Sharp GX-CD555Z - Page 16

Waveforms of CD circuit
ZVAmSiDCl
*No defect
Potential
difference OV-
(When playing :
back the dlsc)
Potential
difference OV-
(When playlne
back the disc)
If defect exlsts,pulswlike noise as shown above
app‘3firS.
(Similar noise is found also in @
output and
TE.FE signals. I
Potential
difference OV-
(When playins
,$. .,. .I... 1.. .L.. F . ..I.. .I I j / i i
back the disc) / 1 / 1 1 J I I /
(When playing
back the disc)
@ 0. 5V/O. 561AC)
,!. ~ I I i i ! j ! 1 I
(When playing ‘a
back the disc)
0
In TEST MODE 3
0. SV/lmSiDC)
Center 1/2Vcc _
,888 it,,,,
0
In TEST MODE 2
(State where a disc is not oiaced. I
Center 1/2Vcc -m
2OOmV/O. 5SiDCl
@ Spin motor PWM output
(When playing back the disc)
0. 2V/lOrrSiDCl
UselO:l probe to connect
:!I/ i
I I I i ;
/~,/Ii,/,
GND,,“ilri /j/
‘,I ii
I ~
PWM2 71 H i?T IfI +
,?... j
I 1 1 I i
..’ ..I. / . ..I /..
1
GND
“; ! I 1 ! i j ! j i j
0
5OmV/O. 5/1SlACl
(When playing back the disc1
UselO: probe to connect
lfiS(DCl
playin
back the di
SC)
GND-
IV/O.
OdB
PlaYins
5mS (AC)
back the test disc1
CD
P.
1. I ”
01
I. ., 1 ;. 1
&h A 0, I ,/DFv , I !
i ,
*The storage oscilloscope was used for
measurement. IOn the ordinary osc~lloscape
the bright point appears as triangular
wave as shown above. 1
- 16-
2VdivlDC1
If defect exists on the disc and in
track search mode the pulse-like
‘L” level appears as shown below.
In p I ayback mode:4. SV-:
In stop mode:OV-
If the disc rotates and the HF si8nal is tuned with
the internal signal of IC.‘H” level appears.