SERVICE MANUAL SUPPLEMENT
Contents
1. 11 Carriage Transport Assembly passes the slice count switch 3LS on the forward stroke A Ifa slice count other than zero was selected the count decreases by one B Ifa slice count was not selected count display increases by one If the slice count reaches 99 it returns to zero on the next stroke and a beep will sound 12 Carriage begins the return stroke A When the unit counts DOWN to zero the motor speed is reduced as the carriage returns HOME Display returns to preselected number and the PRESET LED remains lit NOTE The motor speed is reduced as the carriage returns HOME to ensure the carriage does not coast beyond the home position 13 If the Slice Pause switch is operated anytime during the carriage stroke the carriage returns home and stops NOTE The motor speed is reduced as the carriage returns HOME to ensure the carriage does not coast beyond the home position Page 10 of 12 MODEL 2912SC SLICER ELECTRICAL OPERATIONS WIRING DIAGRAM usn NI Q3LNIHg HW 15172 d visSe OIHO AQUL LYUVEOH 1 HILIAS Luis SINDeLSS73 In l Y3DIIS IS 2162 A Sa ZH09 05 AOZI OO0 1 WBa TWIL 9003 18907 37993I add YIHLO YO ONY 3002 1831813373 TUNOILYN JRL HEIM A dWOD LSNW SNOILOSNNO2 ONIONNOND UN8 621413303 WOO WJLNI 390 wad JJOFNO MS OLAS 1S Bd se me a ON dG orl LUuLS 2 Et I JHWH TOXINOD if 3010 Owe wad 18 IJN Page 11 of 12 MODEL 2912SC SLICER TROUBLESHOOTI2. Remove the upper electrical cover by removing five screws A Pull cover on an angle away from the on off switch outward and upward for removal vi gt gt P y an Jo 20 Ma A e A 1095 2636 1 wpa 6 Remove three screws to free switch bracket from base 7 Remove two screws nuts and lockwashers to free switch from switch bracket 8 Remove P clamp 9 Note location of switch wires cut wire tie s and disconnect wires 10 Reassemble in reverse order 11 Check unit for proper operation Page 5of 12 MODEL 2912SC SLICER REMOVAL AND REPLACEMENT OF PARTS SLICER CONTROL BOARD MOTOR CONTROL BOARD WARNING UNPLUG UNIT BEFORE SERVICING WARNING UNPLUG UNIT BEFORE SERVICING 1 Remove CARRIAGE TRAY ASSEMBLY 1 Remove CARRIAGE TRAY ASSEMBLY 2 Remove KNIFE SHARPENER 2 Remove KNIFE SHARPENER 3 Turn the slicer up and resting on the sharpener 3 Turn the slicer up and resting on the sharpener side of the automatic base side of the automatic base 3 ELECTRICAL COVER ELECTRICAL COVER ASSEMBLY ASSEMBLY 4 Remove the electrical cover assembly by 4 Remove the electrical cover assembly by removing eight screws and carefully pull removing eight screws and carefully pull assembly outward to access wiring assembly outward to access wiring connections connections SLICER CONTROL BOARD SLICER CONTROL BOARD gt MOTOR CONTROL BOARD MOTOR CONTR
3. sharpener B Reconnect motor after continuity has been side of the automatic base verified Pea NS 9 Check for correct voltage to the slicer ELECTRICAL COVER ASSEMBLY 10 Turn the Index knob above 0 11 Turn on the Slicer 12 Place Lever in automatic position 13 Press and release the SLICE PAUSE switch 14 Check for 120 VAC input at J2 and J1 of motor control board A If incorrect trace back to find the source of voltage loss B If voltage is present 4 Remove the electrical cover assembly by 1 Disconnect J3 from motor control board The automatic drive motor removing eight screws and carefully pull should run in low speed assembly outward to access wiring connections 2 Disconnect J3 and J4 short the connectors on the board The motor 5 Remove the bottom cover by removing nine should run in high speed screws and pull cover upward from behind feet 15 If the motor does not run as stated above 6 Place the connected electrical cover assembly replace motor control board and adjust as tone aUlOm ave Base outlined in AUTOMATIC LOW HIGH SPEED 7 Carefully return the slicer to the upright position ADJUSTMENT taking care to leave clearance between the 16 Reassemble and check for proper operation automatic base and the electrical cover assembly LEAVE CLEARANCE E LEAVE CLEARANCE i Page 7 of 12 MODEL 2912SC SLICER SERVICE PROCEDURES AND ADJUSTMENTS AUTOMATIC LOW H
