Sony CDP-X229ES - Electrical Block Checking; RF Level Check Procedure; S Curve Check Procedure; E-F Balance Check Procedure

CDP-X229ES |
SECTION 2
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.
. Use the oscilloscope with more than 10MQ 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.
Ww
S Curve Check
oscilloscope -
BD board
———
TP (FE) ©
TP (VC) ©
Procedure :
1. Connect oscilloscope to test point TP (FE) on BD board.
2. Connect between test point TP (FEI) and TP (VC) by lead wire.
3. Turned Power switch on and actuate the focus search. (actuate the
focus search 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 3+1 Vp-p.
S
curve
waveform
symmetry
within 3+1Vp-p
5. 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 (RFQ)
TP (VC) ©
Procedure :
1. Connect oscilloscope to test point TP (RFO) 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 “ 0” can be clearly
distinguished at the center of the waveform.
VOLT/DIV : 50mV
TIME/DIV : 500nS
(10 : 1 probe used)
RF signal waveform
iereere
ARAB
Mi
vii ss Wh
E-F Balance Check
AAD
XX
f,
a
level :
+0.2
1.2 0.4
Vp-p
oscilloscope
BD board
——
TP (FE) ©
TP (VC) ©
Procedure :
1. Connect test point TP (ADJ) (on main board) to ground and TP
(TEI) to TP (VC) with lead wire.
. Connect oscilloscope to test point TP (TE) on BD board.
Turn Power switch on.
. Put disc (YEDS-18) in and playback.
. Confirm that the oscilloscope waveform is symmetrical on the top
and bottom in relation to OV, and check this level.
APR wWN
Traverse oscilloscope.
ug
wil a
OV
ATR
symmetry
Level : 2£1Vp-p
6. Remove the lead wire connected in step 1.