Sony CDP-S1 - Page 5

SECTION 3
ELECTRICAL BLOCK CHECKING
Note :
1. CD Block basically constructed to operate without
adjustment. Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise
indicated.
3. Use the oscilloscope with more than 10M? impedance.
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
O
Of— or
QOul-——O -
BD board
TP (FE)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FED and TP (VC) by
lead wire.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again
and actuate the focus search. (actuate the focus search
when disc table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within
3+1Vp-p.
S-curve waveform
symmetry
i within 3£1Vp-p —
6. After check, remove the lead wire connected in step 2.
Note: - Try to measure 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.
RF Level Check
oscilloscope
BD board
—
TP (RFO) O——oF>
TP (VC) ow—to-
Procedure :
1. Connect oscilloscope to test point TP (RFO) on BD board.
2. Turned 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 “©” can
be clearly distinguished at the center of the waveform.
VOLT/DIV : 200mV
TIME/DIV : 500nS
RF signal waveform
VAAKAAAAA? 9
RRR
AAA
\ WY N\YY)
¢
BA
0.2
level : 1.2 ae Vp-p
E-F Balance Check
oscilloscope
BD board
TP (TE)
TP (VC)
O<t-—o}
O=-—0 -
Procedure :
1. Connect test point TP (ADJ) to ground and TP (TEI) to
TP (VC) with lead wire.
Connect oscilloscope to test point TP (TE) on BD board.
Turned Power switch on.
Put disc (YEDS-18) in and playback.
Confirm that the osilloscope waveform is symmetrical
oF ee NS
on the top and bottom in relation to OV, and check this
level.
Traverse waveform
symmetry
level: 21Vp-p
6. Remove the lead wire connected in step 1.
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (PLCK) with
lead wire.
frequency counter
BD board
pe Cay]
TP (PLCK) O=t—+-0+
2. Turned Power switch on.
3. Confirm that reading on frequency counter is 4.3218MHz.