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Vulcan-Hart VFBMW Service Manual

Electric flashbake / microwave oven
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SERVICE MANUAL
MODEL VFBMW
ELECTRIC
®
FLASHBAKE
/ MICROWAVE
OVEN
ML 126807
- NOTICE -
This Manual is prepared for the use of trained Vulcan Service
Technicians and should not be used by those not properly
qualified. If you have attended a Vulcan Service School for this
product, you may be qualified to perform all the procedures
described in this manual.
This manual is not intended to be all encompassing. If you have
not attended a Vulcan Service School for this product, you should
read, in its entirety, the repair procedure you wish to perform to
determine if you have the necessary tools, instruments and skills
required to perform the procedure. Procedures for which you do
not have the necessary tools, instruments and skills should be
performed by a trained Vulcan Service Technician.
Reproduction or other use of this Manual, without the express
written consent of Vulcan-Hart, is prohibited.
A product of VULCAN-HART
LOUISVILLE, KY 40201-0696
Form 24694 (April 2001)

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Summary of Contents for Vulcan-Hart VFBMW

  • Page 1 Vulcan Service Technician. Reproduction or other use of this Manual, without the express written consent of Vulcan-Hart, is prohibited. A product of VULCAN-HART LOUISVILLE, KY 40201-0696...

  • Page 2: Table Of Contents

    ® FLASHBAKE / MICROWAVE OVEN TABLE OF CONTENTS RADIATION SAFETY INSTRUCTIONS ............4 GENERAL .
  • Page 3 ® FLASHBAKE / MICROWAVE OVEN Door Switches - Adjustment ............29 Testing Components .

  • Page 4: Radiation Safety Instructions

    ® FLASHBAKE / MICROWAVE OVEN GENERAL RADIATION SAFETY INSTRUCTIONS PRECAUTIONS TO BE OBSERVED BEFORE Before turning on microwave power for any service test or inspection within the microwave AND DURING SERVICING TO AVOID POSSIBLE generating compartments, check the EXPOSURE TO EXCESSIVE MICROWAVE magnetron, wave guide or transmission line ENERGY.

  • Page 5: Electrical Specifications

    ® FLASHBAKE / MICROWAVE OVEN GENERAL to +60 sec.). Compensation voltage range cycle. The consumer will not notice any change is 108 to 132VAC. in display readout, however, they may notice that the halogen lamps are cycling differently than expected. In the unlikely event that internal oven cavity temperature exceeds 600  F, combi cook operation will be terminated.

  • Page 6: Operation

    ® FLASHBAKE / MICROWAVE OVEN GENERAL OPERATION CLEANING Refer to the INSTRUCTIONS manual shipped with CAUTION: Never use oven cleaners to clean the the oven for complete operating instructions, oven. Never use abrasives or sharp objects on precautions and utensils to use. the oven walls or window.

  • Page 7: Removal And Replacement Of Parts

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS NOTE: References to left and right are as viewed from the front (operator side) of unit. NOTE: Any cable ties removed in order to service the unit should be replaced. Be sure to note the location and routing of wires for proper reinstallation.

  • Page 8: Back Panel

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Remove two screws securing each side of Remove screws securing bottom panel. cover located underneath side of unit. Disengage bottom panel from back panel and Slide cover rearward to disengage cover from remove bottom panel.

  • Page 9: Power Cord

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS BOX INDICATING THE CIRCUIT IS BEING POWER CORD SERVICED. Remove "MAIN COVER.” WARNING: UNPLUG THE MAIN POWER CORD. Disconnect wires from capacitor. Remove "MAIN COVER.” Remove screw securing capacitor. Remove two screws securing strain relief plate and remove plate.

  • Page 10: Cavity Lamp And Damper Door Assembly

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Undo wire wrap and work wires out. CAVITY LAMP AND DAMPER DOOR ASSEMBLY WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 11: Fuse - 20 Amp

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Remove screw and shield. WARNING: DUE TO HIGH VOLTAGE, SPECIAL CARE SHOULD BE TAKEN WHEN MEASURING AROUND THE MAGNETRON. Remove "MAIN COVER.” Discharge high voltage capacitor by shorting the terminals of the high voltage capacitor with an insulated handled screwdriver or insulated jumper wire.

  • Page 12: Door

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS The latch can be removed by pushing it DOOR against spring tension to the end of its travel. Then pry latch out of mounting holes and lift it up enough to be able to WARNING: DISCONNECT THE ELECTRICAL disconnect the spring.

