Bunn LPG2E Stainless Steel Electric Burr Grinder
Contents
1. WHI BRN lt 2 lt WHI BRN WHI BLU_ 919 WHI BLU BLK WHI RED RED 230 VOLTS AC 2 WIRE SINGLE PHASE 50 60 HZ 20 27091 082701 SCHEMATIC WIRING DIAGRAM LPG W Capacitor L1 N GREEN BLK BLK RED ___ 57177 RED a GO WHI BLK 2 121 WHI BLK 2 BLK rime WHIBLUES 3 WHIBAN S 4 5 14 WHI BRN 4 i gt BLK WHI BRN ATS WHI BAN WHI BLU lt 14 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ 21 27091 111598 WIRING SCHEMATICS SCHEMATIC WIRING DIAGRAM LPG B GREEN 24 55 t w ef 2 RED RED 1 192115 WHIBIK 15216 BIK WHIBLU 121215 WHI BLU TS 4 ST WHIBRN WHI 22197 GAN 26 6 ee x iyi 15 BLK J 15 25 WHI BRN WHIBLU 9 3 WHI BLU 121512 WHI 3 RED RED 100 VOLTS AC 2 WIRE SINGLE PHASE 50 60 HZ 22 27091 1115982. OPERATING amp SERVICE MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 217 529 6644 27091 0000 8 01 1996 0 Corporation www bunnomatic com CONTENTS User Noties 3 Electrical Requirement 3 Operating 3 4 Coffee 4 5 5 6 SOVICO 8 Wiring 18 INTRODUCTION The LPG will store up to six pounds and the LPG 2E will store up to three pounds of whole bean coffee in each of two hoppers and grind it to a preset grind and amount into an awaiting funnel and filter from most commercial drip coffee brewers The equipment is only for indoor use on a sturdy counter or shelf Adequate space must be available above the grinder to raise the lid when adding beans Use only with whole bean coffee The grind is preset at the factory to drip specifications as set forth by the United States Department of Commerce and adopted by the Coffee Brewing Center of the Pan American Coffee Bureau Adjustments may be made to alter both the amount and grind
3. 2 27091 082701 USER NOTICES Carefully read and follow all notices on the grinder and in this manual They were written for your protection All notices on the grinder are to be kept in good condition Replace any unreadable or damaged labels CAUTION AWARNING PERSONAL INJURY HAZARD KEEP FINGERS AND Use only on a properly protected circuit capable of the rated load Electrically ground the chassis Follow national local electrical codes Do not use near combustibles FOREIGN OBJECTS OUT OF HOPPER OR CHUTE OPENING An extension cord when used must be shorter than 20 feet if 16 gage 3 conductor wire or shorter than 10 feet if 18 gage 3 conductor wire FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE FIRE OR SHOCK HAZARD READ THE ENTIRE OPERATING MANUAL INCLUDING THE LIMIT OF WARRANTY AND LIABILITY BEFORE BUYING OR USING THIS PRODUCT 20545 0000 7 90 1990 Bunn O Matic Corporation 20545 0000 ELECTRICAL REQUIREMENTS The grinder has an attached cordset and requires 2 wire grounded service rated 120 volts ac 15 amp single phase 60 Hz for 120V models 100 volts ac 15 amp single phase 50Hz for 100V models and 230 volts ac 10 amp single phase 50 Hz for 230V models OPERATING CONTROLS Off On Start Switch Models LPG and LPG 2E OFF upper position Switching to this position stops all operation of the grinder ON middle position The switch will return to this position after a
4. Hopper Burr Guard remove the two screws attaching the guard to the motor cover Remove the four 8 32 screws securing hopper to hopper housing Lift hopper lid and hopper divider LPG 2E only as an assembly over the motor assem bly FIG 2 REAR PANEL REMOVAL Remove the four 8 32 screws securing the rear panel and knob cover for Model LPG 2E to the hop per housing On Model LPG 2E let the rear panel hang by the orange and brown wires from the timer board CONTENTS MN 9 Circuit Breaker 9 Dechaffer 10 FIG 3 CAPACITOR 27091 111598 SERVICE cont Capacitor Model LPG cont Location The capacitor is located inside the front panel of the hopper housing next to the Off On Start switch Test Procedure Disconnect grinder from the power source 2 Visually inspect the capacitor for leakage If leak age is visible replace the capacitor 3 Connect the grinder to the power source if the motor does not run disconnect the capacitor wiring harness from the main wiring harness If the motor now runs replace the capacitor Removal and Replacement 1 Disconnect the capacitor wiring harness from the main wiring harness 2 Remove the 8 32 nut attaching the capacitor and mounting bracket to the hopper housing and re move the bracket shield capacit
