Vulcan-Hart VFBMW User manual

A product of VULCAN-HART LOUISVILLE, KY 40201-0696
Form 24694 (April 2001)
- 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 aVulcan ServiceSchool forthisproduct, 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.
SERVICE MANUAL
MODEL VFBMW
ELECTRIC
FLASHBAKE®/ MICROWAVE
OVEN
ML 126807

FLASHBAKE®/ MICROWAVE OVEN
Form 24694 (April 2001) Page 2 of 52
TABLE OF CONTENTS
RADIATION SAFETY INSTRUCTIONS ....................................................... 4
GENERAL............................................................................. 4
Introduction ........................................................................ 4
ElectricalSpecifications............................................................... 5
Installation ......................................................................... 5
Operation.......................................................................... 6
Cleaning .......................................................................... 6
Tools ............................................................................. 6
REMOVALANDREPLACEMENTOFPARTS ................................................. 7
Covers and Panels ................................................................... 7
MainCover..................................................................... 7
Back Panel ..................................................................... 8
Bottom Panel ................................................................... 8
FrontVentGrill ..................................................................... 8
PowerCord ........................................................................ 9
Vent Fan Capacitor .................................................................. 9
VentFan .......................................................................... 9
Cavity Lamp and Damper Door Assembly ................................................ 10
DamperHousingThermalFuse ........................................................ 10
Fuse-20AMP..................................................................... 11
Door............................................................................. 12
Control Panel Assembly .............................................................. 12
Control Panel .................................................................. 12
ControlBoard.................................................................. 13
Keypad Assembly ............................................................... 14
Display....................................................................... 14
LEDDisplay ................................................................... 14
RelayBoard....................................................................... 14
DoorSwitchAssembly............................................................... 15
Upper Lamp Housing and Duct Assembly ................................................ 16
Upper Lamp Assembly ............................................................... 18
Upper Lamp Fan ................................................................... 19
Upper Lamp Housing Ducts ........................................................... 19
RightDuct .................................................................... 19
LeftDuct ..................................................................... 20
CavityThermistor .................................................................. 20
High Voltage Transformer ............................................................ 20
Magnetron ........................................................................ 21
Magnetron Cooling Fan .............................................................. 22
Lower Lamp Housing and Duct Assembly ................................................ 23
LowerLampFan ................................................................... 23
TurntableMotor .................................................................... 24
ThermalCutOuts .................................................................. 24
Cavity,TopLeft ................................................................ 24
Upper Lamps .................................................................. 25
LowerLamp ................................................................... 26
Magnetron .................................................................... 26
Capacitor (High Voltage) ............................................................. 26
Diode............................................................................ 27
Low Voltage Transformer ............................................................. 27
ChokeFilter....................................................................... 27
NoiseFilterBoard .................................................................. 28
SERVICEPROCEDURESANDADJUSTMENTS .............................................. 29
DoorLatchingAdjustment ............................................................ 29
ThermistorTest .................................................................... 29

FLASHBAKE®/ MICROWAVE OVEN
Form 24694 (April 2001)Page 3 of 52
DoorSwitches-Adjustment........................................................... 29
Testing Components ................................................................ 30
Transformer-HighVoltage ....................................................... 30
Capacitor - High Voltage ......................................................... 30
Diode ........................................................................ 30
Low-Voltage Transformer ......................................................... 30
Keypad....................................................................... 30
PrimaryInterlock ............................................................... 31
Door Sensing (Secondary Interlock) ................................................. 31
DoorInterlockSystem ........................................................... 31
PerformanceTestforMicrowave ....................................................... 32
Performance Test for Halogen Lamps ................................................... 32
Radiation Leakage Test .............................................................. 32
ELECTRICALOPERATION .............................................................. 33
Component Function ................................................................ 33
Component Location ................................................................ 34
TCOLocations,SwitchLocations................................................... 35
ControlBoardLayout................................................................ 36
Control Board Connector Identification ............................................... 36
AirFlowDiagrams .................................................................. 37
CombiCook ................................................................... 37
Magnetron .................................................................... 38
Microwave .................................................................... 38
Component Wiring Diagrams .......................................................... 39
ThermalCutOuts............................................................... 39
DoorSwitches ................................................................. 40
Halogen Lamps ................................................................ 41
SchematicDiagram ................................................................. 42
WiringDiagram .................................................................... 44
Sequence of Operation .............................................................. 46
TROUBLESHOOTING .................................................................. 47
Diagnosing Non Operating Unit ........................................................ 47
Fault Codes ....................................................................... 48
Troubleshooting Flow Chart ........................................................... 50
CONDENSED SPARE PARTS LIST ........................................................ 51
© VULCAN 2001

FLASHBAKE®/ MICROWAVE OVEN GENERAL
Form 24694 (April 2001) Page 4 of 52
RADIATION SAFETY INSTRUCTIONS
PRECAUTIONS TO BE OBSERVED BEFORE
AND DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE
ENERGY.
