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INSTRUCTION FOR HANDLING OPTICAL SYSTEM BLOCK
PICKUP
Electrostatic breakdown of the laser diode in the optical system block may occur due to a potential
difference caused by electrostatic charge accumulated on clothing, human body, etc.
A ground must be provided as follows to prevent any electrostatic charge during unpacking or repair
work.
1.
Ground for Human Body
Be sure to wear a grounding band (1M ohm) that is properly grounded to remove any static electricity
that may be charged on the body.
2.
Ground for Work Bench
Be sure to place a conductive sheet (1M ohm) or copper plate with proper grounding on the work
bench or other surface on which the pickup is to be placed.
3.
Because
the static electricity charge
on the clothing
does
not discharge
through
the body
grounding band, do not let clothing contact the pickup unit.
Incorrect
Correct
"
Figure 5
@ Grounding Band
1M ohm
@ Conductive Sheet
or Copper Plate
Note: Laser diodes are so susceptible to damage
from
static
electricity
that
even
if a_
static
discharge does not ruin the diode, it can shorten
Figure 6
its life or cause it to work improperly.
PRECAUTIONS FOR CHECKING BEAM EMISSION OF LASER
DIODE
:
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 (30cm) 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 arm is removed, observe the objective lens
and confirm that the following operations are performed properly.
(The optical system block should be at the lead-in area position when it is checked at this time.)
(1) The disc table should be at the innermost positoin after the chucking arm is removed.
(2) This 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.
i
PICKUP REPLACEMENT
|
FX-10
Caution:
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
pickup, use a conductive mat, a grounded soldering iron, and so on, to protect the laser diode from
static damage.
1.
Remove the CD mechanism assembly by
2.
Remove a washer @) holding the gear.
referring to Disassembly instructions.
(See Figure 8.)
Ground Conductive
3.
Remove two screws (®). (See Figure 8.)
Wrist Band for Body
Less than
102
Conductive
Gum Mat
Figure 7
Figure 8
4.
Take out the pickup
@). Then
pull out
5.
After you
connect
the
wire
connector,
the shaft @. (See Figure 9)
desolder and remove the shorting tab.
(See Figure 10)
Short Round
Figure 9
Short Round
Refer to the drawings of exploded view
of the compact disc mechanism
in page
;
83 for the detailed information.
Figure 10-2
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