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REPLACEMENT
H
OF CD MECHANISM
6. Resetting
the pickup
to
the
home
position
(l) The
limit
switch
is switched
ON
by the projection
of this
rack gear secured
to the returned
pickup,
after which the
sled motor
continues
to operate
(by the circuit
) for ap-
proximately
30 msec. : there is then again a
reverse
opera-
tion,
and
movement
to the
position
at which
the
switch
is
switched
OFF.
(2) Rotation
continues
for about 30 msec. after the switch
is
switched
OFF, and then the pickup
stop at home position.
(
\CM7
CONFIRM
OF CD SECTION
1.
Preparation
Measuring instruments and Test
disc.
(l)TEST
DISC
: YEDS
18 (SONY)
(2) OSCILLOSCOPE
: SS5711
(10 MHz
and Dual Phenomenon)
I
NOTE :
CD section
of this
unit
can
not need adjustment,
be-
cause CD P. W. Board checked
at automatic
check-
er.
2. Confirm of general operation
I
I
(1)
Set the test disc.
(2) Press the PLAY button,
then confirm
the disc rotating
to
clockwise direction.
(3) Press the FFWD or REW button, then confirm the most in-
ner music or most outer music accessing
at speedy.
(4) Press the STOP
button.
cl)
%+fi%H~
L~
J
Il;
l',
0
r
3. Confirm of eye pattern
~
L
1
(l) Connect
an oscilloscope
to pin
41 (RF) of IC101
and J141O
(VR).
(2) Set the test disc, press the PLAY button.
(3) Check to be sure that the "eye"
pattern
is at center
of
waveform
and that the diamond
shape is clearly defined.
(4) Press the STOP
button.
ICI
01
,PIN4%
+
o
'R("~
D
VOLT/ DIV-500mVl
LXV
-7–
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