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AMPLIFIER POWER MOSFET 230W-400W

AUDIO - SERVICE MANUAL
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Category
AUDIO
SERVICE MANUAL
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    AMPLIFIER POWER MOSFET 230W400W 230 400 230W 400W 230W-400W
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Magnat Car Amplifier Xcite 560
Üdvözlet mindenkinek.Egy Magnat Xcite 560-assal küzdök.A végfok tranzisztorai B778 és D998.Ilyeneket sehol sem találok.Kérem segítsen valaki azzal,hogy megírja a helyettesítő alkatrészek típusát,amit kapni is lehet valahol,vagy esetleg olyan készüléket,amiben ugyanez van,hátha tudok szerezni valahol egy rosszat,amiben van két jó végfoktranzisztor. Előre is köszönöm a válaszokat.
Denon PMA500V amplifier
I have and found most of the voltages as indicated on the circuit diagram, till op amp M 5218P; are near those specifed. The output on the centre of the two power transistors of both the channels are also alright.

While looking at the voltages on test points as mentioned on the page 7 for setting up quiscent current, these cannot be set.

Bit of history,  the amplifier was lying unused for long time. Nothing in it has burnt. It was never opened earlier than this time, couple of days back.

While I was probing for voltages with DMM, with probe on collector of TR413 one of the fuses blew up. Later same thing happened on the other channel as well.

With the above as background can a Good Samaritan  figure out feasibility of repair.

i am unable to upload service manual as file size is 7.3 mb
schematics wanted for a strange amplifier
Hi to all, I am looking many days for schematics for the LAX MA7200 audio amplifier. I think it is made in far east and is copy of other model, probably a QSE brand. Similar to this-or made from the same factory-is the ODY-PRO 7200, which has a board with a printed label "XILICA" which is a Canadian company. Any of the schematics is great help for me, as I have to service more than 20 units. In case you met any of them please inform. Thanks for your time for reading
AKAI TP-750 Tuner/Pre amplifier ERROR hibaüzenet
Sziasztok!
Belefutottam egy MX750-es mini hifi 3 egységébe. A tápegység és erősítő modul (PA-950) működik, tápfeszek megvannak, a végfokozat mindkét oldala hanggenerátorról meghajtva megy.
Ha összedugom a Tuner egységgel, a végfok bemenet - valószínű némítás miatt - már közvetlenül nem vezérelhető és a Tuner modul bekapcsolás után pár mp.-re ERROR 00 hibaüzenetet ír ki.
A panelon a tápok megtalálhatóak, a proci kvarcok rezegnek, egyenfeszültségek a doksi alapján szúrópróba szerűen  az IC-ken megvannak, kijelző sötét, nyomógombok semmit nem változtatnak..
Az elérhető doksiban sajnos semmi segítség nincs, a szkennel rajzrészletekből megfejteni a működést lehetetlen.
Neten jóformán semmi további infót nem találok.
Érdemes vele küzdeni vagy kuka?
Ha a EA-750 Sound processor modult is összedugom a tuner egységgel, semmi változás, a kijelző itt is sötét.
Reset működik, de nem történik semmi.
Valaki küzdött ilyennel?
Minden javaslatot előre is köszönök.
További szép estét!
Sándor
 
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