Bunn G2 TRIFECTA User Manual
GRINDERS
Includes: MHG, FPG,
FPG-2, LPG-2, G1, G2, G3,
G2 trifecta™, G9, G9WD,
G9-2 & G9-2T DBC
SERVICE & REPAIR MANUAL
BUNN-O-MATIC CORPORATION
POST OFFICE BOX 3227
SPRINGFIELD, ILLINOIS 62708-3227
PHONE: (217) 529-6601 FAX: (217) 529-6644
To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts
Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at
www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and
manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.
41545.0000C 11/11 ©2009 Bunn-O-Matic Corporation
BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY
Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:
1) All equipment other than as specified below: 2 years parts and 1 year labor.
2) Electronic circuit and/or control boards: parts and labor for 3 years.
3) Compressors on refrigeration equipment: 5 years parts and 1 year labor.
4) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis:
parts and labor for 3 years or 30,000 pounds of coffee, whichever comes first.
These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by
it will be commercially free of defects in material and workmanship existing at the time of manufacture and
appearing within the applicable warranty period. This warranty does not apply to any equipment, component or
part that was not manufactured by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect,
alteration, improper installation or operation, improper maintenance or repair, damage or casualty. This warranty is
conditioned on the Buyer 1) giving 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; 2) if requested by
BUNN, shipping the defective equipment prepaid to an authorized BUNN service location; and 3) receiving prior
authorization from BUNN that the defective equipment is under warranty.
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 warranties that are binding on
BUNN. Accordingly, statements by such individuals, whether oral or written, do not constitute warranties and
should not be relied upon.
If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its
exclusive option while the equipment is under warranty, shall either 1) provide at no charge replacement parts
and/or labor (during the applicable parts and labor warranty periods specified above) to repair the defective
components, provided that this repair is done by a BUNN Authorized Service Representative; or 2) shall 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, AT BUNN’S
SOLE OPTION AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.
In no event shall BUNN be liable for any other damage or 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.
392, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, BrewWISE, BrewWIZARD, BUNN Espress, BUNN
Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with the stylized red line, BUNNlink, Bunn-OMatic,
Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design, Cool Froth, DBC, Dr. Brew stylized Dr. design,
Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, Phase Brew, PowerLogic, Quality Beverage Equipment Worldwide, Respect Earth, Respect Earth with
the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com, Scale-Pro, Silver Series, Single, Smart Funnel,
Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in Beverage Equipment Worldwide, ThermoFresh,
Titan, trifecta, Velocity Brew, A Partner You Can Count On, Air Brew, Air Infusion, Beverage Bar Creator, Beverage Profit
Calculator, Brew better, not bitter., BUNNSource, Coffee At Its Best, Cyclonic Heating System, Daypart, Digital Brewer
Control, Nothing Brews Like a BUNN, Pouring Profits, Signature Series, Tea At Its Best, The Horizontal Red Line, Ultra are
either trademarks or registered trademarks of Bunn-O-Matic Corporation.
2
41545 092611
CONTENTS
Warranty and Trademark .................................................................................................3
Introduction ....................................................................................................................4
Recommended Daily Cleaning ........................................................................................4
G9WD Packaging & Shim Removal ................................................................................5
Operating Controls ..........................................................................................................6
Troubleshooting ............................................................................................................10
Service ..........................................................................................................................14
Component Access ...........................................................................................14
Bag Sensor .......................................................................................................15
Motor and Grind Chamber ................................................................................16
Capacitor ...........................................................................................................30
Circuit Breaker ..................................................................................................31
Hopper Selector Switch ....................................................................................32
Off/On/Start Switch ...........................................................................................34
Urn/Carafe Selector Switch ...............................................................................35
Batch Selector Switch .......................................................................................36
Potentiometer ...................................................................................................37
Rectifier ............................................................................................................38
Relay .................................................................................................................39
Hopper Slide Plates ...........................................................................................43
Solenoid ............................................................................................................45
Timer ................................................................................................................46
Control Board ....................................................................................................50
Membrane Switch .............................................................................................52
EMI Filter ...........................................................................................................54
Funnel Sensing Coil ..........................................................................................55
Memory Clock Board ........................................................................................56
Display Board ....................................................................................................57
Wiring Schematics
........................................................................................................58
3
41545 111711
INTRODUCTION
The Grinder will store various amounts of whole bean coffee and grind it to a preset grind and amount into
an awaiting funnel and filter or French Press 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 from the factory setting. Refer to the Installation & Operating Manuals for
ADJUSTMENTS.