5. bly Slide rotor 12 lower burr 13 and spring 14 as an assembly off the motor shaft set aside for reassembly Remove burr housing divider 8 and set aside for reassembly NOTE Inspect rotor If rotor needs to be replaced 19 20 21 remove the two 10 32 binding head screws se curing lower burr 13 to the rotor and remove burr Install lower burr 13 on new rotor 12 using two 10 32 binding head screws Slide spring retaining bushing 15 off the motor shaft and set aside for reassembly Remove the two 10 32 binding head screws securing the upper burr 16 to the motor and housing assembly 17 Remove the upper burr 16 and set aside for reassembly NOTE If burrs need to be replaced they must be replaced in matched pairs a FIG 13 SOLENOID AND GATES Retaining Ring W Hopper Gasket Filler Plate Slide Plate Solenoid Plunger and Spring Spacer Plate Setscrew 10 32 Mounting Ring Solenoid and Solenoid Mounting Plate Setscrew 8 32 Burr Housing Divider Motor and Burr Housing 27091 111598 SERVICE cont Motor cont 22 23 Place new motor on it s side and install motor 20 26 27 28 29 30 31 10 11 12 13 14 15 16 Remove the two 8 32 flat head screws securing the motor cover 18 to the motor and housing assembly 17 and remove the cover Set aside for reassembl
6. for a click This resets the motor protection circuit and indicates that an overload may have been encoun tered by the motor An overload can occur when something other than coffee is inserted into the hopper for grinding Refer to Service Circuit Breaker for testing procedure See page 9 Refer to Service Timer for testing procedures See page 16 27091 111598 TROUBLESHOOTING cont Problem Grinder will not start Continued Grinder will not shut off Grinder starts but will not dispense from either hopper Incorrect amount of coffee Incorrect coffee grind dispensed Excessive chaff Grinder only dispenses from one hopper Probable Cause 5 Motor 1 Off On Start switch 2 Timer 1 Hopper s 2 Blockage of hopper s 3 Slide Gate Solenoids Model LPG 2E only 4 Timer 1 Timer adjustment 1 Burr adjustment 1 Dechaffer 1 Hopper selector switch Model LPG 2E only Remedy Each motor is equipped with a tem perature and current overload protec tion feature which will immediately shut off the motor when an overload has occurred Check the grinder for obstructions Refer to Service Motor for testing procedures See page 11 A Place the switch in the OFF upper position B Refer to Service Off On Start Switch for testing procedures See page 14 Refer to Service Timer for testing procedures See page 16 Begin each grind cycle by visually in specting
7. must be 120 volts AC 4 Disconnect the grinder from the power source If voltage is present as described proceed 5 If voltage is not present as described refer to the wiring diagram and check grinder wiring harness 5 Check for continuity across the solenoid coil ter minals If continuity is present as described reconnect the violet wire and the red wire on the right solenoid or the orange wire and the red wire on the left solenoid If continuity is not present as described replace the solenoid 6 Checkthe solenoid for coil action when the Off On Start switch is momentarily pressed to the START lower position and released Connect grinder to the power source Watch the slide gate open and close as the coil magnet attracts and after a period of time releases the plunger 7 Disconnect the grinder from the power source If the slide gate functions as described the solenoid is Operating correctly Ifthe slide gate does not function as described replace the solenoid Removal and Replacement Refer to Fig 18 1 Loosen the two 8 32 pan head screws securing the timer mounting bracket to motor support 2 Move timer bracket timer and rear cover 1 away from the rear of the left solenoid 3 Remove the shoulder screw 2 securing the sole noid to the solenoid mounting plate 6 Set aside for reassembly 4 Slide solenoid 4 and solenoid mounting bracket 3 off of the solenoid plunger 5 5 Remo
8. the hopper s for ample sup plies of whole bean coffee Foreign materials must not block the openings at the bottom of the hopper s Refer to Service Solenoids for test ing procedures See page 14 Refer to Service Timer for testing procedures See page 16 Refer to the Adjustments section See Timer adjustment page 5 Refer to the Adjustment section See Burr adjustment page 5 Replace the dechaffer springs Re placement dechaffer springs are pro vided in the literature package accompnting the grinder See page 10 Refer to Service Hopper selector switch for testing procedures See page 10 27091 111598 SERVICE This section provides procedures for testing and replacing various major components used in this grinder should service become necessary Refer to Troubleshooting for assistance in determining the cause of any problem WARNING Inspection testing and repair of electri cal equipment should be performed only by qualified service personnel The grinder should be unplugged when servicing except when electrical tests are re quired and the test procedure specifically states to plug in the grinder Component Access WARNING Unplug the grinder before the removal of any panel or the replacement of any component All components are accessible by the removal of the hopper and the rear panel FIG 1 HOPPER REMOVAL Remove all the coffee beans from the hopper On Model LPG equipped with
