Service manuals, schematics, eproms for electrical technicians

HEATHKIT A-9CS SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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  • Also known:
    HEATHKIT A-9CS A9CS CS 9CS
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
KENWOOD KR-V45 kapcsolási rajz kellene....Equaliser gondok..
Sziasztok! Nem tudom mi lehet a gond az erősítő 5csatornás equaliserével.2 db M5227p ic vel van felépítve.Bekapcsolt EQ állapotban az erőlködő egyáltalán nem szól,kikapcsolt(defeat)állásban meg szabályoz(lefelé) az adott EQ frekvenciákon a potit felhúzva gerjed egy szint után.Rajz kellene mert így elég áttekinthetetlen a jel útja.Hanggenerátorral próbáltam követni de már kissé belefáradtam. Üdv!
Samsung Max N52
Sziasztok! El kélne egy kis segítség. A következő probléma a tipússal. A végfok megy de a hangja alig van illetve selypeg.De az is max körűli hangerőn. A kijelző szerint eleje megy,kiválasztható minden bemenet. Ami még furi,hogy van a tápon a kijelző villanyában pár zéner RZD5-3-2 nagyon izzanak (elszinezödőtt a panel). Nem tom van -e köze a két dolognak egymáshoz. Lehet ez typ, hiba? volt már valakinek ilyen gondja ezzel? Segítséget előre is köszönöm. András
Klipsch ProMedia 2.1 Amplified speakers


Original problem is no sub woofer output. Been through this one and recapped it and the common 2 burned 1K (R16/17)
resistors are replaced but the sub is still not responding. Volume control potentiometer is a common issue on these but
the L-R spkrs sound good.

Went by this webpage on the repair:
https://christopherbradshaw.net/The_Project_Bin/klipsch%20promedia%20subwoofer%20repair%20-%20page%201.html

On the schematic there is a sub-relay (sw101) powered by +V_HF line it
maybe is suppose to be +V_LF ? Without the relay coming on looks like the sub is disconnected.
The zeners (D03/04) that give +/- Vcc to the op amps seemed way off so I replaced them and the voltages seem much closer.

Theres also a sub-mute line on p104 to p101. Power supply shows the LF mute relay and interconnect diagram says it
gets fed from the LF amp. What is triggering the mute? I dont see a mute button anyplace.

Bang and olufsen B&O Penta speaker amplifier 6602 circuit diagram
Hiya, am seeking a Penta amplifier circuit diagram. I have found a few on the web but this request relates to the input board. Early Penta Mark1s used an input board numbered 8002831 and used 6 transistors. my board is numbered 8002831E and looks similar  - but in addition to TR1 to TR6 I have TR8 Tr9 TR10 TR16 TR16 on the circuit board. As its this board that is not working i'm quite keen to get hold of the right circuit diagram. The case says Penta 6602. Any help greatly appreciated. Happy New Year
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