Service manuals, schematics, eproms for electrical technicians

SONOFON PRESTIGE-439U 1942 SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    SONOFON 1942 PRESTIGE 439 439U
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Relevant AUDIO forum topics:
Mackie ProFX12 V2 Request for schematics and repair knowledge
Hello, I am in the process of repairing the Mackie ProFX12 V2 mixer for a client, and am running into the unavailability of schematics. Does anyone have a copy they could share? I have already reached out to Mackie directly but am still waiting for a reply.

Additionally, I am having trouble identifying the failure mode for the two channels that have failed: one produces loud static (indicating bad op-amp or feedback resistor perhaps?) and the other has the right channel producing a 60hz hum, the other is functional. (see board photos, with the two failed channels being marked with "F". The browned area is residual flux from having replaced two opamps, and having reflowed other components around them)


Any help on either of these fronts would be invaluable. I have mainly worked in laptop and computer repair, and am just getting started with my first scope and first set of board level repairs. 
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ITT Nokia st 741
Egy ITT Nokia ST 741- es music centerhez keresek magnó dekket. Ha valakinek lenne ilyen kérem írjon. Előre is köszi a segítséget.
Onkyo TX7830-nel a hangerogomb forgatasara a hangszorok membranjai ki/be mozdulnak.
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