RECOMMENDED DAILY CLEANING
The use of a damp cloth rinsed in any mild, nonabrasive, liquid detergent is recommended for cleaning all
surfaces on 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. Refer to the Installation &
Operating Manuals for CLEANING.
CAPACITY CHART
FPG, LPG ................................Six pounds
FPG-2 ......................................Three pounds in each hopper
MHG ........................................Five pounds in each hopper
G9 ...........................................Nine pounds
G9-2, G9-2T DBC ....................Six pounds in each hopper
G9WD .....................................Five pounds
G1 ...........................................One pound
G2 ...........................................Two pounds
G3 ...........................................Three pounds
G2 trifecta ...............................Two pounds
4
41545 072710
G9 WD - Packaging & Shim Removal
WARNING
MUST BE COMPLETED BY AUTHORIZED SERVICE PERSONNEL.
DO NOT PLUG IN !
SEE INSTRUCTIONS BELOW BEFORE USING !
Step 1 - Remove & discard tape holding funnel arm in place. (Figure 1)
Step 2 - Remove & discard two silicon tubes between funnel guide &
housing. (Figure 2)
Step 3 - Remove four screws in front housing panel. (Figure 3)
Step 4 - Remove & discard shim under transducer. (Figure 4)
Step 5 - Replace housing panel and secure four screws. (Figure 3)
Figure 1
Figure 3
5
Figure 2
Figure 4
41545 111711
OPERATING CONTROLS
Model G9WD
d
c
Grind Pad (a)
Pressing initiates a grind cycle.
Stop Pad (b)
Pressing ends the operation of the grinder.
e
® Pad (c)
Pressing the copyright pad allows programming access.
a
Pads (d)
“Hidden” buttons used to navigate setup and programming menus.
Pads (e)
Press button to select small, medium or large batch size.
Model G9-2
Off/On/Start Switch
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 grind cycle has begun and will remain
in this position after grinding has ceased.
START - (lower, momentary position) Pressing the switch initiates a timed grind cycle.
b
Hopper Selector Switch
Left - Switching to this position allows beans to be dispensed from the
left hopper.
Right - Switching to this position allows beans to be dispensed from the
right hopper.
Batch Selector Switch (Optional)
Urn - Switching to this position allows the correct amount of beans to be
dispensed when grinding a large batch.
CARAFE - Switching to this position allows the correct amount of beans
to be dispensed when grinding a small batch.
P633
Dispense Timer
The dispense timer controls the amount of beans that will leave the hopper in a grind cycle. The timer can
be adjusted to dispense a different amount from each hopper. The scale is from 0.4 to 150.0 seconds. Refer to
the Installation & Operating Manuals for Adjustments.
6
41545 111711
URN
O
F
F
S
T
A
R
T
ON
CARAFE
OPERATING CONTROLS (Continued)
Model G9
Off/On/Start Switch
OFF - (left position)
Placing the switch in this position stops the operation of the grinder.
ON - (center, resting position)
The switch will return to this position after a grind cycle has begun and will remain in this
position after grinding has ceased.
START - (right, momentary position)
P1300
Placing the switch in this position initiates a timed grind cycle.
Batch Selector Switch (Optional)
URN - Switching to this position allows the correct amount of beans to be dispensed when grinding a large batch.
CARAFE - Switching to this position allows the correct amount of beans to be dispensed when grinding a small
batch.
Models G1, G2, G3 & G2 trifecta
Off/On/Start Switch
OFF - (upper position)
Switching to this position stops the operation of the grinder.
ON - (center, resting position)
The switch will return to this position after a grind cycle has begun and will remain in this position after grinding has ceased.
START - (lower, momentary position)
Pressing the switch initiates grinding only when a bag is in place behind the chute.
Grind Selector
Allows the user to vary the grind for each bag of coffee. Each setting will provide precisely the same grind every time it is
selected.
Bag Sensor
Prevents the grinder from operating unless the back of a bag is in place behind the dispense chute.
Do not attempt to bypass this safety device.
Models LPG, LPG-2E
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 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.
P1028
7
P1029
41545 111711
OPERATING CONTROLS (Continued)
Model MHG
c
Grind Pad (a)
Pressing initiates a timed grind cycle.
d
d
Stop Pad (b)
Pressing ends the operation of the grinder.
® PAD (c)
a
b
Pressing the ® pad allows programming access.
Hopper/Batch Selector Pads (d)
These pads are located on the funnel depictions on each side of the grinder with a total of 6 pads. Selecting one
of these pads will select the amount of grind and side from which to grind.
