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DYNACORD MADRAS M212 M15 M18

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    DYNACORD MADRAS M-212 M212 M15 M18 212 15 18
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Relevant AUDIO forum topics:
Dynacord Powermate 1000-2 mixer amp fault - Help needed

Hiya
I am repairing a Dynacord Powermate 1000-2 mixer/amp and have a question about DC blocking capacitors in the signal path.

 

I am getting a slowly dropping DC on the DISP1 node (output of I6AA op-amp) on switch-on.  This is causing the green "signal present" LED to come on on that channel which takes about 30 seconds to turn off.  It seems to be caused by a charge on C35A that dissipates slowly through R54A (1M Ohm).  

 

It seems to me, it would have been better to put the C35A on the output of I5AA with a resistor to ground.  Is there a reason why this would not work.  

 

I have checked all relevant components and power supplies and I cannot find any faults but I'm sure this is not normal behaviour.

 

Any help greatly appreciated.

PM1000 tone circuit

signal indicator

 

 

 

dynacord gigant v
Sziasztok! Szükségem lenne a dynacord gigant v kapcsolási rajzára Szereztem egy ilyen szép példányt, de hiányzik egy bemeneti, kimeneti panel a hátuljáról. Sajnos az adatbázisban csak a gigant 1 található, ami csöves, ez pedig MJ15003-MJ15004 komplementerrel megy. Előre is köszi
Dynacord pca2250 erősitő instabilan működik
Hali mindenki. 

Adva a fenti fetes, békebeli erösitő.
bizonytalan működés jellemzi..mérés, kontakthibák, kondizás, poticsere után már csak az előfokban lévő (processornak mondott") fekete, beöntött 32 lábú modullal van a gond...
Az egyik oldali nem.mindig ad ki jelet..
a másik oldali pedig torzitott jelet ad ki.
ha kiveszem ezt a modult és a be-kimenetet átkötöm akkor működik rendesen...a rajza alapján ez a modul szabályozná vissza a végfokot túlvezérlés esetén is ..
Ismeri valaki ezt a modult? Gondolom a beszerzése már reménytelen..esetleg bontásból..
Csatolok néhány rajzrészletet erről a modulról..

Üdv.LF 
Dynacord L1600 idling current?
Üdvözlet!
Dynacord L1600-os végfok gyári (szervizkönyvi) nyugalmi áram értékét szeretném megtudni,VR1,VR2 trimmer kontakt hibája miatt.(közel 30 éves a cucc)A CNSERV 2,3 és 5,6 pontokon beállítandó mV-értéket.A rajzot megtaláltam a tanyán.
Köszönöm a segítséget!
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