Sanyo MCD-Z1F - Page 7

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CD PLAYER ADJUSTMENTS
.-
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.:.
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Adjustment
Measuring
Short-
Input output
Item
circuit
instrument
connection
connection
location
(a) PLLVCO
Frequency counter SHORT 1
TP 5 (PLL)
—
free-run
TP 4 (GND)
Adjust-
ment
location
--- .
A
Adjustment value
4.300 MHz -5.000 MHz
Waveform symmetry
A =B 1.5 Vp-p
Check be sure that the
“eye” pattern is at the
center of the waveform
and that the diamond
ShaDe is clearlv defined
SVR302
(b) Tracking
Oscilloscope
L.P.F. SHORT 1
TPI:TE
—
balance
TP 2: VC2.5V
(c) Checking
the “eye”
Oscilloscope
TP3:RF
—
pattern
TP 2: VC2.5V
—
d.
ADJUSTMENTS
t
(a
(1)
(2)
(3)
) PLL VCO free-run adjustment
Test disc removed from the unit.
TP5 ~
Short-circuit points 1 on the printed-circuit board.
Connect a frequency counter to TP 5 ( PLL ) and
TP 4 ( GND ).
TP4 ~
Switch ON the DC power ( 12.O,V )
. .
.-
FREQUENCY
COUNTER
(4)
(See component locations diagram at page 5)
Check the reading of the frequency counter
!.
.-
is 4.300 MHz -5.000 MHz. ‘“
.
-,
~:
Cancel the short-circuiting of short-circuit point 1 ~ ‘~“~”-
on the printed-circuit board. -
..’.
... ,”,
.
,1,
~~
L.P. F.
,
(5)
(6)
- ..
( b ) Tracking balance adjustment ‘ TP1 <~~~
+
I
(1)
(2)
(3)
(4)
(5)
(6)
Short-circuit points 1 on the printed-circuit ward..,,. ;. . .“ . .
Connect an oscilloscope to 1P 1 (TE) and TP 2 (VC 2.5V).~Y ;~-:--,y.-, IN
-
‘-’”-- 3 ;
Switch ON the DC power. ‘------- .. ...... .. -—.---..-–.-.--12- . ~p ~.-... -
Set the test disc.
-1
PLAY switch push ON.
OSCILLOSCOPE
Cancel the short-circuiting of short-circuit point 1
on the printed-circuit board.
Adjust SVR302 so that the oscilloscope’s waveform is .
symmetrical, as shown in the illustration.
Switch OFF the DC power.
Ov
1.5vp-p
1
VIDIV
h-g
(7)
(8)
(c
● The adjustments (a) - (b) complete the adjustments of
the CD player.
Next, check the eye pattern waveform.
‘p’
1 OsclLLOscOpE
) Checking the eye pattern
+~
Switch ON the DC power.
Connect an oscilloscope to TP 3 ( RF) and
TP 2 (VC 2.5V ).
Load the test disc.
PLAY switch push ON.
Check to be sure that the “ eye “ pattern is at the center
of waveform and that the diamond shape is clearly defined.
Press the STOP button.
Switch OFF the DC power.
(1)
(2)
I
(3)
(4)
(5)
0
(6)
(7)
H-ttni-ti-n AA/
-6-