Manuals / Bunn / Kitchen Appliance / Coffee Grinder

Bunn LPG-2, G9WD, G9-2T DBC, G1, FPG-2 Troubleshooting, Problem, Probable Cause, Remedy

Models: FPG-2 G1 FPG G9-2T DBC G9-2 G9 G9WD LPG-2

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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 Bunn-O-Matic Technical Service Department.

•Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.

•All electronic components have ac voltage and dc voltage potential on their terminals. Shorting of ter- minals 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.

•Make certain that all electrical connections are tight and isolated.

WARNING

•Exercise extreme caution when servicing electrical equipment.

•Turn power OFF when servicing, except when electrical tests are specified.

•Follow recommended service procedures.

•Replace all protective shields or safety notices.

Problem	Probable Cause	Remedy
Grinder will not start.	1. No power or incorrect voltage	(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.
	2. Off/On/Start switch	(A) Momentarily press the Off/On/
		Start switch to the “START” posi-
		tion.
		(B) Refer to Service - Off/On/Start
		switch for testing procedures.

3.Circuit Breaker (Not applicable on Model LPG with capacitor)

Press the “Reset” button, located on rear of the grinder. Listen carefully 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.

4. Timer	Refer to Service - Timer for testing
	procedures.

10	41545 122209

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Bunn LPG-2, G9WD, G9-2T DBC, G1, FPG-2 service manual Troubleshooting, Problem, Probable Cause, Remedy