9. arranties that are binding on Bunn Accordingly statements by such individuals whether oral or written do not constitute warranties and should not be relied upon The Buyer shall give Bunn prompt notice of any claim to be made under this warranty by telephone at 217 529 6601 or by writing to Post Office Box 3227 Springfield Illinois 62708 3227 If requested by Bunn the Buyer Shall ship the defective equipment prepaid an authorized Bunn service location If Bunn determines in its sole discretion that the equipment does not conform to the warranty Bunn shall repair the equipment with no charge for parts during the warranty period and no charge for labor by a Bunn Authorized Service Representative during the warranty period If Bunn determines that repair is not feasible Bunn shall at its sole option replace the equipment or refund the purchase price for the equipment THE BUYER S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT WHETHER DERIVED FROM WARRANTY OR OTHERWISE SHALL BE LIMITED AS SPECIFIED HEREIN TO REPAIR OR AT BUNN S SOLE OPTION REPLACEMENT OR REFUND Inno event shall Bunn be liable for any other damage loss including but not limited to lost profits lost sales loss of use of equipment claims of Buyer s customers cost of capital cost of down time cost of substitute equipment facilities or services or any other special incidental or consequential damages
10. burr spring and brass bushing off of the motor shaft Clean the grind chamber and all parts with a dry non metallic bristle brush and wipe with a dry clean cloth Reinstall brass bushing flanged end first spring and rotor with lower burr onto the motor shaft Reinstall load disc flat side toward rotor and burr housing cap assembly to the burr housing Refer to Initial Set up Adjustments section to vary grind or weight of dispensed coffee if necessary FFEE GRINDING On models LPG 2E select either left or right hopper with selector switch and visually inspect the desired hopper for an ample supply of whole bean coffee Place a paper filter into the brew funnel The filter must not be folded over or tilted to one side Insert the funnel into the funnel rails and push until it stops Momentarily press Off On Start switch to the START lower position and release The grinding action will stop automatically after the preset amount of ground coffee is dispensed into the funnel Remove the funnel from the grinder and level the bed of grounds by gently shaking The loaded funnel is now ready for use in any commercial drip coffee brewer according to the manufacturer s instructions 1 STEP 2 STEP 3 STEP 4 STEP 5 4 27091 111598 INITIAL SET UP ADJUSTMENTS The grind can be set from fine to very coarse The grind may be adjusted for use in most commercial coffee brewers The following procedures shoul
11. ction NOTE Exact adjustment will vary according to bean roast or added flavoring Timer Adjustment Model LPG 2E Fill hoppers with whole bean coffee and select hopper to be adjusted Remove the cover frpm the timer dials Set the timer dial to 2 seconds for each 1 1 2 ounces of ground coffee desired Grind a few cycles to verify the setting by weighing samples Adjust the timer to correspond with the chart below Approximate Amount Ounces Timer Settings in Seconds 2 6 Timer Adjustment Model LPG 1 2 3 Use this 5 second per ounce figure as an APPROXIMATE guide only 1 1 2 2 1 4 3 3 4 P1035 Repeat steps 2 4 for remaining hopper Unplug the grinder and remove the 2 hole plug in the rear cover Set the timer dial to 5 seconds for each ounce of ground coffee desired Verify the setting by weighing a few samples P1744 5 27091 111598 TROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered If the problem remains after exhausting the troubleshooting steps contact the 0 Technical Service Department e Inspection testing and repair of electrical equipmen
