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5. Tracking Offset Adjustment
Load the test disc YEDS-18 on the tray and play the
track 2. Turn
R132 to minimum
position. (Counter
clockwise)
Connect the oscilloscope between pin 3 (TR) of P107
and pin 2 (GND) of P106.
Adjust R108 until the center of tracking error signal
on the oscilloscope becomes GND
level.
Turn R132 to the mechanical center.
After adjustment, disconnect the oscilloscope.
P1o7 | 1
2
A
TR
3
Oscilloscope
GND level
4
B
A=B
P106
1
Vertical
: 1Vidiv.
Holizontal
: 2ms/div.
eNO)
[Re
DC, Ground Center
Photo 3
6. Focus Gain Adjustment
Set the output of AF
signal generator to 800Hz,
1-~1.5Vp-p.
Play the track 2 of test disc.
Connect the oscilloscope and the AF signal generator
as shown below.
AF _ signal
Oscilloscope
generator
GND
CH1
CH2
P107
GND
7
Vertical
: 0.5V/div
Adjust
R122 until 800Hz
components
of channels
1
Holizontal
: 0.5ms/div
and 2 on oscilloscope become same level.
After adjustment, disconnect the AF signal generator
and the oscilloscope.
7. Tracking Gain Adjustment
Set the output of AF signal generator to 1.2kHz, 1~1.5Vp-p.
Play the track 2 of test disc.
Connect
the oscilloscope and the AF signal generator
AF
signal
oscillator as shown below.
2
Oscilloscope
generator
GND
CH 1
-_ 2
$
:
A
F
a
|
T
P107
—|
P106
®
®@
®
®
GND
B
Vertical
: 1V/div.
Photo 5
Holizontal: 0.5 ms/div.
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