Kenwood DP-SE7 Service Manual page 6

DP-SE7/SE7(G)/SE9
QQ
3 7 63 1515 0
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
TE
L 13942296513
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
www
.
6
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
T-GAIN TE-B FE-B
x ao u163
y
i
VR3 VR1 VR2
2 9
8
PLAYER
SETTINGS
Press the
PLAY/PAUSE key,
then confirm that the
LED is "03".
Press the
PLAY/PAUSE key,
then confirm that the
LED is "05".
Press the
PLAY/PAUSE key,
then confirm that the
LED is "03".
Press the
PLAY/PAUSE key,
then confirm that the
LED is "05".
Q Q
3 6 7 1 3 1 5
(e) Tracking gainn
CN3
_
1.2 kHz
50 mVrms
+
co
.
9 4 2 8
ALIGNMENT ALIGN
POINTS FOR
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.
FE BIAS
Optimum eye pattern
VR2
Symmetry between
TE BALANCE
upper and lower
VR1
patterns
TRACKING
Two VTVMs should
GAIN
read the same value.
VR3
0 5 8 2 9 9 4 2 8
1
RF
2 FE1
VC
3 FE2
VC
4
+
TE2
L.P.F. VTVM
5
TE1
6
+
L.P.F. VTVM
7
S.S
m
9 9
FIG.
(a)
(e)
9 9