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FDD412A/B
4.2.19
Step
Motor
(1)
Tools
and measuring
instruments
to be
used:
#2 Phillips
screwdriver
#1 Phillips
screwdriver
Small
flat
screwdriver
(for
wire
removal)
Spring
balancer
(3 kg)
(2)
Disassembling
(a)
Remove
the PWB
according
to 4.2.4.
(b)
Remove
the
step
motor
wiring
from
the
J3
connector
according
to
23s
(c)
Detach
the
steel
belt
from
the
head
carriage
and
step
motor
pulley.
(d)
Remove
step
motor
set
screws
(M4 x.2)
to dismount
the
step
motor.
(3)
Assembling
(a)
Mount
the
step
motor
with
the
set
screws.
At
this
time,
press
it
in
the
arrowed
direction
(Fig.
4.22)
and
hold
it
temporarily.
(b)
Engage
the
steel
belt
through
the head
carriage
and
step motor
pulley.
(i)
(ii)
(iii)
(iv)
(v)
(vi)
Hold
the
steel
belt
temporarily
onto
the
step motor
pulley.
(Keep
the
screw
slack.)
Fix
the
steel
belt
at
the
carriage
rear
end.
Secure
the
steel
belt
temporarily
at
the
carriage
front,
end.
j
Engage
the
spring
balancer
in
a hole
at
the
steel
belt
front
end.
While
pulling
the
balancer
straight
at
2.0
+ 0.3
kg,
tighten
the
screw
at
the
carriage
front
end.
7
Move
the
carriage
twice
or
more
over
the
entire
stroke.
Then
tighten
the
screw
on
the
step
motor
pulley.
Move
the
carriage
again
over
the
entire
stroke,
and
check
that
the
belt
is
held
taut
and
straight...
(If
the
(c)
Install
the
step
motor
wiring
according
to 4.2.3
(wire
routing
shown
in
Fig.
4.5).
(d)
Mount
the PWB
according
to 4.2.4.
(4)
Adjustment
(a)
After
replacement,
perform
adjustment
according
to 4.3.1,
"Head
Position
(Tracking)
Adjustment"
and
4.3.2,
"0 Sensor
Adjustment".
~70—
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