Service (cont.), Wiring diagrams, Ri gh t – Bunn G9-2T HD User Manual
Page 14
1 4
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
DI
SP
EN
SE
TI
ME
(S
ec
on
ds
)
DI
SP
LA
Y
Inc
rea
se
De
cre
as
e
Readout will be displayed for 5 minutes.
Timer can only be adjusted
while readout is displayed.
+
W
AR
NIN
G
HA
ZA
RD
OU
S V
OL
TA
GE
UN
PL
UG
G
RI
ND
ER
BE
FO
RE
R
EM
OV
IN
G
RI
GH
T
DI
SP
EN
SE
TIM
E
(S
EC
ON
DS
)
3.2
6
10
15
20
25
30
32
3.2
.4
.4
1
1
2
2
3
3
4
6
10
15
20
25
30
32
4
LE
FT
HI
GH
UN
PL
UG
G
RI
ND
ER
BE
FO
RE
R
EM
OV
IN
G
W
AR
NIN
G
HA
ZA
RD
OU
S V
OL
TA
GE
HIG
H
LO
W
HI
GH
HIG
H
LO
W
LO
W
LO
W
O N
OFF
O N
OFF
P609
P610
Grinders with Analog Timer
Grinders with Digital Timer