Service manuals, schematics, eproms for electrical technicians

HOWARD RADIO CO. 50 SCH

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
97.6 KB
Page
3
Category
AUDIO
SERVICE MANUAL
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    HOWARD RADIO CO. 50
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HOW I DO ?
kod olvasas
sziasztok--azt szeretnem kerdezni,van-e közületek valaki,aki audi chorus kodját sikerült megfejtenie? ennek motorola 68hc05 vagy 68hc705b32 procija van,es nincs külön memoriája...es van rajta egy vonalkodos cimke es az van meg rá irva radionr:24312--ennek estleg van valami köze a kodjához? es van még egy audi concert rádio,de annak van egy 25c160 tipusu memoriája--ennek a kodjat hogy lehet megfejteni? köszönöm...
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!
Schneider Team 642 CD-SL búgás
Sziasztok ! A fent emlitett hifi a következőt produkálja: a hálozatra csatlakozáskor a hangfalak égtelen hangon búgnak,nem lehet bekapcsolni.Kicseréltem a 2 db tápkondit (3300uf,63v),majd cseréltem egy stk 4182II tipusu végfokot. Úgy nézett ki minden oké,most viszont a trafó 220v felöli biztijét nyomja el ha csatlakoztatom a hálózatra,várom az ötleteket,előre is köszi.
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