Bunn G1 Operating & Service Manual - page 13
13
17. Install grind selector dial plate (18) with adjusting
screw w/bearing (19) onto the grind chamber and
secure with two .250”-20 screws (1).
18. Install grind selector knob (17) onto the grind
selector dial plate (18).
NOTE: Refer to ADJUSTMENTS and reset the burrs.
SERVICE (cont.)
DC MOTOR AND GRIND CHAMBER - G1MD ONLY
FIG. 7 DC MOTOR AND GRIND CHAMBER
P1706
Location:
The motor is located inside the upper part of the
grinder housing.
Test Procedures:
1. Remove the rear panel. Press the red “Reset”
button visible on the rear of the motor. Listen
carefully for a “click”. This resets the motor pro-
tection circuit and may indicate that something
other than coffee was inserted into the hopper
for grinding.
If the grinder remains unable to start, proceed to
#2.
If the grinder stops operating shortly after starting,
refer to removal and replacement instructions and
inspect for foreign materials.
2. Disconnect the grinder from the power source
and place a coffee bag behind the dispense
chute.
3. Remove the black wire from the rectifier (+)
terminal and the red wire from the (-) terminal.
4. Check the voltage across the (+) and (-) termi-
nals with a voltmeter. Connect the grinder to the
power source. When the Off/On/Start switch is
momentarily placed in the “START” (lower) posi-
tion and then left in the “ON” (center) position
and a bag is in place behind the coffee dispense
chute. The indication must be approximately 108
volts dc.
5. Disconnect the grinder from the power source.
If voltage is present as described replace the motor.
If voltage is not present as described, reconnect the
white or red and white/blue wires to the motor, refer
to the Wiring Diagrams and check the grinder wiring
harness.
Removal and Replacement - Motor (Refer to Fig. 9)
1. Disconnect all wires from the motor.
2. Remove the two .250”-20 screws (1) securing
grind selector dial plate and grind selector knob
(2) to the grind chamber. Remove dial plate and
selector knob as an assembly.
3. Slide burr (7), auger rotor/spring assembly (3)
and burr rotor disc (4) off the grinder motor shaft
as an assembly.
4. Remove the two .250”-20 screws (8) securing
the stationary burr (9) to the grind chamber.
5. Remove bushing (10) and washer (11) from the
grinder motor shaft.
6. Remove the two #8 thread forming screws (12)
securing the fill plate (13) to grinder housing and
remove plate (13).
7. Remove the four #10-24 screws (14) securing
the chute assembly (15) to the grind chamber
and remove chute assembly (15).
8. Disconnect all the wires from the rectifier (23).
9. Remove the four .312”-18 screws (20), rubber
washers (22) and flat washers (21) securing
the motor and bracket to the grinder housing
bracket.
AC MOTOR AND GRIND CHAMBER (cont.)
10191 011500