To Service Personnel - Yamaha MD4S Service Manual

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TO SERVICE PERSONNEL

Leakage Current Measurement (For 120 V Models
Only).
When service has been completed, it is imperative to
verify that all exposed conductive surfaces are
properly insulated from supply circuits.
• Meter impedance should be equivalent to 1500 ohm
shunted by 0.15µF.
• Leakage current must not exceed 0.5 mA.
• Be sure to test for leakage with the AC plug in both
polarities.
CAUTION: USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER
THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
THIS PRODUCT SHOULD NOT BE ADJUSTED OR REPAIRED BY ANYONE EXCEPT PROPERLY QUALIFIED SERVICE PERSONNEL.
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L 13942296513
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
This set employs a laser. Therefore, be sure to carefully follow the instructions below when servicing.
1. Laser Diode Properties
•Materlal :
•Wavelength :
•Emission Duration :
•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.
2. When checking the laser diode emission, keep your eyes more than 30 cm away from the objective lens.
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Continuous
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WALL
OUTLET
• POLARIZATION (U, C models)
This product is equipped with a polarized alternating-
current line plug (a plug having one blade wider than
the other). This plug will fit into the power outlet only
one way. This is a safety feature.
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AC LEAKAGE
EQUIPMENT
TESTER OR
UNDER TEST
EQUIVALENT
INSULATING
TABLE
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MD4S
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