11.
Replaee
with a new
potentiometer
and
reassemble
in
reverse
order
of
disassembly.
Refer
to
drawing number 0208-201 (Q55)
or
0221-201 (Q65) for wire
arrangement.
12.
When
the
grade
potentiometer,
the
wires
and
the
setscrews
are
in place,
calibrate
the
grade
potentiometer
using
the
procedure in
Section
5.4.4.
13.
Calibrate
grade
(Section 5.4.2).
5.2.1.8 Printed
Circuit
Board (PCB) 2A1
Replacement
1.
Perform
the
procedure in
Section
5.2.1.
2. Unplug all
connectors
the
the
PCB,
including 2Al PI
1.
3. Push the wire assemblies behind
the
PCB
bracket.
4. Remove
the
eight
bolts
that
hold
the
PCB
to
the
PCB
bracket.
5.
Replace
with a new PCB and reassemble
in
reverse
order
of
disassembly.
Refer
to
drawing number 0208-201 (Q55)
or
0221-201
(Q65)
for
wire
arrangement.
6.
Recalibrate
speed (Section 5.4.1), grade
(Section 5.4.2) and
the
trip
level
potentiometer
(Section 5.4.3).
5.2.1.9 Drive
Motor
Contactor
2K1
Replacement
1.
Perform
the
procedure in
Section
5.2.1.
2.
Note
the
color and
arrangement
of
wires
to
contactor
2Kl.
3.
Remove
the
wires
to
the
contactor,
including two wires
to
the
motor, two wires
to
the
power supply,
two
wires
to
2AIP10, and
three
wires
to
2AIP2.
4.
Replace
with a new
contactor
and
reconnect
the
wires.
Refer
to
drawing number
0208-201 (Q55)
or
0221-201 (Q65) for wire
arrangement.
5-4
WARNING I
Do
not
wear loose clothing around
rotating
machinery.
High
voltage
is
present when
the
treadmill
cable
is
plugged in.
5.
Restore
power
to
the
treadmill
and
test
the
operation
of
the
new drive
motor
contactor.
6.
Unplug
the
treadmill
and
replace
the
hood
and handrail.
5.2.2 Disassembly
to
Remove
the
Input
Shaft Assembly
1.
With
the
treadmill
on,
decrease
speed
to
minimum.
2.
Unplug
the
treadmill,
remove
the
handrail, and
lift
the hood
straight
up
off
the
treadmill.
Exercise
caution
to
avoid
damage
to
bearings and
caps
on
the
input
shaft.
If
the
input
shaft
is
scarred
or
if
the
moveable sheave is frozen on
the
input
shaft,
the
entire
shaft
assembly must be
replaced.
NOTE
A
replacement
input
shaft
assembly
can
be
obtained
from Quinton Medical
Company's
Service
Department.
3.
Take a rope
or
flexible
belt
and put
it
around
the
variable speed
belt.
Pull
straight
up
to
loosen
the
belt.
Figure 5-1
illustrates
the
loosening
of
the
variable speed
belt.
4.
Remove
the
V-belts from
the
machined
pulley.
5. With
an
air
wrench
or
a
ratchet
wrench
with a long extension, remove
the
four
bolts
that
hold
the
bearing
caps
in place.
Set
the
fan
aside.
6.
Lift
the
whole assembly
straight
up and
forward, avoiding
damage
to
the
speed change
motor,
output
shaft,
or
walking
belt.
Note
that
the
bearing
caps
are
upside-up
if
the
narrow
side
is down.
5.2.2.1
Input
Shaft Assembly Replacement
1.
Perform
the
procedure in Section 5.2.2.
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