Yamaha DVD-S840, Service Manual

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DVD-S840
3
DVD-S840
VARO! : AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NÄKYMÄTTÖMÄLLE LASER-
SÄTEILYLLE. ÄLÄ KATSO SÄTEESEEN.
VARNING! : OSYNLIG LASERSTRÅLNING NÄR DENNA DEL ÄR ÖPPNAD OCH SPÄRREN ÄR URKOPPLAD.
BETRAKTA EJ STRÅLEN.
WARNING
The use of optical instruments with this product will increase eye hazard.
Repair handling should take place as much as possible with a disc loaded inside the player
■
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 electro static damage when servicing or handling the laser diode.
1. Grounding for Electro Static 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.
1M
Conductive material
(sheet) or iron sheet
Anti-static wrist strap
U model
All model
Laser Diode Properties
Type: Semiconductor laser GaAlAs
Wave length: 658 nm (DVD)
790 nm (VCD/CD)
Output Power: CLASS
II
a 1mW (DVD)
CLASS
I
1mW (VCD/CD)