DPC-781/782/981
4
ADJUSTMENT
No.
2
1
LASER
POWER
–
Apply the sensor
section of optical
power meter on
the
pickup lens.
Short the test land. Confirm
that the display is
" ".
Press FF Key and confirm
that the display is 03.
–
On the power from
0.08 to 0.15 mW,
when the diffraction
grating is correctly
aligned with the RF
level of 1.0 Vp-p or
more.
–
3
4
5
ITEM
FOCUS
ERROR
TRACKING
ERROR
FOCUS
GAIN
TRACKING
GAIN
INPUT
SETTING
Test disc
KTD-03
Test disc
KTD-03
Test disc
KTD-03 Apply
signal of
1.0kHz,
0.05Vrms
between
Check-land F1
and F2.
Test disc
KTD-03 Apply
signal of
1.0kHz,
0.05Vrms
between
Check-land T1
and T2.
OUTPUT
SETTING
Connect an oscillo-
scope as follows.
CH1:RF
(Check-land RF)
CH2:T1
(Check-land TE1)
Press the FF key.
Confirm that the display is
" ".
Connect a LPF
between Check-
land F1 and F2 to
which connect an
oscilloscope or AC
voltmeters.
Connect a LPF
between Check-
land T1 and T2 to
which connect an
oscilloscope or AC
voltmeters.
Connect an oscillo-
scope as follows.
CH1:RF
(Check-land RF)
CH2:T1
(Check-land TE1)
PLAYER
SETTING
Press the PLAY key .
Confirm that the display is
"05".
Press the PLAY key .
Confirm that the display is
"05".
Press the PLAY key .
Confirm that the display is
"05".
ALIGNMENT
POINT
TE
BALANCE
VR5
FOCUS
GAIN
VR4
TRACKING
GAIN
VR6
FE
BALANCE
VR3
ALIGN FOR
Optimum eye pattern
Symmetry between
upper and lower
Two VTVMs should
read the same
value.
Two VTVMs should
read the same
value.
FIG.
–
–
(d)
(e)
L.P.F
L.P.F
F1
F2
AC voltmeter
VC
1.0kHz
0.05Vrms
L.P.F
L.P.F
T1
T2
AC voltmeter
VC
1.0kHz
0.05Vrms
Note: Test DISC KTD-03, TCD-783 or equivalent
LPF : Around 47k
Ω
+ 390 pF or so.
Step 1~5 are in Test Mode.
(d) Focus Gain
Two VTVMs should read the same
value.
(e) Tracking Gain
Two VTVMs should read the same
value.
DPC-781/782/981(K)
1P(
98.4.24
23:08
y [ W
7
