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SONY STR-DH520
AUDIO - SERVICE MANUAL
Type: (PDF)
Size
4.2 MB
Page
72
Category
AUDIO
SERVICE MANUAL
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Whether you suffer fatal electrical shock! Instead, contact the nearest service center!


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SONY STR-DH520 service manual (1st page)
Preview of SONY STR-DH520 [1st page]
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Want to share: Have downloaded the schematics from this forum to help repair the amplifier of a friend. Turned out that Sony decided to route the earth through the chassis, even the earth between the various supplies. When one takes the main board out of the chassis and switches the amp on, there are up to 20 volts difference between the eart (and hence reference) of the pre-amps and the main amps. Luckily the amp goes into protection but from a design point of view it is not nice to rely on screws and aluminum face plates to conduct up to 0.2 amps of current from one supply to another. What I did is solder wires to every eart point and connected them on the main board to make it stand alone and not rely on conducting current through the chassis anymore. Bad design, simple repair but took some digging in the schematics to find out what exactly was going on!
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