Bunn G9 HD Operating & Service Manual page 11

SERVICE (cont.)
Off/On/Start Switch
URN
O
F
F
CARAFE
Location:
The Off/On/Start switch is centered in the housing
above the upper front inspection panel.
Test Procedure:
1. Disconnect the grinder from the power supply.
2. Remove the black wire from the switch.
3. Check for continuity across the black wire from the
Off/On/Start switch and the left blade of the cordset
connector (see illustration below).
CORDSET CONNECTOR
Looking Strait-on
Black
If continuity is present as described, proceed to step
4.
If continuity is not present as described, refer to the
Wiring Diagrams and check the grinder wiring har-
ness.
4. Remove the remaining wires from the switch.
5. Check for continuity across the lower terminals
when the switch is placed in both the "ON" (center)
and "START" (right) positions.
If continuity is present as described, proceed to step
6.
If continuity is not present as described, replace the
switch.
6. Check for continuity across the upper terminals
when the switch is placed in the "START" (right)
position only.
ON
S
T
A
R
T
White
Ground
If continuity is present as described, the Off/On/Start
switch is operating properly.
If continuity is not present as described, replace the
switch.
Removal and Replacement:
1. Remove all wires from the switch terminals.
2. Compress the clips inside the front wrapper and
gently push the switch through the opening.
3. Push the new switch into the opening and spread
the clips to hold the switch captive in the hood.
4. Refer to the illustration below when reconnecting
the wires.
P1300
Urn/Carafe Switch
Location:
The Urn/Carafe switch is located to the left side on
the front of the housing above the upper inspection
panel.
Test Procedure:
1. Disconnect the grinder from the power supply.
2. Remove the tan, yellow and green wires from the
switch.
3. Place the switch in the "CARAFE" position; check
for continuity across the pink and the tan wire
terminals, also across the orange and the yellow
wire terminals.
If continuity is present as described in both checks,
proceed to step 4.
If continuity is not present as described in one or both
of the checks, replace the switch.
4. Place the switch in the "URN" position; check for
continuity across the orange and green wire ter-
minals.
If continuity is present as described, the switch is
operating properly.
Page 11
WHI/YEL to Timer TL5
WHI/ORA to Timer TL3
BLK to Cordset
WHI/RED to Timer TL1
P606
10171 041597