Operating & service manual bunn-o-matic corporation post office box 3227 springfield, illinois 62708-3227 phone: (217) 529-6601 fax: (217) 529-6644 10171.0000 5/00 © 1986 bunn-o-matic corporation bunn ® g9 hd g9t hd pe rs on al in ju ry ha za rd . Ke ep fin ge rs a nd fo re ig n o bj ec ts ou t o f ...
2 contents introduction --------------------------------------------------- 2 warranty ------------------------------------------------------- 2 user notices --------------------------------------------------- 3 electrical requirements -------------------------------------- 3 initial set up --------...
3 user notices carefully read and follow all notices on the grinder and in this manual. They were written for your protection. All notices on the grinder are to be kept in good condition. Replace any unreadable or damaged labels. #05876.0000 #20545.0000 electrical requirements this grinder has an at...
4 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. Care should be taken not to scratch the windows with any abrasive mate- rial. Regular cleaning will keep your grinder looking new for years. Coffe...
5 adjustments (cont.) burr adjustment (cont.) 8. The following settings approximately correspond to the cbc recognized grinds. All are referenced from the arrow position noted in step 7. Fine grind: rotate the adjusting screw 7 hash marks in a counterclockwise direction. Drip grind: rotate the adjus...
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 tech- nical service department. • inspection, testing, and repair of ele...
7 troubleshooting (cont.) problem grinder will not start. (cont.) grinder will not shut off. Grinder starts, but will not dis- pense. Incorrect amount of coffee. Incorrect coffee grind dispensed. Probable cause 4. Timer 5. Relay 6. Motor 1. Off/on/start switch 2. Timer 3. Relay 1. Hopper 2. Bottom o...
8 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 sho...
9 motor location: the motor is located in the upper wrapper under the hopper. Test procedure: 1. Remove the hole plug located on the right side of the housing. Press the red “reset” button vis- ible through the opening. Listen carefully for a “click”. This resets the motor protection circuit and may...
10 removal and replacement - grind chamber 1. Refer to the illustration above and remove the two 1/4"-20, hex head screws holding the burr housing cap(3) to the burr housing; carefully re- move the burr housing cap. Inspect the adjust- ing screw(2) to see if the thrust plug is worn. Replace if exces...
11 service (cont.) off/on/start switch location: the off/on/start switch is centered in the hous- ing above the upper front inspection panel. Test procedure: 1. Disconnect the grinder from the power supply. 2. Remove the black wire from the switch. 3. Check for continuity across the black wire from ...
12 relay location: the relay is located on the timer bracket in the grinder base. The bracket can be removed by loosen- ing the two 8-32 screws beneath the timer dial. Test procedure: 1. Disconnect the grinder from the power supply. 2. Check the voltage across the white/red and white/ green wires of...
13 service (cont.) timer location: the timer is located on the timer bracket in the grinder base. The bracket can be removed by loosen- ing the two 8-32 screws beneath the timer dial(s). Test procedure: 1. Disconnect the grinder from the power supply. 2. Check the voltage across terminals tl1 & tl2 ...
14 10173-0000f 4/91 © 1987 bunn-o-matic corporation whi/grn blk k1 whi/blu m l2 l1 120 volts ac 2 wire single phase 60 hz l1 n green k1 n.O. Schematic wiring diagram g9 timer whi/red whi/yel whi/ora whi whi whi/red whi/red optional key sw 5 4 3 2 1 w h i / o r a ora urn carafe whi/grn 1 blk k1 whi/b...
15 10187-0000b 11/97 © 1987 bunn-o-matic corporation whi/grn blk k1 whi/blu m l2 l1 200 volts ac 2 wire single phase 50 hz l1 l2 green k1 n.O. Schematic wiring diagram g9a hd timer whi/red whi/yel whi/ora red/blk red/blk whi/red whi/red 5 4 3 2 1 10187.0001b 11/97 © 1997 bunn-o-matic corporation whi...
16 wiring diagram 4 3 whi/grn 1 blk whi/blu l2 l1 120 volts ac 2 wire single phase 60 hz 10388-0000b 12/88 © 1988 bunn-o-matic corporation l1 n green k1 n.O. Schematic wiring diagram g9 timer 3 2 4 5 whi/red whi/yel whi/ora whi whi whi/red whi/red gry 1 2 optional multi-set sw optional brewer interf...
