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SERVICE MANUAL SUPPLEMENT

1. Speed Position Assembly Motor Start Switch Assembly ee eee eens SERVICE PROCEDURES AND ADJUSTMENTS slicer Control Board LEDS dea dow dee doe doe dea dow dee doe dee bea doe doe de doa dea Carriage Speed PCB Assembly Red Voltage Reading Checks 2 dre dee dee dee de bie be dee ae ee ot 8 Speed Position Assembly Yelow Voltage Reading Check Pre Ge MOCK St ne ene Continuity Check eee ee Start Stop Pause Switch __ __ Red MOCKS Voltage Reading Checks SWING de a _ dae ened Automatic manual Switch 2
2. be bth Sth oth bh be nee nee eine ae PCC AGA ete ae ete arene Automatt TOONS ate ate are ave te ate BaSe OPC 2 gt Pause Slicer Automatic Mode Only Changing to Automatic While Operating in Manual LOD SN ded ane ane ate ate dee dite eee dae dan dee doe ane ate 2 Returning Carriage Assembly to eee eee eee eee Reference Material REMOVAL AND REPLACEMENT OF PARTS Slicer Control Board ACCESS Slicer C ntrol Carriage Motor Relay CMCR Carriage Speed PCB Assembly
3. LINK ASSEMBLY NOTE The Yellow LED will flash at a variable rate in relation to the speed at which the carriage assembly is moving Placing a load on the carriage assembly holding onto the carriage handle will slow the carriage assembly movement enough to see a change in the Yellow LED flash rate EXAMPLE LOW speed selected and a load on the carriage assembly will result in a noticeable on off LED flashing rate However with HI selected and no load on carriage assembly the Yellow LED will be flashing rapidly flickering almost appearing to be on constantly Voltage Reading Check NOTE If the Yellow LED does not light at all check slicer control board J6 output voltage 1 Perform SLICER CONTROL BOARD ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS Unplug plug 6P from junction J6 Connect slicer into power source Pull Start Stop Pause switch out half way One With meter on DC setting place COM meter lead on J6 2 and RED meter lead on J6 1 6 Verify that 5VDC is present across terminals J6 1 and J6 2 Adjustment WARNING DISCONNECT THE MAIN POWER CORD CAUTION The optical sensor of the speed position assembly can be damaged if the sensor vane is not first properly aligned with the speed position assembly before operating slicer 1 Perform UPPER AND AUTOMATIC BASE COMPONENT ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS 2 Disconnect mo
4. 1 Conditions A Correct voltage supplied to slicer B Automatic knob and lever in Manual position 1 2LS N O contacts closed C Carriage tray assembly in home position 1 Home Switch N O contacts closed D Circuit breaker 1 CB operating normally contacts closed E Gauge plate closed 1 Interlock switch 1LS contacts open Start Stop Pause switch in OFF position Start Stop Pause switch pushed in fully 1 15 contacts 1 4 1 momentary contacts 2 3 are closed Open gauge plate A Interlock switch 1LS contacts close Start Stop Pause switch pulled out fully to start position A 15 contacts 1 4 15 momentary contacts 2 3 close B Home triac gated 1 KMCR coil energizes a KMCRN O contacts 8 6 close b KMCRN O contacts 2 4 close 2 Pilot light energized AUTO off triac gated ON 1 Knife motor latching circuit energized D ESS energized 1 Knife motor operates Start Stop Pause switch 1S is released to run half way out position A 1S momentary N O contacts 2 3 open 1 Home triac de energizes Knife motor operates through latching circuit until A Start Stop Pause switch 15 is pushed to OFF position 1 15 contacts 1 4 open B Gauge plate is closed 1 Interlock switch 1LS is open Automatic Sequence of Operation 1 2 3 4 F25103 November 2001 Conditions same as manual Automatic knob and
5. 25103 November 2001 29128 SLICER CONDENSED SPARE PARTS LIST CONDENSED SPARE PARTS LIST 2912B SLICER PartNo Sensorvaes oo Sensor Vane F25103 November 2001 Printed in U S A
6. EXERCISE EXTREME CAUTION AT ALL TIMES IF TEST POINTS ARE NOT EASILY ACCESSIBLE DISCONNECT POWER ATTACH TEST EQUIPMENT AND REAPPLY POWER TO TEST 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 SLICER CONTROL BOARD LEDS NOTE The slicer control board LEDs are located on the right side of machine under the carriage transport when transport is in home position and underneath the slicer The three LEDs can be viewed through three holes in the bottom electrical cover CARRIAGE TRANPORT IN HOME Green LED Power LED that indicates 5 VDC is present for slicer control board electronic component operation The Green LED is ON whenever the Start Stop Pause switch is in the run position Start Stop Pause switch pulled half way out Yellow LED Driven by the optical sensor of the speed position assembly and the sensor vane The Yellow LED flashes at a variable rate depending on the speed of the carriage transport assembly Essentially the Yellow LED is ON when the sensor vane blocks the optical sensor light and OFF when the light from the optical sensor is allowed to pass through the sensor vane When the carriage drive linkage is in home position the sensor vane will block the optical sensor light Red LED Diagnost
