Blodgett TBG36-FM Service And Repair Manual

[Page 1] Blodgett TBG36-FM

TBG36-CM, TBG36-FM AND TBG36-S ELECTRIC CONVEYOR GRILL SERVICE AND REPAIR MANUAL BLODGETT OVEN COMPANY www.blodgettcorp.com 50 Lakeside Avenue, Box 586, Burlington, Vermont 05402 USA Telephone (800) 331-5842, (802) 860-3700 Fax: (802)864-0183 PN G017...

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TABLE OF CONTENTS i 1. INTRODUCTION Unit Description 1 --- 1.................................................................. Specifications 1 --- 2.................................................................... Required Service Tools 1 --- 3.....

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TABLE OF CONTENTS ii 6. MISCELLANEOUS COMPONENTS Hourmeter 6 --- 1....................................................................... Drive Motor 6 --- 2...................................................................... Description 6 --- 2......

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INTRODUCTION CHAPTER 1 ...

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BLODGETT CONVEYOR GRILL 1 --- 1 UNIT DESCRIPTION The Blodgett Conveyor Grill is a microprocessor controlled conveyorized belt cooking grill built by Blodgett. The Blodgett Conveyor Grill uses two Tef- lon coated woven fiberglass belts each encircl...

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INTRODUCTION 1 --- 2 SPECIFICATIONS DIMENSIONS AND WEIGHT SPECIFICATIONS TBG36-CM/AA Counter Model TBG36-FM/AA Floor Model TBG36-S/AA Stackable Model Width 35.75” (91 cm) 35.75” (91 cm) 43” (109 cm) Height 31.5” (80 cm) 49.5” (126 cm) 69”...

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BLODGETT CONVEYOR GRILL 1 --- 3 REQUIRED SERVICE TOOLS In addition to tools normally used when servicing appliances, you may need the following tools: These tools can be ordered individually from Blod- gett Technical Service (888-992-6624 phone; 802-...

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INTRODUCTION 1 --- 4 WIRING DIAGRAMS FIGURE 2 ...

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BLODGETT CONVEYOR GRILL 1 --- 5 FIGURE 3 ...

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UNIT CONTROLS CHAPTER 2 ...

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BLODGETT CONVEYOR GRILL 2 --- 1 CONTROLS IDENTIFICATION 1. SELECT/DISPLAY --- used to select the dis - play information. 2. UP and DOWN ARROW --- u s e d i n p r o g r a m - ming to increase/decrease selection choices. 3. ENTER --- used to enter a me...

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UNIT CONTROLS 2 --- 2 PROGRAMMING FLOW CHART NO YES DOWN UP DOWN UP UP DOWN DOWN UP CONTINUE SPELLING CHANGE SPELLING DONE NO YES NOTES: All temperature setting must be less than or equal to 450 _ F Platen height (H = X.XXX) must be less than or equa...

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BLODGETT CONVEYOR GRILL 2 --- 3 OPERATION FLOW CHART Turn on MAIN POWER SWITCH (turn knob to right) A A Release EMERGENCY LIFT if set (turn knob to right) Turn KEYSWITCH to Menu (horizontal position display reads MENU?A Press (1) desired menus select...

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UNIT CONTROLS 2 --- 4 CALIBRATION FLOW CHART START/POWER switch on Unlocks Display Change linear pot When finished Press OFF/CANCEL Calibrate thermocouple Calibrate 3 platens A THE PAS SWORD MODE ALLOWS ACC ES S TO THE PROGRAM- MING LOGIC AREA OF THE...

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BLODGETT CONVEYOR GRILL 2 --- 5 Press ARR OW key to continue programming A Display reads 4:TEST COOK Change all cooking menu para meters while operating Display reads 5:SET TOPHEAT Press ARR OW key to continue programming Press ENTER then a menu key ...

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UNIT CONTROLS 2 --- 6 FINISHED Display reads 8:SET TIME Press ARR OW key to continue programming B FOR TECHNICIAN ONLY Shows main control board is picking up magnetic speed control output Press ENTER display reads T = X:XX (shows a time value) Press ...

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BLODGETT CONVEYOR GRILL 2 --- 7 CONTROLLER REMOVAL AND REPLACEMENT If repeated nuisance blowing of fuses persists, the current rating of any of the fuses may be increased to 5 amperes. The following are symptoms for a blown fuse: D Definite Purpose C...

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UNIT CONTROLS 2 --- 8 2. Remove the main board as follows: A.) Remove all other Molex connectors from the main board. Note which connector goes to w hich pin loca tion on the board. Be especially careful when removing/re- connecting the tw o 4 pin co...