Example: Selecting the lower pad on the left side will grind enough beans from the left hopper of the grinder to
brew the amount programmed into grinder.
Control Board
The control board determines the amount of beans that will leave the hopper in a grind cycle. The timer portion
can be adjusted to dispense a different amount from each hopper and each batch size. The scale is from 0.4 to
99.9 seconds. Refer to the Installation & Operating Manuals for Adjustments.
c
Model G9-2T DBC
Grind Pad (a)
Pressing initiates a timed grind cycle.
Stop Pad (b)
Pressing ends the operation of the grinder.
® PAD (c)
Pressing the ® pad allows programming access.
Hopper/Batch Selector Pads (d)
These pads are located on the funnel depictions on each side of the grinder with a total of 6 pads. Selecting one
of these pads will select the amount of grind and side from which to grind.
Example: Selecting the lower pad on the left side will grind enough beans from the left hopper of the grinder to
brew the amount programmed into grinder.
Power ON/OFF Pad (e) (100V Models)
Pressing the ON/OFF pad alternately turns the grinder on and off.
Control Board
The control board determines the amount of beans that will leave the hopper in a grind cycle. The timer portion
can be adjusted to dispense a different amount from each hopper and each batch size. The scale is from 0.4 to
99.9 seconds. Refer to the Installation & Operating Manuals for Adjustments.
d
d
a
b
e
8
41545 122209
OPERATING CONTROLS (Continued)
Model FPG
Off/On/Start Switch
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 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.
Batch Selector Switch
Select Small, Medium or Large batch by turning the round selector knob
on the left front of the grinder.
Model FPG-2 DBC
Grind Pad (a)
Pressing GRIND initiates a timed grind cycle.
Stop Pad (b)
Pressing STOP ends the operation of the grinder.
® PAD (c)
Pressing the ® pad allows programming access
(see page 5).
d
a
P2947
P2947
c
d
b
Hopper/Batch Selector Pads (d)
These pads are located on the funnel depictions on each side of the grinder with a total of 6 pads. Selecting
one of these pads will select the amount of grind and side from which to grind.
Example: Selecting the lower pad on the left side will grind enough beans from the left side of the grinder
to brew the amount programmed into grinder.
Control Board
The control board determines the amount of beans that will leave the hopper in a grind cycle. The timer por-
tion can be adjusted to dispense a different amount from each hopper and each batch size. The scale is from 0.4
to 99.9 seconds. Refer to the Installation & Operating Manuals for Adjustments.
9
41545 122209
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, andrepair ofelectrical equipmentshould beperformedonly byqualied service
personnel.
• Allelectroniccomponentshaveacvoltageanddcvoltagepotentialontheirterminals.Shortingofterminals or the application of external voltages may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.
If an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection
at a terminal or crimp.
• Makecertainthatallelectricalconnectionsaretightandisolated.
WARNING
• Exerciseextremecautionwhenservicingelectricalequipment.
• TurnpowerOFFwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures.
• Replaceallprotectiveshieldsorsafetynotices.
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)
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” position.
(B) Refer to Service - Off/On/Start
switch for testing procedures.
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 encountered 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
10
Refer to Service - Timer for testing
procedures.
41545 122209
TROUBLESHOOTING (cont.)
Problem
Grinder will not start. (Continued)
Probable Cause
5. Motor
6. Relay
7. Bag sensor or Cup Sensor
Remedy
Each motor is equipped with a
temperature and current overload
protection 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.
Refer to Service - Relay for testing
procedures.
(A) The receiving bag must be placed
on the tray screen and have the back
of the bag behind the dispense chute
to activate the sensor switch.
(B) Refer to Service - Bag Sensor
Switch for testing and adjustment
procedures.
Grinder will not shut off.
1. Off/On/Start switch
2. Timer
3. Relay
4. Bag Sensor or Cup Sensor
(A) Place the switch in the “OFF”
upper position.
(B) Refer to Service - Off/On/Start
Switch for testing procedures.
Refer to Service - Timer for testing
procedures.
Refer to Service - Relay for testing
procedures.
(A) Remove bag from under the
dispense chute.
(B) Refer to Service - Bag Sensor
Switch for testing procedures.
11
41545 072710
Problem Probable Cause Remedy
Grinder starts, but will not dispense
from hopper.
1. Hopper(s)
2. Blockage of hopper(s)
3. Slide Gate Solenoids (Model LPG2E only)
4. Timer
5. Off/On/Start switch
6. Slide plates
Begin each grind cycle by visually
inspecting the hopper(s) for ample
supplies of whole bean coffee.