7. to speed selected Information on components and parts unique to the 2912B can be found in this Service Manual 1 Pull Start Stop Pause switch out fully and Supplement release Pause Slicer Automatic Mode Only A Carriage assembly will finish the current slice cycle slow on the return stroke and stop in home position 2 To resume slicing pull Start Stop Pause switch out fully and release A Carriage assembly will start moving at 1 2 power until control board adjusts for desired speed Changing to Automatic While Operating in Manual Mode 1 Slicer operating in Manual mode Carriage assembly in home position NOTE If carriage assembly is not in home position when automatic knob and lever is set to Automatic and Start Stop Pause switch is pulled out knife motor will shut off 2 Turn automatic lever to Automatic Set carriage speed control switch to desired speed F25103 November 2001 Page 4 of 24 29128 SLICER REMOVAL AND REPLACEMENT OF PARTS REMOVAL AND REPLACEMENT OF PARTS NOTE This section addresses the removal and replacement of components that are unique to the 2912B slicer SLICER CONTROL BOARD ACCESS WARNING DISCONNECT THE MAIN POWER CORD 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 us
8. 24 29128 SLICER SERVICE PROCEDURES AND ADJUSTMENTS 4 Place reflective material mirror or clean putty knife under slicer to observe the Red LED 5 Observe the LEDs while pulling Start Stop Pause switch out half way to run position 6 Verify that the Green LED is ON constantly and the Red LED flashed 3 times quickly then changed to flashing at a 1 second rate NOTE Knife motor will continue to run as long as Start Stop Pause switch is held out fully 7 Start Stop Pause switch out fully and release while observing the LEDs 8 Verify that the Red LED flash pattern changed to three quick flashes and then returned to the 1 second flash rate Voltage Reading Checks 1 index knob to below 0 position closed position 2 Perform SLICER CONTROL BOARD ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS Connect slicer to power source Verify that line voltage is present to slicer control board terminals J4 J5 Hot and J2 J3 Neutral On Off Section of Switch N O Contacts 1 With meter on AC setting place COM meter lead on terminal J1 5 Neutral and Red on J1 3 while plug 1P is connected to J1 A Measured voltage should be the line voltage 120VAC 2 Move Red meter lead to J1 4 A Measured voltage should be approximately 0 0 VAC 3 Pull Start Stop Pause switch out half way to the run position 1S contacts 1 4 closed A Measured voltage across J1 5 and J1 4 should
9. conditions of control board voltage and carriage speed position in automatic mode of operation through the use of Green and Yellow LEDs On board Red diagnostic LED displays functionality of carriage soeed PCB assembly Start Stop Pause switch and home switch by using a flash code COMPONENT LAYOUT 29128 CONTROL BOARD LAYOUT EA CARRIAGE MOT OR soo 10 RELAY CMC Ry RO CONT ROLLER LEDs GEN YEL 25103 November 2001 16 of 24 29128 SLICER ELECTRICAL OPERATION KNIFE MOTOR CONNECTION ASSEMBLY CONNECTION SIDE KMCR 0 KMCR 1 J17 412 ESS 2 ESS 1 14 ESS ESS 4 KMCR 4 8 J11 416 2 6 410 15 NEUTRAL INDICATES COMPONENT SIDE CONNECTIONS 2912B SLICER COMPONENT LOCATION CIRCUIT 115 _ SPEED POSITION AUTOMATIC SLICER CONTROL ASSEMBLY MANUAL OF BOARD SWITCH PAUSE 215 KNIFE MOTOR KMCR CONTROL SWITCH HOME SWITCH SHADED AREA 1 ASSEMBLY CARRIAGE SPEED SHADED AREA ASSEMBLY CARRIAGE MOTOR CAPACITOR BOTTOM VIEW 17 of 24 _ 25103 November 2001 SEQUENCE OF OPERATION 2912B SLICER ELECTRICAL OPERATION KMCR Knife motor control relay CMCR Carriage motor control relay Manual Sequence of Operation
10. driving the carriage assembly at half power until the control board senses the desired speed load presented to the carriage and carriage position in relation to home position Once these factors are known the control board sets the carriage motor to drive the carriage assembly at the correct speed takes two or three carriage stroke cycles to settle into the correct operating speed Page 3 of 24 Control Board Control board software controls the slice stroke speed The software adjusts the slice stroke speed according to the load presented to the carriage assembly at any given time This feature maintains a constant carriage speed as the load is lightened Also the carriage return stroke will be faster than the slice stroke by a proportion determined by the software A feature unique to the 2912B is the use of three LEDs Green Power Yellow Speed Position and Red Diagnostic LEDs are used as a diagnostic tool when troubleshooting the slicer Information regarding the LEDs as a troubleshooting aid can be found in SERVICE PROCEDURES AND ADJUSTMENTS TOOLS Loctite 242 Threads securing bracket sensor BASIC OPERATION In order for the 2912B to operate certain conditions must be met before engaging Start Stop Pause switch 1 Slicer must be plugged into appropriate power source 2 Carriage assembly must be in home position NOTE Carriage assembly is in home position when carriage is pulled nearest