4. 1 1LS and slicer 2 Operator pulls On Off switch 1SW to start a position 120VAC applied to J3 9 J3 12 J3 8 3 Display shows 0 slices and speed LED S are J3 7 1CR energizes through pin J3 7 on slicer lit conre opar 4 Operator releases 1SW 1SW 2 3 open 1SW A 1PL lights and 1MTR knife motor is 4 1 stay closed energized through 1CR 2 4 3 1CR locks through 1SW 4 1 1LS and slicer oe EPA crease ee control board 6 Operator turns manual automatic lever to 4 Display shows 0 slices and speed LED S are automatic position Normally open contacts of lit 2S and 3S close 120VAC applied to J3 5 thru 5 Operator releases 1SW 1SW 2 3 open 1SW 28 See cares A 120 VAC Neutral at J3 3 from slicer 6 Operator manually moves carriage transport control board assembly through one complete stroke passing slice count switch 3LS and returns to home 7 Enter a slice count if desired The PRESET position LED lights 7 Slice count display increases by one slice per 8 Operator presses slice pause switch Slicer each complete carriage stroke Control Board switches to the automatic mode 9 2CR energized through 1SW 2LS 2S J3 5 J3 3 and 3S A 2CR 2 4 close 120VAC through 2CB A B to J1 on motor control board Page 9 of 12 MODEL 2912SC SLICER ELECTRICAL OPERATIONS 10 Motor control board energizes 2MTR Automatic Drive Motor Automatic Carrier Assembly moves and engages pawl on Carriage Transport Assembly
5. HOBART SERVICE MANUAL SUPPLEMENT MODEL 2912SC AUTOMATIC SLICE COUNT SLICER ML 104832 This Service Manual Supplement should be used with Service Manual Form 24569 02 98 NOTICE This Manual is prepared for the use of trained Hobart Service Technicians and should not be used by those not properly qualified If you have attended a Hobart 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 Hobart 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 Hobart Service Technician Reproduction or other use of this Manual without the express written consent of Hobart Corporation is prohibited A product of Hobart Corporation Troy Ohio 45374 Form 24642 MARCH 1999 MODEL 2912SC SLICER GENERAL TABLE OF CONTENTS GENERAL eae ate eee eee eee Ei EE LO ean OE OE E E A A ROR TRTEOSTROROR SSSR TRIE TRSR TRE ONSET RUE TESS OPEL avgeacerak ae ae ae ka ae ae A oe ee ee ee ER Service NON aio aa ce 2 ea ee ee we Ow Ee EE EE EE EEE EER EERE ES A EN REMOVAL AND REPLACEMENT OF PARTS eee eee eee eee eee eee eee
6. IGH SPEED ADJUSTMENT WARNING UNPLUG UNIT BEFORE SERVICING UNIT NOTE The speed adjustment should be made with a cold automatic motor Use the trimpot tool to make potentiometer adjustments After each potentiometer adjustment on the motor control board the carriage assembly must cycle three complete strokes before the accurate adjusted strokes per minute are displayed Turn the potentiometer clockwise for higher number of strokes counterclockwise for a lower number HIGH SPEED ADJUSTMENT LOW SPEED ADJUSTMENT Remove CARRIAGE TRAY ASSEMBLY Remove KNIFE SHARPENER Turn the slicer up and resting on the sharpener side of the automatic base pan ELECTRICAL COVER J _ ASSEMBLY MIN 4 Remove the electrical cover assembly by removing eight screws and carefully pull assembly outward to access wiring connections 5 Remove the bottom cover by removing nine screws and pull cover upward from behind feet 6 Place the connected electrical cover assembly in front of the automatic base 7 Carefully return the slicer to the upright position taking care to leave clearance between the automatic base and the electrical cover assembly LEAVE CLEARANCE LEAVE C Pastels tel Reinstall the CARRIAGE TRAY ASSEMBLY Plug unit in Turn unit on and place in automatic Press tortoise key until only one LED is lit low speed Press slice pause switch If motor is not running adjust low spee