Foreign materials must not block
the openings at the bottom of the
hopper(s).
Refer to Service - Solenoids for testing procedures.
Refer to Service - Timer for testing
procedures.
Refer to Service - Off/On/Start
switch for testing procedures.
(A) Check to see that the slide plates
move freely to allow beans to travel
into the grind chamber.
Incorrect amount of coffee.
7. Solenoids
8. Solenoid Limit Thermostat
9. Shear Plate
1. Timer adjustment
2. Snubber
(B) Refer to Service -Slide Plates for
testing procedures.
Refer to Service - Solenoids for testing procedures.
Refer to Service - Solenoids for testing procedures.
Remove both black fillister head
screws holding the grinder selector
dial plate to the grinder. Carefully
remove the dial plate and rotor cup.
Inspect the shear plate for wear.
Replace if excessively worn or damaged.
Refer to the Adjustment section
in the Installation and Operation
Manual.
Refer to Service - Snubber for replacement procedures.
12
41545 122209
TROUBLESHOOTING (cont.)
PROBLEM
Incorrect coffee grind dispensed.
Excessive chaff
Grinder only dispenses from one
hopper
Timer will not display or displays
incorrectly.
Incorrect weight of coffee dispensed
PROBABLE CAUSE
1. Burr adjustment
1. Dechaffer
1. Hopper selector switch (Model
LPG-2E only)
1. Digital Timer
1. Grinder scale requires calibration.
REMEDY
Refer to the Adjustment section
in the Installation and Operation
Manual.
Replace the dechaffer springs.
Replacement dechaffer springs are
provided in the literature package
accompnting the grinder.
Refer to Service - Hopper selector
switch for testing procedures.
(A) Unplug the grinder. Wait a few
seconds and plug it in again.
(B) Refer to Service - Timer for test-
ing procedures.
Refer to GRINDER SCALE CALIBRATION procedure.
2. Funnel handle touched during
grinding.
Do not touch funnel or funnel handle during grinding operation.
13
41545 072710
SERVICE
PERSONAL INJURY
HAZARD.
KEEP FINGERS AND
FOREIGN OBJECTS
OUT OF HOPPER
OR CHUTE OPENING.
CAUTION
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 electrical equipment should be performed only by qualified
service personnel. The grinder should be unplugged
when servicing, except when electrical tests are required 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
lid, hopper, or front and rear access panels. Mark and
retain all screws,washers and nuts for installation.
P1306
Component Locations
Some pictures showing component locations may be
general to all grinders unless the component is specific
to your model.
P602
P1307
P1308
P603
14
41545 122209
SERVICE (Cont.)
BAG SENSOR SWITCH (Models G1, G2, G3) or
CUP SENSOR SWITCH (MODEL G2 TRIFECTA)
P1704
FIG. 1 BAG SENSOR SWITCH
Location:
The bag sensor switch is located inside the lower
front of the grinder housing behind the coffee dispensing chute.
Test Procedure:
1. Disconnect the grinder and place a coffee bag
behind the dispense chute.
2. Remove the white/violet wire from the bag sensor
switch.
3. Check the voltage across the white/violet wire
from the bag sensor switch and the white wire,
red/black wire or red wire on the relay coil with
a voltmeter. Hold the Off/On/Start switch in the
“START” (lower) position and connect the grinder
to the power source. The indication must be:
a. 120 volts ac for two wire 120 volt models.
b. 230 volts ac for two wire 230 volt models.
c. 240 volts ac for two wire 240 volt models.
4. Disconnect the grinder from the power source.
If voltage is present as described, proceed to
#5.
If voltage is not present as described, refer to the
Wiring Diagrams and check the grinder wiring
harness.
5. Check for continuity across the terminals on the
bag sensor switch.
If continuity is present as described, reconnect the
wires, the switch is operating properly.
If continuity is not present as described, replace the
switch.
Removal and Replacement:
1. Remove the wires from the switch.
2. Remove the two #8-32 keps nuts securing the bag
sensor assembly to the grinder housing.
3. Remove the two #2-56 screws, nuts and external
tooth lockwashers securing the switch to the bag
sensor assembly.
4. Mount the new switch to the bag sensor assembly
using two #2-56 screws, nuts and external tooth
lockwashers. Adjust the assembly by locating the
corner of the switch housing to the top edge of
the black metal mounting bracket.
