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REPLACEMENT
OF CD MECHANISM
.
Note that the mechanism
of the CD player is very delicate.
It is very important
that the spindle motor (which rotates the disc), and the sled motor (which cases the disc signals to be
tracked),
as well as the gear and other
components,
operate
smoothly,
without
eccelen{riclty.
when
handling
the
pickup,
take
care
not to exert
excessive
force, and particular
care should be taken not to touch the lens
or the drive circuit's
P. W. Board pattern.
1. Replacement
of the
spindle
motor
.
First,
prepare
the
new
turntable
(C M3-2)
and
new
special
washer
(C M3-4)
for replacement.
CM3-2
The removed turntable
will be deformed
by the heat of the
soldering
iron, and cannot be reused.
CM3-1
.
Prepare
dial type
calipers.
(l) The attached
bonding
material
can be dissolved
by
using a
60 W soldering
iron to heat the shaft at the under part of
the turntable
(CM3-2) for about one minute.
(2) The turntable
can then be removed
from the shaft by very
carefully
applying
force upward at the center of the lower
surface of the turntable.
(3) Remove the two screws (CM3-3) and remove
the spindle
CM3-5
motor
(CM3-5).
(4) Attach the special washer (CM3-4) to the spindle motor.
(5) Apply
a small
amount
of a mixture
of the "Three
Bond
2001
and 2015F"
bonding
materials
to the motor's
shaft.
(6) Initial
the turntable
as shown in the figure. Secure the turn-
table by pressing gently. Be sure to wipe away (by using a
price
of cloth,
or similar
material)
any bonding
material
coming out of the hole.
Don't
attached
bonding
mater
Ial
at the
top of ;haft
I
UT
I
@
110
iol
\-
i
1
'CM2
(SHAFT)
u u
Be sure to w!pe away
the bonding
material.
\
CH~CK
PULLEY
mm
T)
2.
Confirm
of
inclination
for the turntable
(l) Connect the digital voltmeter
as shown in the figure.
(2) Set the test disc (YEDS 18 = SONY or etc.), press the
PLAY button (Playback for the most inner music).
F+
+
(3)At this time, record voltage value to indicate
at the digital
voltmeter.
10 kohm
Unit
Digital
(4) Access
the most
outer
music,
press
the
PLAY
button
0.0033PF
Voltmeter
(Playback for the most outer music).
A
(5) Again at this time, record voltage value to indicate
at the
Vc
digital voltmeter.
Low Pass
Filter
(6) For reference
at the recorded
voltage
of the most inner
music, Confirm at t 300 rnV less than for recorded
voltage
of the most outer music
-5-
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