12. d and solenoid compo nents 2 from the hopper housing 3 as an assembly NOTE Steps 5 thru 14 apply only to Model LPG 2E 5 Refer to Fig 13 Remove the three 8 32 Keps nuts 6 Liftthe retaining ring w hopper gasket 1 over the motor and burr housing assembly 9 Set aside for reassembly 7 Remove the filler plate 2 and set aside for reas sembly 8 Liftslide plate solenoid plunger and spring 3 off of the dowel pin in the mounting ring 6 and slide solenoid plunger and spring 3 out of solenoid coil Set aside for reassembly Repeat for opposite side 27091 111598 SERVICE cont Motor cont 9 10 11 12 13 Slide spacer plate 4 off of burr housing divider 8 and set aside for reassembly Loosen the 10 32 setscrew 5 securing the mounting ring and solenoid bracket 6 to the burr housing Lift mounting ring solenoid bracket and solenoids 6 over the motor and burr housing assembly 9 and set aside for reassembly Remove the 8 32 setscrew 7 and set aside for reassembly Lay motor on it s side NOTE Refer to Fig 14 for the disassembly and assem bly of the burrs and rotor 14 Remove the two 10 32 fillister head screw secur 15 16 17 18 ing burr housing cap 10 to the burr housing Remove cap burr adjusting screw decaffing plate and decaffer support 10 as an assembly Set aside for reassembly Remove load disc 11 and set aside for reassem
13. d be used to make adjustments NOTE A change in the burr adjustment will also change the amount dispensed Any adjustment to the burrs should be followed by an adjustment of the timer dials Burr Adjustment 2 Unplug the grinder and empty all beans from the hopper s Plug in the grinder place funnel with filter into the funnel rails Momentarily press the Off On Start switch to the START lower position with desired hopper selected and release run few grind cycles until all of the coffee in the grind chamber is dispensed Remove the funnel with filter and carefully tip the grinder over on it s back Place the Off On Start switch in the START lower position and using the grind adjustment key provided slowly turn the adjusting screw in a clockwise direction until a metallic whine is heard due to the rubbing of the grinding burrs It may be necessary to start more than one grind cycle to obtain the sound Make a mark with a pen on the decal to note the position of the arrow on the grind adjustment screw The following settings approximately correspond to the CBC recognized grinds All are referenced from the arrow position marked in step 5 FINE GRIND Rotate the adjusting screw 7 hash marks in a counterclockwise direction DRIP GRIND Rotate the adjusting screw 8 hash marks in a counterclockwise direction REGULAR COARSE GRIND Rotate the adjusting screw 10 hash marks in a counterclockwise dire
14. d secure with nuts and internal tooth lockwashers 10 Place timer knobs on timers 11 Reconnect harness plug to the terminal block on the timer board Timer Model LPG FIG 21 TIMER Location The timer is located inside the rear access panel Adjustments can be made by removing the 2 hole plug Test Procedure 1 Disconnect grinder from the power source 2 Insert the leads of a voltmeter set to read at least 120 volts AC along side the red wire terminal 1 and the white black wire terminal 2 of the har ness plug Place the Off On Start switch in the ON center position Connect the grinder to the power source The indication must be 120 volts AC for 120 volt models 100 volts for 100 volt models and 230 volts for 230 volt models 3 Disconnect the grinder from the power source lf voltage is present as described proceed to step 4 If voltage is not present as described refer to the wir ing diagram and check the grinder wiring harness 4 Insert the positive lead of a volt meter set to read at least 120 volts DC 157 volts DC on units with capacitor along side the black wire termi nal 3 of the harness plug and insert the negative lead along side the white wire terminal 6 of the harness plug Place the Off On Start switch in the START lower position Connect the grinder to the power source The indication must be 120 volts DC for 120 volt models 157 volts DC on units with capaci
