Sharp FDD-412A - Page 74

FDD412A/B
(c) Install the motor (DD spindle) and PCB.
(d) Mount the top cover.
Pushbutton
ee Door button spring
Fig. 4.19 Door Button
4.2.18 FPH-H680T Assembly
(1) Tools and measuring instruments to be used:
#2 Phillips screwdriver
#1 Phillips screwdriver
Spring balancer (3 kg)
(2) Disassembling
(a) Disengage the head connector from the PWB (P5).
(b)
Remove
the
lead
wire
from
the
head
lead
wire
clamp
(see
4.2.3.).
(c)
Insert
clean
paper
between
head
sliders
to
keep
the
head from
contact.
(d)
Remove
the
top
cover
and
open
the
plate
according
to
4.2.1
and
4.2.2.
(e)
Detach
the
steel
belt
from
the
head
carriage
(M2.5x2).
(Using
paper
tape,
hold
the
steel
belt
a
taar
a
on
the
step
motor
pulley.)
(f)
Loosen
clamp
(guide
bar)
set
screws
(M4
x2),
extract
the
guide
bar,
and
remove
the
assembly.
At
this
time,
never
apply
force
onto
the
swing
arm.
(3) Assembling
(a) Insert the guide bar into the assembly.
(b)
Secure
the
guide
bar and
assembly
with
the
clamp
(guide
bar)
set
screws.
Keep
the
rear
end
of
the
guide
bar
flush
with
that
of
the
clamp.
(c) Mount the steel belt on the head carriage.
(i)
Loosen
a
screw
(M2
x1)
on
the
step
motor
pulley.
(ii)
Fix
teh
steel
belt
at
the
carriage
rear
end.
(ii)
Fix
the
steel
belt
temporarily
at
the
carriage
front
end.
(iv)
Engage
the
spring
balancer
in
a
hole
at
the
steel
belt
front
end.
While
pulling
the
balancer
straight
at
2.0
40.3
kg,
tighten
the
screw
at
the
carriage
front
end.
(v)
Move
the
carriage
twice
or
more
over
the
entire
stroke.
;
Then
tighten
the
screw
on
the
step
motor
pulley.
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