Samsung Electronics
1-4
1-4 Special Precautions and Warning Labels for Laser Products (Continued)
1-4-1 Warnings
1. When servicing, do not approach the
LASER exit with the eye too closely. In
case it is
necessary to confirm LASER beam emis-
sion, be sure to observe from a distance of
more than 30 cm from the surface of the
objective lens on the optical pick-up block.
2. Do not attempt to handle the objective lens
when the DISC is not on the tray.
1-4-2 Laser Diode Specifications
Material: GaAs+ GaAlAs
Wavelength: 760-800 nm
Emission Duration: Continuous
Laser Output: 0.2 mw (measured at a
1.6 mm distance from the objective lens
surface on the optical pick-up block.)
1-4-3 Handling the Optical Pick-up
1. Static electricity from clothing or the body
may cause electrostatic breakdown of the
laser diode in the Optical Pickup. Follow
this procedure:
2. Place a conductive sheet on the work bench
(i.e., the black sheet used for wrapping
repair parts.) Note: The surface of the work
bench should be covered by a copper
ground plane, which is grounded.
3. The repair technician must wear a wrist
strap which is grounded to the copper
sheet.
4. To remove the Optical Pickup block:
Place the set on the conductive sheet, and
momentarily touch the conductive sheet
with both hands. (While working, do not
allow any electrostatic sources--such as
clothes--to touch the unit.)
5. Ground the "Short Terminal" (located on the
PCB, inside the Pickup Assembly) before
replacing the Pickup. This terminal should
be shorted whenever the Pickup Assembly
is lifted or moved.
6. After replacing the Pickup, reopen the Short
See diagrams below:
Precautions
THE UNIT
(1) WRIST-STRAP
FOR GROUNDING
1M
1M
CONDUCTIVE SHEET
short
terminal
short terminal
short
terminal
short
terminal
SOH91VI(LDP)
SOH91CI(CAR,walkman)
SOH94T4N
(CMS-V10,CMS-V30)
SOH-A1
(CMS-V10,CMS-V30)
1-5 Special Precautions for HDD
* HDD Data Maintenance Step
1. Since the data on the HDD is weak to mechanical shock, place the HDD in a safe
location that is free from mechanical shock once it is removed from the main unit.
2. In order to safe keep the data on the HDD, back up the data before the repair or
make sure not to place the HDD near any electrical appliance that generates a
strong magnetic field.
Summary of Contents for YP-U1
Page 17: ...Samsung Electronics 4 1 Samsung Electronics 4 Adjustments 1 How to recover the device ...
Page 18: ...4 2 Samsung Electronics ...
Page 19: ...4 3 Samsung Electronics 2 How to upgrade Firmware ...
Page 24: ...Samsung Electronics 6 1 6 Troubleshooting 1 Power failure ...
Page 25: ...6 2 Samsung Electronics 2 No audio sounds ...
Page 26: ...Samsung Electronics 6 3 3 Cannot make a voice recording ...
Page 27: ...6 4 Samsung Electronics 4 Buttons do not work ...
Page 28: ...Samsung Electronics 6 5 5 Connection with the pc is abnormal ...
Page 34: ...Samsung Electronics 9 1 9 Block Diagram ...
Page 35: ...Samsung Electronics 10 1 10 Wiring Diagram ...
Page 37: ...11 2 Samsung Electronics This Document can be used without Samsung s authorization 2 BUTTOM ...
Page 39: ...12 2 Samsung Electronics This Document can be used without Samsung s authorization 2 SUB ...
Page 40: ...Samsung Electronics 12 3 3 SELF TEST Manual ...
Page 42: ...13 2 Samsung Electronics ...
Page 43: ...13 3 Samsung Electronics 1 2 Main Functions by Block ...
Page 45: ...14 2 Samsung Electronics Yepp Block Diagram ...
Page 53: ...14 10 Samsung Electronics Small Form factor Cards Comparison ...
