Assessments - 3, GPA: 4.3 ( )

Fabricante : Bunn Arquivo Tamanho: 5.55 mb Arquivo Nome : Língua de Ensino:

- 118.5 k. Across either pair Location: The EMI Filter is located inside the rear cover of the grinder housing. Test Procedure: 1. Disconnect the dispenser from the power source. 2. Disconnect the two red wires and two white wires on the EMI Filter from the EMI Filter wiring harness. 3. Check for resistance between the two red leads on the EMI Filter. (Fig 61) If resistance is present as described the EMI Filter is operating properly. If resistance is not present as described, replace the EMI Filter. Removal and Replacement: 1. Disconnect the wires from the EMI Filter. 2. Remove the two screws securing the EMI Filter. 3. Remove and discard EMI Filter. 4. Install new EMI Filter using two screws to secure EMI Filter to its former location. 5. Refer to schematic when reconnecting the wires. FIG 61 EMI FILTER TERMINALS 41545 122209 SERVICE (Cont.) Funnel Sensing Coil (Models MHG & G9-2 DBC) FIG 62 FUNNEL SENSING COIL Location: The funnel sensing coil is located inside of the coil cover. Test Procedure: 1. Disconnect the grinder from the power supply. 2. Remove the two 6-32 screws attaching the coil cover to the front of the grinder housing. 3. Pull slightly away from the housing and disconnect the two wires from the coil. 4. With an ohmmeter, measure the resistance across the pin terminals of the coil. The reading should be 5 to 7 ohms. If this amount of resistance is not present, replace the funnel sensing coil. Removal and Replacement 1. Disconnect the grinder from the power supply. 2. Remove the two 6-32 screws attaching the coil cover to the grinder housing. 3. Pull slightly away from the housing and disconnect the two wires from the coil. 3. Remove the coil from the coil cover. 4. Place the new coil into the coil cover and attach the two wires previously removed. 5. Secure cover with two 6-32 screws. FIG 63 FUNNEL SENSING COIL TERMINALS 41545 122209 SERVICE (Cont.) Memory Clock Board (Model MHG) FIG 64 MEMORY CLOCK BOARD Location: The memory clock board is located on the component mounting bracket mounted to the grinder base inside the front access panel. Test Procedure: 1. Disconnect the grinder from the power supply. 2. Disconnect the wiring harness on the memory board. 3. Check for 5VDC on J1-4 and J1-5. If voltage is not present as described the memory board is operating properly. If voltage is present as described, replace the memory board. Removal and Replacement 1. Disconnect the grinder from the power supply. 2. Remove the front access panel. 3. Remove the two 8-32 screws securing the component bracket to the grinder base and tilt forward to gain access to the memory clock board. 5. Disconnect the harness from the memory clock board. 6. Remove the two 6-32 nuts attaching the memory clock board to the component bracket. 7. Remove the two spacers from the old board and attach to the new board. 8. Install new memory board using two #6-32 nuts to secure board to the component bracket. 9. Refer to Fig. 65 when reconnecting the wires. MEMORYBOARDGRNWHIREDBLK J1-1 J16-1 +5VDC J16-5 J1-5 FIG. 65 MEMORY CLOCK BOARD CONNECTORS 41545 122209 SERVICE (Cont.) Display Board (Model MHG) To Control Board J8 J9-10J9-15J9-5J9-1DISPLAY BOARD161J10-4J10-1ORNYELGRNBLUJ9-116 FIG 66 DISPLAY BOARD Location: The display board is located inside the hopper housing behind the membrane switch. Test Procedure: 1. Press and hold the upper right hidden button to enter the Programming menus. 2. Scroll to SERVICE TOOLS menu, and press the button under "YES". 3. Press "YES" under TEST OUTPUTS and proceed, through the menus to test the left and right gates, and the grinder motor. 4. Then scroll to the TEST SWICHES menu and press the button under "YES". Test each button on the conttrol panel, the button pressed will be displayed on the screen. Removal and Replacement 1. Disconnect the grinder from the power supply. 2. Remove the two 6-32 screws attaching the membrane switch bezel to the hopper housing. 3. Tilt the bezel assembly forward. 4. Remove the four 8-32 screws attaching the board cover bracket to the switch bezel and remove the bracket. 5. Disconnect the wiring harness from the display board. 6. Remove the four 8-32 screws attaching the display board to the switch bezel and remove the board. FIG 67 DISPLAY BOARD TERMINALS 41545 122209 TRIAC MAP for MHG MOV1 controls Transformer @ J5-4,5,6 TH1 & MOV2 controls Left Gate @ J5-3 TH2 & MOV3 controls Relay @ J5-2 TH3 & MOV4 controls Right Gate @ J5-1 41545 122209 TRIAC MAP for FPG-2 DBC and G9-2 DBC TH1 & MOV1 controls Left Gate @ J1-1 TH2 & MOV2 controls Relay @ J1-2 TH3 & MOV3 controls Right Gate @ J1-3 MOV4 controls Transformer @ J1-4,5,6 41545 122209 WIRING DIAGRAMS SCHEMATIC WIRING DIAGRAM G9-2 DBC, G9-2T DBC W/SMART FUNNEL™ N WHI BLK L1 LEFT GATE LIMIT THERMOSTAT LIMIT THERMOSTAT SOL SOL WHI/ORA WHI/GRN WHI/YEL BLK WHI RED/BLK J1-6 J1-6 J8-3 J8-1 J6-10 J6-5 J6-1 CONTROL PC BOARD COIL RELAY RIGHT GATE 1 11 SHIELD FUNNEL SENSOR WHI/GRN WHI/VIO SWITCH UNIT ASSY B2 C4 C5 C6 A2 A1 C...

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