Service manuals, schematics, eproms for electrical technicians

DTW 125WHELGOLAND TUBES RADIO SCH

AUDIO - SERVICE MANUAL
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19.1 KB
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Category
AUDIO
SERVICE MANUAL
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    DTW TUBES RADIO 125 WHELGOLAND
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
HiFi SM
Sziasztok!Barangolás közepette találtam az oldalon némi segítséget a szervizeléshez.Egy E-mail cim és egy becenév valamint vissza igazolás után hozzá lehet jutni igen sok HiFi berendezés Szerviz könyvéhez.http://www.hifiengine.com/manuals.shtml Üdv belfi
Trio-Kenwood: KR-3010 [Radio] S.N.962845 / Does not work, the final floor and prefinal floor defect with many burned component/

I greet you! I would need the scheme of this "vintage" amplifier that needs to be "restored". The problem is that in the prefinal and final floor I have many "fried" resistors well, their value cannot be identified.I replaced the defective transistors: 2SC1509, 2SA777,2SB690 and 2SD 796 (each 2 pcs.) and the electrolytic capacitors adjacent to them. I could not go further because of the carbonized resistors that I do not know their value (I can only guess that they are values small, in the order of ohms). The schematic diagram I downloaded, from the address received by the kindness of a colleague is not complete - it is a single page (missing Q29-Q30-Q31-Q3 and resistors R115-R116-R117-R118 which are completely carbonized, at other resistors I could see their value).Thanks in advance!
Finally, I found the missing part

If stuck in the repair and you ask questions, please do it as follows: - Details: Give the exact model number of your device and the chassis ID (if there is). - If possible, please attach pictures of the appliance. - Anamnesis: Write down the exact symptom. If hard to describe the symptom, it is difficult to verbally defined clearly, attach pictures or sound of the phenomenon! - Tell what was you have done so far: search contact error, which parts has examined or changed yet, etc... The incorrectly named topic suspended and will be deleted after 48 hours! Suspended state while others are not able to comment until you correct the address. Subsequent repair of the defective title (within 48 hours) by clicking on the "Edit" tab can be carried out.

MIDI - elekroncsöves hangszererősítők csatornaváltására
Kedves Fórumtársak! Építeni szeretnék egy modult, ami lehetővé tenné egy erősítőben, hogy a 2 különböző csatorna és a hozzájuk tartozó Effect loopok MIDI kapcsolópedállal legyenek működtethetőek, azonban itt falba ütköztem mert eddigi munkásságom alatt sajnos nem kerültem kapcsolatba ilyen eszközökkel... Ezzel a problémával kapcsolatban nagyon nagy szükségem lenne bármilyen tanácsra, segítségre!
Phoenix Gold XS2300 (autóerősítő táphiba) - megoldva
Derűs napot kívánok! A fenti autóerősítővel küzdök Az egyik végfokban mindkét FET valamint a tápban két FET csont zárlatos volt. Ezek cseréje után elindul, de folyamatosan nő az áramfelvétele, amíg hagyom. Kivettem mindkét csatorna végfok FET-et. A táp alap áramfelvétele 12V-ról közel 800mA. Szerintem ez elég sok. A táp +30V/-28V. Ez az aszimmetria sem tetszik nekem. Hidegen mérve minden jónak tűnik. A szabályzás is érdekesen működik, mert ha leterhelem egy 230V-os izzóval a +30V-os ágat, akkor a vezérlőjel impulzusszélessége megnő. Ez csak a +30V-os ágra igaz. Ha a -28V-ot terhelem, akkor leesik a feszültség -26V-ra és nem szabályoz a táp. Jól jönne, ha kitudna valaki segíteni egy rajzzal. Köszönöm. Üdv.
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