Bunn G1 Operating & Service Manual - page 9
9
CONTENTS
Bag Sensor Switch ............................................ 9
Motor and Grind Chamber (AC) ....................... 10
Motor and Grind Chamber (DC) ....................... 13
Off/On/Start Switch .......................................... 16
Rectifier ........................................................... 17
Relay................................................................ 18
Wiring Diagrams ......................................... 20,21
CLEANING LEVER
CLEANING LEVER
GR
OUND
COFFEE
1. Select the desired grind.
2. Lift the lid and pour coffee beans into the hopper.
3. S
lip bag under the chute. Rest the bag on the tray.
4. Press the start sw
itch.
5. Flip the cleaning lever a few times as dispensing slows.
6. Rem
ove the bag. The grinder will stop automatically.
ST
OP
TU
R
K
IS
H
SP
EC
IA
L
R
E
G
P
E
R
C
E
L
E
C
P
E
R
C
A
U
TO
M
AT
IC
DRIP
FINE
ESP
RE
SS
O
This section provides procedures for testing and
replacing various major components used in this
grinder should service become necessary. Refer to
Troubleshooting for assistance in determining the
cause of any problem.
COMPONENT ACCESS
WARNING - Unplug the grinder before the removal of
any panel or the replacement of any component.
All components are accessible by the removal of
the top lid, hopper, and rear panel.
The top lid is attached with two #6-32 screws, the
hopper assembly is attached with four #6-32 screws
and the rear panel is attached with ten #8-32 screws.
SERVICE
FIG. 1 COMPONENT ACCESS
P1724
CLE
ANIN
G L
EVE
R
CLEANING LEVER
GR
OUND
COFFEE
1. Select the desired grind.
2. Lift the lid
and pour coffee beans
into
the hopper.
3. Slip bag
un
der the chute. Rest the bag o
n the tray.
4. Press the start sw
itch.
5. Flip the c
lean
ing lever a few
tim
es as disp
ensing slow
s.
6. Rem
ove the bag. The grin
der will stop autom
atically.
ST
OP
TU
RK
IS
H
SP
EC
IA
L
R
E
G
P
E
R
C
E
L
E
C
P
E
R
C
A
U
TO
M
AT
IC
DRIP
FINE
ESP
RE
SS
O
FIG. 2 BAG SENSOR SWITCH
P1704
Location:
The bag sensor switch is located inside the lower
front of the grinder housing behind the coffee dis-
pensing chute.
Test Procedure:
1.
Disconnect the grinder and place a coffee bag
behind the dispense chute.
2.
Remove the white/violet wire from the bag sen-
sor switch.
3.
Check the voltage across the white/violet wire
from the bag sensor switch and the white wire,
red/black wire or red wire on the relay coil with a
voltmeter. Hold the Off/On/Start switch in the
“START” (lower) position and connect the grinder
to the power source. The indication must be:
a. 120 volts ac for two wire 120 volt models.
b. 230 volts ac for two wire 230 volt models.
c. 240 volts ac for two wire 240 volt models.
4.
Disconnect the grinder from the power source.
BAG SENSOR SWITCH