Assessments - 3, GPA: 4
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Connect the grinder to the power source. 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 models. c. 240 volts ac for two wire 240 volt 60 Hz models. 8. Disconnect the grinder from the power source. If voltage is present as described, proceed to #9. If voltage is not present as described, refer to the Wiring Diagrams and check the grinder wiring harness. 9. Remove the white/violet wire from terminal 6 and white/blue wire from terminal 4. 10. Check for continuity across terminals 7 & 4. Connect the grinder to the power source. Continuitymust be present when the Off/On/Start switch is momentarily placed in the “START” (lower) position and a bag is in place behind the coffee dispense chute. 11. Check for continuity across terminals 9 & 6. Connect the grinder to the power source. Continuity must be present when the Off/On/Start switch is momentarily placed in the “START” (lower) position and a bag is in place behind the coffee dispense chute. 12. Disconnect the grinder from the power source. If continuity is present as described, reconnect the wires, the relay is operating properly. If continuity is not present as described, replace the relay. 41545 072710 SERVICE (Cont.) RELAY (cont.) Removal and Replacement (120 Volt and 240V 60 Hz Models): 1. Remove the wires from the relay terminals. 2. Remove the two #6-32 screws securing the relay bracket w/relay to the grinder base and remove bracket and relay as an assembly. 3. Remove the #6-32 screw securing the relay to the bracket and remove relay and discard. 4. Install new relay to the mounting bracket using one #6-32 screw, 5. Mount the new relay w/bracket to the grinder base using two #6-32 screws. 6. Refer Fig. 41 when reconnecting the wires. Removal and Replacement (230 volt 50 Hz Models): 1. Remove the wires from the relay terminals. 2. Remove the two #6-32 screws securing the relay to the grinder base. 3. Remove relay and discard. 4. Install new relay to the grinder base using two #6-32 screw. 5. Refer Fig. 41 when reconnecting the wires. WHI to Main Harness 120V (B) RED/BLK to Main Harness 240V (B) WHI/VIO from Switch to Relay K-6 WHI to Main Harness 120V(0) RED/BLK to Main Harness 240V(0) WHI/ORN from Bag Sensor Switch(1) WHI/BLU from Motor to Relay K-4 WHI/RED from Switch to Relay K-2 & K-8 WHI/VIO from Switch to Relay K-6 WHI/ORN from Bag Sensor Switch (A) WHI/RED from Switch to Relay K-7 & K-9 WHI/BLU from Motor to Relay K-4 120V AND 240 VOLT AC MODELS 120V AND 240 VOLT AC MODELS WHI to Main Harness 120V (B) RED/BLK to Main Harness 240V (B) WHI/VIO from Switch to Relay K-6 WHI/ORN from Bag Sensor Switch(1) WHI to Main Harness (0) WHI/BLU from Motor to Relay K-4 WHI/RED from Switch to Relay K-2 & K-8 WHI/VIO from Switch to Relay K-6 WHI/ORN from Bag Sensor Switch (A) WHI/BLU from Motor to Relay K-4 WHI/RED from Switch to Relay K-7 & K-9 120 VOLT DC MODELS 120 VOLT DC MODELS WHI/VIO from Switch to Relay K-6 RED from Main Harness (B) WHI/ORN from Bag Sensor Switch(1) RED from Main Harness (0) WHI/BLU from Motor to Relay K-4 WHI/RED from Switch to Relay K-2 & K-8 WHI/VIO from Switch to Relay K-6 WHI/RED from Switch to Relay K-7 & K-9 WHI/BLU from Motor to Relay K-4 WHI/ORN from Bag Sensor Switch (A) 230 VOLT AC 50 Hz MODELS 230 VOLT AC 50 Hz MODELS P1707 P3696 LATE MODELS EARLY MODELS FIG. 41 RELAY TERMINALS 41545 122209 SERVICE (Cont.) Relay (Models MHG, FPG-2 DBC, Late Model G-9, G9-2, G9-2 DBC) FIG 42 RELAY Location: The relay is located either on the timer bracket or on the component mounting 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. Access the relay and remove the wires from all terminals. 3. With an ohmmeter, check for continuity between the 0 and 1 terminals. 4. With an ohmmeter, check that there is an open circuit between terminals 2 and 4, and between terminals 6 and 8. If continuity is present as described, reconnect the wires, the relay is operating properly. If continuity is not present as described, replace the relay. Removal and Replacement 1. Disconnect the grinder from the power supply. 2. Remove all wires from the relay terminals. 3. Remove the two 8-32 screws attaching the relay to the mounting bracket. 4. Refer to Fig 43 when connecting relay wires. FIG 43 RELAY TERMINALS 41545 122209 SERVICE (Cont.) Hopper Slide Plates (Models G9-2, G9-2 DBC) M. A. B. C. D. E. F. G. H. A. Solenoid Coil B. Fiber Washer C. Spring D. Spring Retaining Washer E. Solenoid Plunger F. Snap Ring G. Short Link H. Long Link I. Slide Plate J. Pivot Pin K. Stop Block L. Solenoid Mounting Plate M. Solenoid Limit Thermostat I. J. K. L. P608 FIG 44 HOPPER SLIDE PLATES Location: The slide plates are located on the solenoid mounting plate immediately beneath the hopper openings. The slide plates must always remain flat for proper operation. Test Procedure: With the solenoi...
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