1. Do not operate or allow the oven to be
operated with the door open.
2. Make the following safety checks on all ovens
to be serviced before activating the magnetron
or other microwave source, and make repairs
as necessary:
A. Interlock operation.
B. Proper door closing.
C. Seal and sealing surfaces (arcing, wear,
and other damage).
D. Damage to or loosening of hinges and
latches.
E. Evidence of dropping or abuse.
3. Before turning on microwave power for any
service test or inspection within the microwave
generating compartments, check the
magnetron, wave guide or transmission line
and cavity for proper alignment, integrity, and
connections.
4. Any defective or misadjusted component in the
interlock, monitor, door seal, and microwave
generation or transmission systems shall be
repaired, replaced, or adjusted by procedures
described in this manual before the oven is
released to the owner.
5. A microwave leakage check to verify
compliance with the Federal Performance
Standard should be performed on each
oven prior to release to the owner.
GENERAL
INTRODUCTION
General
The combination FlashBake®and microwave oven
cooks the outside of foods much like conventional
radiant heat, while also penetrating the surface so
the inside cooks simultaneously. While halogen light
is the primary source of power, a “microwave boost”
is added with certain foods. Foods cook evenly and
fast, retaining their natural moisture.
Oven features:
•Turntable rotates to ensure even cooking.
•Halogen lamps; two 1500 watt lamps cook from
the top and one 1500 watt lamp cooks from the
bottom.
•Microwave “boost”is automatically added with
certain foods.
•Oven can also be used as a 950-watt
microwave oven.
•Voltage Compensation: Line voltage is
monitored by the voltage compensation
transformer on the control board. It monitors
voltage from L2 to neutral at the start of each
menu cook selection and adjusts the cooking
time to achieve quality results.
The optimal line voltage of 120VAC has no
compensation. Above 120VAC, time is
subtracted from the recipe (up to -30 sec.).
Below 120VAC, time is added to the recipe (up

FLASHBAKE®/ MICROWAVE OVEN GENERAL
Form 24694 (April 2001)Page 5 of 52
to +60 sec.). Compensation voltage range
is 108 to 132VAC.
Voltage compensation occurs after
approximately 5 seconds of menu cook
operation. The display will show "OPTIMIZING
COOK TIME.”The time will flash and then
display the new adjusted time, based on the
amount of voltage compensation required.
NOTE: Voltage compensation only occurs
during menu cook operation and only occurs
once during the cooking cycle (at the initial
start of the menu cook cycle). When using
menu cook, you are selecting preprogrammed
items from a menu. These items require
compensation for accurate and consistent
cooking results. When cooking with combi
cook, voltage compensation does not occur.
•Thermal Compensation: When cooking food
items consecutively, the temperature inside the
oven cavity can become very hot. The control
automatically compensates for the increased
temperature by adjusting the cooking power
levels of both the upper and lower halogen
lamps. At the start of each new cook operation
(just prior to voltage compensation occurring),
the cavity thermistor reads the cavity
temperature and the control board adjusts
power levels to compensate for heat that
already exists in the oven cavity. It is not
possible to see the adjusted power levels in
the display.
