Bunn G1 Manuales De Servicio

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 con-

nect the grinder to the power source. The indica-

tion must be:

a. 120 volts ac for two wire 120 volt models.

b. 230 volts ac for two wire 230 volt models.

c. 240 volts ac for two wire 240 volt models

3. Disconnect the grinder from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wir-

ing Diagrams and check the grinder wiring harness.

4. Remove the white/red wires from relay contacts

7 & 9.

5. Check the voltage across the white wire or red/

black on terminal B and either white/red wire with

a voltmeter. Place the Off/On/Start in either the

SERVICE (cont,)

“ON” (center) position or “START” (lower) posi-

tion. 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 mod-

els.

c. 240 volts ac for two wire 240 volt 60 Hz mod-

els.

6. Disconnect the grinder from the power source.

7. Check the voltage across terminal B and the

remaining white/red wire with a voltmeter. Place

the Off/On/Start switch in either the “ON” (center)

position or “START (lower) position. 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 mod-

els.

c. 240 volts ac for two wire 240 volt 60 Hz mod-

els.

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 Wir-

ing 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. Continu-

itymust 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. Con-

nect 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.

RELAY

FIG.14 RELAY

P1704

10191 011500