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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
1c501 (15), (6)
i
f
ais
switch (S901) ..... EUROPE/AUSTRALIA/ITALY
MEMORY
ry
When the PLAY or MEMORY key is pressed without
i
loading
a disc, the
pickup
emits laser beam, but sever-
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.
POWER
ON/OFF
ov
-5.2V
ee
eee
52V ----
lou
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