 0vac If line voltage is read Triac is open so check gate voltage signal MT1 to Gate Approx 0 8vac No voltage Indicates no signal from control board ALWAYS USE...

Page 52: ...S ACCESS REMOVAL REMOVE THREE BRACKET SCREWS Slide assembly out DIODES RIGHT TWO BRACKET SCREWS NEVER TEST HIGH VOLTAGE CARRYING COMPONENTS WITH UNIT POWERED AND ALWAYS DISCHARGE CAPACITORS BEFORE TES...

Page 53: ...LOG IN USE TODAY CANNOT READ THE VERY HIGH RESISTANCE ACROSS THE DIODE METER NEEDS A MINIMUM OF 6 VOLTS OUTPUT ON OHMS SCALE FOR METERS CAPABLE RUN THE FOLLOWING TEST REMOVE DIODE LEAD FROM CAPACITOR...

Page 54: ...BATTERY CAN BE USED TO ASSIST IN PROPER DIAGNOSIS METER SET TO READ DC VOLTS 9VDC Minimum CONNECT THE POSITIVE TERMINAL OF THE BATTERY TO THE SPADE TERMINAL OF THE DIODE AND THE NEGATIVE BATTERY TERM...

Page 55: ...lable commercially and are a fast way to help diagnose capacitors Capacitor values can be obtained by looking at its rating label Values vary from model to model GOOD 748 OPEN 000 SHORTED 1 0 74 MICRO...

Page 56: ...S BEFORE TESTING COMPONENTS PRIMARY WINDINGS COMMON 208 2 COMMON 230 2 OPEN TO GROUND HIGH VOLTAGE SECONDARY HV4 APPROX 28 TO CHASSIS GROUND FILAMENT WINDINGS 5 6 7 8 LESS THAN 1 OPEN TO GROUND HIGH V...

Page 57: ...08 Volts 230 Line Voltage test between Com 230 results should be 230 Volts If not remove wires and test from each wire to chassis ground should be 115V Com L2 through Triac Power Relay and E1 on HV Bo...

Page 58: ...ve Cabinet and Back Panel 2 Remove Transformer wiring note wire connections 3 Remove securing screw 4 Slide Transformer to the right approx one inch 5 Lift Transformer up and out of securing tab slot...

Page 59: ...ions and disconnect appropriate wires from Capacitor and High Voltage Transformer Back Magnetron WIRE 5 to WIRE 6 LESS THAN 1 Open to Chassis Ground Front Magnetron WIRE 7 to WIRE 8 LESS THAN 1 Open t...

Page 60: ...MAGNETRON ACCESS REAR REMOVE COVER REMOVE TCO Thermal Cutout Wiring UNCLIP WIRING 3 LOCATIONS...

Page 61: ...MAGNETRON ACCESS REMOVAL DISCHARGE CAPACITORS THEN REMOVE MAGNETRON WIRING REMOVE BRACKET SCREW and SWING BRACKET DOWN MAGNETRON WIRING POSITIONED IN CENTER OF AIR DUCT...

Page 62: ...MAGNETRON REMOVAL REAR CONT D REMOVE 4 5 16 NUTS AND DROP MAGNETRON OUT OF WAVEGUIDE Upon reassembly always ensure high voltage wiring is firmly secured to magnetron connections...

Page 63: ...ase the following key pads Hidden Pad 1 3 5 7 then 9 Note No keypad beep or display change will occur while pressing keypads Display will show Service Mode and reflect Hz and Line Voltage sensed Once...

Page 64: ...e the Hidden Pad then quickly press and release Program Save 3 Press desired numeric key pad for specific option 4 To change an option press numeric pad again 5 To Save a change press the Program Save...

Page 65: ...MICROWAVE POWER TEST...

Page 66: ...WIRING DIAGRAM...

Page 67: ...WIRING SCHEMATIC...

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