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SAFETY INFORMATION
This service manual is intended for qualified service technicians; it is not meant for the casual
do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been
trainedto properly and safely repair complex products such as those covered by this manual.
Improperly performed repairs can adversely affect the safety and reliability of the product and
may void the warranty. If you are not qualified to perform the repair of this product properly and
safely, you should not risk trying to do so and refer the repair to a qualified service technician.
WARNING !
THE AEL (ACCESSIBLE EMISSION LEVEL) OF THE LASER POWER OUTPUT IS LESS THAN CLASS 1
BUT THE LASER COMPONENT IS CAPABLE OF EMITTING RADIATION EXCEEDING THE LIMIT FOR
CLASS 1.
A SPECIALLY INSTRUCTED PERSON SHOULD DO SERVICING OPERATION OF THE APPARATUS.
LASER DIODE CHARACTERISTICS
FOR DVD : MAXIMUM OUTPUT POWER : 5 mW
WAVELENGTH : 650 nm
FOR CD :
MAXIMUM OUTPUT POWER : 5 mW
WAVELENGTH : 780 nm
Additional Laser Caution
∗
: See page 70.
LABEL CHECK
1. Loading-status detection switch (S101 on the LOAB assy) are detected
by the microprocessor (IC601 in the DVDM assy).
• To permit the laser diode to oscillate, it is required to set the loading-
status detection switch for the clamp position (the center terminal of
S101 is shorted to +3V).
When the voltage of IC101-pin 20 is +3V, IC601 (microprocessor)
-pin 83 is +3V and IC601-pin 84 is +3V, 650nm laser diode for DVD
oscillates in the DVDM Assy.
When the voltage of IC101-pin 20 is +3V, IC601 (microprocessor)
-pin 83 is 0V (GND) and IC601-pin 84 is +3V, 780nm laser diode for
CD oscillates in the DVDM Assy.
In the test mode * , the laser diode oscillates when microprocessor
detects a PLAY signal, or when the PLAY key is pressed (S104 ON in
the FLKY assy), with the above requirements satisfied.
2. When the cover is open, close viewing through the objective lens with
the naked eye will cause exposure to the laser beam.
Location: Printed on the Rear Panel
Содержание DV-757AI
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Страница 42: ...DV 757Ai 42 1 2 3 4 1 2 3 4 C D F A B E 3 12 ILKB ASSY I ILKB ASSY VWG2391 I D D D D D D D D D ...
Страница 109: ...DV 757Ai 109 5 6 7 8 5 6 7 8 C D F A B E 7 M65776AFP DVDM ASSY IC751 MPEG2 Decorder IC Block Diagram ...
Страница 113: ...DV 757Ai 113 5 6 7 8 5 6 7 8 C D F A B E 7 PCM1738EG 3 JACB ASSY IC301 D A Converter IC Pin Arrangement Pin Function ...
Страница 115: ...DV 757Ai 115 5 6 7 8 5 6 7 8 C D F A B E 7 LA73054 JACB ASSY IC701 DVD Video Amplifier Block Diagram ...
Страница 117: ...DV 757Ai 117 5 6 7 8 5 6 7 8 C D F A B E 7 CXD2753R SACDB ASSY IC901 SACD Decorder Pin Arrangement ...
Страница 130: ...DV 757Ai 130 1 2 3 4 1 2 3 4 C D F A B E 7 ADV7300AKST DVDM ASSY IC831 Video Encoder IC Pin Arrangement ...
Страница 131: ...DV 757Ai 131 5 6 7 8 5 6 7 8 C D F A B E Pin Function ...
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Страница 133: ...DV 757Ai 133 5 6 7 8 5 6 7 8 C D F A B E 7 PM0033A DVDM ASSY IC902 Progressive Scan Converter PRO2 Pin Arrangement ...
Страница 152: ...DV 757Ai 152 1 2 3 4 1 2 3 4 C D F A B E 7 3 DISC CONTENT FORMAT PLAYBACK COMPATIBILITY ...
Страница 154: ...DV 757Ai 154 1 2 3 4 1 2 3 4 C D F A B E 8 PANEL FACILITIES ...
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