7. ND REPLACEMENT OF PARTS 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 COMPONENTS ARE HANDLED SLICE COUNT KEYPAD OR BEZEL WARNING UNPLUG UNIT BEFORE SERVICING SLICE COUNT BEZEL 1 Remove CARRIAGE TRAY ASSEMBLY Remove KNIFE SHARPENER Turn the slicer up and resting on the sharpener side of the automatic base 4 Remove the bottom cover by nD ae ae ind feet screws and pull cover upward from be 5 Unscrew the upper right hand foot A Remove four screws to free automatic base from upper base and position automatic base as shown ae y i ee ee 1094 2635 9 Disconnect motor wires in speed selector switch cavity and pull them from half grommet Loosen screw in motor crank link assembly When reinstalling place the motor crank link flush with the end of the output shaft and tighten the bolt to 90 inch pounds MOTOR e SHAFT IBAN MOTOR DRIVE LINK NA ASSEMBLY __ MOTOR CRANK LINK ASSEMBLY 1108 2649 Remove retaining ring where motor drive link assembly is attached to the main link assembly A Pull motor crank link motor drive link assemblies from main link assembly and automatic motor shaft Remove four Allen screws and pull automatic motor from base When installing the automatic motor m
8. NG TROUBLESHOOTING NOTE This troubleshooting covers those symptoms unique to the model 2912SC SYMPTOM POSSIBLE CAUSES Automatic drive motor 2MTR will not start knife Circuit breaker 2CB tripped motor TUNAN Automatic Manual switch 25 35 inoperative Relay 2CR malfunction Slicer control board malfunction Slice count keypad malfunction i 2 3 4 Motor control board malfunction 5 6 7 Automatic drive motor 2MTR inoperative Auto Starts then stops when it leaves home position 1 2CR inoperative AS 2 Slicer Control Board malfunction No counting of slices 1 Slice switch 3LS malfunction a Slicer control board malfunction No counting of slices automatic drive motor won t 1 Slice switch 3LS malfunction stop when slice pause switch pressed automatic operation Up Down arrow for speed selection pressed next led Slice count keypad malfunction does not light Slicer control board malfunction Beeper on continuously Slicer Control Board malfunction 2 Slicer control board malfunction Form 24642 MARCH 1999 Printed in U S A
9. NS ELECTRICAL OPERATION COMPONENT FUNCTION Slice Switch 3LS Monitors carriage tray movement for slice count and auto shutoff feature Slice Count Keypad Indicates slice count Six LEDS indicate carriage speed selected Displays information in the service mode Slicer Control Board Monitors conditions and controls operation of components Automatic Manual Switch 3S Controls mode of operation NOTE 120 VAC REFERS TO THE HOT SIDE OF THE LINE VOLTAGE BLACK WIRE The following examples are based on a model 2912SC 120 60 1 with Home Start Wiring Diagram F 34151A MANUAL SEQUENCE OF AUTOMATIC SEQUENCE OF OPERATION COUNTING UP OPERATION 1 Conditions NOTE This sequence begins with conditions as A Correct voltage is supplied to slicer stated in Steps 1A thru 1F under MANUAL B Index knob is turned to O or above SEQUENCE OF OPERATION COUNTING UP in Carriage Interlock Switch 1LS closed this manual C Carriage Tray Assembly in the home 1 0 a perator pulls On Off switch 1SW to start POSON ROME S Ar SWEN AE e0Sea position 120VAC applied to J3 9 J3 12 J3 8 D On off Switch 1SW in OFF position J3 7 1CR energizes through pin J3 7 on slicer E Automatic Manual a ae in manual control board ition 2 segs e ea A 1PL lights and 1MTR knife motor is l u 4 J3 10 1CR 2 and 2CR 2 Neutral o alla Dio applied to J3 11 1CR 0 2CR 0 and 2 1CR locks through 1SW 4
10. OL BOARD i OT b RELAY 2CR 5 Note the location of the wires and disconnect 5 Note the location of the wires and disconnect them board from the electrical cover assembly 6 Remove the mounting hardware to free the 6 Remove the mounting hardware to free the 7 Reassemble in reverse order board from the electrical cover assembly 8 Check unit for proper operation 7 Reinstall the board and connect the wires 8 Perform AUTOMATIC LOW HIGH SPEED ADJUSTMENT beginning at Step 5 Page 6 of 12 MODEL 2912SC SLICER SERVICE PROCEDURES AND ADJUSTMENTS SERVICE PROCEDURES AND ADJUSTMENTS WARNING CERTAIN PROCEDURES IN THIS SECTION REQUIRE ELECTRICAL TESTS 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 THE MOTOR CONTROL BOARD AND AUTOMATIC DRIVE MOTOR TEST NOTE DUE TO THE OPERATING CHARACTERISTICS OF THE MOTOR CONTROL BOARD AN OPEN CIRCUIT OR A NO LOAD CONDITION AT J6 AND J7 MAY RESULT IN VOLTAGE READINGS WHICH COULD LEAD THE SERVICE TECHNICIAN TO AN INCORRECT CONCLUSION WARNING UNPLUG UNIT BEFORE SERVICING 8 Disconnect the motor wires from J6 and J7 and a continuity check the motor and motor wiring 1 Remove CARRIAGE TRAY ASSEMBLY including the brushes 2 Remove AIRE AE A 4to8ohms is the normal range 3 Turn the slicer up and resting on the
