SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
GRINDERS
Includes MHG, FPG FPG-2, LPG-2, G1, G2, G3 G2 trifecta, G9, G9WD
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
CONTENTS
CAPACITY CHART
RECOMMENDED DAILY CLEANING
INTRODUCTION
ADJUSTMENTS
SEE INSTRUCTIONS BELOW BEFORE USING
MUST BE COMPLETED BY AUTHORIZED SERVICE PERSONNEL DO NOT PLUG IN
G9 WD - Packaging & Shim Removal
housing. Figure
Hopper Selector Switch
Off/On/Start Switch
Batch Selector Switch Optional
Dispense Timer
Model G9
OPERATING CONTROLS Continued
Models G1, G2, G3 & G2 trifecta
Models LPG, LPG-2E
OPERATING CONTROLS Continued Model MHG
Power ON/OFF Pad e 100V Models
Model G9-2T DBC
OPERATING CONTROLS Continued Model FPG
Batch Selector Switch
Model FPG-2 DBC
PAD c
Problem
TROUBLESHOOTING
Probable Cause
Remedy
Problem
TROUBLESHOOTING cont
Probable Cause
Remedy
Refer to Service - Snubber for re
Problem
Probable Cause
Remedy
PROBABLE CAUSE
PROBLEM
REMEDY
TROUBLESHOOTING cont
Component Access
SERVICE
Component Locations
P602
BAG SENSOR SWITCH Models G1, G2, G3 or
SERVICE Cont
CUP SENSOR SWITCH MODEL G2 TRIFECTA
SERVICE Cont
AC MOTOR AND GRIND CHAMBER
SERVICE Cont
AC MOTOR AND GRIND CHAMBER cont
AC MOTOR AND GRIND CHAMBER cont
SERVICE Cont
FIG. 5 GRIND CHAMBER COMPONENTS
DC MOTOR AND GRIND CHAMBER - G1MD ONLY
SERVICE Cont
SERVICE Cont
DC MOTOR AND GRIND CHAMBER - G1MD ONLY cont
12. Slide burr auger rotor/spring assembly and burr
SERVICE Cont
DC MOTOR AND GRIND CHAMBER - G1MD ONLY cont
SERVICE Cont
MOTOR Models LPG & FPG
FIG. 10 MOTOR REMOVAL
MOTOR Models LPG & FPG
SERVICE Cont
8. Remove spacer plate 3 and set aside for reas- sembly
21. Discard old motor and housing assembly
SERVICE Cont
MOTOR Models LPG & FPG
SERVICE Cont
DECHAFFER Models LPG & FPG
FIG. 14 DECHAFFER REMOVAL/REPLACEMENT
OPTONAL EXTRA
FIG. 15 MOTOR
MOTOR Models G9, G9-2, MHG
SERVICE Cont
FIG. 16 MOTOR WIRING
Replace if excessively worn or damaged
FIG. 17 MOTOR AND GRIND CHAMBER
NOTE Burrs must be replaced as a set
SERVICE Cont
SERVICE Cont
SNUBBER Models G9, G9-2, MHG
WHI/ BLU to Snubber
LEVEL 2 FUNCTIONS
Grinder Scale Model G9WD only CALIBRATION
SERVICE Cont
SERVICE Cont
Capacitor Model LPG only
FIG. 20 CAPACITOR
SERVICE Cont
Circuit Breaker Models LPG, LPG-2E, FPG, FPG-2 DBC
RED from Motor-LPG-2E BLK from Start Switch-LPG BLK from Power Cord
SERVICE Cont
Hopper Selector Switch Model LPG-2E only
FIG. 24 HOPPER SELECTOR SWITCH
WHI to OFF/ON/START Switch BLU to Timer P1-4 blu
SERVICE Cont
Hopper Selector Switch Model G9-2 only
FIG. 26 HOPPER SELECTOR SWITCH
VIO to timer P1-2 BLK to Cordset BLK to timer P4-1
SERVICE Cont
WHI/RED timer to P4-6 BLU to SW2 PNK to Intf conn
VIO to timer P1-2 BLK to Cordset WHI/RED timer to P4-6
SERVICE Cont
Urn/Carafe Switch Models G9, G9-2
FIG 30 URN/CARAFE SWITCH
SERVICE Cont
Batch Selector Switch Model FPG
ORN to TIMER
SERVICE Cont
Potentiometer Model FPG
FIG 34 POTENTIOMETERS
SERVICE Cont
Rectifier Models G1 MD, FPG-2 DBC
FIG. 37 RECTIFIER TERMINALS
SERVICE Cont
Relay Early Model G-9
Single set timer shown
Multi set timer Urn/Carafe similar
SERVICE Cont
Relay Models G1, G2, G3, G2 trifecta
SERVICE Cont
RELAY cont
FIG. 41 RELAY TERMINALS
SERVICE Cont
Relay Models MHG, FPG-2 DBC, Late Model G-9, G9-2, G9-2 DBC
FIG 42 RELAY
FIG 43 RELAY TERMINALS
The slide plates must always remain flat for proper operation
5. Inspect the slide plates after reassembly. They must move freely
SERVICE Cont
