Samsung RCD-750 - Servicing Notes; General Servicing Precautions

2. Servicing notes
2-1. Before servicing the unit
Be sure to observe the safety notes attached on label,
chassis, cabinet top, cabinet bottom and printed
circuit board.
2-1-1. Caution on laser beammalfunction
Do not try to access objective lens, when DISC is not
on the tray.
When pick-up mechanism replacement is required,
be sure to turn power off.
2-1-2. When handling parts
Tube, tape or insulating parts are used for sepa-ration
or insulation purposes. Especially parts which
generate excessive heat are kept away from PCB or
any other sensitive parts. Therefore, when replacing
parts, be sure to replace them in their original
position.
2-1-3. When fixing wires
Wires should be fixed in such a way with cable-tie so
they won't move.
When finished servicing, be sure to leave unit in it’s
original configuration.
2-1-4. Use specified parts only
The safety specification built into the electronics of
this unit require that you use specified parts only. Do
not use any other replacements. Using other parts
can result in electrical and fire hazard.
2-1-5. After servicing is complete
After servicing is complete, check if there are any
missing parts or that wires are properly fixed and any
place
where
over
heating
or
shock
is
likely
to
occur,
can be found.
short terminal
SOH91Cl(CAR, walkman)
2-1-6. Handling the optical pick-up
*
The
laser
diode
in
the
optical
pick
up
may
suffer
electrostatic
breakdown
because
of
potential
static
electricity
from
clothing
and
your
body.
The following method is recommended.
(1)
Place
a
conductive
sheet
on
the
work
bench
(The
black
sheet
used
for
wrapping
repair
parts.)
(2)
Place
the
set
on
the
conductive
sheet
so
that
the
chassis
is
grounded
to
the
sheet.
(3) Place your hands on the conductive sheet (This
gives them the same ground as the sheet).
(4) Remove the optical pick up block.
(5) Perform work on top of the conductive sheet. Be
careful not to let your clothes or any other static
sources to touch the unit.
* Be sure to put on a wrist strap grounded to the
sheet.
* Be sure to lay a conductive sheet made of copper
etc. which is grounded to the table.
THE UNIT
(1) WRIST-STRAP
FOR GROUNDING
(6) Short the short terminal on the PCB, which is
inside
the
Pick-Up
ASS'Y,
before
replacing
the
Pick-Up.
(The short terminal is shorted when the Pick-Up
Ass'y is being lifted or moved.)
(7) After replacing the Pick-up, open the short
terminal on the PCB.
terminal
SOH94T4N
(CMS-V10,CMS-V30)
terminal
SOH-A1
(CMS-V10,CMS-V30)