5. Reattach the sensor assembly to the grinder housing and secure with two #8-32 keps nuts.
6. Refer to Fig. 2 when reconnecting the wires.
WHI/VIO from
Off/On/Start
Switch
WHI/ORA to
Terminal “A”
on Relay
P1705
FIG. 2 BAG SENSOR SWITCH TERMINALS
15
41545 072710
SERVICE (Cont.)
AC MOTOR AND GRIND CHAMBER
P1704
FIG. 3 AC MOTOR AND GRIND CHAMBER
Location:
The motor is located inside the upper part of the
grinder housing.
Test Procedure:
1. Remove the plug located on the right side of the
housing. Press the red “Reset” button visible
through the opening. Listen carefully for a “click”.
This resets the motor protection circuit and may
indicate that something other than coffee was
inserted into the hopper for grinding.
If the grinder remains unable to start, proceed to #2.
If the grinder stops operating shortly after starting, refer
to removal and replacement instructions and inspect
for foreign materials.
2. Disconnect the grinder from the power source and
place a coffee bag behind the dispense chute.
3. Remove the electrical access panel at the rear of
the motor.
4. Check the voltage across the white, red or red/
black and white/blue wires on terminals L1 & L2
with a voltmeter. Connect the grinder to the power
source. When the Off/On/Start switch is momentarily placed in the “START” (lower) position and
then left in the “ON” (center) position and a bag
is in place behind the coffee dispense chute.
The indication must be:
a. 120 volts ac for two wire 120 volt models.
b. 230 volts ac for two wire 230 volt models
c. 240 volts ac for two wire 240 volt models.
5. Disconnect the grinder from the power source.
If voltage is present as described replace the motor.
If voltage is not present as described, reconnect the
white, red or red/black and white/blue wires to the motor, refer to the Wiring Diagrams and check the grinder
wiring harness.
Removal and Replacement - Motor (Refer to FIG.6):
1. Remove the plate on the rear of the motor and
disconnect all wires from the motor.
2. Remove the two .250”-20 screws (1) securing
grind selector dial plate and grind selector knob
(2) to the grind chamber. Remove dial plate and
selector knob as an assembly.
3. Slide burr (7), auger rotor/spring assembly (3),
shear plate (4) and burr rotor cup (5) off the
grinder motor shaft as an assembly.
4. Remove the two .250”-20 screws (8) securing the
stationary burr (9) to the grind chamber.
5. Remove bushing (10) and shaft extension (11)
from the grinder motor shaft.
6. Remove the two #8 thread forming screws (12)
securing the fill plate (13) to grinder housing and
remove plate (13).
7. Remove the four #10-24 screws (14) securing the
chute assembly (15) to the grind chamber and
remove chute assembly (15).
8. Remove the four .250”-20 screws, flat washer and
rubber washers securing the motor to the mounting bracket.
9. Remove motor out the rear of the grinder housing.
10. Remove the four .250”-20 cage nuts from the
motor mount.
16
41545 122209
SERVICE (Cont.)
AC MOTOR AND GRIND CHAMBER (cont.)
11. Clean all grinding burrs and mounting surfaces
before reassembly.
12. Install the four .250”-20 cage nuts on the new
motor.
13. Place the new motor with hopper collar and bushing into position on the bushings on the motor
mounting bracket.
14. Using four .250”-20 screws, flat washers and
rubber washers secure the motor to the mounting
bracket.
15. Install stationary burr (9) to the grind chamber
housing using two .250”-20 screws.
16. Install burr (7) and burr auger rotor/spring assembly (3) on to motor shaft.
17. Install motor shaft extension (11) on motor
shaft.
18. Align the slot in the motor shaft extension (11) with
the slot in the burr auger rotor/spring assembly
(6) and install shear plate (4).
19. Install burr rotor cup (5).
20. Install grind selector dial plate and grind selector
knob assembly on the grind chamber housing and
secure with two .250”-20 screws.
21. Refer to Fig. 4 and reconnect the wires.
22. Refer to ADJUSTMENTS in the Installation and
Operating Manual, and reset the burrs.
WHI/BLU to
Relay N.O.(K4)
WHI to Cordset (120V)
RED/BLK to Cordset (230V)
GRN to Ground (120V)
GRN/YEL to Ground (230V)
FIG. 4 AC MOTOR TERMINALS
P1310
17
41545 122209
SERVICE (Cont.)
AC MOTOR AND GRIND CHAMBER (cont.)
18 1 19 17
20 7 6 4 5
11 10 9 8 3
14
13
15
7
12
FIG. 5 GRIND CHAMBER COMPONENTS
Removal and Replacement - Grind Chamber - Fig. 5:
1. Loosen the two set screws (16) securing the grind
selector knob to the grind selector dial plate (18) and
remove knob.