  • Page 13: Control Board

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Remove screw securing top of control panel. Disconnect eight plugs from control board. CAUTION: When reassembling, be certain all plugs are correctly mated. If plug is colored, connect it to same color connector on board. Failure to connect correctly will result in damage to unit.

  • Page 14: Keypad Assembly

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS NOTE: The keypad connector has a locking tab on Remove two screws securing LED display each side that must be released in order to assembly and remove assembly. completely disconnect. Reverse procedure to install.

  • Page 15: Door Switch Assembly

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Remove two screws securing relay board to Remove two screws securing assembly to unit. board support and work relay board out of support. Carefully slide assembly up to disengage tabs and rotate assembly out of unit.

  • Page 16: Upper Lamp Housing And Duct Assembly

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS For middle switch (interlock monitor UPPER LAMP HOUSING AND switch), press tab downward and then DUCT ASSEMBLY pivot switch to clear stops and lift off post. Parts that can be accessed when upper lamp housing and duct assembly is removed: •...
  • Page 17 ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Squeeze tabs and push vent fan motor Work high voltage capacitor wires out of connector out of duct. wire retainer on duct. Pass connector and wires down through hole. NOTE: Cut cable ties as needed to access wiring. Replace wire ties when work is complete.

  • Page 18: Upper Lamp Assembly

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Four screws in left duct. UPPER LAMP ASSEMBLY NOTE: Anytime left duct is removed or lifted, clean perforated area underneath duct. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX.

  • Page 19: Upper Lamp Fan

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS UPPER LAMP FAN UPPER LAMP HOUSING DUCTS WARNING: DISCONNECT THE ELECTRICAL WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT CIRCUIT BOX.

  • Page 20: Left Duct

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Left Duct NOTE: Wires may be inside cable wrap. NOTE: Anytime left duct is removed or lifted, clean perforated area underneath duct. Remove four screws securing left side of duct. Disconnect thermistor plug from control board.

  • Page 21: Magnetron

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Remove four screws securing transformer to Disconnect lead wires from magnetron base and remove transformer. terminals (Model FBMW2). Disconnect choke filter from magnetron terminals (Model FBMW3). Disconnect wire leads from thermal disk. NOTE: If magnetron is being replaced, remove screw securing disk bracket and lay bracket with disk aside.

  • Page 22: Magnetron Cooling Fan

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Remove four screws securing magnetron and MAGNETRON COOLING FAN remove magnetron from oven. Note that these are machine screws. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX.

  • Page 23: Lower Lamp Housing And Duct Assembly

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Work magnetron wires out of wire retainer LOWER LAMP FAN inside of housing. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 24: Turntable Motor

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Installation is easier if motor, plate and ceramic TURNTABLE MOTOR shaft are assembled and then placed on oven. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 25: Upper Lamps

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Pry duct up and twist thermal cut out to line up REAR DISK terminals with cutout in duct and slide it out. Remove "VENT FAN.” Remove screw securing shield and remove shield.

  • Page 26: Lower Lamp

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Lower Lamp Slide disk to disengage other tab from slot and remove disk. WARNING: DISCONNECT THE ELECTRICAL Reverse procedure to install. POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 27: Diode

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS Remove screw securing transformer tab to DIODE base. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 28: Noise Filter Board

    ® FLASHBAKE / MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS NOISE FILTER BOARD (Model FBMW3) WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 29: Service Procedures And Adjustments

    ® FLASHBAKE / MICROWAVE OVEN SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS WARNING: DUE TO HIGH VOLTAGE, SPECIAL CARE SHOULD BE TAKEN WHEN MEASURING AROUND THE MAGNETRON. WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE THE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES.

  • Page 30: Testing Components

    ® FLASHBAKE / MICROWAVE OVEN SERVICE PROCEDURES AND ADJUSTMENTS Low-Voltage Transformer TESTING COMPONENTS WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN Transformer - High Voltage CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING WARNING: DISCONNECT THE ELECTRICAL SERVICED.

  • Page 31: Primary Interlock

    ® FLASHBAKE / MICROWAVE OVEN SERVICE PROCEDURES AND ADJUSTMENTS Primary Interlock Reconnect switch wiring. WARNING: DISCONNECT THE ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Remove "CONTROL PANEL ASSEMBLY.”...

