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Yamaha MDX-E300 Service Manual page 3

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WARNING: Laser Safety
This product contains a laser beam component. This component may emit invisible, as well as visible radiation,
which may cause eye damage. To protect your eyes and skin from laser radiation, the following precautions must
be used during servicing of the unit.
1) When testing and/or repairing any component within the product, keep your eyes and skin more than 30 cm away from
the laser pick-up unit at all times. Do not stare at the laser beam at any time.
2) Do not attempt to readjust, disassemble or repair the laser pick-up, unless noted elsewhere in this manual.
3) CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in
hazardous radiation exposure.
Laser Emitting conditions:
1) When the Top Cover of the MD recorder unit is removed, and the "STANDBY/ON" SW is turned to the "ON" position,
the laser component will emit a beam for several seconds to detect if a disc is present. During this time (5-10 sec.) the
laser may radiate through the lens of the laser pick-up unit. Do not attempt any servicing during this period!
If no disc is detected, the laser will stop emitting the beam. When a disc is set, you will not be exposed to any laser
emissions.
2) The laser power level can be adjusted with the VR on the pick-up PWB. However, this level has been set by the factory
prior to shipping from the factory. Do not adjust this laser level control unless instruction is provided elsewhere in this
manual. Adjustment of this control can increase the laser emission level from the device.
Laser Diode Properties
Material :
GaAlAs
Wavelength :
785 nm
Emission duration :
Continuous
Pulse Durations and Max. Output at the lens of the Laser Pick Up Unit ;
Read mode :
0.6 mW (Continuous)
Write mode :
Max 10 mW for 0.5s, Min. Cycle 1.5s
ANSI Class :
Class 1
* This output is the value measured at a distance of about 200 mm from
the objective lens surface on the Optical Pick-up Block.
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.
R, G, B models
R, G, B models
MDX-E300
Magnetic head
Optical pick-up
3

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