Advertisement
CFD-D73
FocusÆracking Grin Adiustment
A frequency response analyzet is necessary in
order to perforrn this adjustment exactly.
However, this gain has a margin, so even if it is
slightly off, there is no problem. Therefore. do not
perform this adjustment.
Focus/tracking gain determines the pick-up follow-
up (vertical and horizontal) relative to mcchanical
noise and mechanical shock when the 2-axis device
operat e,
However, as these reciprocate, the adjustment is at
the point where both arc satisfied.
.
lvhen gain is raised, the noise.when the 2-axis
devic€ operates increascs.
a When gain is lowered, it is more susceptible to
mechanical shock and skipping occurs more easily.
.
When gain adjustment is off, the symptoms below
zPpeal .
The following is a simple adjustment method.
- S i m p l e A d j u s t m e n t -
Not.: Since exact adjustment cannot be performed, remem-
ber the positions of the conrrols before peiforming the
a justment. If the positions after the simple adju3t-
ment are ody a little different, return the controls lo
the oridnal position.
oscilloæope
(DC rangte)
CD main board
VBEF
Keep the set horizontal.
/If
the set is not horizontal, this adjustmentl
I
cannot be performed due to the gravity against
I
\ the 2 axis device.
I
Insert disc (YEDS-I 8) and press ) pLAy button.,
Connect.oscilloscope
to main amp board FE.
Adjustment RV705 so that the waveform is as
shown in the figure below. (focus gain adjustment)
o
l .
)
J .
4.
voLT/Dtv:
TIME/DIV:
l @ m V
0 v
Incorrent Examples (DC
on adjusted waveform)
level changes more than
high focus gain
VOLT/DIV:
TIT'E/DIV:
25O mV
VOLT/DIV:
TIME/DIV:
lO0 mV
75 mV
O V
Grin
Symplomr
Foq lt
Tr.ckirrg
. Thc time until music starts
becomcs longcr for STOP
rf)
PLAY or automatic
selecrion (1a.1 )}lbuttons
Prcsscd. (Normâlly takca
about 2 scconds.)
low
low or high
. Music doe3 not start and
dilc conlinuca to rotatc
for STOPr)) PLAY or
automâtic selection ( |<<
})l buttons pressed.)
low
. Sound is intcrrupted dur-
int PLAY. Or timc count-
er displey 3tops progrest-
int.
low
. More poisc during 2-exir
dcvicc opcration.
hith
high
low focus gein
- 1 6-
Advertisement