  • Page 32: Performance Test For Microwave

    ® FLASHBAKE / MICROWAVE OVEN SERVICE PROCEDURES AND ADJUSTMENTS PERFORMANCE TEST FOR RADIATION LEAKAGE TEST MICROWAVE NOTE: A radiation leak test must be performed when microwave is being released to customer and Check line voltage under load. Low line voltage after any repair.

  • Page 33: Electrical Operation

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION FUSE ......Rated 20A. Protects magnetron circuit and prevents circuit operation when fuse is blown.

  • Page 34: Component Location

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION initial start of microwave cooking, door will cycle one complete cycle (close and then open) and stop in the open position. DAMPER DOOR SWITCH ... Monitors door position signals control board which controls direction and operation of the damper door motor.

  • Page 35: Tco Locations, Switch Locations

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION TCO Locations, Switch Locations Page 35 of 52 Form 24694 (April 2001)

  • Page 36: Control Board Layout

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION CONTROL BOARD LAYOUT Control Board Connector Identification Form 24694 (April 2001) Page 36 of 52...

  • Page 37: Air Flow Diagrams

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION AIR FLOW DIAGRAMS Combi Cook Page 37 of 52 Form 24694 (April 2001)

  • Page 38: Magnetron

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION Magnetron Microwave Form 24694 (April 2001) Page 38 of 52...

  • Page 39: Component Wiring Diagrams

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION COMPONENT WIRING DIAGRAMS Thermal Cut Outs Page 39 of 52 Form 24694 (April 2001)

  • Page 40: Door Switches

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION Door Switches Form 24694 (April 2001) Page 40 of 52...

  • Page 41: Halogen Lamps

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION Halogen Lamps Page 41 of 52 Form 24694 (April 2001)

  • Page 42: Schematic Diagram

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION SCHEMATIC DIAGRAM Form 24694 (April 2001) Page 42 of 52...
  • Page 43 ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION Page 43 of 52 Form 24694 (April 2001)

  • Page 44: Wiring Diagram

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION WIRING DIAGRAM Form 24694 (April 2001) Page 44 of 52...
  • Page 45 ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION Page 45 of 52 Form 24694 (April 2001)

  • Page 46: Sequence Of Operation

    ® FLASHBAKE / MICROWAVE OVEN ELECTRICAL OPERATION relays RY18 and RY23 energize SEQUENCE OF OPERATION and upper rear lamp starts. Relay RY2 energizes and Conditions powers magnetron. Correct voltage to oven. Lamps and magnetron cycle on 32 second duty cycle. (See page Fuse is good.

  • Page 47: Troubleshooting

    ® FLASHBAKE / MICROWAVE OVEN TROUBLESHOOTING TROUBLESHOOTING DIAGNOSING NON OPERATING UNIT A non operating unit is better defined as a unit that appears to have no power to it (no clock display, cavity lamp or keypad responses). The following components and associated wiring should be checked in the order below when diagnosing a non operating unit.

  • Page 48: Fault Codes

    ® FLASHBAKE / MICROWAVE OVEN TROUBLESHOOTING FAULT CODES The control board monitors various operations and can detect certain failure modes. In the event of specific failures, cooking will be terminated, a four-beep signal will be heard, and a fault code will be displayed. Pressing the CLEAR pad will remove the fault code display, unless the failure is a shorted keypanel switch.
  • Page 49 ® FLASHBAKE / MICROWAVE OVEN TROUBLESHOOTING Food items appear to be under cooked Incorrect type of cooking selected (microwave vs. combi cook). Incorrect time and/or power level for type, size, and quantity of food being cooked. Incorrect cookware for type of food being cooked.

  • Page 50: Troubleshooting Flow Chart

    ® FLASHBAKE / MICROWAVE OVEN TROUBLESHOOTING TROUBLESHOOTING FLOW CHART Form 24694 (April 2001) Page 50 of 52...

  • Page 51: Condensed Spare Parts List

    ® FLASHBAKE / MICROWAVE OVEN CONDENSED SPARE PARTS LIST CONDENSED SPARE PARTS LIST MODELS FBMW2 AND FBMW3 PART NUMBER DESCRIPTION 854065-2 Control panel (keypad assembly) 854065-5 Lower lamp assembly 854065-6 Upper lamp assembly 854065-8 Door latch bracket 854065-13 Vent motor assembly 854065-17 Cavity thermistor 854065-18...
  • Page 52 ® FLASHBAKE / MICROWAVE OVEN NOTES F24694 (April 2001) Printed in U.S.A.

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