39
SERVICE (Cont.)
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 har-
ness.
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
MINUTES
BUNN-O-MATIC
P/N 2620- 12
0 VAC
MINUTES
BUNN-O-MATIC
P/N
2620-
120
VAC
P1312
Single set timer shown
Multi set timer (Urn/Carafe) similar
Relay (Early Model G-9)
FIG 38 RELAY
FIG 39 RELAY TERMINALS
41545 122209
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