Service manuals, schematics, eproms for electrical technicians

NATIONAL RF883L 1966 SCH

AUDIO - SERVICE MANUAL
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SERVICE MANUAL
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  • Also known:
    NATIONAL RF-883L RF883L 1966 RF 883
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  • See related repair forum topics below. May be help you to repair.
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Relevant AUDIO forum topics:
JBL SB250 subwofer panelon sérült IC azonosítása
Sziasztok!
Fenti panelon az L102 mellett és a D101 fölött megégett 8 lábú smd eszköz van.Dc konverternek gondolom.Ami olvasható rakta 5.31.  5 AM.   7K.
Tud valaki segíteni? Üdvözlettel Reparator1
Pacsirta URH áthangolás
Üdvözlöm a kollégákat! Egy pacsirta rádiót szeretnék áthangolni a keletiről a nyugati URH sávra ha lehet úgy hogy tudja a teljes tartományt. Erről szeretnék információt kapni ha valaki csinált már ilyet. A megváltoztatandó értékeket szeretném tudni (kondik, tekercs). A próbálgatás kissé körülményes mert minden alkalommal ki kell szedni a hangolótekercset, és kicsit tartok tőle hogy a sok beavatkozás csak hibát okoz. Az is érdekelne ha valaki csinált már hogy milyen lett az eredmény? ÖregTom SzBálintot javasolta hogy talán Ő már csinált ilyet. Előre is köszönöm a segítségeteket. Üdvözlettel: Majzinger
Videoton rt7300s rádió tuneren FM sávon csak zaj van
Hozzám vágtak egy Videoton rt7300s tunert. Van benne élet, viszont fm sávokon csak folyamatosan FM zaj van.( nehogy szó érje a ház elejét , nem súgás) Hangoláskor a kijelzőn úgy tűnik, mintha működne, meg meg áll, de csak az FM zaj marad. Az FM mute gombra nem reagál. Automata keresésnél elnémul a keresés alatt, kéziben folyamatosan FM zaj. A feszültségek rendben vannak. Az AM sáv hellyel-közzel működni látszik, de erősen zajos az adó. (csak a Kossuth szólal meg)  Keresgéltem a fórumban, de ilyen hibáról még nem számolt be senki.. Minden ötlet jól jön.
Előre is köszönet mindenkinek.
 
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.

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