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SONY STR-DH520 service manual (1st page)
Preview of SONY STR-DH520 [1st page]
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Relevant forum topics:

SONY CDX-L400X a rádió nem mindig szól
Sziasztok! Ennek a rádiónak a CD része jó, de a rádió nem mindig szól. Olyan mintha némitana, hiába teszem monoba akkor is szaggatottan szól. Nem tudom hogy az okozhatja-e az hogy nem tudom levenni a REG kijelzést, vagy a Tunerja rossz, lehet javítani, vagy újat kellene bele szerezni?
Sony STR-DE485E nem működik az eredeti távirányítóval
Sziasztok! A fenti erősítő az eredeti távval nem működik, csak egy-két funkció. A táv egyébként él, ad jelet. Egy másik, eredeti Sony Audio távval is ugyanez a helyzet, csak pár funkció működik, itt azonban már több: hangerő + és -, muting, kikapcsolás. Tudna valaki tanácsot adni? Köszönettel: Attila
repair sony amplifier str-de254
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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