Sanyo DC - CD ADJUSTMENT; 2. Other Adjustment of Tracking Balance (SVR11); 3. Focus Gain Confirmation; 4. Tracking Gain Confirmation

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CD ADJUSTMENT
2. Other Adjustment of Tracking Balance (SVR11)
~-=~-l’ “
1.
2.
3.
4.
Set the service mode(CD tracking balance adjusting mode).
Enter this mode by pressing the PLAY/PAUSE key during
TP1
the service mode entry state. Pressing the PLAY / Pause key
(RF)
in this state turns on the tracking servo and causes playing
to begin. (See service mode)
Connect the oscilloscope to TP3 (TE) and TP4 (GND).
Adjust SVR1 1 so that the
TE (Traverse) signal waveform of
TP3
Ov
TP3 on the oscilloscope is vertically symmetrical relative to
(TE)
OV. Or may adjust SVR11 so that the DC voltage : (Peak
Hold
Level) - (Bottom Hold Level) of the traverse signal is
OV. (See figure right side)
If it were not for obtain waveform at the right figure, re-
peat item 2-1 -2-3.
3. Focus Gain Confirmation
1. Connect the storage scope to TP2 (F.E : Focus Error) 4. Set the output of AF oscillator to 400 Hz, 0.5V rms and
through the Band pass filter. (See BPF Figure)
connect to pin 24 (IC101) through the resistor : 120k ohms.
2. Turn on the power of the unit.
5. Confirm so that the voltage of the F.E signal waveform
3. Play-back the test disc.
on the storage scope is 0.5V p-p, f 3db by through BPF.
‘If this
Disc.
CONFIRMATION is imperfect, become weak the mechanical shock, inferior playability, and can not playback the
. .
AF OSCILLATOR MAIN PCB
OSCILLOSCOPE or STORAGESCOPE
400Hz
120K
BAND PASS FILTER
~ Iclol
1.
J e-.
.-
0.5; rms -
DIM 74
TP2
(FE)
=
=
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1
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4. Tracking Gain Confirmation
1. Connect the storage scope to TP3 (T.E) through the Band
4. Set the output of AF oscillator to 400 Hz, 0.5V
rms and
pass filter. (See BPF Figure).
connect to pin 14( IC101) through resistor 47k ohms.
2. Turn on the power of the unit.
5. Confirm so that the voltage of T.E signal waveform
3. playback the test disc.
storage scope is 0.5V p-p, f 3db by through BPF.
‘If this CONFIRMATION is imperfect, become weak the mechanical shock, inferior playability, and can not playback the Disc.
AF OSCILLATOR MAIN PCB
OSCILLOSCOPE or STORAGESCOPE
400Hz
47K
BAND PASS FILTER
Iclol
0.5V rms
PIN 14
TP3
(TE)
Iu ~ _E–.
=
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on the