•Thermal Protection: If oven cavity
temperatures reach somewhere between 500
and 600 degrees, or if cook time exceeds 12
minutes of cooking at halogen power levels
greater than 7, all power levels (lamps and
microwave) will be reduced by the control
board to 7 for the remainder of the combi cook
cycle. The consumer will not notice any change
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. When the control
board terminates the combi cook cycle, it
returns the display to its normal off position
(with time of day clock showing in display).
Since the thermistor in the cavity is constantly
being monitored by the control board, when the
unit cools, the control board returns oven to
normal operation.
ELECTRICAL SPECIFICATIONS
Model FBMW2 is supplied with a cord and plug.
For cord and plug units, an NEMA 14-30R wall
receptacle is required.
Model FBMW3 is a unit intended to be hard wired.
NOTE: Early hard wired models left the factory with
the green and white wires crimped together. On
these units the frame is grounded by connection of
ground lead to neutral white lead. Effective January
1, 1996, the National Electrical Code requires that
new construction use a (4) conductor connection
and will not permit grounding through neutral. If
used in new construction after January 1, 1996, or if
local codes do not permit grounding through neutral
white lead, open the factory crimp connection and
connect neutral white lead to branch circuit neutral
conductor in usual manner.
120/208-240, 60 Hz, single phase, 30 amp power
supply is required.
Working voltage = 208 to 264VAC.
INSTALLATION
Refer to the INSTRUCTIONS manual shipped with
the oven for installation instructions.

FLASHBAKE®/ MICROWAVE OVEN GENERAL
Form 24694 (April 2001) Page 6 of 52
OPERATION
Refer to the INSTRUCTIONS manual shipped with
the oven for complete operating instructions,
precautions and utensils to use.
CAUTION: Do not attempt to cook with the oven
empty. If there is no load in the cavity to absorb
the microwave energy, the energy will be
reflected back into the magnetron causing it to
overheat which may result in magnetron failure.
NOTE: The halogen lamps will dim and cycle on
and off during a combi cook cycle, sometimes even
at full power levels. This is normal. The oven senses
the heat level and adjusts automatically. What is
important to note is that while the power levels have
been reduced (thermal compensation), the power
levels which will show in the display will be the
original power levels.
NOTE: The programming on the control board
which controls the upper halogen lamps (U=), the
lower halogen lamp (L=), as well as the high
voltage/magnetron circuits (M=), operates on a duty
cycle of 32 seconds. This means the power level
you select for each component controls the
percentage of "on" time during each 32 second
period of time.
Example: Upper halogen lamp pair set at 80%
(U=08), lower halogen lamp set at 50% (L=05), and
microwave set at 30% (M=03).
CLEANING
CAUTION: Never use oven cleaners to clean the
oven. Never use abrasives or sharp objects on
the oven walls or window.
Refer to the INSTRUCTIONS manual shipped with
the oven for complete cleaning instructions.
TOOLS
•Set of standard hand tools
•Volt-ohm meter with a sensitivity of at least
20,000 ohms per volt.
•Field service grounding kit. (TL 84919)
•1 liter beaker (made of material suitable for
high oven temperature)
•Thermometer (519928 or 538454)
•A microwave leak detector that has been
calibrated by the manufacture within the year.
Examples follow:
1. Holiday: Model HI-1801
Model HI-1501
2. Simpson: Model 380-2

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001)Page 7 of 52
MODEL FBMW2 SHOWN
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.
CAUTION: All removed screws must be replaced to prevent possible microwave energy leakage. Most of
the screws you will be removing will be of two sizes, 1/2" shank and 3/8" shank Phillips head screws.
Note their positions for proper reinstallation. Some screws have machine threads and must be installed
in proper locations.
NOTE: During reassembly, before installing main cover and after all necessary components are replaced and
adjusted, a radiation leak test MUST be performed in the magnetron area.
