Service manuals, schematics, eproms for electrical technicians

MAGNAVOX SKYMASTER-903A 1949 SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
If you get stuck in repairing a defective appliance download this repair information for help. See below.
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  • Also known:
    MAGNAVOX 1949 SKYMASTER 903 903A
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
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!
Software Simulator for Nakamichi T-100 Audio Analyzer
Sziasztok!

Ajanlottàk egy külhoni forumon_nem neztem utana, hogy penzes-e...
https://www.youtube.com/watch?v=5s7Kmr4HGuw
A megoldas asszem bukhat a hangkartya minösegen, meg Win10 -en fut.

üdv, Kari
LG LX-E330 deck autostop/reverse probléma (megoldhatatlanul megoldva)
Kijelző gond miatt ugye szét volt bontva a cucc, és a kijelző alatt kicserélgettem elkokat. Na utána elkezdett a kazettás deck része olyan hibát produkálni, hogy ha elindítom, pár másodperc után vagy megáll vagy fordul és elkezdi a másik oldalt játszani 6x és leáll (play mode beállítástól függően), tehát mintha vége lenne a szalagnak működésbe lép az autostop/auto reverse, csévéléskor is leáll, a digitális counter nem számol. Kicseréltem az egész deck mechanikát, és a másikkal is ezt csinálja, tehát nem azzal van a gond (egy másik hifimben tesztelve hibátlanok). Akkor mi a bánat lehet az oka?! 

 
Rotel RSX-1055 távirányítóra nem reagál
Sziasztok!
Hozzájutottam hibásan ehhez a gépezethez, sikerült is életre kelteni, de van egy apró "hibajelensége".
Az erősítő tökéletesen működik, viszont ha kikapcsolom a távirányítóval (standby-ba), kb fél óra után már nem lehet bekapcsolni a távirányítóval, csak ha az előlapon ki-be kapcsolom a főkapcsolóval.De ezek után a távirányítóval ismét minden működik.
Találkozott már valaki ilyen jelenséggel?
 
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