Akai CD-57 - Page 5

lil.REPLACEMENT
OF
PRINCIPAL
COMPONENT
When removing the motors (spindle motor, loading motor,
sled motor) or pick up block for replacement, be sure to
remove the mecha block and disc clamper first.
MAIN PCB
In
LOADING GEAR
PRECAUTIONS:
To prevent damage to the LD (laser diode) during removal
of the mecha block, please follow the following precau-
tions:
e When removing the MAIN PCB's P2 or P3 connectors,
first
short
the
short
points
on
the
pick
up
block’s
PCB
with solder as shown Fig. 3-1.
When
replacing
the
pick
up
block
with
a
new
one,
or
when
installing
the
mecha
block,
first
install
the
P2
and
P3
connectors
and
then
remove
the
solder
from
the
short
points
to
open
them.
PICK UP Fig 3-2
3-2.HOW TO REMOVE THE DISC CLAM-
PER
1) Move the disc drawer forward by turning the loading
gear counterclockwise.
2) Remove the disc clamper spring ©.
3) Lift the disc clamper up slightly and move it to the left to
remove it.
Bottom View
P2, P3 DISC CLAMPER
TO MAIN PCB DISC CLAMPER
SHORT POINT (3) © SPRING(B)
BE SHORTED
BY
SOLDER
Fig 3-1
3-1.HOW TO REMOVE THE MECHA
BLOCK
1) Remove the mecha block's retaining screws ®.
2) Turn the mecha block over and short the pick up block's
short points with solider. (Refer to the precautions.)
3) Remove the P2, P3, PS and P6 connectors on the MAIN
PCB. Te Se