Adjustment - Kenwood DP-4090 Service Manual

No. ITEM
Step 1~4 are in TEST MODE
1 LASER POWER
TRACKING ERROR
2
BALANCE
FOCUS ERROR
3
BALANCE
4 TRACKING GAIN
Note:
Type 4 disc : SONY YEDS-18 Test Disc or equivalent.
LPF: Around 47 kΩ+ 390 pF or so.
(a) Laser power
Pickup

ADJUSTMENT

INPUT OUTPUT
SETTINGS SETTINGS
Apply the sensor section
−
of optical power meter
on the pickup lens.
Connect an oscilloscope
Test disc as follows.
Type 4 CH1 : RF (CN2 pin 1)
CH2 : TE (CN2 pin 6)
Connect an oscilloscope
Test disc as follows.
Type 4 CH1 : RF (CN2 pin 1)
CH2 : FE (CN2 pin 2)
Test disc
Connect a LPF to CN2
Type 4
Apply signal of pin 5-6 to which you
1.2 kHz, connect an oscilloscope
50mVrms to or AC voltmeters.
CN2 pin 5-6.
0.08~0.15 mW
Optical power meter
DP-4090/5090/D-S300
PLAYER ALIGNMENT
SETTINGS POINTS
While pressing the
UP key, turn the AC
ON. (Test mode)
Press the
PLAY/PAUSE key,
then confirm that the
display is "03".
Press the
PLAY/PAUSE key, TE BALANCE
then confirm that the VR2
display is "03".
Press the
PLAY/PAUSE key, FE BALANCE
then confirm that the VR1
display is "05".
Press the
TRACKING
PLAY/PAUSE key,
GAIN
then confirm that the
VR3
display is "05".
(e) Tracking gain
CN2
1
2
3
_
4
1.2 kHz 5
50 mVrms
6
+
7
ALIGN
FOR
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.
Symmetry between
upper and lower pat-
terns
Optimum eye pattern
Two VTVMs should
read the same value.
GND
+
L.P.F. VTVM
+
L.P.F. VTVM
FIG.
(a)
(e)
9