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BLODGETT CONVEYOR GRILL 2 --- 9 SWITCH REPLACEMENT The follo wing procedure describes how to replace the Emergency L ift, Po wer and Lift Enabl e switches. 1. Remove the drive motor to gain access to the switches. 2. TheLIFTENABLEandPOWERswitcheshave...

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UNIT CONTROLS 2 --- 1 0 Emergency Switch C omponents Contact Block Assembly Mounting Block Actuator Complete Emergency Switch Assembly (Note tips of screws protruding out of mounting block. These screws must be tightened against the sheetme- tal to s...

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TEMPERATURE CONTROL CHAPTER 3 ...

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BLODGETT CONVEYOR GRILL 3 --- 1 DESCRIPTION The temperature control circuitry for the Blodgett Conveyor Oven employs two (2) J-type thermo- couples located at the infeed and outfeed ends of each heating platen. The thermocouple outputs are fed into t...

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TEMPERATURE CONTROL 3 --- 2 WIRING DIAGRAM FIGURE 2 ...

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BLODGETT CONVEYOR GRILL 3 --- 3 TROUBLESHOOTING A problem with uneven cooking or undercooking of food on the top and/or bottom surface may be the result of a temperature control malfunction. It is advisable to use the Cooking Troubleshooting Guide in...

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TEMPERATURE CONTROL 3 --- 4 OVERTEMPERATURE SAFETY THERMOSTAT CIRCUIT A problem w ith the overtemperature safety circuit is indicated w hen a hot grill shuts off for no appar- ent reason. There is a noticeable thunk sound from the back of the unit, i...

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BLODGETT CONVEYOR GRILL 3 --- 5 THERMOCOUPLE DIAGNOSTIC PROCEDURE 1. Visually inspect for any broken wires. Check at control board connector J-4 for any bare wires touching one another or ground. 2. To test suspect thermocouples at room tem- perature...

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TEMPERATURE CONTROL 3 --- 6 Ref. Figure Red + Probe Black -- Probe Result FIGURE 9 (Rule out thermocouple wiring shorted to ground) Each socket on the white Molex plug, one at a time*. Ground lug on unit*. Should read open (no continuity, no beep)...

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BLODGETT CONVEYOR GRILL 3 --- 7 PLATEN CONTACTOR DIAGNOSTIC PROCEDURE 1. Disconnect supply power by opening t he cir- cuit breaker to de-energize the unit. 2. Remove back cover and label all the w ires con- nected to the suspect heating contactor. 3....

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PLATENS CHAPTER 4 ...

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BLODGETT CONVEYOR GRILL 4 --- 1 DESCRIPTION Theupperandlowerplatensaremadefromcast aluminum with an electroless nickel coating. Three incoloy sheathed elements are cast into each plat- en running lengthw ise. A thermocouple is located on the infeed a...

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PLATENS 4 --- 2 PLATEN DIAGNOSTIC PROCEDURE WARNING!! Be careful! You will be working near LIVE ACpowerof208voltsorgreater! Stack capacity models have two services. Check that the correct circuit has been turned off! When working on a de-ener- gized ...

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BLODGETT CONVEYOR GRILL 4 --- 3 PLATEN REMOVAL A ND REPLACEMENT PLATEN REMOVAL 1. Removethewipersandbeltsfrombothplaten assemblies. Clean the platen assemblies be- fore proceeding with any disassembly. 2. Put the upper platen in the CLEAN position 3....

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PLATENS 4 --- 4 5. Disconnect the unit from its power supply. Note that there are three elements in each plat- en and six wires leading from these three ele- ments on the replacement platen. These must be connected properly to form a delta connec- ti...

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BLODGETT CONVEYOR GRILL 4 --- 5 PLATEN REPLACEMENT 1. Assemble the frame members, filler strips, drive roller, drive shaft, spring washers, and re- placement platen in place on the unit. Secure with the four 1/2 -13 bolts and nuts removed. You will n...

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PLATENS 4 --- 6 PLATEN ALIGNMENT 1. If a new platen is being a ligned, turn all the up- per a nd lower platen adjustment bolt/ nut com- binations, using two wrenches, until the s up- port rods are centered in the holes in the frame members. FIGURE 10...

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POSITION C O NTROL CHAPTER 5 ...

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BLODGETT CONVEYOR GRILL 5 --- 1 DESCRIPTION The positioning control uses a 24 VDC lift motor (linear actuator) with internal limit sw itches and an external 2000 W linear potentiometer with a 2-inch stroke, which supplies positioning feedback to the ...

