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Vulcan Fitness vfb12 Service Manual

Flashbake
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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
Form 24586 (4/97)
SERVICE MANUAL
VFB12
FlashBake
ML-114905
ML-114908
- NOTICE -
®
OVEN
W/O CORD
W/CORD
LOUISVILLE, KY. 40201-0696

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  • Page 1 SERVICE MANUAL VFB12 ® FlashBake OVEN ML-114905 W/O CORD ML-114908 W/CORD - 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.

  • Page 2: Table Of Contents

    FlashBake OVEN TABLE OF CONTENTS GENERAL ................3 Introduction .

  • Page 3: General

    FlashBake OVEN - GENERAL GENERAL Zone Power Levels INTRODUCTION The lamps are positioned so that the center lamps are General above and below the center of the grill. The outer lamps are located above and below the rear of the ®...
  • Page 4 FlashBake OVEN - GENERAL Electrical • For cord connected Ovens: Plug the oven into a dedicated circuit outlet of the appropriate NEMA NOTE: Throughout this manual the term “STINGER” style and rating. (sometimes called “Wild Leg”) will be used to identify •...

  • Page 5: Tools

    FlashBake OVEN - GENERAL Dimensions • Hi-Temp grease - 424023-1 used on pulley drive TOOLS shaft. • General Purpose Silicone - 424030-1 - used on Standard gasket. • Grounding Kit - 84919. • Standard set of hand tools • Torque Wrench (in•lb) •...

  • Page 6: Removal And Replacement Of Parts

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS Back Panel COVERS AND PANELS Remove the top cover as outlined under WARNING: DISCONNECT ELECTRICAL “COVERS AND PANELS”. POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX Disconnect the lead wires from the fuses, circuit INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 7: Oven Cavity Panels

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS Top Plate Panel NOTE: When removing the right panel, you may have to remove the rack drive pulley as outline Remove the top cover as outlined under under “RACK DRIVE PULLEY”. “COVERS AND PANELS”. Reverse procedure to install.

  • Page 8: Door

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS Remove the nuts that secure the dog bone to the DOOR outer door panel and remove the dog bone. WARNING: DISCONNECT ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED.

  • Page 9: Lamp Shields

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS Install the replacement gasket onto the edge of Lower Lamp Shield the opening and allow to set for a minimum of 8 hours before cooking. Open the door and remove the rack. Remove the screws from the frame of the lower lamp shield.

  • Page 10: High Limit Thermostat

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS Disassembly Remove the high limit thermostat from the top plate panel. Remove the pulley plate assembly as outlined under “PULLEY PLATE ASSEMBLY”. NOTE: Use heat sink compound between the high limit thermostat and the top plate. The high limit Remove the screws that secure the roller support thermostat must be fastened tight against the top you are removing.

  • Page 11: Exhaust Blower

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS Right Spring Disconnect the lead wires from the compartment fan and unplug the lead wires to the exhaust blower motor. Remove the top cover, front panel and the left side panel as outlined under “COVERS AND Remove the strain relief and pull the lead wires PANELS”.

  • Page 12: Display

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS DISPLAY WARNING: DISCONNECT ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Remove the right side panel as outlined under “COVERS AND PANELS”.

  • Page 13: Upper Lamp Shield Switch

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS NOTE: When installing, use high temperature Remove the screws that secure the switch. grease on the surface of the shaft where it NOTE: When installing the switch, the switch contacts the drive pulley bushing. actuator is placed into a hole in the frame where NOTE: The drive pulley must be installed with a the upper lamp cover will close the switch when...

  • Page 14: Door Lock Solenoid

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS DOOR LOCK SOLENOID WARNING: DISCONNECT ELECTRICAL POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX. PLACE A TAG ON THE CIRCUIT BOX INDICATING THE CIRCUIT IS BEING SERVICED. Remove the left side panel as outlined under “COVERS AND PANELS”.

  • Page 15: Lamps

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS Installation LAMPS Insert one end of the lamp into the socket. Make WARNING: DISCONNECT ELECTRICAL sure the indent is positioned over the socket pin POWER TO THE MACHINE AT THE MAIN CIRCUIT and the flat spot is aligned with the slot in the BOX.