NOTE: New type connectors are used on this oven. Some have locking tabs that must be released by pressing in
the appropriate place before connectors can be separated. When installing connectors, take extra care to ensure
all tabs in gang connectors are properly aligned before connecting. When installing connectors, listen for click
sound and stop. If connector is seated on too far it may be difficult to remove. Exercise caution when removing
connectors so that components are not damaged.
COVERS AND PANELS
Main Cover
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.
1. Remove screws securing cover at rear of unit.
NOTE: Some early units had two security type
screws (non removable without special tool)
installed. If you encounter one of these units,
remove the special screws and replace them with
standard screws. Also remove the label indicating
the use of the non removable screws.
2. Remove screws securing top of cover. Note
that these are silver screws.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001) Page 8 of 52
3. Remove two screws securing each side of
cover located underneath side of unit.
4. Slide cover rearward to disengage cover from
front sides of unit.
5. Carefully lift cover with vent grill off unit.
6. Reverse procedure to install.
Back Panel
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.
1. Remove "MAIN COVER.”
2. Remove "POWER CORD.”
3. Remove screws securing back panel.
4. Pull bottom of back panel away from unit to
disengage it from bottom panel.
5. Reverse procedure to install.
Bottom panel
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.
1. Remove screws securing bottom panel.
2. Disengage bottom panel from back panel and
remove bottom panel.
3. Reverse procedure to install.
FRONT VENT GRILL
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.
1. Remove screw securing grill on top.
2. Remove one screw on each side of grill.
3. Pull grill out front.
4. Reverse procedure to install.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001)Page 9 of 52
MODEL FBMW2 WITH MAIN COVER INSTALLED
POWER CORD
WARNING: UNPLUG THE MAIN POWER CORD.
1. Remove "MAIN COVER.”
2. Remove two screws securing strain relief plate
and remove plate.
3. Disconnect power cord connectors.
4. Remove screw securing ground wire.
NOTE: Screw is a machine screw with fine threads.
5. Remove power cord through hole in back
panel.
6. Reverse procedure to install.
VENT FAN CAPACITOR
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.
1. Remove "MAIN COVER.”
2. Disconnect wires from capacitor.
3. Remove screw securing capacitor.
4. Reverse procedure to install.
VENT FAN
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.
1. Remove "MAIN COVER.”
2. Disconnect connector for fan motor.
3. Remove screw securing fan assembly to back
panel.
4. Lift fan out of unit.
5. Reverse procedure to install.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001) Page 10 of 52
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.
1. Remove "UPPER LAMP HOUSING AND
DUCT ASSEMBLY.”
2. Remove connector from lamp door switch.
3. Remove connector from lamp socket.
4. Remove one screw securing assembly to top of
cavity.
5. Remove two screws securing assembly to top
of magnetron.
NOTE: Screws removed from magnetron are
different.
6. Disconnect motor connector and thermal fuse
connector.
7. Undo wire wrap and work wires out.
8. Remove screw securing lamp socket.
NOTE: Lamp and socket are replaced as one piece.
9. If door is to be removed, first remove motor
and then remove screw securing bottom of
door.
10. Reverse procedure to install.
DAMPER HOUSING THERMAL
FUSE
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.
1. Remove "UPPER LAMP HOUSING AND
DUCT ASSEMBLY.”
2. Disconnect thermal fuse connector.
3. Undo wire wrap and work wires out.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001)Page 11 of 52
MODEL FBMW2 SHOWN
4. Remove screw and shield.
5. Slide fuse out of slot.
6. Reverse procedure to install.
FUSE - 20 AMP
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.
Important Note: When the 20 amp fuse is blown
due to the operation of the monitor switch, check the
following components and replace the ones found to
be malfunctioning.
A. Door primary interlock switch.
B. Door secondary interlock switch.
C. Door monitor switch.
NOTE: During reassembly, before installing main
cover and after all necessary components are
replaced and adjusted, a radiation leak test MUST
be performed in the magnetron area.
WARNING: DUE TO HIGH VOLTAGE, SPECIAL
CARE SHOULD BE TAKEN WHEN MEASURING
AROUND THE MAGNETRON.
