Sony D-5 - Page 31

\CKING GAIN ADJUSTMENT
ng gain determines the pick-up follow-
and horizontal) relative to mechanical
echanical shock when the 2-axis device
these reciprocate, the adjustment is at
ere both are satisfied.
1 is high, the noise when the 2-axis device
ncreases,
1 is low, it is more susceptible to mecha-
k and skipping occurs more easily.
ent is to be performed when replacing
, parts:
(focus gain VR), RV502 (tracking gain
Method:
1 Adjustment —
ent is not performed.
gain VR RVSO1 is turned, set to me-
er (see Fig. 6).
} = MAX (high gain)
/
‘
: VR contact point
| When VR contact point is
here, it is at mechanical center.
p
view)
(side
view)
D-5/D-50 D-5/D-50
Turn the power switch on, insert the disc
(YEDS-1) and press the > Ml key.
Turn RV502 slightly clockwise (tracking gain
drops) and obtain a waveform with a funda-
mental wave (waveform has large waves) as in
Figure 7.
Turn RV502 slowly counterclockwise (tracking
gain rises) until the fundamental wave disap-
pears (no large waves) as in Figure 8.
Set RV502 to the position about 30° counter-
clockwise from the position obtained in step 5.
If RV502 contact point location is within the
range shown in Figure 6 @ , tracking gain is
too high. In this case, readjust from step 4.
Select AMS mode with the MODE button,
continuously press ppl or k¢q key and observe
the 100 track jump waveform. Check that no
traverse waveform appears for both pp| and
Kéq directions. (See Figures 9 and 10.) It is
acceptable if the traverse waveform appears
only now and then, but if it appears constantly,
raise tracking gain slightly and check step 7
again.
Check that there is not an abnormal amount
of operation noise (white noise) from the 2-axis
device. If there is, tracking gain is too high, so
readjust starting with step 4.
@ Waveform when fundamental wave disappears (no
large waves).
@ Waveform with no traverse waveform during 100
Fig. 8
track jump. (Brake application is smooth because
of adjustment).
100 track jump waveform
TP9 (TE)
Adjustment Location: main board
The waveforms are those measured with the oscil-
loscope set as shown below. Fig. 9
VOLT/DIV: 1V
TIME/DIV: 5mV
nical Center (seen from chip mounted side)
RV502 TP9 (TE)
(tracking gain)
@ Waveform with traverse waveform during 100 RV5OF
: Ar E (focus gain)
track jump. (Brake application is poor because
of low tracking gain.)
ain Adjustment —
t normal operation) @ Waveform when tracking gain is lowered.
Fundamental wave appears (large waves).
(DC range)
Seen Pes NAAM Aw AAA N Aw arr | ‘he mr TPP ad
Li iyvvy y i Aa
e set level, horizontally (upper panel
acing down). (If the set is not level, the
vice will be weighted and adjustment
e done.)
Fig. 7 100 track jump traverse waveform
waveform
the oscilloscope to main board test Fig. 10
9 (TE).
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