To Service Personnel - Yamaha GX-900 Service Manual

GX-900

TO SERVICE PERSONNEL

1. Critical Components Information.
Components having special characteristics are marked and
must be replaced with parts having specifications equal to
those originally installed.
CAUTION : USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE
SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
THE COMPACT DISC PLAYER/MINI DISC RECORDER SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE
EXCEPT PROPERLY QUALIFIED SERVICE PERSONNEL.
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
This set employs a laser. Therefore, be sure to carefully follow the instructions below when servicing .
CD Laser Diode Properties
Material
Wavelength
Emission Duration : Continuous
Laser Output
* This output is the value measured at a distance of
about 200 mm from the objective lens surface on
the Optical Pick-up Block.
When checking the laser diode emission, keep your eyes more than 30 cm away from the objective lens.
w
B, G models
q
B, G models
1
: GaAlAs
: 780 nm
: max. 44.6 µW*
EQUIPMENT
WALL
OUTLET UNDER TEST
INSULATING
TABLE
MD Laser Diode Properties
Material : GaAlAs
Wavelength : 785 nm
Pulse time:
Read mode ... 0.8 mW Continuous
Write mode ... max 10 mW 0.5S
min cycle 1.5S
Repetition
AC LEAKAGE
TESTER OR
EQUIVALENT