DP-SG7/SG7G
4
ADJUSTMENT
FIG.
VC
CN3
L.P.F.
+
+
L.P.F.
VTVM
VTVM
1
2
3
4
5
6
7
1.2 kHz
50 mVrms
RF
FE1
FE2
VC
TE2
TE1
S.S
+
_
(a)
No.
ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
ALIGNMENT
POINTS
ALIGN
FOR
PLAYER
SETTINGS
1
LASER POWER
−
Apply the sensor section
of optical power meter
on the pickup lens.
−
On the power from
0.08 to 0.15 mW,
when the diffraction
grating is correctly
aligned with the RF
level of 0.6 Vp-p or
more.
Press the
PLAY/PAUSE key,
then confirm that the
LED is "03".
ALIGNMENT POINTS
Pickup
3
FOCUS ERROR
BIAS
Test disc
Type 4
Connect an oscilloscope
as follows.
CH1 : RF (CN3 pin 1)
CH2 : TE (CN3 pin 6)
FE BIAS
VR2
Optimum eye pattern
Press the
PLAY/PAUSE key,
then confirm that the
LED is "05".
Note:
Type 4 disc : SONY YEDS-18 Test Disc or equivalent.(KTD-0
✽
)
LPF: Around 47 k
Ω
+ 390 pF or so.
Step 1~4 are in Test Mode.
0.08
0.15 mW
Optical power meter
2
TRACKING ERROR
BALANCE
Test disc
Type 4
Connect an oscilloscope
as follows.
CH1 : RF (CN3 pin 1)
CH2 : TE (CN3 pin 6)
TE BALANCE
VR1
Symmetry between
upper and lower pat-
terns
Press the
PLAY/PAUSE key,
then confirm that the
LED is "03".
(e)
4
TRACKING GAIN
Test disc
Type 4
Apply signal of
1.2 kHz,
50mVrms to
CN3 pin 5-6.
Connect a LPF to CN3
pin 5-6 to which you
connect an oscilloscope
or AC voltmeters.
TRACKING
GAIN
VR3
Two VTVMs should
read the same value.
Press the
PLAY/PAUSE key,
then confirm that the
LED is "05".
While pressing the "REPEAT" key, turn the AC ON.
{ Refer to test mode (MODE 0 0) }
(e) Tracking gain
(a) Laser power
T-GAIN
VR3
VR1
VR2
CN1
TE-B
FE-B