15. eaker in motor support and secure with face nut Reconnect the wires Refer to FIG 6 when reconnecting the wires SOV ae RED from Motor LPG 2E BLK from Start Switch LPG Ox 25 _ BLK from Power FIG 6 CIRCUIT BREAKER TERMINALS 27091 111598 SERVICE cont Dechaffer FIG 7 DECHAFFER Location The dechaffer spring plates are located in the burr housing cap OPTONAL EXTRA FINE DECHAFFER P1063 FIG 8 DECHAFFER REMOVAL REPLACEMENT Removal and Replacement Refer to Fig 8 Place new dechaffer spring plate 2 in the slot in the burr housing cap Place dechaffer support 1 over dechaffer spring plate 2 support 3 and secure with a 4 40 truss head screw 1 Remove coffee beans from hopper s 2 Lay grinder on it s back 3 Remove the 4 40 truss head screw securing dechaffer support 1 to the burr housing cap 4 Remove dechaffer support 1 5 Remove dechaffer spring plate 2 from burr hos ing cap 6 For models with extra fine dechaffer remove dechaffer support 3 8 Hopper Selector Switch Model LPG 2E 2 FIG 9 HOPPER SELECTOR SWITCH Location The Hopper Selector Switch is located in the lower left front of the hopper housing Test Procedure Disconnect grinder from the power supply Remove all wires from the switch terminals Check that the switch is installed pr
16. from the factory setting WARRANTY Bunn O Matic Corp Bunn warrants the equipment manufactured by it to be commercially free from defects in material and workmanship existing at the time of manufacture and appearing within one year from the date of installation In addition 1 Bunn warrants electronic circuit and or control boards to be commercially free from defects in material and workmanship for three years from the date of installation 2 Bunn warrants the compressor on refrigeration equipment to be commercially free from defects in material and workmanship for two years from the date of installation 3 Bunn warrants that the grinding burrs on coffee grinding equipment will grind coffee to meet original factory screen sieve analysis for three years from date of installation or for 30 000 pounds of coffee whichever comes first This warranty does not apply to any equipment component or part that was not manufactured by Bunn or that in Bunn s judgement has been affected by misuse neglect alteration improper installation or operation improper maintenance or repair damage or casualty THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY WRITTEN OR ORAL EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE The agents dealers or employees of Bunn are not authorized to make modifications to this warranty or to make additional w
17. grind cycle has begun and will remain in this position after grinding has ceased START lower momentary position Pressing the switch to this position and releasing initiates a grind cycle Hopper Selector Switch Model LPG 2E only LEFT Switching to this position allows beans to be ground from the left hopper RIGHT Switching to this position allows beans to be ground from the right hopper 3 27091 111598 CLEANING EXTERIOR SURFACES The use of a damp cloth rinsed in any mild nonabrasive liquid detergent is recommended for cleaning all surfaces Bunn O Matic equipment Care should be taken not to scratch the hopper or windows with any abrasive material Regular cleaning will keep your grinder looking new for years GRIND CHAMBER 1 2 3 0 WARNING Unplug grinder before removal of any panel grind chamber housing parts Empty all beans from both 5 Plug in the grinder place funnel with filter into funnel rails Press the Off On Start switch to the START lower position and release Runafew grind cycles until all the coffee in the grind chamber is dispensed and disconnect grinder from the power source Remove the funnel with filter and carefully tip the grinder over on it s back Remove the two 10 32 screws securing burr housing cap assembly to the burr housing and remove burr housing cap assembly Remove load disc and slide rotor with lower
18. operly FIG 10 Place the selector switch in the left position Check for continuity across the terminals on the rear of the switch continuity is present as described proceed to 6 If is not present as described replace the 6 Place the selector switch in the right position 7 Check for continuity across the terminals on the rear of the switch Continuity should not be present across terminals in the right position If continuity is not present as described reconnect the wires the switch is operating properly continuity is present replace the switch Removal and Replacement Remove all wires from the switch terminals Compress the clips inside the front of the housing and gently push the switch through the opening 3 Push the new switch into the opening and spread the clips to retain the switch in the housing 4 Refer to Fig 10 when reconnecting the wires WHI to OFF ON START Switch BLU to Timer 1 4 BLU is P1038 FIG 10 HOPPER SELECTOR SWITCH TERMINALS Viewed from rear 27091 061400 SERVICE cont Motor FIG 11 MOTOR Location The motor is located inside the hopper assembly Test Procedures 1 Disconnect grinder from the power supply 2 On Model LPG 2E disconnect the black wire and the white wire to the motor from the main wiring harness