11. d potentiometer clockwise until automatic motor runs 13 Press and hold tortoise key for two seconds to access carriage strokes per minute mode all LEDS off 14 Adjust low speed potentiometer until 16 or 2 is displayed 15 Press hare key until carriage speed is on high all speed LEDS lit 16 Adjust high speed potentiometer until 50 or 0 bh N 2 is displayed 17 Press slice pause switch to halt carriage at home 18 Place A n manual and turn off 19 Unplu g u 20 Remove CARRIAGE TRAY ASSEMBLY 21 Turn the slicer up and resting on the sharpener side of the automatic base 22 Install the electrical cover assembly 23 Install the bottom cover 24 Place slicer on the feet and perform Steps 2 and 1 in this procedure 25 Check unit for proper operation TESTING THE SLICER CONTROL BOARD WARNING UNPLUG UNIT BEFORE SERVICING 1 Perform steps 1 7 and 9 13 of the THE MOTOR CONTROL BOARD AND AUTOMATIC DRIVE MOTOR TEST NOTE 120 VAC REFERS TO THE HOT SIDE OF THE LINE VOLTAGE BLACK WIRE 2 Check for 120 VAC at slicer control board J3 4 J3 5 J3 6 J3 7 J3 8 J3 9 and J3 12 NOTE J3 5 6 9 and J3 10 are inputs 3 If voltages are not present check the circuits associated with these terminals 4 If other components check OK replace slicer control board 5 Reassemble and check for proper operation Page 8 of 12 MODEL 2912SC SLICER ELECTRICAL OPERATIO
12. eens Slice Count Keypad or Bezel 1 ne ee eee eee eens Ores ie E ea neater Gra tre fee aaa ee ee ee ee ee SIGE GONMOIWDOAIC it hk tot ee ee ee a ee RE Motor COMI OlibOanG eeaeee ie be ee ee ee ee ER SERVICE PROCEDURES AND ADJUSTMENTS 00 cece ee eee eee eee eee eas The Motor Control Board and Automatic Drive Motor Test 0 0 0 cc ee Automatic Low High Speed Adjustment 20 0 0 0c cc ee eee Testing the Slicer Control Board 0 0 ee ee eens 2 O72 eel 29 eee een ee ee GOMPOMENt FUNCTION n2 2 205 aranane oe doandyw adhe aie aoe ee ic Manual Sequence of Operation Counting Up 2 0 0 ee eee Automatic Sequence of Operation 0 0 ee eee ees wWinng DIagra rin id ee ee eee ee ee ee ee ee ee ea TROUBLESHOOTING rin anar AS HOBART CORPORATION 1999 Page 2 of 12 MODEL 2912SC SLICER GENERAL GENERAL The model 2912SC ML 104832 is an automatic slicer that displays the Slicer Count Six preset values can be user programmed for the slice count OPERATION Refer to 2912SC Instructions Manual F 34213 2 99 SERVICE INFORMATION This model can be serviced using 2000 Series Service Manual F 24569 02 98 and this manual TOOLS Loctite Number 242 part number 520228 used on automatic motor mounting screws Trimpot tool part number 539123 for adjustment of automatic low high speeds Page 3 of 12 MODEL 2912SC SLICER REMOVAL AND REPLACEMENT OF PARTS REMOVAL A
13. ounting screws use Loctite No 242 and torque to 25 3 inch pounds 10 Remove two screws holding automatic manual 11 Page 4 of 12 switch mounting bracket to automatic base and move out of the way to access slice count bezel mounting screws Remove six screws holding bezel and gasket to automatic base and carefully pull outward to access keypad cable A Disconnect cable from keypad MODEL 2912SC SLICER REMOVAL AND REPLACEMENT OF PARTS 12 Remove six nuts and lockwashers holding keypad to bezel SOO A 5 AL Tin La is lt f Na a TA SoA i Ana E Es PS eaa NAAA AS gt RA E WASHERS NUTS AND LOC 13 Press keypad from bezel using your hands 14 Clean keypad mounting surface of bezel with alcohol using a soft clean cloth prior to installation of keypad 15 If installing a new keypad remove protective paper from over buzzer and backing from perimeter of keypad 16 Reassemble in reverse order 17 Check unit for proper operation SLICE SWITCH 3LS WARNING UNPLUG UNIT BEFORE SERVICING 1 Remove CARRIAGE TRAY ASSEMBLY 2 Remove KNIFE SHARPENER 3 Turn the slicer up and resting on the sharpener side of the automatic base _ ELECTRICAL COVER ASSEMBLY _ _ gt BOTTOM COVER 1093 2634 4 Remove four screws to free automatic base from upper base and position automatic base as shown CI aes D iil ma UPPER BASE AUTOMATIC BASE U 5
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