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BUNN
OPERATING & SERVICE MANUAL
BUNN-O-MATIC CORPORATION
PHONE: (217) 529-6601 FAX: (217) 529-6644
10191.0000Q 1/00 ©1995 Bunn-O-Matic Corporation
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Summary of Contents for Bunn G1

  • Page 1 5 . F 6 . R N IN N IN OPERATING & SERVICE MANUAL BUNN-O-MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD, ILLINOIS 62708-3227 PHONE: (217) 529-6601 FAX: (217) 529-6644 10191.0000Q 1/00 ©1995 Bunn-O-Matic Corporation...
  • Page 2 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 to an authorized Bunn service location.
  • Page 3 READ THE ENTIRE OPERATING MANUAL INCLUDING THE LIMIT OF WARRANTY AND 11076.0000 LIABILITY BEFORE BUYING OR USING THIS PRODUCT 20545-0000 7/90 © 1990 Bunn-O-Matic Corporation 20545.0000 1. Select the desired grind. 1. Select the desired grind. 2. Lift the lid and pour coffee beans into the hopper.
  • Page 4 Do not attempt to bypass this safety device. CLEANING The use of a damp cloth rinsed in any mild, non-abrasive, liquid detergent is recommended for cleaning all surfaces on Bunn-O-Matic equipment. Regular cleaning will keep your grinder looking new for years...
  • Page 5 COFFEE GRINDING Turn the selector knob to align the red arrow with the desired grind. Raise the top lid and add the whole bean coffee. Close the top lid. Locate the back of a bag behind the dispense chute. (The grinder will not operate unless the bag is behind the chute.) Allow the bag to rest on the screen beneath the chute.
  • Page 6 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 person- nel.
  • Page 7 TROUBLESHOOTING (cont.) PROBABLE CAUSE REMEDY PROBLEM 3. Bag Sensor. (cont.) (B) Refer to Service - Bag Sensor Grinder will not start. (cont.) Switch for testing and adjustment procedures. See page 9. 4. Motor overload protector. Remove the plug located on the right side of the housing.
  • Page 8 TROUBLESHOOTING (cont.) PROBLEM REMEDY PROBABLE CAUSE Grinder starts, but will not dis- Coffee must be poured into hopper 1. Hopper pense. before grinding. Foreign materials must not block the 2. Entrance to grind chamber opening at the bottom of the hop- per.
  • Page 9 SERVICE BAG SENSOR SWITCH 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. COMPONENT ACCESS e r. tr a th e th e in to...
  • Page 10 SERVICE (cont,) AC MOTOR AND GRIND CHAMBER BAG SENSOR SWITCH (cont.) If voltage is present as described, proceed to If voltage is not present as described, refer to the Wiring Diagrams and check the grinder wir- ing harness. e r. th e tr a th e...
  • Page 11 SERVICE (cont,) 11. Clean all grinding burrs and mounting surfaces before reassembly. AC MOTOR AND GRIND CHAMBER (cont.) 12. Install the four .250"-20 cage nuts on the new black and white/blue wires on terminals L1 & motor. L2 with a voltmeter. Connect the grinder to the 13.
  • Page 12 SERVICE (cont.) AC MOTOR AND GRIND CHAMBER (cont.) 18 1 19 17 20 7 6 4 e r. tr a th e th e in to s lo n d . b e a in g ll y . g ri e n s s t th ti c a...
  • Page 13 SERVICE (cont.) If the grinder stops operating shortly after starting, refer to removal and replacement instructions and AC MOTOR AND GRIND CHAMBER (cont.) inspect for foreign materials. 17. Install grind selector dial plate (18) with adjust- Disconnect the grinder from the power source ing screw w/bearing (19) onto the grind cham- and place a coffee bag behind the dispense chute.
  • Page 14 SERVICE (cont,) BLU to BLU from Rectifier DC MOTOR AND GRIND CHAMBER - G1MD ONLY BLU to WHI/BLU from (cont.) Relay (3) RED to Rectifier (-) 10. Remove motor and bracket out the rear of the BLK to Rectifier (+) grinder housing.
  • Page 15 SERVICE (cont,) 14. Install the adjusting screw w/bearing (19) into the grind selector dial plate (18). DC MOTOR AND GRIND CHAMBER - G1MD ONLY 15. Install grind selector dial plate (18) with adjust- (cont.) ing screw w/bearing (19) onto the grind cham- ber housing and secure with two .250"-20 screws 11.
  • Page 16 SERVICE (cont,) If continuity is present as described, proceed to #6. If continuity is not present as described, replace the OFF/ON/ START SWITCH switch. Check for continuity across the two 3/16" termi- nals when the switch is held in the “START” (lower) position.
  • Page 17 SERVICE (cont.) Removal and Replacement: Disconnect the wires from the rectifier. RECTIFIER - G1MD ONLY Remove the #10-32 screw securing the rectifier to the motor mounting bracket. Remove the rectifier and discard. Install new rectifier on the rear of the motor mounting bracket and secure with a #10-32 screw.
  • Page 18 SERVICE (cont,) “ON” (center) position or “START” (lower) posi- tion. Connect the grinder to the power source. RELAY The indication must be: a. 120 volts ac for two wire 120 volt models. b. 230 volts ac for two wire 230 volt 50 Hz mod- e r.
  • Page 19 SERVICE (cont,) WHI to Main WHI/VIO from Harness 120V (B) RELAY (cont.) Switch to Relay RED/BLK to Main Removal and Replacement (120 Volt and 240V 60 Hz Harness 240V (B) Models): Remove the wires from the relay terminals. WHI/BLU from Remove the two #6-32 screws securing the re- Motor to Relay lay bracket w/relay to the grinder base and re-...
  • Page 20 SCHEMATIC WIRING DIAGRAM G1, G2 & G3 WHI/RED WHI/BLU 120 VOLT AC WHI/VIO 2 WIRE SINGLE PHASE 60 HZ WHI/ORA WHI/VIO 10190.0000F 9/91 © 1985 BUNN-O-MATIC CORPORATION SCHEMATIC WIRING DIAGRAM G1-MD WHI/RED RECT WHI/VIO WHI/VIO WHI/ORA 120 VOLTS AC 2 WIRE SINGLE PHASE 60 HZ 10621.0000C 10/98 ©...
  • Page 21 SCHEMATIC WIRING DIAGRAM G1A, G2A & G3A GRN/YEL RED (230V) N.O. WHI/RED WHI/BLU RED/BLK (240V) N.O. WHI/VIO WHI/RED RED (230V) RED/BLK (240V) WHI/VIO WHI/ORA 230 VOLTS AC 240 VOLTS AC 2 WIRE SINGLE PHASE 10754.0000D 12/99 © 1993 BUNN-O-MATIC CORPORATION (Revised January 2000)

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