19. opposite side Place filler plate 2 on mounting ring 6 over the top of the slide plates 3 with the holes in the filler plate in line with the holes in the mounting ring Install retaining ring w hopper gasket 1 using three 8 32 pan head screws and three 8 32 keps nuts Refer to Fig 12 Install motor solenoids and sole noid components 2 in the hopper housing 3 using three 10 32 truss head screws 1 Reconnect wires for motor and solenoids Refer to wiring schematic on page 18 27091 111598 SERVICE cont OFF ON START Switch FIG 15 OFF ON START SWITCH Location The Off On Start switch is located on the right front side of the hopper housing Test Procedure 1 Disconnect grinder from the power source 2 Remove all wires from the switch terminals Check for continuity across the 187 terminals of the switch when it is held in the lower START position Continuity must not be present across these terminals in the center or upper position continuity is present as described proceed to 4 If continuity is not present as described replace the switch 4 Check for continuity across the 25 terminals of the switch when itis in the ON position Continu ity must not be present in the upper OFF posi tion If continuity is present as described reconnect the wires the switch is operating properly If continuity 15 not present as described re
20. or and capacitor wiring harnes as an assembly 3 Disconnect the wiring harness from the capacitor and attach it to a new capacitor making sure the black wire attaches to the positive pole FIG 4 4 Wrap the shield around the capacitor and place into the mounting bracket Slide the lower tab of the mounting bracket between the wrapper and base and secure in place over the mounting stud with the 8 32 nut 5 Reconnect the wiring harness to the main wiring harness WHI BRN FIG 4 CAPACITOR TERMINALS Circuit Breaker Location The circuit breaker is located on the rear of the grinder next to the power cord strain relief bushing The circuit breaker is not available on Model LPG equipped with capacitor FIG 5 CIRCUIT BREAKER Test Procedure 1 Disconnect grinder from the power source 2 Remove the wires from the circuit breaker 3 Check for continuity between the terminals Con tinuity must be present between the terminals If continuity is present as described the circuit breaker is functioning properly continuity is not present as described press reset button and repeat step 3 if continuity is not present as described replace the circuit breaker Removal and Replacement Remove the wires from the circuit breaker Remove the face nut securing circuit breaker to the motor support Remove circuit breaker Install new circuit br
21. place the switch Removal and Replacement 1 Remove all wires from the switch terminals 2 Compress the clips inside the front of the hopper housing and gently push the switch through the Opening 3 Push the new switch into the opening and spread the clips to retain the switch in the hopper housing 4 Reconnect all the wires to the switch terminals 5 Refer to Fig 16 when reconnecting the wires RED from Motor SG YEL to Timer P1 5 LPG 2E WHI BRN to Timer P1 5 LPG_ WHI from Power Cord to Hopper O IC RED to Left and Right Selector Switch LPG 2E Solenoid LPG 2E WHI BLU to Timer P1 4 LPG BLK to Power Cord LPG 7 105 FIG 16 OFF ON START SWITCH TERMINALS Viewed from rear Solenoid Model LPG 2E FIG 17 SOLENOIDS The solenoids are located inside the hopper hous ing behind the left and right side of the motor Test Procedure 1 Disconnect grinder from the power source 2 Remove both wires from the solenoid coil termi nals 3 Checkthe voltage across the red wire and the violet wire removed from the right solenoid or the red wire and the orange wire removed from the left 27091 111598 SERVICE cont Solenoid cont solenoid with a voltmeter Connect the grinder to the power source and place the Off On Start switch inthe center position The indication
