Adjustment - Kenwood DP-SG7 Service Manual

DP-SG7/SG7G
No. ITEM
While pressing the "REPEAT" key, turn the AC ON.
{ Refer to test mode (MODE 0 0) }
1 LASER POWER
FOCUS ERROR
2
BIAS
TRACKING ERROR
3
BALANCE
4 TRACKING GAIN
Note:
Type 4 disc : SONY YEDS-18 Test Disc or equivalent.(KTD-0 )
LPF: Around 47 kΩ+ 390 pF or so.
Step 1~4 are in Test Mode.
(a) Laser power
Pickup
ALIGNMENT POINTS
T-GAIN
VR3
4

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 (CN3 pin 1)
CH2 : TE (CN3 pin 6)
Connect an oscilloscope
Test disc as follows.
Type 4 CH1 : RF (CN3 pin 1)
CH2 : TE (CN3 pin 6)
Test disc
Type 4 Connect a LPF to CN3
Apply signal of pin 5-6 to which you
1.2 kHz, connect an oscilloscope
50mVrms to or AC voltmeters.
CN3 pin 5-6.
0.08 0.15 mW
Optical power meter
CN1
TE-B FE-B
VR1 VR2
PLAYER ALIGNMENT
SETTINGS POINTS
Press the
PLAY/PAUSE key,
−
then confirm that the
LED is "03".
Press the
PLAY/PAUSE key, FE BIAS
then confirm that the VR2
LED is "05".
Press the
PLAY/PAUSE key, TE BALANCE
then confirm that the VR1
LED is "03".
Press the
TRACKING
PLAY/PAUSE key,
GAIN
then confirm that the
VR3
LED is "05".
(e) Tracking gain
CN3
1 RF
2
FE1
3 FE2
VC
_
4
TE2
1.2 kHz 5
50 mVrms
TE1
6
+
7 S.S
ALIGN
FIG.
FOR
On the power from
0.08 to 0.15 mW,
when the diffraction
grating is correctly (a)
aligned with the RF
level of 0.6 Vp-p or
more.
Optimum eye pattern
Symmetry between
upper and lower pat-
terns
Two VTVMs should
(e)
read the same value.
VC
+
L.P.F. VTVM
+
L.P.F. VTVM