Contents

GRINDERS BUNN-O-MATIC CORPORATIONSERVICE & REPAIR MANUAL Includes MHG, FPG FPG-2, LPG-2, G1, G2, G3 G2 trifecta, G9, G9WDBUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY CONTENTS INTRODUCTION RECOMMENDED DAILY CLEANINGCAPACITY CHART ADJUSTMENTSG9 WD - Packaging & Shim Removal MUST BE COMPLETED BY AUTHORIZED SERVICE PERSONNEL DO NOT PLUG INSEE INSTRUCTIONS BELOW BEFORE USING housing. FigureBatch Selector Switch Optional Off/On/Start SwitchHopper Selector Switch Dispense TimerModels G1, G2, G3 & G2 trifecta OPERATING CONTROLS ContinuedModel G9 Models LPG, LPG-2EOPERATING CONTROLS Continued Model MHG Power ON/OFF Pad e 100V ModelsModel G9-2T DBC Model FPG-2 DBC Batch Selector SwitchOPERATING CONTROLS Continued Model FPG PAD cProbable Cause TROUBLESHOOTINGProblem RemedyProbable Cause TROUBLESHOOTING contProblem RemedyProbable Cause ProblemRefer to Service - Snubber for re RemedyREMEDY PROBLEMPROBABLE CAUSE TROUBLESHOOTING contComponent Locations SERVICEComponent Access P602BAG SENSOR SWITCH Models G1, G2, G3 or SERVICE ContCUP SENSOR SWITCH MODEL G2 TRIFECTA AC MOTOR AND GRIND CHAMBER SERVICE ContAC MOTOR AND GRIND CHAMBER cont SERVICE ContAC MOTOR AND GRIND CHAMBER cont SERVICE ContFIG. 5 GRIND CHAMBER COMPONENTS SERVICE Cont DC MOTOR AND GRIND CHAMBER - G1MD ONLYDC MOTOR AND GRIND CHAMBER - G1MD ONLY cont SERVICE Cont12. Slide burr auger rotor/spring assembly and burr SERVICE ContDC MOTOR AND GRIND CHAMBER - G1MD ONLY cont SERVICE Cont MOTOR Models LPG & FPGFIG. 10 MOTOR REMOVAL MOTOR Models LPG & FPG SERVICE Cont8. Remove spacer plate 3 and set aside for reas- sembly 21. Discard old motor and housing assembly SERVICE ContMOTOR Models LPG & FPG FIG. 14 DECHAFFER REMOVAL/REPLACEMENT DECHAFFER Models LPG & FPGSERVICE Cont OPTONAL EXTRASERVICE Cont MOTOR Models G9, G9-2, MHGFIG. 15 MOTOR FIG. 16 MOTOR WIRINGNOTE Burrs must be replaced as a set FIG. 17 MOTOR AND GRIND CHAMBERReplace if excessively worn or damaged SERVICE ContSERVICE Cont SNUBBER Models G9, G9-2, MHGWHI/ BLU to Snubber LEVEL 2 FUNCTIONS Grinder Scale Model G9WD only CALIBRATIONSERVICE Cont SERVICE Cont Capacitor Model LPG onlyFIG. 20 CAPACITOR SERVICE Cont Circuit Breaker Models LPG, LPG-2E, FPG, FPG-2 DBCRED from Motor-LPG-2E BLK from Start Switch-LPG BLK from Power Cord FIG. 24 HOPPER SELECTOR SWITCH Hopper Selector Switch Model LPG-2E onlySERVICE Cont WHI to OFF/ON/START Switch BLU to Timer P1-4 bluSERVICE Cont Hopper Selector Switch Model G9-2 onlyFIG. 26 HOPPER SELECTOR SWITCH WHI/RED timer to P4-6 BLU to SW2 PNK to Intf conn SERVICE ContVIO to timer P1-2 BLK to Cordset BLK to timer P4-1 VIO to timer P1-2 BLK to Cordset WHI/RED timer to P4-6SERVICE Cont Urn/Carafe Switch Models G9, G9-2FIG 30 URN/CARAFE SWITCH SERVICE Cont Batch Selector Switch Model FPGORN to TIMER SERVICE Cont Potentiometer Model FPGFIG 34 POTENTIOMETERS SERVICE Cont Rectifier Models G1 MD, FPG-2 DBCFIG. 37 RECTIFIER TERMINALS Single set timer shown Relay Early Model G-9SERVICE Cont Multi set timer Urn/Carafe similarRelay Models G1, G2, G3, G2 trifecta SERVICE ContSERVICE Cont RELAY contFIG. 41 RELAY TERMINALS FIG 42 RELAY Relay Models MHG, FPG-2 DBC, Late Model G-9, G9-2, G9-2 DBCSERVICE Cont FIG 43 RELAY TERMINALSSERVICE Cont 5. Inspect the slide plates after reassembly. They must move freelyThe slide plates must always remain flat for proper operation Replace if excessively worn or damaged5. Inspect the slide plates after reassembly. They must move freely Hopper Slide Plates Models MHGSERVICE Cont The slide plates must always remain flat for proper operation7. Check the solenoid for coil action when the control Solenoids Models MHG, FPG-2 DBC, LPG-2, G9-2, G9-2 DBCSERVICE Cont press the Off/On/Start switch to “START” lowerSERVICE Cont Timer Model LPG-2EP1061 Timer Model LPG-2E Timer Models LPG, FPGSERVICE Cont P1748SERVICE Cont Timer Model G9If voltage is present as described, proceed to step SERVICE Cont Timer Model G9-2FIG 52 TIMER Digital TimerFIG 53 CONTROL BOARD Control Board Model MHGSERVICE Cont FIG 54 CONTROL BOARD TERMINALSSERVICE Cont FIG 55 CONTROL BOARDControl Board Models FPG-2 & G9-2 DBC TEST SWITCHES? NO YES PRESS RIGHT HIDDEN TO EXIT NOTHING PRESSED Membrane Switches Model MHG onlySERVICE Cont TEST FREQUENCY? NO YESSERVICE Cont FIG 58 MEMBRANE SWITCHMembrane Switches Models FPG-2 & G9-2 DBC SERVICE Cont EMI Filter Models FPG & FPG-2118.0 kΩ - 118.5 kΩ Across either pair FIG 62 FUNNEL SENSING COIL Funnel Sensing Coil Models MHG & G9-2 DBCSERVICE Cont FIG 63 FUNNEL SENSING COIL TERMINALSMEMORY BOARD Memory Clock Board Model MHGSERVICE Cont GRN WHI RED BLKFIG 66 DISPLAY BOARD Display Board Model MHGSERVICE Cont To Control Board J8TH1 & MOV2 TRIAC MAP for MHG@ J5-4,5,6 TH2 & MOV3TH2 & MOV2 TRIAC MAP for FPG-2 DBC and G9-2 DBCTH1 & MOV1 TH3 & MOV32 WIRE SINGLE PHASE 50/60 HZ SCHEMATIC WIRING DIAGRAMWIRING DIAGRAMS G9-2 DBC, G9-2T DBC W/SMART FUNNEL2 WIRE SINGLE PHASE 50/60 HZ SCHEMATIC WIRING DIAGRAMWIRING DIAGRAMS G9-2 DBC, G9-2T DBC W/SMART FUNNEL100 VOLTS AC 2 WIRE SINGLE PHASE 50 HZ SCHEMATIC WIRING DIAGRAM G9-2TB DBC W/SMART FUNNELWIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM MHG 2 WIRE SINGLE PHASE50/60 HZ WIRING DIAGRAMS100 VOLTS AC, 120 VOLTS AC 240 VOLTS AC 2 WIRE + Gnd SCHEMATIC WIRING DIAGRAM MHG with WD CBAWIRING DIAGRAMS SINGLE PHASE, 50/60HZWIRING DIAGRAMS SCHEMATIC WIRING DIAGRAMLPG-2E, LPGB-2E 100 VOLTS AC 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZWIRING DIAGRAMS WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM LPG 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZLPG-A WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM230 VOLTS AC 2 WIRE SINGLE PHASE 50/60 HZ WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM LPG W/Capacitor 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZWIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM LPG-B 100 VOLTS AC 2 WIRE SINGLE PHASE 50-60 HZ2 WIRE + GRD SINGLE PHASE 50/60 HZ WIRING DIAGRAMSSCHEMATIC WIRING DIAGRAM G1, G2, G3 & G2 trifecta 100 VOLT AC 120 VOLT AC 230 VOLT AC 240 VOLT AC120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ SCHEMATIC WIRING DIAGRAM G9SCHEMATIC WIRING DIAGRAM G9-URN/CARAFE 2 WIREWIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM G9A HD50 HZ SCHEMATIC WIRING DIAGRAM G9WD-RHWIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM G9SCHEMATIC WIRING DIAGRAM G9 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZSCHEMATICWIRINGDIAGRAMG9-2A HD 230 VOLTS AC 2 WIRE SINGLE PHASE 50 HZWIRING DIAGRAMS WIRING DIAGRAMS 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ FPGAWIRING DIAGRAMS 230 VOLTS AC 2 WIRE SINGLE PHASE 50/60 HZFPG-2 DBC, FPGB-2 DBC 100 VOLTS AC 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZWIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM50 HZ FPG-2A DBC230 VOLTS AC SCHEMATIC WIRING DIAGRAM