Lever Frame Assembly Exchange; Head Assembly Exchange - AMSTRAD PC1512 Service Manual

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4-5
Lever
Frame Assembly Exchange
(See Figure 4-5)
4-5-1 Lever Frame Assembly Removal
a)
Remove
the printed
circuit
board as described
in
4-1-1.
b)
Remove
the
lever
as described
in
4-2-1.
c)
Remove
the
front plate
as described
in
4-3-1
d)
Remove
the
eject
assembly
as
described
in
4-4-1.
e)
Unfasten
the four lever
frame assembly
fix
screws.
f)
Lift
the
lever
frame assembly
slightly
making sure
that
the top
head
is
not
raised,
and remove
the
slidinh to the
left.
4-5-2 Lever
Frame Assembly
Jvlounting
and
Adjustment.
a) Lift
the top
head
slightly
and
slide
the
pad mounting
part of
the lever
frame assembly under the
top head.
b)
Secure
the
lever
frame
assembly
with four screws.
c)
Mount
the eject
assembly as described
in
4-4-2.
d)
Mount
the
front
plate
as described
in
4-3-2.
e)
Mount
the lever
as described
in
4-2-2.
f)
Unfasten the
two screws
of
hub
shaft holder
and centre by
moving
the
hub up and
down
several
times
and secure
the
two
screws.
g)
Mount
the printed
circuit
board ad described
in
4-1-2.
h)
After
mounting, adjust the index burst
time.
(Refer to
5-5).
4-6 Stepping Motor Assembly Exchange
(See Figure 4-6)
4-6-1 Stepping Motor
Assembly Removal
a)
Remove
the printed
circuit
board as described
in
4-1-1.
b)
Unfasten the
head assembly
metal
belt
fix
screw.
c)
Unfasten the stepping
motor
belt
fix
screw and remove
the
keep
plate.
d)
Unfasten
the
two stepping
motor assembly
fix
screws.
e) Lift
the stepping
motor assembly upward,
then
slide
it
to
the
left
to
remove from the metal
belt.
f)
Disconnect the stepping
motor assembly cord from the hook.
4-6-2 Stepping Motor Assembly Mounting Adjustment
a)
Keep
the metal
belt
in
the loop form,
insert
the stepping motor assembly,
mount
the metal
belt
and keep
plate with
screws.
b)
Align the oval hole
of
the stepping motor mounting plate with the guide
pin
and mount
the
stepping
motor assembly
with
two
screws.
Temporary
tightening
of
screws
are required.
c)
Pull
the
tip
of
the metal
belt
and mount
the metal
belt
on
the
tip
of the
head assembly
with
a screw.
d)
Move
the
head assembly back and
forth
and check
that the metal
belt
is
not twisted.
If
twisted,
slightly
loosen the metal
belt
fix
screws on the stepping
motor assembly and head assembly, and
move
the
head assembly back and
forth
several times.
Fasten
the
screws
tightly.
e)
Place the stepping
motor assembly
cord
on
the hook.
f)
Mount
the printed
circuit
board as described
in
4-1-2.
g)
Adjust the
radial track after
mounting. (Refer
to
5-2).
Caution:
Do
not reuse the metal
belt
removed from the head assembly.
4-7
Head
Assembly Exchange (See
Figure 4-7)
4-7-1
Head Assembly Removal
a)
Remove
the printed
circuit
board as described
in
4-1-1.
b)
Remove
the
lever
as described
in
4-2-1
c)
Remove
the
front plate
as described
in
4-3-1.
d)
Remove
the eject
assembly
as
described
in
4-4-1.
e)
Remove
the lever
framne assembly as described
in
4-5-1
f)
Remove
the stepping
motor assembly as described
in
4-6-1.
g)
Unfasten the
PCB
post
fix
screws and remove
the
PCB
post.
h)
Unfasten
the
two screws fastening the guide
shaft
keepers
A and B and remove keepers A and
B.
i)
Lift
the guide shaft rear
edge and remove
the
guide
shafts
in
a
backward
direction, individually.
Be
careful not to
damage
guide
shafts or
mix the
right
and
left
shafts.
j)
Carefully
remove
the
head assembly.
4-7-2
Head Assembly
Mounting and Adjustment
a) Fit
the
two guide
shafts
in
the
head assembly without mixing the
right
and
left,
and mount
in
the
housing
while holding the
guide
shaft.
b)
Secure
guide shaft
keepers
A
and B
using four
screws.