1. Remove "MAIN COVER.”
2. Discharge high voltage capacitor by shorting
the terminals of the high voltage capacitor with
an insulated handled screwdriver or insulated
jumper wire.
3. Remove fuse from holder.
4. Reverse procedure to install.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001) Page 12 of 52
EXPLODED VIEW OF DOOR ASSEMBLY
DOOR
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.
1. Open door.
2. Lift door to disengage hinge pins from holes in
hinges and remove door.
3. To replace door handle, door latch:
A. Insert small flat type screwdriver into gap
between choke cover and lower right
corner of the door frame first and then
around the seal plate to free engaging
parts of choke cover.
B. The latch can be removed by pushing it
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
disconnect the spring.
C. Remove door handle by removing screws
securing it.
4. Reverse procedure to install.
5. Perform "RADIATION LEAKAGE TEST.”
CONTROL PANEL 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.
CAUTION: Certain components in this system
are subject to damage by electrostatic discharge
during field repairs. A field service grounding kit
is available to prevent damage. The field service
grounding kit must be used anytime the control
board is handled.
Control Panel
1. Remove “FRONT VENT GRILL.”

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001)Page 13 of 52
2. Remove screw securing top of control panel.
3. Open oven door.
4. Lift control panel about 1/8" to disengage tabs
at both sides of panel and notch on bottom
pivot arms.
5. Allow panel to tilt forward.
6. 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.
7. Lift panel and work pivot arms out of holes and
remove panel from unit.
Control Board
1. Remove "CONTROL PANEL.”
2. Disconnect connectors going to display board,
LED board and keyswitch board.
3. Remove five screws securing control board and
remove board.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001) Page 14 of 52
NOTE: The keypad connector has a locking tab on
each side that must be released in order to
completely disconnect.
4. Reverse procedure to install.
Keypad Assembly
1. Remove "CONTROL BOARD.”
2. Remove “DISPLAY.”
3. Remove “LED DISPLAY.”
4. Reverse procedure to install.
Display
1. Remove "CONTROL BOARD.”
2. Remove two screws securing display board and
remove board.
3. Reverse procedure to install.
LED Display
1. Remove "CONTROL BOARD.”
2. Remove “DISPLAY.”
3. Remove two screws securing LED display
assembly and remove assembly.
4. Reverse procedure to install.
RELAY BOARD
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.
1. Remove "MAIN COVER.”
2. Remove "CONTROL PANEL.”
3. Disconnect two blue connectors on wires
coming from relay board.
4. Disconnect white connector on wires coming
from relay board.
NOTE: Connector CN100 on relay board is not
removable.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001)Page 15 of 52
5. Remove two screws securing relay board to
board support and work relay board out of
support.
6. Reverse procedure to install.
DOOR SWITCH 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.
1. Remove "CONTROL PANEL.”
2. Identify and disconnect connectors from the
three switches.
3. Remove two screws securing assembly to unit.
4. Carefully slide assembly up to disengage tabs
and rotate assembly out of unit.
5. Remove a switch by pressing appropriate tab to
release switch.
CAUTION: Flex tabs only enough to release
switch. Excessive flexing will result in tab
breaking.
A. For top switch (primary interlock switch),
lift tab away from switch and slide switch
out.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001) Page 16 of 52
B. For middle switch (interlock monitor
switch), press tab downward and then
pivot switch to clear stops and lift off post.
C. For bottom switch (door sensing
secondary interlock switch), press tab
downward and then pivot switch to clear
stops and lift off post.
6. Reverse procedure to install.
7. Adjust as outlined in service procedures and
adjustments "DOOR LATCH.”
8. Perform leakage test.
UPPER LAMP HOUSING AND
DUCT ASSEMBLY
Parts that can be accessed when upper lamp
housing and duct assembly is removed:
•Cavity thermistor.
•Thermal cut out located at top of magnetron.
•Magnetron.
•Upper lamp assembly.
•Upper lamp fan assembly.
•Damper door assembly.
