Bunn G9 HD Operating & Service Manual page 12

SERVICE (cont.)
If continuity is not present as described, replace
the switch.
Removal and Replacement:
1. Remove all the wires from the switch termi-
nals.
2. Compress the clips inside the housing and gently
push the switch through the opening.
3. Push the new switch into the opening and spead
the clips to hold the switch in the housing.
4. Refer to the illustration below when reconnecting
the wires.
TAN
PNK
Relay
Single set timer shown
Multi set timer (Urn/Carafe) similar
Location:
The relay is located on the timer bracket in the
grinder base. The bracket can be removed by loosen-
ing 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
3.
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.
YEL
5.
ORA
GRN
6.
P1318
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.
2.
3.
4.
P1312
Page 12
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.
Disconnect the grinder from the power supply.
Remove the white/red and white/blue wires from
the relay contacts.
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.
Disconnect the grinder from the power supply.
Remove all wires from the relay terminals.
Remove the 6-32 screw fastening the relay to the
timer bracket.
Mount the new relay to the timer bracket and
tighten the screw.
Refer to the illustration below when reconnect-
ing the wires.
WHI/RED to Timer TL1
WHI/BLU to Motor L1
WHI/GRN to Timer L4
P610
10171 121597