Service manuals, schematics, eproms for electrical technicians

AMPLIFIER THE MJR-7 MOSFET POWER

AUDIO - SERVICE MANUAL
Type: (RAR)
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Category
AUDIO
SERVICE MANUAL
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    AMPLIFIER THE MJR-7 POWER MJR7 MOSFET MJR
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
Monacor_PA_940_power amplifier_240w A végfok nem működik. Előfok jó. Tápok rendben.
Üdvözlök Mindenkit!
Nagyon megköszönöm, ha valaki tud segíteni.
Technics SU-Z200 amplifier, végfok védelme, javítása (megoldva)
Tiszteletem a Tanyalakóknak! Szeretnék segítséget kérni Fent nevezett erősítő javításához. A jelenség: ha a pótméterrel növelni akarom a hangerőt, akkor a 1/3-d fölé érve elnémul, és csak ha kikapcsolom, a potit kicsit lejjebb állítom, és visszakapcsolás után jön vissza a hang. Az 5. képen látható R803-as ellenállást én tettem bele, mert az elődje, enyhén szólva megpirult. Ez is melegszik nagyon. Jó lenne valami rajz, hogy tudjak molyolni benne. Minden segítséget előre is köszönök Üdv Mekmuki
PA Amplifier TA-403E nem erosit,torzitja a hangot
szervusztok
kertek ennek az erositonek a javitasara,nem erosit,alig van hang,azis torzit
eleg regi az erosito,viszont kivalo allapotban van
amit ellenoriztem,a tap 35 v,a kimeno fokozatban a tranzisztorok jok,a meghajto tranzisztorok is jok,az eloerositovel folytatnam
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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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