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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 o
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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 po
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CONTENTS Warranty and Trademark .................................................................................................3 Introduction ....................................................................................................................4 Recommended Daily Cleaning ........................................................................................4 G9WD Packaging & Shim Removal ................................................................................5 Operating
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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 Departme
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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)
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OPERATING CONTROLS c d Model G9WD Grind Pad (a) Pressing initiates a grind cycle. Stop Pad (b) 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 w
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OPERATING CONTROLS (Continued) Model G9 Off/On/Start Switch OFF - (left position) Placing the switch in this position stops the operation of the grinder. URN ON ON - (center, resting position) S O T F A F R T The switch will return to this position after a grind cycle has begun and will remain in this CARAFE 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 - S
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OPERATING CONTROLS (Continued) c Model MHG Grind Pad (a) d d Pressing initiates a timed grind cycle. Stop Pad (b) Pressing ends the operation of the grinder. a b ® 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. PANTONE PANTONE PANTONE PANTONE PANTONE Red 032 CV 430 CVC 4
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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 P2947 and releasing initiates a grind cycle. Batch Selector Switch Select Small, Medium or Large batch by turning the ro
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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 per formed only by qualified ser vice personnel. • All electronic components have ac voltage and dc voltage potential on their terminals.
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TROUBLESHOOTING (cont.) Problem Probable Cause Remedy Grinder will not start. (Continued) 5. Motor Each motor is equipped with a temperature and current overload protection feature which will im- mediately shut off the motor when an overload has occurred. Check the grinder for obstructions. Refer to Service - Motor for testing pro- cedures. 6. Relay Refer to Service - Relay for testing procedures. 7. Bag sensor or Cup Sensor (A) The receiving bag must be placed on the tray screen and have
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Problem Probable Cause Remedy Grinder starts, but will not dispense 1. Hopper(s) Begin each grind cycle by visually from hopper. inspecting the hopper(s) for ample supplies of whole bean coffee. 2. Blockage of hopper(s) Foreign materials must not block the openings at the bottom of the hopper(s). 3. Slide Gate Solenoids (Model LPG- Refer to Service - Solenoids for test- 2E only) ing procedures. 4. Timer Refer to Service - Timer for testing procedures. 5. Off/On/Start switch Refer to Service
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TROUBLESHOOTING (cont.) PROBABLE CAUSE PROBLEM REMEDY Incorrect coffee grind dispensed. 1. Burr adjustment Refer to the Adjustment section in the Installation and Operation Manual. Excessive chaff 1. Dechaffer Replace the dechaffer springs. Replacement dechaffer springs are provided in the literature package accompnting the grinder. Grinder only dispenses from one 1. Hopper selector switch (Model Refer to Service - Hopper selector hopper LPG-2E only) switch for testing procedures. Timer wi
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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 P1306 when servicing, except when electrical tests are re- quired and the test procedure specifically state
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SERVICE (Cont.) BAG SENSOR SWITCH (Models G1, G2, G3) or CUP SENSOR SWITCH (MODEL G2 TRIFECTA) 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 pres
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SERVICE (Cont.) 4. Check the voltage across the white, red or red/ AC MOTOR AND GRIND CHAMBER 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 momen- tarily 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 vo
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SERVICE (Cont.) AC MOTOR AND GRIND CHAMBER (cont.) 19. Install burr rotor cup (5). 11. Clean all grinding burrs and mounting surfaces 20. Install grind selector dial plate and grind selector before reassembly. knob assembly on the grind chamber housing and 12. Install the four .250”-20 cage nuts on the new secure with two .250”-20 screws. motor. 21. Refer to Fig. 4 and reconnect the wires. 13. Place the new motor with hopper collar and bush- 22. Refer to ADJUSTMENTS in the Installation and
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SERVICE (Cont.) AC MOTOR AND GRIND CHAMBER (cont.) 18 1 19 17 20 7 6 4 5 11 10 9 8 3 2 1 16 14 13 15 7 12 P1708 FIG. 5 GRIND CHAMBER COMPONENTS 9. Remove bushing (10) and shaft extension (11) from Removal and Replacement - Grind Chamber - Fig. 5: grinder motor shaft. Inspect for wear. Replace if exces- 1. Loosen the two set screws (16) securing the grind sively worn or damaged. selector knob to the grind selector dial plate (18) and 10. Install shaft exten
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SERVICE (Cont.) DC MOTOR AND GRIND CHAMBER - G1MD ONLY 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 momen- tarily 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 repl
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SERVICE (Cont.) DC MOTOR AND GRIND CHAMBER - G1MD ONLY BLU to BLU from Rectifier (cont.) BLU to WHI/BLU from Relay (3) 10. Remove motor and bracket out the rear of the RED to Rectifier (-) grinder housing. BLK to Rectifier (+) 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 mo- tor to rear of the mounting bracket. 13 Remove motor from bracket. P1710 14. Clean all grinding burrs and mounting surfaces