  • Page 16: Lamp Socket

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS Remove the component panel. LAMP SOCKET Remove the screws that secure the oven sides to WARNING: DISCONNECT ELECTRICAL the bottom of the oven and tilt forward to access POWER TO THE MACHINE AT THE MAIN CIRCUIT the lower lamp sockets.

  • Page 17: Control Board

    FlashBake OVEN - REMOVAL AND REPLACEMENT OF PARTS NOTE: Torque relay board lugs to 40 in•lb. Disconnect the ribbon cables and plugs connected to the control board. NOTE: When re-connecting the ribbon cable from the display the exposed contacts must be installed to match the exposed contacts of the plug.

  • Page 18: Service Procedures And Adjustments

    FlashBake OVEN - SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS WARNING: CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TEST OR MEASUREMENTS WHILE POWER IS APPLIED TO THE MACHINE. EXERCISE EXTREME CAUTION AT ALL TIMES. IF TEST POINTS ARE NOT EASILY ACCESSIBLE, DISCONNECT POWER, ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST.

  • Page 19: Control Board Test

    FlashBake OVEN - SERVICE PROCEDURES AND ADJUSTMENTS CONTROL BOARD TEST To check if voltage is present at the test points on the control board. Reference the voltages to “GND” of the control board (TP1 or TP2). TP1 = GND TP3 = +5VDC - Oven “on” TP5 = +24VDC - Power to oven TP7 = 24VDC switched TP2 = GND...

  • Page 20: Voltage Test

    FlashBake OVEN - SERVICE PROCEDURES AND ADJUSTMENTS VOLTAGE TEST MANUAL VOLTAGE DETECTION OVER-RIDE Turn the oven on by pressing the ON/OFF button. After a few seconds, the display will settle WARNING: DISCONNECT ELECTRICAL on Recipe 1. POWER TO THE MACHINE AT THE MAIN CIRCUIT BOX.

  • Page 21: Clearing Memory

    FlashBake OVEN - SERVICE PROCEDURES AND ADJUSTMENTS 10. The manual configuration is now stored in CLEARING MEMORY permanent memory. The oven is still in the AUTOMATIC mode and will remain there until Use the jumper stored on J11 of the control the manual mode is enabled by doing the board.

  • Page 22: Alarms And Diagnostics

    FlashBake OVEN - SERVICE PROCEDURES AND ADJUSTMENTS ALARMS AND DIAGNOSTICS MESSAGE PROBABLE CAUSE ACTION High power is not ON. High limit t’stat open. Press any button to clear the --> Press ANY key < -- CB2 open. message. Restart the cook cycle. [16] Door is open.

  • Page 23: Electrical Operation

    FlashBake OVENS - ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION F1 FUSE ....Protects transformer, exhaust blower and compartment fan. F2 FUSE ....Protects transformer, exhaust blower and compartment fan.

  • Page 24: Component Location

    FlashBake OVENS - ELECTRICAL OPERATION COMPONENT LOCATION REAR VIEW...

  • Page 25: Sequence Of Operation

    FlashBake OVENS - ELECTRICAL OPERATION TOP VIEW Cook cycle selected. SEQUENCE OF OPERATION “START” key is pressed. Conditions LED (D15) lit. Correct voltage to oven (LED D14 lit on Exhaust blower motor energized. control board). Compartment fan energized. Power fuses good. Pulley drive motor energized.
  • Page 26 FlashBake OVENS - ELECTRICAL OPERATION Cook cycle ends (If pause key is pressed, A-C The first level items monitored are: only.) Relays open. Oven Door - The door must be closed before Lamps are de-energized. cooking is allowed. If the door is not closed a Pulley drive motor de-energized.

  • Page 27: Wiring Diagram

    FlashBake OVENS - ELECTRICAL OPERATION WIRING DIAGRAM...

  • Page 28: Troubleshooting

    FlashBake OVEN - TROUBLESHOOTING TROUBLESHOOTING SYMPTOM POSSIBLE CAUSES Oven does not operate. LED 14 not lit. Power cord plug problem. Main circuit breaker open. Fuse F1 or F2 open. Oven will not turn on. LED 14 lit, LED 15 Circuit protectors located on the rear of the oven open. is not lit.

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