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14
SERVICE (cont.)
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 slotted head screws beneath the timer
dial.
Test Procedure:
1. Unplug the grinder.
2. Check the voltage across the red/black and
white/green wires of the relay coil with a volt-
meter when the Off/On/Start switch is pressed
to the “START” (lower) position and released.
Plug-in the grinder. The indication must be 120
volts ac for the approximate setting on the timer.
3. Unplug the grinder.
If voltage is present as described, reconnect the
red/black and white/green wires to the relay coil, and
proceed to #4.
If voltage is not present as described, refer to
the
Wiring Diagrams
and check the grinder wiring
harness.
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 pressed to the
“START” (lower) position and released. Plug-in
the grinder. Continuity must be present for the
approximate setting on the timer.
6. Unplug the grinder.
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 following illustration when recon-
necting the wires.
WHI/RED to
Timer P4-6
WHI/BLU to
Motor L1
RED/BLK to
Timer P4-7
WHI/GRN to
Timer P4-3
D
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Readout will be displayed for 5 minutes.
Timer can only be adjusted
while readout is displayed.
+
W
A
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2
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2
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3
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3
.
2
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4
.
4
1
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2
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3
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4
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4
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F
F
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F
F
P609
P610
Grinders with Analog Timer
Grinders with Digital Timer