•Magnetron fan assembly.
•Lower lamp fan assembly.
•High voltage transformer.
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.
1. Remove "MAIN COVER.”
2. Remove "VENT FAN.”
3. Remove "BACK PANEL.”
4. Remove screw securing shield and remove
shield.
5. Discharge high voltage capacitor by shorting
the terminals of the high voltage capacitor with
an insulated handled screwdriver or insulated
jumper wire.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001)Page 17 of 52
MODEL FBMW2 SHOWN
MODEL FBMW2 SHOWN
MODEL FBMW3 SHOWN
6. Squeeze tabs and push vent fan motor
connector out of duct.
NOTE: Cut cable ties as needed to access wiring.
Replace wire ties when work is complete.
7. For Model FBMW2:
A. Disconnect wires from vent fan motor
capacitor.
B. Disconnect wires from fuse.
C. Disconnect wires from high voltage
capacitor.
D. Work high voltage capacitor wires out of
wire retainer on duct.
E. Pass connector and wires down through
hole.
8. For Model FBMW3:
A. Disconnect wires from vent fan motor
capacitor.
B. Remove “NOISE FILTER BOARD.”
C. Disconnect wires from high voltage
capacitor.
D. Work high voltage capacitor wires out of
wire retainer on duct.
E. Pass connector and wires down through
hole.
9. Remove screws (13 screws) securing assembly
to top of unit.
NOTE: Screw lengths differ in certain locations.
Identify screws for installation later.
A. Five screws in right duct.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001) Page 18 of 52
B. Four screws in left duct.
NOTE: Anytime left duct is removed or lifted, clean
perforated area underneath duct.
C. Four screws in center metal duct.
10. Perform steps 2 thru 5 in removing "CONTROL
PANEL.”
11. Unplug connectors as required so assembly
can be lifted off unit.
12. Reverse procedure to install.
UPPER LAMP 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.
1. Remove "UPPER LAMP HOUSING AND
DUCT ASSEMBLY.”
2. Remove lamp housing by straightening two
tabs on each side and then separating it from
the duct assembly.
3. Work lamp wires out of wire retainers and
disconnect wires from thermal cut outs.
CAUTION: Use clean dry cloth to handle lamps.
DO NOT get finger prints or any other residue
on lamps because the lamp life will be
shortened. Clean cold lamps with a cloth
moistened with alcohol cleaner to remove skin
oil or other residue.
4. Reverse procedure to install.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001)Page 19 of 52
UPPER LAMP FAN
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.
1. Remove "UPPER LAMP HOUSING AND
DUCT ASSEMBLY.”
2. Work wires out of wire retainer.
3. Remove three screws and lift assembly out.
4. Reverse procedure to install.
UPPER LAMP HOUSING DUCTS
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.
Right Duct
1. Remove "UPPER LAMP HOUSING AND
DUCT ASSEMBLY.”
2. Remove two screws from underside of housing.
3. Remove one screw from top side.
4. Reverse procedure to install.

FLASHBAKE®/ MICROWAVE OVEN REMOVAL AND REPLACEMENT OF PARTS
Form 24694 (April 2001) Page 20 of 52
Left Duct
NOTE: Anytime left duct is removed or lifted, clean
perforated area underneath duct.
1. Remove four screws securing left side of duct.
2. Remove two screws securing duct to top of
lamp housing.
3. Carefully work duct up and out enough to
remove thermal disk from duct and work wires
out of the wire retainers.
4. Reverse procedure to install.
CAVITY THERMISTOR
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.
1. Remove "UPPER LAMP HOUSING AND
DUCT ASSEMBLY.”
2. Remove two screws securing mounting
bracket.
NOTE: Wires may be inside cable wrap.
3. Disconnect thermistor plug from control board.
4. Reverse procedure to install.
HIGH VOLTAGE TRANSFORMER
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.
1. Remove "UPPER LAMP HOUSING AND
DUCT ASSEMBLY.”
2. Remove "MAGNETRON.”
3. Disconnect primary winding connectors.