11. open circuit F25103 November 2001 29128 SLICER SERVICE PROCEDURES AND ADJUSTMENTS AUTOMATIC MANUAL SWITCH 2S WARNING DISCONNECT THE MAIN POWER CORD NOTE The automatic manual switch 2S is SPDT switch with J7 5 being the common terminal This switch cannot be checked using the slicer control board LEDs Due to the slicer control board circuitry switch 2S is checked by making a continuity check Checks 1 Perform SLICER CONTROL BOARD ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS 2 Reinstall carriage assembly 3 Set meter to resistance Q to check continuity Testing N O Contacts 4 Automatic knob and lever set to Manual 5 Unplug 2P 7 6 Place meter leads across 2P 5 and 2P 4 A Resistance should be 0 0 ohms B Keeping meter leads on 2P 5 and 2P 4 set automatic knob and lever to Automatic 1 Resistance across 2P terminals 5 4 should be infinite resistance open circuit Testing N C Contacts 7 Set automatic lever to Automatic 8 Place meter leads across 2P 5 and 2P 3 A Resistance should be 0 0 ohms B Keeping meter leads on 2P 5 and 2P 3 set automatic lever to Manual 1 Resistance across 2P terminals 5 3 should be infinite resistance open circuit F25103 November 2001 LAMP 1PL AC VOLTAGE WARNING THE SLICER KNIFE IS VERY SHARP EXERCISE EXTREME CAUTION WHEN WORKING NEAR THE KNIFE 1 Perform SLICER CONTROL BOARD ACCESS a
12. 8 de de inde arte arte de E dete arte de eee eee ee ate dae ane ed ie aq Se ik ata dee te de en tite de de ee arte de dete die eee 5 ave cree ine aes oad ave aren ane aes dee are eve dee een ne aren ree dee aes nee aren ree dee ee ae ee ane de ae ed ELECTRICAL OPERATION deh be bth oth bed th deh eth eh ded ote deh ath ote deb tte Seb te ate de at ted Component Function Start Stop Pause Switch 15 dew doe den dea dew doe dee doe dee dea dee dea dee Carriage Speed PCB Assembly Speed Position Slicer Control Board he ee eee eee ee C mponent eee ee Sequence of Operation Manual Sequence of Operation ata ta ote ane Automatic Sequence of Ope
13. Od OVE 1031402 3515 5 5 15 LAYS YOLOW JAINA 29128 WIRING CONNECTION 973646 DERIVED FROM Page 20 of 24 F25103 November 2001 2912B SLICER TROUBLESHOOTING TROUBLESHOOTING MANUAL SLICING Slicer connected to voltage specified on data plate Gauge plate opened Carriage assembly is in home position Automatic Manual switch set to Manual Oh a ISS a Start Stop Pause switch pulled out fully and released SYMPTOM POSSIBLE CAUSE Knife motor does not run Pilot light does not light No power to slicer NOTE Knife motor may hum if certain components are Start Stop Pause switch 1S inoperative inoperative Home position switch open Magnet weak or missing Carriage transport Auto Man switch 2LS inoperative KMCR inoperative Knife motor control assembly malfunction Slicer control board malfunction Electronic start switch malfunction motor may hum ies oe Oe ON ae ee I Knife motor does not run Pilot light lit NOTE Knife motor may hum if certain components are inoperative inoperative Capacitor inoperative motor may hum Knife motor is inoperative motor may hum Knife motor will only run with Start Stop Pause switch Gauge plate not open held out fully Gauge plate interlock switch 1LS inoperative Auto Man switch 2S is inoperative KMCR contacts 2 4 inope
14. SERVICE MANUAL SUPPLEMENT Use this Service Manual Supplement in conjunction with Service Manual F24569 and Technical Service Bulletins 1053 1054 1064 1078 A 1096 1105 1113 and 1146 HOBART SLICER MODEL 2912B ML 134123 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 F25103 November 2001 29128 SLICER TABLE OF CONTENTS ota ate ate are ane ots ete edie et ee tg are erase ra re 2 arg ara are are aoe ae ate eee etn