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POSITION CONTROL 5 --- 2 TROUBLESHOOTING POSSIBLE CAUSE(S) SUGGESTED REMEDY SYMPTOM: Measured gap between platens never agrees with the display value --- too high or too low. D Unit not calibrated properly. D Follow instructions to adjust jam nuts on...

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BLODGETT CONVEYOR GRILL 5 --- 3 WIRING DIAGRAM FIGURE 2 ...

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POSITION CONTROL 5 --- 4 LIFT MOTOR NOTE: Yo u may use the 24 VDC power supply ava il- able from Blodge tt Tec h nic a l Support to per- form th e se o pera t ion s. This power supply has connectors that plug into the lift motor and an extend/retract...

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BLODGETT CONVEYOR GRILL 5 --- 5 REMOVING AND REPLACING THE LIFT MOTOR 1. Insert a 2” thick board or other non -marring ob- jects between the platen assemblies to sup- port the weight of the upper platen. 2. Energize the unit and go to the [1:LIFT C...

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POSITION CONTROL 5 --- 6 LINEAR POTENTIOMETER DIAGNOSTIC PROCEDURE 1. Disconnect the cable from J-8 on the control board. 2. Check the resistance between each pair of wiresandcomparewithTABLE2.Iftheresist- ance of the linear potentiometer you are wor...

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MISCEL LANEOUS COMPONENTS CHAPTER 6 ...

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BLODGETT CONVEYOR GRILL 6 --- 1 HOURMETER The Blodgett Conv eyo r Gril l is equipped with a 120 VAC hourmeter wired in parallel with the control board power supply. A normally closed bulb sensor thermostat set to approximately 200_F controls a normal...

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MISCELLANEOUS COMPONENTS 6 --- 2 DRIVE MOTOR DESCRIPTION The belt drive system consists of a 130 VDC gear- motor, a magnetic speed sensor and disk rotor, a microprocessor controller board and power sup- ply, and a chain drive train. Power is supplied...

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BLODGETT CONVEYOR GRILL 6 --- 3 DRIVE TRAIN TROUBLESHOOTING GUIDE The gearmotor control circuitry has proven to be very reliable. Any problems relating to speed con- trol have proven to be mechanical in nature; e.g. belt slippage, loose gears on shaf...

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MISCELLANEOUS COMPONENTS 6 --- 4 DRIVE MOTOR REMOVAL AND REPLACEMENT NOTE: If necessary, go into MENU or PSWD mode to make sure th e platens are moved down into a normal cooking height, not the CLEAN position. 1. Disconnect the unit from the supply p...

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BLODGETT CONVEYOR GRILL 6 --- 5 FIGURE 6 7. Remove and save the drive sprocket and key on the drive motor output shaft. 8. Remove the speed sensor disk from the motor tail shaft. Remove the sheetmetal bracket. Re- install the bracket and sensor disk ...

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MISCELLANEOUS COMPONENTS 6 --- 6 DRIVE MOTOR COMPONENTS WIRING DIAGRAM FIGURE 7 ...

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BLODGETT CONVEYOR GRILL 6 --- 7 SPEED SENSOR REMOVAL AND REPLACEMENT 1. Loosen the setscrew securing the speed sen- sor disk to the drive motor tail shaft. Remove the speed sensor disk. 2. Disconnect the sensor wiring by slitting the black shrink tub...

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MISCELLANEOUS COMPONENTS 6 --- 8 DRIVE ROLLER AND BEARING BLOCK REMOVAL AND REPLACEMENT The drive rollers are secured to shafts supported by spherical bearings mounted in plastic pillow blocks which slide into the outfeed ends of the plat- en frames....

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BLODGETT CONVEYOR GRILL 6 --- 9 10. With the drive shaft just extending past the oth- er end of the drive roller, pull the drive roller up as far as possible to allow the second spring washer to be put in place over the end of the shaft. Push the dri...

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MISCELLANEOUS COMPONENTS 6 --- 1 0 IDLE ROLLER TENSION BLOCKS Belt tensioning is provided by springs located be- hind the nylon idle roller tension blocks. The idle roller tension block/spring assembly is secured to the frame by tw o sheetmetal screw...

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BLODGETT CONVEYOR GRILL 6 --- 1 1 WIPERS 1. The upper wiper assembly snaps onto four screw heads on the outfeed end of the upper platen frame. FIGURE 19 FIGURE 20 2. The lower wiper assembly hangs from tw o brackets with keyhole slots that engage tw ...

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MAINTENANCE CHAPTER 7 ...

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BLODGETT CONVEYOR GRILL 7 --- 1 SERVICE CHECKS Service personnel should check the following on each visit: D Fill out entry in “Service Log” and fax copy to Blodgett Technical Support at 802-860-3784. D Grease drive roller fittings with food serv...