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RUSSIAN RODINA BATTERY RADIO SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    RUSSIAN RODINA BATTERY RADIO
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Relevant AUDIO forum topics:
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.

Yamaha psr-s500 szintetizátor - kijelző egyik fele sötét - Megoldva
Sziasztok! Yamaha psr-s500-as szinti kijelzőjének egyik fele ne működik. Minden egyéb működik rajta, kontrasztot tudom állítani viszont a jobb oldala a kijelzőnek ha feltekerem a kontrasztot teljesen elsötétül ha leveszem a kontrasztot teljesen világos. Segítségeteket kérném, hogy hogyan tudnám megállapítani hogy a kijelzővel vagy a vezérléssel van a gond? Üdv.: Norbi
kapcsolási rajzot keresek
SANYO DCX29 -es Hifi kapcsolási rajzát keresem. Aki tud valamit küldeni róla az legyen szíves a hanzi0122@freemail.hu címre elküldeni. Kösz
alpia ptx-800 -as autós végfok halkan recsegve szól
Van ez az alpia-ptx 800 -as autó végfok,2öt kaptam belölle gondoltam az egyiket megcsinálom mert a másik tápbajos is volt.szóval nekiálltam a "jobbiknak"aminek bekapcsol ledje zöldre,de hang csak nagyon kicsi és amikor dob van a zenében akkor reccsen,cseréltem benne fet-eket,az eredeti cep75n06 helyett irf3205-öt tettem,cseréltem már majdnem minden elkót mert némelyik tényleg kivolt száradva,de a hejzet ugyanaz.ami nekem furcsa,hogy 4 db azonos fettel müködik (irf3205) de az egyik pár feten amelyikre a -20,9 volt érkezik az rajta van a source-ön és a gate-en is egyaránt,ami szerintem nem egészséges.ebben szeretném ha segitenétek,mertmár kifogytam az ötletekből.A képek nem a legjobbak,de kb igy néz ki a táp ic tl 494cn.
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