15. be the line voltage 120VAC Start Pause Section of Switch Momentary 1 With meter on AC setting place meter lead across terminals J1 5 Neutral and J1 1 while plug 1P is connected to J1 2 Measure voltage Start Stop Pause switch run half way out position Measured voltage across J1 5 and J1 1 should be approximately 0 0 VAC NOTE Knife motor will continue to run as long as Start Stop Pause switch is held out fully Page 13 of 24 Start Stop Pause switch pulled out fully and held out contacts closed Measured voltage across J1 5 and J1 1 should be the line voltage 120 VAC INTERLOCK SWITCH 1LS WARNING DISCONNECT THE MAIN POWER CORD WARNING THE SLICER KNIFE IS VERY SHARP EXERCISE EXTREME CAUTION WHEN WORKING NEAR THE KNIFE NOTE The interlock switch cannot be checked using the slicer control board LEDs Because of slicer control board circuitry a continuity check is used to check the interlock switch Checks 1 Perform SLICER CONTROL BOARD ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS 2 Disconnect plug 1P from junction J1 3 With meter set to measure resistance Q place meter leads across terminals 1P 7 and 1P 8 4 Turn index knob counterclockwise to open gauge plate while observing meter reading 5 Measure resistance A Gauge plate open 1 Resistance should be 0 0 ohms B Gauge plate closed 1 Resistance reading should be infinite resistance
16. control assembly Make certain that the motor start switch assembly is installed so that wider spaced spade terminals of the ESS match the wider spaced terminal fittings on knife motor control assembly during reassembly 5 Remove knife motor control assembly from ESS KMCR CONTACTS NARROW SPACED _ TERMINALS Piet a FS KNIFE MOTOR CONTROL ASSEMBLY 6 If replacing KMCR remove it from the knife motor control assembly NOTE The spacing difference between the narrow and wide terminals on the knife motor control assembly is very slight To help in identifying the correct positioning of the ESS and knife motor control assembly terminals refer to COMPONENT LAYOUT as outlined in ELECTRICAL OPERATION 7 Reassemble ESS and KMCR to knife motor control assembly 8 Secure motor start switch assembly and KMCR to upper base of slicer 9 Connect wiring harness motor wires and AC power wires to knife motor control assembly 10 Reassemble upper electrical cover 11 Reassemble in reverse order UPPER BASE AND AUTOMATIC BASE COMPONENT ACCESS as outlined in this section 12 Reassemble bottom covers 13 Check for proper operation Page 8 of 24 29128 SLICER 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
17. ed anytime the control board is handled 1 Push Start Stop Pause switch in to OFF position Close gauge plate Turn the automatic Knob and lever to Manual Move carriage transport assembly to home position 5 Remove CARRIAGE TRAY ASSEMBLY 6 Remove KNIFE SHARPENER NOTE Make certain that sharpener handle is folded in to avoid breaking handle Use a cloth or other cushioning material to protect slicer finish 7 slicer up and rest slicer on sharpener side of automatic base 8 Remove the electrical cover assembly and position cover assembly to access slicer control board Page 5of 24 UPPER BASE AND AUTOMATIC BASE COMPONENT ACCESS WARNING DISCONNECT THE MAIN POWER CORD 1 Perform SLICER CONTROL BOARD ACCESS as outlined in this section Remove bottom cover Remove the screws securing the speed position sensor P clips to upper base SPE _ _ RLY ASSEMBLY E al r NOTE Remove slicer feet as required to access cap screws securing the automatic base to upper base 4 Remove cap screws securing the automatic base to upper base A Separate automatic and upper bases 5 Reassemble in reverse order F25103 November 2001 29128 SLICER REMOVAL AND REPLACEMENT OF PARTS CARRIAGE SLICER CONTROL BOARD WARNING DISCONNECT THE MAIN POWER CORD CAUTION Certain components in this system are subject to damage by electros
18. ely 0 0 VDC 1 With meter set on AC place COM lead on J1 5 and RED lead on 7 8 Measure voltage a If 120VAC is present slicer control board has malfunction b If 120VAC 15 not present check CMCR or circuit breaker 15 of 24 25103 November 2001 29128 SLICER ELECTRICAL OPERATION ELECTRICAL OPERATION COMPONENT FUNCTION NOTE Only features and components unique to the 29128 slicer are listed in this supplement For a full component function list refer to the 2912 Service Manual Start Stop Pause Switch 1S Three position switch which controls the electrical power to two slicer control board triacs Motor starts when operational conditions are met and the Start Stop Pause switch is pulled fully out A spring mechanism internal to the Start Stop Pause switch will return the Start Stop Pause switch to the run position when the knob is released Carriage Speed PCB Assembly Selects speed of carriage speed motor Speed Position Assembly Monitor for speed and position of the carriage assembly s automatic drive linkage Knife Motor Control Assembly Connection board between the knife motor relay electric start switch and wiring motor and harness Slicer Control Board Controls automatic and manual electrical operations of the slicer through the mircocontroller Determines speed and position of the carriage assembly in automatic mode Monitors and reports
