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ation: main board —component side—
BOARD] (COMPONENT
SIDE)
i
p= of
2)
PE oc
LPF82
LPF81
RV81
FM TUNED
INDICATION
LIGHTING
LEVEL ADJ
IFT 82
FM DISCRIMINATOR
ALIGNMENT
TP81
C81
RV82
MW (AM) TUNED
INDICATION
LIGHTING
LEVEL ADJ
CD SECTION
Note:
1.
CD Block basically constructed to operate with-
out
adjustment.
Therefore,
check
each
item
in
order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise
indicated.
Use the oscilloscope
with
more
than
10M
im-
pedance.
4.
Clean an object lens by an applicator with neutral
detergent
when
the
signal
level
is low
than
specified value with the following checks.
S Curve Check
oscilloscope
BD
board
ee
TP (FEO)
ot—70 >
TP (VC)
O———o-
Procedure :
1.
Connect oscilloscope to test point TP (FEO) on
BD board.
2.
Connect between
test point TP (FES) and TP
(VC) by lead wire.
3.
Turned
Power switch on and actuate the focus
serch. (actuate the focus serch when disc table is
moving in and out.)
4.
Check
the oscilloscope
waveform
(S curve) is
symmetrical between A and B. And confirm peak
to peak level within 341Vp-p.
S curve waveform
symmetry
within
3+1Vp-p
5.
After check, remove
the lead wire connected
in
step 2.
Note:
« Try to mesure
several
times to make
sure
that the ratio of
A: B or B: A is more than
10: 7.
* Take sweep time as long as possible and light
up the brightness to obtain best waveform.
=A5 =
RF Level Check
oscilloscope
BD
board
TD
TP (RF) O—0F
TP (VC) O=—0-
Procedure :
1.
Connect oscilloscope to test point TP
(RF) on
BD board.
2.
Turn Power switch on.
3.
Put disc (YEDS-18) in and playback.
4.
Confirm that oscilloscope waveform
is clear and
check RF signal level is correct or not.
Note:
Clear RF signal waveform means that the shape "oO"
can be clearly distinguished at the center of the wave-
form.
VOLT/DIV : 200mV
TIME/DIV
: 500nS
RF signal waveform
f,
X)
VAAKAAAK?
WANN | 482 veg
AAA
i" a
(AKK)
Mi
E-F Balance Check
oscilloscope
BD board
i
aed
TP (TEO)
Ot —/0F
TP(VC)
O—=——o-
Procedure:
1.
Connect test point TP (ADJ) to ground and TP
(TEO) to TP (VC) with lead wire.
2.
Connect oscilloscope to test point TP (TEO) on
BD board.
.
Turn Power switch on.
4.
Put disc (YEDS-18) in and playback.
5.
Confirm
that the osilloscope
waveform
is sym-
metrical on the top and bottom in relation to OV,
and check this level.
Traverse oscilloscope
symmetry
level: 2£1Vp-p
6.
Remove the lead wire connected in step 1.
—33—
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (PCLK)
with lead wire.
6-1. SEMICONDUCTOR LEAD LAY
CXA1372AQ
fi
t
Main board
requency counter
car |
Co)
TP (PCLK) T=
2.
Turn Power switch on.
3.
Confirm that reading on frequency counter is
4. 3218MHz.
(TOP VIEW)
CXD2500AQ
Focus/Tracking Gain
This gain has a margin, so even if it is slightly off.
There is no problem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical cen-
ter position when you
moved and do not know
original position.
GP1U59XB
Ln
1 Vout
2 Vee
3 GND
Adjustment Locations :
(BD board)
LA6525M
0
16
1
5
(TOP VIEW)
M5218AFP
a
1
16
PST572E
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