Parts Exchange; Printed Circuit Board Exchange - AMSTRAD PC1512 Service Manual

4.
Parts
Exchange
4-1 Printed Circuit
Board
Exchange
(See Figure
4-1)
4-1-1
Printed Circuit
Board Removal
a)
Expand
the
two
shield
board
pins
and
cord holder
pin.
b)
Unfasten the three
fix
screws and remove
the shield board.
c)
Disconnect the
connectors
(head,
stepping motor, spindle motor, track sensor, index sensor,
and
write protect sensor).
d)
Unfasten the three printed
circuit
board
fix
screws.
e)
Moves
'.he
head
to
inner about
10mm.
f)
Lift
the
rear
edge
of
the
printed circuit
board and
pull
it
back.
4-1-2 Printed
Circuit
Board Mounting and Adjustment
a) Tilt
the
printed
circuit
board as
if
to
lower the
front
edge,
insert
the front
LED
into
the
LED
insertion
hole on the
front plate,
then lower
the rear edge.
b)
Fix
the printed
circuit
board
with
three screws.
c)
Secure
the shield
board
with three
fix
screws.
d)
Reconnect
the
disconnected connectors
(head,
stepping motor, spindle motor, track sensor,
index
sensor,
and
write protect sensor).
e)
Bend
the
two
shield
board
pins
and
fix
the
head
cable.
f)
Check
the spindle
speed
(5-1),
radial
track
(5-2),
track
sensor
(5-3),
azimuth
(5-4),
index burst
time
(5-5),
level
(5-6),
resolution
(5-7),
symmetry
(5-8)
and write protect
sensor
(5-9) after
mounting.
Note: Insert the
head
cord
under
the shield
board
and
fix at
the
same
routing
as before exchange.
Fig.
4-1
Printed Circuit
Board Removal
4-2 Lever
Exchange
(See Figure
4-2)
4-2-1 Lever
Removal
a)
Set
the lever horizontally.
b)
Unfasten
the
fix
screw
of
the
lever.
c)
Pull
the lever forward.
4-2-2 Lever Mounting
a)
Place the
wide
part
of
the lever
cam
on
the
hub side
and check
that the lever shaft hole
can be
seen from above.
(Hub open
state).
b)
Set the lever horizontally
and
insert
from the
front.
c)
Secure
the lever with a screw.
4-3
Front Plate
Exchange
(See Figure
4-3).
4-3-1
Front Plate
Removal
a)
Remove
the lever
as described
in
4-2-1.
b)
Unfasten the
two
front
plate
fix
screws.
c)
Pull
the
front
plate forward.
^
4-3-2 Front Plate Mounting
a)
Insert
the
front plate
from the
front.
b)
Secure
the front plate with
two screws.
Mount
the lever
as described
in
4-2-2.
4-4
Eject
Assembly Exchange
(See Figure
4-4)
4-4-1
Eject
Assembly
Removal.
a)
Make
the
lever vertical
(clamp
state).
b)
Remove
the printed
circuit
board as described
in
4-1-1.
c)
Insert protection
paper
(high quality
white paper approximately
10x30 mm)
between
the
heads
to protect
them.
d)
Unfasten
the
two
Eject
Assembly
fix
screws.
e) Lift
the top
head
(approximately 2
-
3 mm),
and remove
the
Eject
Assembly.
4-4-2 Eject Assembly Mounting and Adjustment.
a) Lift
the top
head and
insert
the Eject
Assembly under the
Head
Arm.
b)
Adjust the
position of eject
assembly
that
the ejector lock
when
the diskette
is
inserted
and
the
diskette
is
ejected
when
the lever
is
operated and secure the
eject
assembly
with
two screws.
c)
Remove
the protection paper.
d)
Mount
the printed
circuit
board as described
in
4-1-2.
8