19. erify that the Green LED is ON constantly and the Red LED is flashing at a 1 second rate 8 Move carriage assembly away from home position while observing the Red LED flash pattern NOTE Three quick flashes of the Red LED then a return back to the 1 second flash rate indicates that the home position switch is operating 9 Return carriage assembly to home position while observing the Red LED flash pattern NOTE The Red LED should repeat the 3 quick flashes then return to a 1 second flash rate Continuity Check WARNING DISCONNECT THE MAIN POWER CORD 1 Perform SLICER CONTROL BOARD ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS 2 Disconnect plug 1P from junction J1 on the control board 3 With meter set to resistance Q place meter leads across 1P2 9 and 1P2 10 home position 1 Resistance reading should be 0 0 ohms Move carriage assembly away from home position 1 Resistance reading should be infinite resistance open circuit START STOP PAUSE SWITCH AC VOLTAGE NOTE Both start pause and run positions of the Start Stop Pause switch can be checked either by observing the flash pattern of the Red LED or by voltage readings Red LED Checks NOTE A change in the Red LED flash pattern indicates a functioning Start Stop Pause switch 1 Close gauge plate Place carriage assembly in home position Push Start Stop Pause switch in fully to OFF position Page 12 of
20. ic LED that flashes at 1 second rate when Start Stop Pause switch is pulled half way out Red LED is ON constantly whenever knife motor is running Page 9 of 24 NOTE When gauge plate is closed and the Start Stop Pause switch is pulled out half way or fully Red LED will flash three times then return to the 1 second rate Under a heavy load and at a high speed setting the Red LED may flash or go out This happens only when full power is being applied to the carriage motor CARRIAGE SPEED PCB ASSEMBLY DC VOLTAGE NOTE The carriage PCB assembly can be checked either by observing the flash pattern of the Red LED or by voltage readings The carriage soeed PCB assembly is a six position switch Any change to the carriage speed control knob position will change the resistive value of the circuit This change in resistance results in either a rise or fall of DC voltage across the carriage speed switch terminals CARRIAGE SPEED PCB ASSEMBLY CARRIAGE SPEED CONTROL KNOB N aif NOTE The speed control switch can be checked in manual or automatic mode without the knife motor running Red LED Checks 1 Place carriage assembly in home position 2 Place reflective material mirror or clean putty knife under slicer to observe the LEDs Turn carriage speed control switch to the LOW position fully counterclockwise 4 Pull Start Stop Pause switch out half way to run position F25103 No
21. l CCW A Push Start Stop Pause switch IN to turn power off B Remove meter leads from 7 1 and 7 2 C Unplug 2P from J7 on control board D Pull Start Stop Pause switch out half way F25103 November 2001 NOTE Knife motor should not be running E With meter on DC setting place COM meter lead on 7 1 and Red meter lead pin 7 2 and observe meter reading 1 Measured voltage across these points should be 5 VDC SPEED POSITION ASSEMBLY DC VOLTAGE WARNING THE SLICER KNIFE IS VERY SHARP EXERCISE EXTREME CAUTION WHEN WORKING NEAR THE KNIFE NOTE A flashing Yellow LED in automatic mode indicates a functioning speed position assembly Yellow LED Checks The carriage soeed PCB assembly is checked by observing the flashing rate of the Yellow center LED and by voltage readings 1 Open gauge plate 2 Place carriage assembly in home position carriage speed control switch to the LOW position fully counterclockwise Turn automatic lever to Automatic Place reflective material mirror or clean putty knife under slicer to observe the Yellow center LED 6 Turn slicer ON by pulling the Start Stop Pause switch out fully and releasing NOTE The knife motor should be running and Carriage assembly should be moving 7 Verify that the Green and Red LEDs constantly and the Yellow LED is flashing Page 10 of 24 29128 SLICER SERVICE PROCEDURES AND ADJUSTMENTS
22. lever set to Automatic 215 contacts closed Gauge plate opened A Interlock 115 N C C closed Start Stop Pause switch pulled out fully to start position 15 contacts 1 4 and momentary contacts 2 3 close Page 18 of 24 triac gated 1 energized contacts 2 4 close b contacts 6 8 close 2 KMCR energizes contacts 8 6 close b contacts 2 4 close 3 Pilot light energizes C Automatic off triac gates ON 1 Latching circuit to KMCR energizes D ESS energized 1 Knife motor operates E Bridge rectifier supplies DC to carriage motor F Carriage speed triac gated ON controls DC voltage to carriage motor Start Stop Pause switch 1S is released to run half way out position A 1S momentary N O contacts 2 3 open 1 Home triac gated off Knife and carriage motor operate until A Start Stop Pause switch 15 is pushed to OFF position 1 15 contacts 1 4 open B Gauge plate is closed 1 15 NC C contacts open C Circuit Breaker 1CB opens 1 Carriage motor stops running 2 Knife motor continues to run D Start Stop Pause switch 1S is pulled out fully to initiate pause sequence Pause Sequence of Operation Condition Slicer operating in Automatic mode Start Stop Pause switch 1S is pulled out fully and released while slicer is operating in automatic mode A Slicer control board slows ca
