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DR- UA124X- 2, DR
-
UA124X- 3
DR- UA124X- 5
6. ADJUSTMENTS
22
6.1 Adjustment Methods
If a disc
player is adjusted incorrectly
or
inadequately,
it
may malfunction
or
not
work at all
even though
there
is
nothing
at all
wrong with
the
pickup or the
circuitry.
Adjust correctly
following the adjustment procedure.
e
Adjustment ltemsNerification Items and Order
If the specified values cannot
be
obtained
or
no
adjustment
is possible by
performing the
verifications
or adjustments
described
in steps
I
-
3, the pickup
block
may be
defective.
Step
Item
Test Point
1
Focus offset
verification
FCS.
ERR
2
Tracking error
balance
verification
IRK.ERR
3
RF
level
adjustment (RF
level)
RF
.
Note
:
The
digital
servo
IC
(TC9405F)
being used
in
this
set
has the
following
functions
and
does not provide focus offset, focus
servo
loop gain and
tracking
servo
loop
gain
adjustments.
I. Average function
For accurate servo control, FCS.
ERR and
RF average measurements are
perfonned and the measured values are
compensated
through a
compensation circuit.
Thus, volume
control
for FCS. OFS
adjustment
is not provided.
2.
Auto gain
control
function
The
gain inside the filter
is automatically
adjusted to obtain
a
proper gain
in
the servo
loop.
This
function pennits the optimum gain
to
be obtained
on
each
disc.
Thus,
volume controls for FCS. GAIN and
TRK.
GAIN adjustments
are
not
provided.
The gain
adjustment
is done before TOC reading.
•Measuring Instruments and Tools
I.
Dual trace oscilloscope ( 10:
I
probe)
2.
Test
disc
(YEDS
-
7)
3.
Standard
tools
Adjustment Location
None
None
YR201
•Abbreviation table
FCS.
ERR
IRK.ERR
FCSGAN
TRKGAN
FCS.
IN
IRK.IN
:Focus Error
:Tracking
Error
:Focus Gain
:Tracking Gain
:Focus
In
:Tracking
In
(
(
(
(
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