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CDP-M72
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This set employs a laser. Therefore, be sure to follow carefully the
instructions below when servicing.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous
radiation exposure.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective sureface by the objective lens in the optical pick-
up block.
Therefore, when checking the laser diode emission,
observe from more than 30 cm away from the objective lens.
SAFETY-RELATED
COMPONENT
WARNING!!
1.
Laser Diode Properties
* Material: GaAlAs
* Wavelength: 780nm
¢ Emission Duration: continuous
¢ Laser Output: max.44.6.W*
*
This output is the value measured at a distance of about
200mm from the objective lens surface on the Optical Pick-up
Block.
2.
During service, donot take the Optical Pick-up Block apart, and
do not adjust the APC circuit. If there is a breakdown in the APC
circuit (including laser diode), replace the entire Optical Pick-
up Block (including APC board).
LASER DIODE AND FOCUS SERCH OPERATION
CHECK
1. Make POWER switch on with no disc inserted and disc table
closed.
2. Confirm that the following operation is performed while observ-
ing the objective lens.
@ Confirm that laser beam is spread.
e Up and down motion of the objective lens. (3 times)
A pstehi an
vs e a e
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