23. ration F25103 November 2001 2 of 24 29128 SLICER GENERAL Pause Sequence of Operation Wiring Diagrams TROUBLESHOOTING feu ev owns dx MARWAN SIIC i Sx oi Se Automatic 5 CONDENSED SPARE PARTS LIST Hobart Corporation 2001 GENERAL INTRODUCTION Overview The 2912B is a 2000 Series based slicer that replaces the 2912SC for roast beef specific customers Micro Ban technology is featured in all exposed plastic components Appearance The outside appearance of the 2912B 1 very similar to the 2912 with only slight changes Heavier stainless steel meat grip arm e Start Stop Pause and Automatic Manual labels Electrical Features Electrically the 2912B features e Slicer circuit board with on board replaceable carriage motor relay Enhanced software with start pause circuitry automatic mode e Optical speed position sensor for carriage speed control Automatic Mode The 2912B can be started in either Automatic or Manual mode of operation e Carriage speed is adjustable 6 speeds Carriage movement is monitored by the speed position assembly and control board In Automatic mode start up the carriage motor begins
24. rative Knife motor starts slow or starts backwards Electronic start switch malfunction Capacitor inoperative Page 21 of 24 _ 25103 November 2001 29128 SLICER TROUBLESHOOTING AUTOMATIC SLICING NOTE Make sure that the knife motor runs in manual slice mode before proceeding If not trouble shoot from manual slicing chart 1 Slicer connected to voltage specified on data plate Gauge plate opened24 Carriage assembly is in home position Automatic knob and lever set to Automatic a 09 Start Stop Pause switch pulled out fully and released SYMPTOM POSSIBLE CAUSE Knife motor does not run in Automatic 1 Auto Man switch 2LS inoperative Knife motor runs Circuit breaker 1 CB tripped Carriage drive motor does not operate Auto Man 2LS inoperative CMCR inoperative Slicer control board malfunction Cannot change speed of carriage drive motor Carriage soeed PCB assembly inoperative Pause feature operates normally Slicer control board malfunction Cannot change speed of carriage drive motor Speed Position assembly inoperative 2 3 4 Carriage drive motor inoperative 5 1 2 1 Pause feature does not operate normally Carriage 2 Sensor vane blocked or missing 3 assembly at times stops away from home position 25103 November 2001 22 24 29128 SLICER 5 23 of 24
25. rdware using Loctite 242 on threads of screws 5 Perform SPEED POSITION ASSEMBLY ADJUSTMENT as outlined in SERVICE PROCEDURES AND ADJUSTMENTS Reassemble in reverse order Replace bottom covers MOTOR START SWITCH ASSEMBLY WARNING DISCONNECT THE MAIN POWER CORD CAUTION Make certain that the electric start switch ESS is connected correctly to the knife motor control board to prevent damage to the start windings of the knife motor NOTE Pay close attention to the orientation of the electric start switch ESS spade lugs with knife motor control assembly when removing connection assembly from the ESS and knife motor relay 1 Perform UPPER BASE AND AUTOMATIC BASE COMPONENT ACCESS as outlined in this section F25103 November 2001 29128 SLICER REMOVAL AND REPLACEMENT OF PARTS 2 Remove the upper electrical cover 3 Note location of electrical wiring and disconnect wiring from knife motor control assembly KNIFE MOTOR CONTROL ASSEMBLY 4 Remove screws securing motor start switch assembly to slicer base and remove motor start switch assembly with KMCR NOTE The ESS and bracket make up the motor start switch assembly It is not necessary to separate the ESS from the bracket F25103 November 2001 NOTE Before removing the knife motor control assembly note pin orientation of ESS with relation to the knife motor
26. rriage motor on return slice stroke preparing to stop in home position B Slicer control board gates AUTO off triac to off condition C KMCR coil de energizes 1 KMCRN O contacts 2 4 and 6 8 open a KMCR and CMCR circuits unlatch and knife motor stops running respectively coil de energizes 1 N O contacts 6 8 2 4 open a Carriage motor stops Start Stop Pause switch 1S is pulled out fully and released A Repeats steps 2 through 5 of AUTOMATIC SEQUENCE OF OPERATION 29128 SLICER ELECTRICAL OPERATION WIRING DIAGRAMS HO_LOW i gt x z Z M LINDO 805 435 HOLMS 18915 4145 09345 51 21219 uays pagoa HOLIMS LHVLS 13818 339 awd St eak cak HOLIMAS 55 TOULNOD 52 5 Sle LO id i et N TSP 274 sr Q H F25103 November 2001 Page 19 of 24 29128 SLICER ELECTRICAL OPERATION YOSNAS 0190 0000 0000 0000 29195 93345 213345 3514 ane IKE LN dl 44M