Replace if excessively worn or damaged
SERVICE Cont
Hopper Slide Plates Models MHG
5. Inspect the slide plates after reassembly. They must move freely
The slide plates must always remain flat for proper operation
SERVICE Cont
Solenoids Models MHG, FPG-2 DBC, LPG-2, G9-2, G9-2 DBC
7. Check the solenoid for coil action when the control
press the Off/On/Start switch to “START” lower
SERVICE Cont
Timer Model LPG-2E
P1061
SERVICE Cont
Timer Models LPG, FPG
Timer Model LPG-2E
P1748
SERVICE Cont
Timer Model G9
If voltage is present as described, proceed to step
FIG 52 TIMER
Timer Model G9-2
SERVICE Cont
Digital Timer
SERVICE Cont
Control Board Model MHG
FIG 53 CONTROL BOARD
FIG 54 CONTROL BOARD TERMINALS
SERVICE Cont
FIG 55 CONTROL BOARD
Control Board Models FPG-2 & G9-2 DBC
SERVICE Cont
Membrane Switches Model MHG only
TEST SWITCHES? NO YES PRESS RIGHT HIDDEN TO EXIT NOTHING PRESSED
TEST FREQUENCY? NO YES
SERVICE Cont
FIG 58 MEMBRANE SWITCH
Membrane Switches Models FPG-2 & G9-2 DBC
SERVICE Cont
EMI Filter Models FPG & FPG-2
118.0 kΩ - 118.5 kΩ Across either pair
SERVICE Cont
Funnel Sensing Coil Models MHG & G9-2 DBC
FIG 62 FUNNEL SENSING COIL
FIG 63 FUNNEL SENSING COIL TERMINALS
SERVICE Cont
Memory Clock Board Model MHG
MEMORY BOARD
GRN WHI RED BLK
SERVICE Cont
Display Board Model MHG
FIG 66 DISPLAY BOARD
To Control Board J8
@ J5-4,5,6
TRIAC MAP for MHG
TH1 & MOV2
TH2 & MOV3
TH1 & MOV1
TRIAC MAP for FPG-2 DBC and G9-2 DBC
TH2 & MOV2
TH3 & MOV3
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM
2 WIRE SINGLE PHASE 50/60 HZ
G9-2 DBC, G9-2T DBC W/SMART FUNNEL
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM
2 WIRE SINGLE PHASE 50/60 HZ
G9-2 DBC, G9-2T DBC W/SMART FUNNEL
100 VOLTS AC 2 WIRE SINGLE PHASE 50 HZ
SCHEMATIC WIRING DIAGRAM G9-2TB DBC W/SMART FUNNEL
WIRING DIAGRAMS
50/60 HZ
2 WIRE SINGLE PHASE
SCHEMATIC WIRING DIAGRAM MHG
WIRING DIAGRAMS
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM MHG with WD CBA
100 VOLTS AC, 120 VOLTS AC 240 VOLTS AC 2 WIRE + Gnd
SINGLE PHASE, 50/60HZ
LPG-2E, LPGB-2E
SCHEMATIC WIRING DIAGRAM
WIRING DIAGRAMS
100 VOLTS AC 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ
WIRING DIAGRAMS
120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM LPG
LPG-A
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM
230 VOLTS AC 2 WIRE SINGLE PHASE 50/60 HZ
120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM LPG W/Capacitor
100 VOLTS AC 2 WIRE SINGLE PHASE 50-60 HZ
WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM LPG-B
SCHEMATIC WIRING DIAGRAM G1, G2, G3 & G2 trifecta
WIRING DIAGRAMS
2 WIRE + GRD SINGLE PHASE 50/60 HZ
100 VOLT AC 120 VOLT AC 230 VOLT AC 240 VOLT AC
SCHEMATIC WIRING DIAGRAM G9-URN/CARAFE
SCHEMATIC WIRING DIAGRAM G9
120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ
2 WIRE
50 HZ
SCHEMATIC WIRING DIAGRAM G9A HD
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM G9WD-RH
SCHEMATIC WIRING DIAGRAM G9
SCHEMATIC WIRING DIAGRAM G9
WIRING DIAGRAMS
120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ
SCHEMATICWIRINGDIAGRAMG9-2A HD
230 VOLTS AC 2 WIRE SINGLE PHASE 50 HZ
WIRING DIAGRAMS
WIRING DIAGRAMS
WIRING DIAGRAMS
FPGA
120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ
230 VOLTS AC 2 WIRE SINGLE PHASE 50/60 HZ
WIRING DIAGRAMS
100 VOLTS AC 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ
FPG-2 DBC, FPGB-2 DBC
SCHEMATIC WIRING DIAGRAM
230 VOLTS AC
FPG-2A DBC
50 HZ
SCHEMATIC WIRING DIAGRAM