Table of Contents
Advertisement
CDP-502ES /620ES
NOTE
ON
REPAIR
The clock signals from pin
3
are wave shaped at
1C351 and applied to 1C603 pin (1). Here they
are further
divided
into
two
and
8.4672 MHz
clocks
are applied
to IC601.
The other micro-
computers
use
the
4.2336 MHz
signal
(divided
at [C603 and output from pin
).
e@ Are the optical block and servo operating?
If power is turned on when a disc is not inserted,
the laser goes up and down three times.
Correct
optical block and servo system operation can be
checked by confirming by eye that the laser is lit
up at this time.
_ fore, when checking the laser diode emission, observe,
from more than 30 cm away from the objective lens.
2} Confirm that laser beam is spread,
(3) Up and down motion of the
objective lens, (3 times)
optical pick-up
block
© Hold down optical
pick-up by a finger.
Advertisement
Table of Contents
