Sanyo CP10 - Laser Control Circuit; Operation and Safety Features

DESCRIPTION OF LESER BEAM CONTROL CIRCUIT
(1) Laser operation circuit
(2) Operation of the circuit
a_ By turning “ON” the POWER switch (S601) after the
power cord is plugged in or the battery pack is con-
nected to the unit, then closing the top lid, the
CLOSE switch (S609) [ and LASER switch ($901) hoa a
eet EUROPE/AUSTRALIA/ITALY only } will go
EUROPE
“ON”, and pin 35 of 1C501 (OPEN/CLOSE) becomes ae aay pecpOweR
“LOW” level. Fu eae only
b Press the PLAY key (S604) or the MEMORY key 5901
| | CIRCUIT
ney
(S605). While the key is pressed, pin 15 (PLAY/ ana diy
PAUSE)
or
pin
16
(MEMORY)
of
IC501
becomes
:
i
ON/OFF
“LOW”,
c Pin 19 (HOLD) of 1C501 becomes “HIGH”, and the
hold condition of 1C501 will be cancelled.
d Consequently, pin 28 (P-CONTL) of 1C501 becomes
"LOW", and “HIGH” voltage will be applied to the
POWER ON/OFF terminal of the +5.2V DC POWER
BLOCK via 0502.
e -—5,2V output from DC POWER BLOCK is applied
to the APC circuit of the pickup, and causing the
pickup emits the laser beam.
Safety Operation
1c801
@
a
When
the
top
lid
of
the
unit
is
open
with
the
POWER
SPEN
IETOEE
a
|e
switch
is
“ON”,
even
if
you
press
the
PLAY
key
or
MEMORY
key,
the
pickup
will
not
emit
laser beam
because
the CLOSE switch (S609)
[
and
LASER
1c501 (15), (6) i f ais switch (S901) ..... EUROPE/AUSTRALIA/ITALY
PLAY
/
PA
PLAY
/
PAUSE.
only
]
is
“OFF”
and
pin
35
of
IC501
remains
“HIGH”.
MEMORY ry When the PLAY or MEMORY key is pressed without
i loading a disc, the pickup emits laser beam, but sever-
1c501
| |
al
ener
later
it
will
ep
to
emit
laser
beam
as
safety
HOLD
===>
circuit
defects
that
there
is
no
disc.
c Even in the event that 1C501 breaks down and the
10501 @8) pickup emits laser beam, it will not directly enter the
P-CONTL eye because of the opaque cover.
+5,2V
DC
POWER
ee
ae
POWER ON/OFF
ov
-5.2V ee eee
52V ----
lou