2. Remove the adjusting screw w/bearing (19). Inspect
adjusting screw w/bearing for wear. Replace if excessively worn or damaged.
3. Remove the two .250”-20 screws (1) securing the grind
selector dial plate (18) to the grind housing.
4. Slide burr auger rotor/spring assembly (3) off of the
grinder motor shaft with burr rotor cup (5), shear plate
(4) and burr (7) as an assembly.
5. Remove burr rotor cup (5) and shear plate (4) from burr
auger rotor/spring assembly (6). Inspect shear plate (4)
for wear. Replace if excessively worn or damaged.
6. Remove the two .250” screws (20) securing burr (7) to
burr auger rotor/spring assembly (6) and remove burr
(7). Inspect burr (7) for wear. Replace if excessively
worn or damaged.
7. Remove the two .250”-20 screws (8) securing the stationary burr (9) to grind chamber housing and remove
burr. Inspect for wear. Replace if excessively worn or
damaged.
NOTE: Burrs are serviced in sets of two with hardware.
8. Clean all grinding burrs and mounting surfaces before
reassembly.
2 1
9. Remove bushing (10) and shaft extension (11) from
grinder motor shaft. Inspect for wear. Replace if excessively worn or damaged.
10. Install shaft extension (11) and bushing (10) onto the
grinder motor shaft.
11. Install stationary burr (9) inside the grind chamber and
secure with two .250” -20 screws (8).
12. Install burr (7) on burr auger rotor/spring assembly (6)
securing with two .250”-20 screws (20).
13. Slide burr auger rotor/spring assembly and burr (3)
onto the motor shaft.
14. Align the slot in the shaft extension and the slot in the
burr auger rotor/spring assembly and install shear plate
(4).
15. Install burr rotor cup (5) onto the burr auger rotor/spring
assembly (6).
16. Install the adjusting screw w/bearing (19) into the grind
selector dial plate (18).
17. Install grind selector dial plate (18) with adjusting screw
w/bearing (19) onto the grind chamber and secure with
two .250”-20 screws (1).
18. Install grind selector knob (17) onto the grind selector
dial plate (18).
NOTE: Refer to ADJUSTMENTS in the Installation and Op-
erating Manual, and reset the burrs.
16
P1708
18
41545 122209
SERVICE (Cont.)
DC MOTOR AND GRIND CHAMBER - G1MD ONLY
P1706
FIG. 6 DC MOTOR AND GRIND CHAMBER
Location:
The motor is located inside the upper part of the grinder
housing.
Test Procedures:
1. Remove the rear panel. Press the red “Reset”
button visible on the rear of the motor. Listen carefully for a “click”. This resets the motor protection
circuit and may indicate that something other than
coffee was inserted into the hopper for grinding.
If the grinder remains unable to start, proceed to #2.
If the grinder stops operating shortly after starting, refer
to removal and replacement instructions and inspect
for foreign materials.
2. Disconnect the grinder from the power source and
place a coffee bag behind the dispense chute.
3. Remove the black wire from the rectifier (+) terminal and the red wire from the (-) terminal.
4. Check the voltage across the (+) and (-) terminals
with a voltmeter. Connect the grinder to the power
source. When the Off/On/Start switch is momentarily placed in the “START” (lower) position and
then left in the “ON” (center) position and a bag
is in place behind the coffee dispense chute. The
indication must be approximately 108 volts dc.
5. Disconnect the grinder from the power source.
If voltage is present as described replace the motor.
If voltage is not present as described, reconnect the
white or red and white/blue wires to the motor, refer
to the Wiring Diagrams and check the grinder wiring
harness.
Removal and Replacement - Motor (Refer to Fig. 8)
1. Disconnect all wires from the motor.
2. Remove the two .250”-20 screws (1) securing
grind selector dial plate and grind selector knob
(2) to the grind chamber. Remove dial plate and
selector knob as an assembly.
3. Slide burr (7), auger rotor/spring assembly (3) and
burr rotor disc (4) off the grinder motor shaft as
an assembly.
4. Remove the two .250”-20 screws (8) securing the
stationary burr (9) to the grind chamber.
5. Remove bushing (10) and washer (11) from the
grinder motor shaft.
6. Remove the two #8 thread forming screws (12)
securing the fill plate (13) to grinder housing and
remove plate (13).
7. Remove the four #10-24 screws (14) securing the
chute assembly (15) to the grind chamber and
remove chute assembly (15).
