Sony CDP-507ESD - Page 8

Ge ee ce
1D/507ESD
CDP-227ESD/507ESD
Focus/Tracking Gain Adjustment
A frequency response analyzer is necessary in
order to perform 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 mechanical
noise and mechanical shock when the 2-axis device
operate.
However, as these reciprocate, the adjustment is at
the point where both are satisfied.
@ When gain is raised, the noise when the 2-axis
device operates increases.
@ When gain is lowered, it is more susceptible to
mechanical shock and skipping occurs more easily.
@ When gain adjustment is off, the symptoms below
appear.
e The time until music starts
becomes longer for STOP
> DPLAY or automatic
selection (Ké4, >P>t buttons
pressed. (Normally takes
about 2 seconds.)
low or high
@ Music does not start and
disc continues to rotate
for STOP>PPLAY or
automatic selection (K¢@
bP buttons pressed.)
Jt
e Disc table opens shortly
after STOP>DPPLAY.
low or high
e Sound is interrupted dur-
ing PLAY. Or time count-
er display stops progress-
* ing.
e More poise during 2-axis
device operation.
The following is a simple adjustment method.
— Simple Adjustment —
Note: Since exact adjustment cannot be performed, remem-
ber the positions of the controls before performing the
adjustment. If the positions after the simple adjust-
ment are only a little different, return the controls to
the original position.
oscilloscope
Procedure: ae a
main board &
—_—_—
TP TEO cor ae 1 +
|
TP FEOQ- -7
1. Keep the set horizontal.
If the set is not horizontal, this adjustment
(cannot be performed due to the gravity saint)
the 2 axis device.
. Put set in adjustment mode.
. Insert disc (YEDS-1) and press » PLAY button.
. Connect oscilloscope servo board TP FEO.
mi WwW bh . Adjustment RV203 so that the waveform is as
shown in the figure below. (focus gain adjustment)
TIME/DIV: 2mS
—100mvV
—oOov
@ Incorrent Examples (DC level changes more than
on adjusted waveform)
low focus gain
—OVv
high
focus
gain
VOLT/DIV:
100
TIME/OIV: 2mS
VOLT/DIV: 100mVv
VOLT/DIV: 100mV
TIME/OIV: 2mS
6. Connect oscilloscope to main board TP TEO.
7. Adjust RV304 so that the waveform is as shown in
the figure below. (tracking gain adjustment)
VOLT/DIV: TV
TIME/DIV: 2mS
~——OV
@ Incorrect Examples (fundamental wave appears)
low tracking gain
VOLT/DIV: 1V
TIME/DIV: 2mS
—ov
high tracking gain
(higher fundamental wave than for low gain)
VOLT/DIV: 1Vv
TIME/OIV: 2mS
—oOov
Adjustment Location: main board
Adjustment Location: main board
[MAIN BOARD]
CDP-227ESD/507ESD
—mounted side —
IRFCI® STe03
(RF}
e
(ADJ)
lasyYie @Rv201 RF PLL
1C204
@(TES)
RV102 TRACKING GAIN
(GNDJ@
[®RV103 FOCUS GAIN
(TEO)@
(FEO) @ @RV104 FOCUS BiAS
1C204
RV101 EF BALANCE