27. s outlined in REMOVAL AND REPLACEMENT OF PARTS 2 Open gauge plate 3 With meter on AC seiting place meter leads across J1 5 and J1 6 while 1P is connected to 1 4 Connect slicer to power source Pull Start Stop Pause switch out fully and release NOTE Knife motor should be running 6 Measured output voltage should be the line voltage 120 VAC Page 14 of 24 29128 SLICER SERVICE PROCEDURES AND ADJUSTMENTS CARRIAGE MOTOR DC VOLTAGE WARNING THE SLICER KNIFE IS VERY SHARP EXERCISE EXTREME CAUTION WHEN WORKING NEAR THE KNIFE NOTE Output voltage to carriage motor varies with carriage speed selected Voltage to carriage motor is lowest when speed select knob is at the LOW setting counterclockwise and highest with speed select knob set to HI setting clockwise Checks 1 Perform SLICER CONTROL BOARD ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS Open gauge plate Set automatic lever to Automatic With meter on DC setting place COM meter lead on J7 6 and RED meter lead on J7 7 while 2P is connected to J7 Connect slicer to power source Pull Start Stop Pause switch out fully and release to start slicer in automatic mode of operation 7 Measure carriage motor voltage If carriage assembly does not move and measured voltage is within the range of 50VDC to 120VDC check 1 Motor windings 2 Motor brushes 3 Related wiring If measured voltage is approximat
28. sor vane adjustment Readjust if necessary NOTE Make certain that plug 6P is connected to junction J6 on the control board 5 Position slicer control board to view LEDs 6 Connect slicer into power source 7 Start Stop Pause switch out half way to run position Verify that the Green LED is ON constantly Manually move main link assembly through full travel range 10 Verify that the Yellow LED flashes ON and OFF as sensor vane passes through optical sensor of speed position assembly 11 Disconnect power to slicer 12 Reconnect motor drive link assembly to main link assembly 13 Reassemble in reverse order UPPER BASE AND AUTOMATIC BASE COMPONENT ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS Reassemble bottom covers 14 Check for proper operation HOME SWITCH NOTE The home switch can be checked either by observing the flash pattern of the Red LED or by a continuity check Red LED Checks NOTE A change in the Red LED flash pattern indicates a functioning home switch 1 Close gauge plate Place carriage assembly in home position Push Start Stop Pause switch in fully to OFF position 4 Turn automatic lever to Manual F25103 November 2001 OPTICAL SENSOR 5 Place reflective material mirror or clean putty Knife under slicer to observe the Red LED 6 Pull Start Stop Pause switch out half way to run position NOTE Knife motor should not be running 7 V
29. tatic 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 NOTE All electrical connections are made through the slicer control board The control board also houses a replaceable carriage motor relay CMCR and a set of three LEDs that can be used as a troubleshooting aid The carriage motor relay plug and junction J locations are shown in the photos that follow 1 Note locations and unplug all electrical connections on the slicer control board il wines PARAAF RENTAN NOTE The carriage motor relay can be difficult to remove Use care when removing relay from slicer control board 2 Remove CARRIAGE MOTOR RELAY CMCR if it is to be reused on new slicer control board F25103 November 2001 Remove nuts securing control board electrical cover and remove control board Reassemble in reverse order Check for proper operation CARRIAGE MOTOR RELAY CMCR WARNING DISCONNECT THE MAIN POWER CORD CAUTION Exercise care when removing the carriage motor relay to avoid damage to the control board 1 Perform SLICER CONTROL BOARD ACCESS as outlined in this section 2 Carefully pry carriage motor relay from control board terminals SLICER CONTROL 3 Replace carriage mo
