Used ICs: PCM1710U – LC78621ED – LC587206A - LA9240 – LA6541D – LB1641 – 5532
CHECKING THE BEAM
EMISSION
The laser
beam of this unit is focused on the reflecting surface of the objective lens in
the optical system block. Therefore, keep your eyes at least 12 inches (30 cm)
away from the objective lens when the laser diode is ON. (Operation Check
Method for Laser Diode and Focus Search Function.)
When the POWER
switch is turned ON after the chucking plate is removed, observe the objective
lens and confirm that the following operations are performed properly. (The
optical system should be at the lead-in area position when it is checked at
this time.)
(1) The laser
should be at the innermost position after the chucking plate is removed.
(2) The
diffused light of the laser beam can be seen when the POWER switch is turned ON.
(3) Vertical
(up and down) movement of the objective lens (2 or 3 times) will take place.
Laser diodes
are extremely susceptible to damage from static electricity. Even if a static
discharge does not ruin the diode, it can shorten its life or cause it to work
improperly. When replacing the pick-up, use a conductive mat, a grounded
soldering iron, and so on, to protect the laser diode from static damage.
