Évaluations - 4, GPA: 4.3 ( )

Fabricant : Bunn Taille : 5.55 mb Nom Fichier : Langue d'enseignement:

The meter should read between 13.5K and 19.5K ohms. Turn the knob all the way clockwise, the meter should read between 108K and 132K ohms. If continuity is present at all positions, the potentiometer switches are operating properly. If continuity is not present at any position, replace the potentiometer switches. 8. Refer to Fig 35 when reconnecting wires. Removal and Replacement: 1. Disconnect the grinder from the power source. 2. Remove the four 8-32 screws attaching the rear access panel and move aside. 3. Disconnect three wires to the batch selector switch and the one wire to the timer. 4. Loosen the setscrews on the switch knobs and remove the knobs. 5. Remove the three nuts and lockwashers attaching the switches to the rear access panel. 6. Inspect and replace the adhesive backed sponge washers on the rear access panel if necessary. 7. Install the new potentiometer switches and tighten the lockwashers and nuts. 8. Replace the knobs and tighten the setscrews. 9.Refer to Fig. 35 when reconnecting wires. BRN to BRN WIRE at TIMER PNK to BATCH SELECTOR SWITCH GRY to BATCH SELECTOR SWITCH TAN to BATCH SELECTOR SWITCH FIG 35 POTENTIOMETER TERMINALS 41545 122209 SERVICE (Cont.) Rectifier (Models G1 MD, FPG-2 DBC) Removal and Replacement: 1. Disconnect the wires from the rectifier. 2. Remove the #10-32 screw securing the rectifier to the motor mounting bracket. 3. Remove the rectifier and discard. 4. Install new rectifier on the rear of the motor mounting bracket and secure with a #10-32 screw. 5. Refer to Fig. 37 and reconnect the wires. BLK from Motor (+) BLU to BLU from Motor (AC) WHI from Main Harness (AC) RED from Motor (-) + ACAC P1706 P1381 FIG. 37 RECTIFIER TERMINALS FIG. 36 RECTIFIER Location: The rectifier is located inside the grinder housing mounted on the rear of the motor mounting bracket for models G1 MD and on the component mounting bracket for model FPG-2 DBC. Test Procedures: 1. Disconnect the grinder from the power source. 2. Remove the red wire and the black wire from the rectifier. 3. Check the voltage across the (+) and (-) terminals on the rectifier with a voltmeter. Connect the grinder to the power source and start the grinder motor. The indication must be approximately 108 volts dc. 4. Disconnect the grinder from the power source. If voltage is present as described, the rectifier is operating properly. If voltage is not present as described, refer to the grinder wiring diagram and check the grinder wiring harness. 41545 122209 SERVICE (Cont.) Relay (Early Model G-9) MINUTESBUNN-O-MATICP/N 2620- 120 VACMINUTESBUNN-O-MATICP/N 2620- 120 VAC Single set timer shown Multi set timer (Urn/Carafe) similar P1312 FIG 38 RELAY Location: The relay is located on the timer bracket in the grinder base. The bracket can be removed by loosening 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 the relay coil with a voltmeter when the Off/On/Start switch is placed in the “START” (right) position and released. Connect grinder to the power supply. The indication must be: (a) 120 volts ac for two wire 120 volt models (b) 240 volts ac for two wire 240 volt models for the approximate setting on the timer. 3. Disconnect the grinder from the power supply. If voltage is present as described, reconnect the white/red and white/green wires to the relay coil, and proceed to step 4. If voltage is not present as described, refer to the Wiring Diagrams and check the grinder wiring harness. 4. Remove the white/red and white/blue wires from the relay contacts. 5. Check for continuity across the relay contacts when the Off/On/Start switch is placed in the “START” (right) position and released. Connect grinder to the power supply. Continuity must be present for the approximate setting on the timer. 6. Disconnect the grinder from the power supply. If continuity is present as described, reconnect the white/red and white/blue wires, the relay is operating properly. If continuity is not present as described, replace the relay. Removal and Replacement 1. Remove all wires from the relay terminals. 2. Remove the 6-32 screw fastening the relay to the timer bracket. 3. Mount the new relay to the timer bracket and tighten the screw. 4. Refer to the illustration below when reconnecting the wires. WHI/BLU to Motor L1 WHI/GRN to Timer L4 WHI/RED to Timer TL1 P610 FIG 39 RELAY TERMINALS 41545 122209 SERVICE (Cont.) Relay (Models G1, G2, G3, G2 trifecta) P1704 FIG.40 RELAY Location: The relay is located on the grinder base inside the lower housing. Test Procedure: 1. Disconnect the grinder from the power source and place a coffee bag behind the dispense chute. 2. Check the voltage across the white/orange and white or red/black wires on terminals A & B of the relay 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. 1...

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