22. t should be performed only by qualified service personnel electronic components have ac voltage and dc voltage potential on their terminals Shorting of terminals or the application of external voltages may result in board failure Intermittent operation of electronic circuit boards is unlikely Board failure will normally be permanent If an intermittent condition is encountered the cause will likely be a switch contact or a loose connection at a terminal or crimp e certain that all electrical connections are tight and isolated WARNING e Exercise extreme caution when servicing electrical equipment power OFF when servicing except when electrical tests are specified Follow recommended service procedures e Replace all protective shields or safety notices Problem Grinder will not start Probable Cause 1 No power or incorrect voltage 2 Off On Start switch 3 Circuit Breaker Not applicable on Model LPG with capacitor 4 Timer Remedy A Plug in the grinder B Check the voltage at the wall outlet with a voltmeter It must be 120 volts ac for 120 volt models 100 volts for 100 volt models and 230 volts for 230 volt models A Momentarily press the Off On Start switch to the START lower position B Refer to Service Off On Start switch for testing procedures See page 14 Press the Reset button located on rear of the grinder Listen carefully
23. ter set to read at least 120 volts DC along side the black wire terminal 7 of the harness plug and insert the negative lead along side the white black wire terminal 6 of the harness plug Place the Off On Start switch in the START lower position Connect the grinder to the power source The in dication must be 120 volts DC for the set gate time plus clean out time and return to 0 volts If voltage is present as described the timer is operat ing properly If Voltage is not present as described replace the timer Removal and Replacement 1 Disconnect the main wiring harness plug from the terminal block on the timer 2 Remove the two timer dial knobs located on the rear panel of the grinder 3 Remove nut and internal tooth lockwasher secur ing dials to the rear panel 4 Loosen the two 8 32 pan head screws securing the timer and timer mounting bracket to the motor support plate 5 Remove timer and timer mounting bracket from the grinder 6 Remove the four 6 32 keps nuts securing the timer to the mounting bracket Leave the four spacers on the mounting bracket studs 7 Place new timer over the studs on the mounting bracket and secure with four 6 32 keps nuts 27091 111598 SERVICE cont Timer Model LPG 2E 8 Slip timer and timer mounting bracket under the two screws on the motor support plate and tighten screws 9 Locate the left and right timer dials in their proper place on the rear panel an
24. the red wire to the circuit breaker and the red wire to the Off On Start switch On Model LPG disconnect the motor wiring harness from the main wiring harness 3 Connect the leads of an ohm meter to the red wires from the motor continuity is present the overload is good If continuity is not present the overload will not reset replace the motor 4 Set an ohm meter to read at least 20 ohms Connect the leads from the ohm meter to the black wire and the white from the motor The ohm reading should be approximately 18 ohms Using the bean agitator slowly rotate the motor shaft in approximately 1 8 turn steps through one full rotation If ohm readings are consistent motor windings are good If readings vary more than 1 ohm replace motor NOTE Clean all grind burrs and mounting surfaces before reassembly Removal and Replacement 1 Model LPG 2E disconnect the black wire and the white wire to the motor from the main wiring harness the red wire to the circuit breaker and the red wire to the Off On Start switch On Model LPG disconnect the motor wiring harness from the main wiring harness 2 On Model LPG 2E disconnect the red wire from the left and right solenoid the orange wire from the left solenoid and the violet wire from the right solenoid FIG 12 MOTOR REMOVAL 3 Refer to Fig 12 Remove the three 10 32 x 25 screws 1 securing the motor to the motor sup port bracket 4 Remove the motor solenoi
25. tor 100 volts for 100 volt mod els and 230 volts for 230 volt models for the set time and return to 0 volts 5 Disconnect the grinder from the power source If voltage is present as described the timer is operat ing properly If Voltage is not present as described replace the timer 27091 111598 WIRING SCHEMATICS SCHEMATIC WIRING DIAGRAM LPG2E GRN BLK 3 0 LAMP TIMER ASSY gt BLU Hopper Slide Gate Timer Wiring Right Brown Left Orange pe OFF ON START SWITCH RED eee 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ SELECTOR 27091 111598 SCHEMATIC WIRING DIAGRAM LPG 11 GREEN l1 w i a H ig Aan BLK RED P e WHI BLK 26 1 StWHIBLK AL 12 BLK gt lt tS WHI BLU 219 S WHI BLU TIMER WHI BRN gt WHI BRN WH 15 16 GRN 6 Cannes pg i BLK 5 fyi 15 5 WHI BRN lt 2 lt WHI BRN 9 i WHIBLU 55 3 WHI BLU 12 52 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ 27091 111598 WIRING SCHEMATICS SCHEMATIC WIRING DIAGRAM LPG A L2 GRN YEL g E K ig 3 0 D E am RED i R WHIBIK L BLK 0 131 BLK 70 2 WHI BLU WHUBRN 15 46 WHI BRN WHI BLK
