Assessments - 3, GPA: 4.7
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8. Repeat steps 4 thru 7 for the other hopper. APPROXIMATE TIMER SETTINGS IN SECONDS Weight Fine Drip Regular (ounces) (7*) (8*) (12*) 1.5 0.5 0.5 0.5 1.75 0.7 0.6 0.6 2.0 1.0 0.8 0.8 2.25 1.4 1.4 1.2 2.5 1.9 1.8 1.6 2.75 2.4 2.2 2.0 3.0 2.9 2.7 2.5 3.25 3.3 3.1 2.9 4.0 4.8 4.4 4.0 6.0 8.6 7.9 7.5 8.0 12.0 11.5 10.9 10.0 15.7 15.1 14.1 12.0 19.6 18.5 17.5 14.0 23.5 22.0 20.9 16.0 27.0 25.3 24.3 *Hash mark settings. Refer to Adjustment-Burrsection. 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 personnel. • All electronic components have 120 volt ac and low voltage dc potential on their terminals. Shorting of terminals or the application of external voltages may result in board failure. • Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent. If an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a terminal or crimp. • Make certain that all electrical connections are tight and isolated. WARNING • Exercise extreme caution when servicing electrical equipment. • Turn power OFF when servicing, except when electrical tests are specified. • Follow recommended service procedures. • Replace all protective shields or safety notices. 7 TROUBLESHOOTING (cont.) Problem Probable Cause Grinder will not start. 1. No power or incorrect voltage 2. Off/On/Start switch 3. Timer 4. Relay 5. Motor overload protector 6. Motor Grinder will not shut off. 1. Off/On/Start switch 2. Timer Remedy (A) Plug-in the grinder. (B) Check the voltage at the wall outlet with a voltmeter. It must be 120 volts ac. (A) Momentarily press the Off/On/ Start switch to the “START” (lower) position. (B) Refer to Service - Off/On/Start switch for testing procedures. See page 11. Refer to Service - Timer for testing procedures. See page 17. Refer to Service - Relay for testing procedures. See page 14. Remove the cover plate located on the right side of the housing. Press the red “Reset” button. 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 Motor for disassembly procedures. See page 12. Refer to Service - Motor for testing procedures. See page 12. (A) Place the switch in the “OFF/ STOP” position. (B) Refer to Service - Off/On/Start Switch for testing procedures. See page 11. Refer to Service - Timer for testing procedures. See page 17. 8 10 The rear panel is attached with eight 8-32 slotted head screws. The hopper assembly is attached with four 6- 32 slotted head screws with locking nuts located on the sides of the housing near the center and rear. Removal of the hopper will also require disconnection of the solenoid wires from the grinder wiring harness. Contents Off/On/Start Switch ............................................. 11 Motor.................................................................. 12 Relay .................................................................. 14 Slide Plate(s) ...................................................... 15 Snubber .............................................................. 16 Solenoid(s) ......................................................... 16 Timer .................................................................. 17 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 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 upper and lower front inspection panels, hopper assembly, and rear panel. The upper front inspection panel is attached with two 6-32 slotted head screws. The lower front inspection panel is attached with two 6-32 slotted head screws. Use only on a properly protected circuit capable of the rated load. Electrically ground the chassis. Follow national/local electrical codes. Do not use near combustibles. An extension cord, when used, must be shorter than 20 feet if 16-gage 3-conductor wire, or shorter than 10 feet if 18-gage 3-conductor wire. FAILURE TO COMPLY RISKS EQUIPMENT DAMAGE, FIRE, OR SHOCK HAZARD REA...
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