8. Disconnect all the wires from the rectifier (23).
9. Remove the four .312”-18 screws (20), rubber
washers (22) and flat washers (21) securing
the motor and bracket to the grinder housing
bracket.
19
41545 122209
SERVICE (Cont.)
DC MOTOR AND GRIND CHAMBER - G1MD ONLY
(cont.)
10. Remove motor and bracket out the rear of the
grinder housing.
11. Remove the two .250”-20 screws securing the
motor to the front of the mounting bracket.
12. Remove the two #10-32 screws securing the motor to rear of the mounting bracket.
13 Remove motor from bracket.
14. Clean all grinding burrs and mounting surfaces
before reassembly.
15 Place the new motor with hopper collar into posi-
tion on the motor mounting bracket.
16. Using two .250”-20 screws secure the motor to
the front of the mounting bracket.
17. Using two #10-32 screws secure the motor to the
rear of the mounting bracket
18. Install motor and bracket through the rear of the
grinder, position on the grinder housing bracket
and secure with four .312”-18 screws (20), rubber
washers (22) and flat washers (21).
19. Install stationary burr (9) to the grind chamber
housing using two .250”-20 screws (8).
20. Install burr (7), burr auger rotor/spring assembly
(3) and burr rotor disc (4) on to motor shaft.
21. Install grind selector dial plate and grind selector
knob assembly (2) on the grind chamber housing
and secure with two .250”-20 screws.
22. Refer to Fig. 7 and reconnect the wires to the
motor and Fig. 37 and reconnect the wires to the
rectifier.
23. Refer to ADJUSTMENTS section and reset the
burrs.
Removal and Replacement - Grind Chamber - Refer
to Fig. 8:
1. Loosen the two set screws (16) securing the grind
selector knob to the grind selector dial plate (18)
and remove knob.
2. Remove the adjusting screw w/bearing (19). Inspect adjusting screw w/bearing for wear. Replace
if excessively worn or damaged.
BLU to BLU from Rectifier
BLU to WHI/BLU from
Relay (3)
RED to Rectifier (-)
BLK to Rectifier (+)
P1710
FIG. 7 DC MOTOR TERMINALS
3. Remove the two .250”-20 screws (1) securing the
grind selector dial plate (18) to the grind housing
and remove plate.
4. Slide burr auger rotor/spring assembly (3) off of
the grinder motor shaft with burr (7) as an assembly.
5. Remove the two .250”-20 screws (5) securing
burr (7) to burr auger rotor/spring assembly (6),
remove burr (7) and burr rotor disc (4). Inspect
burr (7) for wear. Replace if excessively worn or
damaged.
6. Remove the two .250”-20 screws (8) securing the
stationary burr (9) to grind chamber housing and
remove burr. Inspect for wear. Replace if excessively worn or damaged.
NOTE: Burrs are serviced in sets of two with hard-
ware.
7. Remove bushing (10) and washer (11) from
grinder motor shaft. Inspect for wear. Replace if
excessively worn or damaged.
8. Clean all grinding burrs and mounting surfaces
before reassembly.
9. Install washer (11) and bushing (10) onto the
grinder motor shaft.
10. Install stationary burr (9) inside the grind chamber
and secure with two .250” -20 screws (8).
20
41545 122209
SERVICE (Cont.)
DC MOTOR AND GRIND CHAMBER - G1MD ONLY
(cont.)
11. Install burr (7) on burr auger rotor/spring assembly (6) securing with two .250”-20 screws (5).
12. Slide burr auger rotor/spring assembly and burr
(3) onto the motor shaft.
13. Install burr rotor disc (4).
5 7 6
23
9 8 11 10 3
14. Install the adjusting screw w/bearing (19) into the
grind selector dial plate (18).
15. Install grind selector dial plate (18) with adjusting screw w/bearing (19) onto the grind chamber
housing and secure with two .250”-20 screws
(1).
16. Install grind selector knob (17) onto the grind
selector dial plate (18).
NOTE: Refer to ADJUSTMENTS and reset the burrs.
18 1 19 17
22
21
20
14
15
4 2 1
16
7
13
12
P1711
FIG. 8 MOTOR AND GRIND CHAMBER REMOVAL
21
41545 122209
SERVICE (Cont.)
MOTOR (Models LPG & FPG)
P1022
FIG. 9 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, 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.
If 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. On 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.
2
3
1
FIG. 10 MOTOR REMOVAL
3. Refer to Fig 10. Remove the three #10-32 x .25”
screws (1) securing the motor to the motor support
bracket.