26. ve the four 8 32 truss head screw securing the solenoid 4 to the solenoid mounting bracket P1059 FIG 18 SOLENOID REMOVAL AND INSTALLATION 3 Set mounting bracket 3 and the four screws aside for reassembly 6 Install new solenoid 4 on mounting bracket 3 using four 8 32 truss head screws 7 Slide new solenoid 4 and mounting bracket 3 on the solenoid plunger 5 far enough so the hole in the mounting bracket 3 is in line with the hole in the solenoid mounting plate 6 8 Install shoulder screw 2 9 Slide timer mounting bracket and timer 1 under the two 8 32 pan head screws on the left rear of the motor support and tighten screws Repeat steps 3 through 8 for the right solenoid Refer to Fig 19 and reconnect the wires to the solenoid coil terminals 10 11 RED FROM OFF ON START SWITCH RED FROM OFF ON START SWITCH VIO to Timer P1 9 ORA to Timer P1 10 ORA FIG 19 SOLENOID COIL TERMINALS 27091 111598 SERVICE cont Timer Model LPG 2E FIG 20 TIMER Location The timer is located inside the hopper housing just behind the left solenoid Test Procedure 1 Disconnect grinder from the power source 2 Insert the leads of a voltmeter set to read at least 120 volts AC along side the red wire terminal 8 and the white wire terminal 2 of the harness plug Place the Off On Start switch in the ON center position Connect the grinder to the po
27. wer source The indication must be 120 volts AC 3 Disconnect the grinder from the power source If voltage is present as described proceed to step 4 If voltage is not present as described refer to the wir ing diagram and check the grinder wiring harness 4 Place the hopper selector switch in the left posi tion 5 Insert the leads of a voltmeter set to read at least 120 volts AC along side the red wire terminal 8 and the orange wire terminal 10 of the harness plug Place the Off On Start switch in the START lower position Connect the grinder to the power source The indication must be 120 volts AC for the set gate time and return to 0 volts 6 Disconnect the grinder from the power source If voltage is present as described proceed to step 7 If voltage is not present as described replace the timer 7 Place the hopper selector switch in the right posi tion 8 Insert the leads of a voltmeter set to read at least 120 volts AC along side the red wire terminal 8 and the violet wire terminal 9 of the harness plug Place the Off On Start switch in the START lower position Connect the grinder to the power source The indication must be 120 volts AC for the set gate time and return to 0 volts 9 Disconnect the grinder from the power source If voltage is present as described proceed to step 10 If voltage is not present as described replace the timer 10 Insert the positive lead of a volt me
28. y Discard old motor and housing assembly cover 18 using two 8 32 flat head screws Install upper burr 16 to the new motor and housing assembly 17 using two 10 32 binding head screws Install spring retaining bushing 15 on motor shaft Refer to Fig 13 Install burr housing divider 8 in slot inthe burr housing and secure with 8 32 cup point setscrew 7 for Model LPG 2E only Refer to Fig 14 Install rotor 12 lower burr 13 and spring 14 as an assembly on the motor shaft Install load disc 11 flat side towards rotor Install burr housing cap 10 adjusting screw dechaffing spring plate and dechaffer support as an assembly to the new motor and housing as sembly 17 using two 10 32 fillister head screws Set motor upright with burr housing at the bottom NOTE Steps 32 thru 36 apply only to Model LPG 2E FIG 14 ROTOR AUGER BURRS AND MOTOR COVER 32 Install solenoids solenoid bracket and mounting 3 3 3 3 3 3 4 N ring 6 as an assembly on the new motor with the solenoids located to the opposite side of the burr housing divider 8 Install spacer plate 4 on burr housing divider 8 making sure the hole in the spacer plate 4 lines up with the hole in the mounting ring 6 Install solenoid plunger with spring and slide plate 3 as an assembly into the solenoid coil Place slide plate on the dowel in the mounting ring Repeat for the
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