30. to operator controls 3 Gauge plate must be opened F25103 November 2001 29128 SLICER GENERAL START STOP PAUSE ri 4 Pull Start Stop Pause switch out fully and release A Carriage motor starts Carriage assembly moves according to speed selected Stop Slicer 1 Close gauge plate 2 Push Start Stop Pause switch in fully NOTE When stopping the slicer in Automatic mode the carriage assembly will stop in its present position unless the Start Stop Pause switch is first Start Slicer pulled OUT and released allowing the carriage assembly to return to home position NOTE Slicer can be started in either Automatic or Manual mode The carriage assembly must be returned to home 1 Start Stop Pause switch out fully and position before slicer can be restarted release Returning Carriage Assembly to Home A Manual mode 1 automatic lever to Manual 1 Knife motor starts 2 Pull carriage assembly to the home position B Automatic mode nearest operator controls 1 Knife motor starts REFERENCE MATERIAL 2 Carriage motor starts The 2912B can be serviced using 2912 Service Manual F 24569 for mechanical and adjustment procedures Parts for the 2912B can be ordered using the 2912B Catalog of Replacement Parts F 43041 NOTE It may take two or three slice strokes for the carriage motor to settle into the desired operating speed 3 Carriage assembly moves according
31. tor drive link assembly from main link assembly and carriage drive motor Page 11 of 24 NOTE Sensor vane is properly adjusted when the sensor vane travels in the approximate middle of the optical sensor for the entire travel path of the carriage transport assembly Pay close attention to the ends of sensor vane as optical sensor contact interference is most likely to occur at these points 3 Loosen screws securing sensor to main link assembly NOTE Apply Loctite 242 to sensor vane screws before adjusting and securing sensor vane to main link assembly A Adjust sensor vane optical sensor clearance by reforming the sensor vane or by moving sensor vane in or out to position sensor vane within the approximate center of the optical sensor for the entire range of main link travel SPEED POSITION INSPECTION HOLES NOTE When viewing the sensor vane through the inspection holes the sensor vane should pass under the center of both inspection holes B Move main link assembly back and forth the full travel range while observing the sensor vane optical sensor clearance through the inspection holes F25103 November 2001 29128 SLICER SERVICE PROCEDURES AND ADJUSTMENTS SENSOR BRACKET 4 i a 5 VS F Ls APPROXIMATE CENTER 5 8 N SPEED POSITION ASSEMBLY gt 5 6896 4 Tighten sensor vane screws and recheck sen
32. tor relay Reassemble in reverse order SLICER CONTROL BOARD ACCESS as outlined in this section 5 Check for proper operation Page 6 of 24 29128 SLICER REMOVAL AND REPLACEMENT OF PARTS CARRIAGE SPEED PCB ASSEMBLY WARNING DISCONNECT THE MAIN POWER CORD CARRIAGE CONTROL KNOB i J CARRIAGE SPEED CB ASSEMBLY 1 Perform UPPER BASE AND AUTOMATIC BASE COMPONENT ACCESS as outlined in this section 2 Note location of carriage soeed PCB assembly wires and disconnect wires 3 Pull carriage soeed PCB assembly knob from switch Unscrew nut and remove switch from base Reassemble in reverse order Check for proper operation SPEED POSITION ASSEMBLY WARNING DISCONNECT THE MAIN POWER CORD NOTE The speed position assembly is mounted to the automatic base with the sensor vane mounted to the main link assembly SPEED POSITION A ASS EMBLY 1 Perform UPPER BASE AND AUTOMATIC BASE COMPONENT ACCESS as outlined in this section Page 7 of 24 2 Disconnect speed position assembly wiring plug 6P from slicer control board junction J6 3 Remove screws securing speed position assembly to automatic base and remove speed position assembly NOTE If sensor vane is not being replaced proceed to step 5 4 Remove screws securing sensor vane and remove sensor vane SPEED POSITION INSPECTION 2 HOLES NOTE Install sensor vane Secure ha
33. vember 2001 29128 SLICER SERVICE PROCEDURES AND ADJUSTMENTS 5 Verify that the Green LED is ON constantly and the Red LED is flashing at a 1 second rate 6 Turn the carriage speed control switch one position clockwise while observing the flash pattern of the Red LED A Three quick flashes then a return to the 1 second rate indicates that the switch 1 operating normally B Repeat the Red LED test for all switch positions Voltage Reading Checks 1 Perform SLICER CONTROL BOARD ACCESS as outlined in REMOVAL AND REPLACEMENT OF PARTS Connect slicer to power source Turn carriage soeed PCB assembly knob to the LOW position fully counterclockwise 4 With the meter on DC setting place COM meter lead on 7 1 and Red lead on 7 2 while 2P is connected to J7 on the control board 5 Pull Start Stop Pause switch out half way to run position NOTE Knife motor should not be running 6 Verify that the Green LED is ON constantly and the Red LED is flashing at a 1 second rate 7 Observe meter reading and refer to table below for each position voltage value Knob Position DC Voltage 6 NOTE change of voltage for each switch position indicates a normally functioning switch To check resistance disconnect power to slicer and unplug 2P from J 7 Measure resistance across 2P terminals 1 2 8 If voltage reading is 0 0 VDC or near zero at slowest setting ful

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