Adjustment Command - Sony OA-D32W Service Manual

Function
following procedure, and perform adjustment
again.
(1)
When the waveform is as shown in Fig. 5-4
(b), tum the rotary knob clockwise.
(2) When the waveform is as shown in Fig. 5-4
(c),
tum the rotary knob counterclockwise.
)
3. Set the AID converter gain by adjustment so that
the peak values of the Cat's eye pattern signal may
range from 3 to 4 divisions. (Refer Fig. 5-4 (d) )
NOTE: If
the amplitude ratio is set at any value other
than utmost 1: 1.2 during initializing, control
does not advance the step to the next even if the
IRETURNI
key is pressed.
4. Measure the off track.
5. Calculate the off track.
6. Turning the stepping motor with the geared driver,
set the amplitude ratio of the peak signals on the
Cat's eye pattern signal utmost at I : LOS, fasten
the setscrew and then apply nut lock paint to it.
NOTE:
A ratio of 1 : 1.05
is
dermed by identifying the
smaller one as unity.
NOTE:
Unless the amplitude ratio is utmost 1 : 1.05,
control does not advance the next step.
7. Move the TRK 00 sensor board outside (toward
the stepping motor).
8. Check if the TRK 00 sensor output level is within
the range of broken Jines 3.5 V to 4.5 V.
If not, set the level nearlest to the center between
these broken Jines by adjustment, and fasten the
setscrew with nut lock paint.
(Refer to Fig. 5-4 (e»
NOTE:
When "NO GOOD" is displayed on the
CRT,
repeat step 8. .
Keying
I
RETURN
I
-45-
Adjustment Command
Display
MEASURING
CALCULATING
ADJUST RADIAL
A~IGNMENT
[MAX (L/R, R/L)
<
1.05)
TIGHT FIRMLY
ruT [RETURN) KEY
MOVE 00 SENSOR BOARD TO OUT
SIDE
ruT [RETURN) KEY
L
~
/ "
~
/ -' " L
"' "
'\ I I \ II
(d)
ADJUST
Oo.
SENSOR
HIT [RETURN) KEY
Fig. 5-4
TRACK 3
TRACK 00>01
(Spec: 3.5-4.5)
TRACK 02>01
(Spec: 3.5-4.5)
TRACK 01>00
(Spec: MAX 0.5):
I
4.5 Vf ---- -----
3.5 V-t ---- --
(e)
XXX VOLT
XXX VOLT
XXX VOLT
XXX VOLT
Fig. 5-4 Radial Alignment, TRK 00
Ad·ustment
o'K
OK