12
Relay
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 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 oper-
ating 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 reconnect-
ing the wires.
WHI/BLU to Motor L1
WHI/GRN to Timer L4
WHI/RED to Timer TL1
P610
MINU
TES
BU
NN-O-MATIC
P/N
2620- 120 VAC
P1312
If continuity is not present as described, replace
the switch.
Removal and Replacement:
1.
Remove all the wires from the switch terminals.
2.
Compress the clips inside the housing and gen-
tly 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 reconnect-
ing the wires.
SERVICE (cont.)
TAN
PIN
YEL
ORA
GRN
P1318
Single set timer shown
Multi set timer (Urn/Carafe) similar
10171 121597