4. Remove the motor, solenoid and solenoid components (2) from the hopper housing (3) as an
assembly.
NOTE: Steps 5 thru 12 apply only to Model LPG-2E.
5. Refer to Fig.11. Remove the three #8-32 Keps
nuts.
6. Lift the retaining ring w/hopper gasket (1) over the
motor and burr housing assembly (6). Set aside for
reassembly.
7. Lift slide plate, solenoid plunger and spring (2) off
of the dowel pin in the mounting ring and slide
solenoid plunger and spring (2) out of solenoid
coil. Set aside for reassembly. Repeat for opposite
side.
22
41545 122209
P1049
SERVICE (Cont.)
MOTOR (Models LPG & FPG)
8. Remove spacer plate (3) and set aside for reassembly.
9. Lift solenoid bracket and solenoids (4) over the
motor and burr housing assembly (6) and set aside
for reassembly.
10. Remove the #8-32 setscrew (5) and set aside for
reassembly.
11. Lay motor on it’s side.
NOTE: Refer to Fig. 14 for the disassembly and assembly
of the burrs and rotor.
12. Remove the two #10-32 fillister head screw securing
burr housing cap (10) to the burr housing.
13. Remove cap, burr adjusting screw, decaffing plate
and decaffer support (10) as an assembly. Set aside
for reassembly.
14. Remove load disc (11) and set aside for reassembly.
15. Slide rotor (12), lower burr (13) and spring (14)
as an assembly off the motor shaft, set aside for
reassembly.
16. Remove burr housing divider (8) and set aside for
reassembly.
1
2
3
2
6
4
5
NOTE: Inspect rotor. If rotor needs to be replaced,
remove the two #10-32 binding head screws securing
lower burr (13) to the rotor and remove burr. Install
lower burr (13) on new rotor (12) using two #10-32
binding head screws.
17. Slide spring retaining bushing (15) off the motor
shaft and set aside for reassembly.
18. Remove the two #10-32 binding head screws securing the upper burr (16) to the motor and housing
assembly (17).
19. Remove the upper burr (16) and set aside for reassembly.
NOTE: If burrs need to be replaced, they must be replaced in matched pairs.
P1050
FIG. 11 SOLENOID AND GATES
1. Retaining Ring W/Hopper Gasket
2. Slide Plate, Solenoid Plunger and Spring
3. Spacer Plate
4. Mounting Ring, Solenoid and Solenoid Mounting
Plate
5. Setscrew, #8-32
6. Motor and Burr Housing
23
41545 122209
SERVICE (Cont.)
MOTOR (Models LPG & FPG)
13
MODEL LPG ONLY
10 11 12 13 14 15 16 17 18
FIG. 12 ROTOR/AUGER, BURRS AND MOTOR COVER
20. 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
reassembly.
21. Discard old motor and housing assembly.
22. Place new motor on it’s side and install motor cover
(18) using two #8-32 flat head screws.
23. Install upper burr (16) to the new motor and housing assembly (17) using two #10-32 binding head
screws.
24. Install spring retaining bushing (15) on motor
shaft.
25. Refer to Fig. 11. Install burr housing divider (8) in
slot in the burr housing and secure with #8-32 cup
point setscrew (7), for Model LPG-2E only.
26. Refer to Fig. 12. Install rotor (12), lower burr (13) and
spring (14) as an assembly on the motor shaft.
27. Install load disc (11) flat side towards rotor.
28. Install burr housing cap (10), adjusting screw,
dechaffing spring plate and dechaffer support as an
assembly to the new motor and housing assembly
(17) using two #10-32 fillister head screws.
29. Set motor upright with burr housing at the bottom.
P1051
NOTE: Steps 30 thru 33 apply only to Model LPG-2E.
30. Install solenoids and solenoid bracket (4) as an
assembly on the new motor.
31. Install spacer plate (3) making sure the hole in the
spacer plate aligns with the hole in the mounting
ring.
32. Install solenoid plunger with spring and slide plate
(2) as an assembly into the solenoid coil. Place slide
plate on the dowel in the mounting ring. Repeat for
the opposite side.
33. Install retaining ring w/hopper gasket (1) using
three #8-32 pan head screws and three #8-32 keps
nuts.
34. Refer to Fig.10. Install motor, solenoids and solenoid
components (2) in the hopper housing (3) using
three #10-32 truss head screws (1).
35. Reconnect wires for motor and solenoids. Refer to
wiring schematic.
24
41545 122209
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