Rf Level Check; E-F Balance Check; Focus/Tracking Gain Adjustment (Rv102, Rv103); [Bd Board] – Conductor Side - Sony HCD-H11 Service Manual

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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
2.4±0.7Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Try to measure several times to make sure that the ratio of
Note : r
A : B or B : A is more than 10 : 7.
Take sweep time as long as possible and light up the brigh-
r
ness to obtain best waveform.
Adjustment Location : BD board. (see page 15)

RF Level Check

TE
BD board
L 13942296513
TP (RF)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and press the ( button.
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.
RF signal waveform
Adjustment Location : BD board. (see page 15)
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symmetry
A
within 2.4 ± 0.7Vp-p
B
oscilloscope
+
–
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.3 ± 0.3Vp-p
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8

E-F Balance Check

BD board
TP (TEO)
TP (VC)
Procedure :
1. Ground main board IC101 (pin (£) with the lead wire.
2. Connect oscilloscope to test point TP (TEO) on BD board.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and press the ( button.
5. Confirm that the osilloscope waveform is symmetrical on the
top and bottom in relation to 0V, and check this level.
Traverse waveform
0V
specified value :
6. Remove the lead wire connected in step 1.
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Focus/Tracking Gain Adjustment (RV102, RV103)

This gain has a margin, so even if it is slightly off. There is no prob-
lem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position when
you moved and do not know original position.
Adjustment Location :
[BD BOARD] – Conductor side –
IC102
FOK
TEI
IC101
RF
RV101
co
.
– 15 –
9 4 2 8
oscilloscope
(DC range)
+
–
level : 300 ± 100mVp-p
A–B
X100 = less than ± 7%
r
2 (A+B)
A+B = 300 ± 100mVp-p
r
0 5 8 2 9 9 4 2 8
PCK
FEI
RV102
FEO
m
VC
IC104
TEO
RV103
9 9
A
B
9 9
GND