Prevention Of Electro Static Discharge; Grounding For Electrostatic Damage Prevention; Locale Management Information; Handling Precautions For The Traverse Unit - Yamaha DVD-S520 Service Manual

DVD-S520/DV-S5450

PREVENTION OF ELECTRO STATIC DISCHARGE

The laser diode in the traverse unit (optical pickup) may be damaged due to static electricity from clothes or the human body.
Use caution to prevent electrostatic damage when servicing or handling the laser diode.

1. Grounding for electrostatic damage prevention

Some devices, such as the DVD player, use an optical pickup (laser diode) that will be damaged by static electricity in the
working environment. Only attempt service after ensuring that all grounding procedures have been completed.
1. Worktable grounding
Put a grounded conductive material (sheet) or iron sheet on the area where the optical pickup is placed.
2. Human body grounding
Use an anti-static wrist strap to discharge the static electricity from your body.
Anti-static wrist strip
2. Handling of the optical pickup
1. To prevent damage to the optical pickup replacement parts during transportation and before installation, both ends of the
laser diode are short-circuited. After installing the new part, remove the short circuit according to the correct procedure in
this service manual.
2. Do not use a tester to check the laser diode in the optical pickup. The power supply in the tester will damage the laser
diode.
3. Handling Precautions for the Traverse Unit (Optical Pickup)
1. Handle the traverse unit (optical pickup) gently, as it is an extremely high-precision assembly.
2. When replacing the optical pickup, install the flexible cable and cut its short land with wire cutters. See the optical pickup
replacement procedure in this service manual. Before replacing the traverse unit, remove the shorting pin for preventing
static electricity damage and install the new unit. Reconnect the connector as quickly as possible.
3. The flexible cable lines may break if an excessive force is applied to it. Use caution when handling the cable.
4. The semi-fixed resistor for laser power adjustment should not be adjusted. Do not turn the resistor.

LOCALE MANAGEMENT INFORMATION

Locale Management Information : This DVD player is designed and manufactured to respond to the Locale Management
Information that is recorded on the DVD disc. If the Locale number described on the DVD disc does not correspond to the
Locale number of this DVD player, this DVD player cannot play this disc.
This product incorporates copyright protection
technology that is protected by method claims of
certain U.S. patents and other intellectual
p r o p e r t y r i g h t s o w n e d b y M a c r o v i s i o n
Corporation and other rights owners. Use of this
copyright protection technology must be
authorized by Macrovision Corporation, and is
intended for home and other limited viewing uses
only unless otherwise authorized by Macrovision
C o r p o r a t i o n . R e v e r s e e n g i n e e r i n g o r
disassembly is prohibited.
3
1M
1
4
Conductive material
(sheet) or steel sheet
5
2
6
3
5
5
2
2
4