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ADJUSTMENT
CAUTION
Pickup (KSS-240A} is adjustment free in repairing,
please don't disassemble and adjust it.
Tracking balance
VR2
Apply the sensor
section of the optical
power
aeter
on
the
pickup lens.
LASEK
POSER
Test disc
Type
4
Apply signal of
1.0kHz,
0.1¥res to
CNS pin 2 and 3.
(X32-)
Test dise
Type 4
Apply signal of
1.CkHz.
0. 1¥ras to
CNS pin 5 and 6.
(X32-)
(MOTE) Type 4 dise : SONY YEDS-18 TEST DISC or equivalent.
LPF: around 47kohas-3SCpF or so.
Connect
a LPF to CNS
pin
2-3,
to which
or two AC voltaeters,
(X32-)
Connect a LPF to CK5
pin 5-6, to which
TRACKING GAIN
or two AC voltaeters.
(X32-)
(a) Laser Power
0.08 ~ 0.15mW
Optical power meter
connect
an oscilloscope
connect
an oscilloscope
Short-circuit
patterns TEST and
enter the test aode.
Press the MANUAL
&
(>) to nove the
pickup
outwards,
Short-circuit
patterns CHECK.
The LD esets
ligh
Then,
confira that
the display
is "03"
(X32-)
Press the PLAY ke
Confirm that the
display
is "05".
(X32-)
Press the PLAY ke
Confirm that the
display
is "05°.
(X32-)
(b) Focus Gain, (c) Tracking Gein
Focus gain:
Tracking gain :
DP-1001
ADJUSTMENT
* RF signal and E.Spot signal in test mode (PLAY).
e If the diffraction grating has been adjusted properly, the influ-
ence of triggering is observed on the E.Spot waveform of ap-
ze -
cu
Sh)
ATL: +
O%
a
OFS
Nh
RS
Rage
grin eR
REST
e
WE?
Focus bias
KSS~ 240A
VR3
CHI
pox. 16us after RF signal, in the form of a projection.
RF signa!
RF level LD POWER
VR1
—~ 0(V)
«— VREF
CH2
TE sigan!
On the power from
0.08 to 0. 15n¥. when
the diffraction
grating is correctly
¢ RF signal and T.Error signal; in test mode (Focusing ON). (Disc
a ligned with the RF
CH1
type 4)
level of 1.5¥p-p or
RF signal
more and the TE
(servo open) level
of 1.5Vp-p
or sore,
the pickup
is
acceptable.
=~
OV)
FOCUS GAIN
Two VIVMs should
«— VREF
VR2
read
the same
value.
(X32-)
CH2
TE signal
TRACKING GAIN
Two Y¥YT¥Ms should
VR1
read the same value.
(X32-)
0%
aA: O.Sps
* RF signal in test mode (PLAY).
RF signal
11
12
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