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UD-300
ADJUSTMENT
CAUTION
Pickup (KSS-240A) is adjustment free in repairing,
please don't disassemble and adjust it.
INPUT
SETTING
LASER POWER
*
Test disc
Type 4
Apply signal
of
1,0kHz,
0.1V¥rms
to
CN3 pin 2 and
3.
Test
dise
Type 4
Apply
signal
of
1.0kHz,
0.1¥rms
to
CN3 pin 5 and 6.
FOCUS GAIN
TRACKING GAIN
(NOTE)
Type
4 disc
LPF:
around 47kohms+390pF or so.
Adjustment
preedures
are
in TEST
MODE.
(a) Laser Power
0.08 ~ 0.15mW
Pickup
Optical power meter
3K HAVE TO TAKE AWAY THE SUB-CHASSIS(
AND PCB(
)From CD MECHA ASS'.
62
Tracking balance
VR2
O000
0
/
{e)
1}
KSS-240A
Focus bias
VR3
RF revel LD POWER
VR1
OUTPUT
SETTING
Short-circuit
pins
TEST and enter
the
test
mode.
Apply
the sensor
section of the optical
power
meter
on
the
pickup lens.
Press the play key
to check that
the LD emits light.
Then,confirm that
the display is "05"
LPF to CN3
to which
oscilloscope
voltmeters.
Connect
a
pin 2-3,
connect
an
or two AC
Confirm
that the
display
is "05".
Connect
a LPF
to CN3
pin 5-6,
to which
connect
an oscilloscope
or two AC voltmeters.
Confirm
that
the
display
is "05°.
: SONY
YEDS-18
TEST
DISC
or
equivalent.
Press
the PLAY key.
Press
the PLAY key.
FOCUS
VR2
GAIN
TRACKING GAIN
YRI
(b) Focus Gain and Tracking Gain
Focus gain:
Tracking gain :
)
1.0kHz
0.1Vrms
1.0kHz
0.1Vrms
CN3
PLAYER
ALIGNMENT
SETTING
POINT
ALIGN FOR
FIG.
On the power
from
0.08 to $.15m¥,
when
the diffraction
grating
is correctly
a ligned with the RF
level
of 1.5 Vp-p or
more aid the TE
(servo ojen)
level
of 1.5Vp-p or more,
the pickup
is
acceftab le.
Two VTVMs should
read
the same val ue.
Two YTVMs should read Cb)
the should value.
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