Werbung
2V/1mS (DC)
xNo defect
Potential
difference
0V—=|
tWhen
playing
back
the
disc)
Wefect
to disc
(ditto)
Potential
difference
0V——|
(When
playing
back
the
disc)
en
ee
,
WAVEFORMS OF CD CIRCUIT
a
If defect
exists,
pulse-like
noise
as
shown
above
appears,
(Similar
noise
is
found
also
in
TE, FE
signals. )
2) 0,2 V/0. 5mS(DC)
Potential
difference
0V si
(When
playing
back
the
disc)
3) 20mV/2mS
Center
1/2Vcc —-|
(When
playing
back
the
disc)
4] 0. 5V/0. 5uS(AC)
(When
playing
back
the
disc)
In TEST MODE
3
0. 5V/1mS (DC)
Center
1/2Vec
i
In playback
mode
0. 5V/1mS(DC)
Qe
output
and
oe
ox
e e i
SPO
ORRERK YY,
AXKXAXIKARHRRRERR
VY
SYYVVYV YY
VYYS
7
en a
raYeTaatara's
4
WQ-CD220L
Spin motor
PWM
output
(When
playing
back
the disc)
0. 2V/10uS (DC)
Use10:1
probe
to
connect
© somo. sus tac)
(When
playing
back
the
disc)
Use10:1
probe
to
connect
ne
xX
RXRKKX EXTOL
XXX)
(9) 2V/0. 1"S(DC)
(When
playing
back
the
disc)
we
GND
®
1kHz
0dB
(When
playing
back
the
test
disc)
T_T
0.5 V0. SmS(AC)
@ 2veivivc)
[
FOCUS ON in playback
Shon lee
mode
and
test
mode:3.6V
——
In stop
mode:0V——
@
2vaivive)
In playback
mode:4, 8V_|!
If defect
exists
on
the
dise
and
in
track
search
mode
the
pulse—like
"L"
level
appears
as
shown
below.
le
BIN
In stop
mode:0V—
Center
1/2Vcc <table sdeablincalsiicas
If the
disc
rotates
and
the
the
internal
signal
of IC.°
HF
signal
is
tuned
with
H"
level
appears.
In TEST MODE
2
(State where
a disc
is
(The
lens
is
moved
up
and
down. )
Center
1/2Vcc
eld
200mV/0. 5S(DC)
on.
not
placed. )
100
9,
noset|ecralsess fone
bonyoiv oS joly
xThe
storage
oscilloscope
was
used
for
measurement.
(On
the
ordinary
oscilloscope
the
bright
point
appears
as
triangular
wave
as
shown
above. )
-~53-
WQ-CD220L
Figure 54 TAPE MECHANISM EXPLODED VIEW
— 54-
Werbung
