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DE FOREST CROSLEY LTD. CANADIAN 504A-B-C-F 851A 851B SCH

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
57.5 KB
Page
2
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    DE FOREST CROSLEY LTD. CANADIAN 504ABCF 851A 851B 504 ABCF 851 504A 504A-B-C-F
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  • See related repair forum topics below. May be help you to repair.
Warning!
If you are not familiar with electronics, do not attempt to repair!
You could suffer a fatal electrical shock! Instead, contact your nearest service center!

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Relevant AUDIO forum topics:
Laney rajzok, ha érdekel valakit
üdv: http://www.guitarelectric.eu/sch/Firmowe/LANEY Bálint
Beta 4 (MADE BY GRUNDIG) kód kellene
Üdv Mindenkinek! Van egy radio:VWZ2Z2R2863991 a sorozatszám. Létezik kalkulátor vagy csak a prociból lehet kiolvasni a kódot? Köszi
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.

Denon AVR-1906 végfok alkatrész
Sziasztok! 
Hoztak hozzám a címben szereplő végfokot,amiben a center végfok elfüstölt. Első ránézésre megrendeltem a végfok darlington párt,gondolva a többivel majd boldogulok. Szétborítva szembesültem vele,hogy a panel másik oldalán van két sorba kötött smd diódapár,ami szintén szétégett.Amit találtam hozzá rajzot,az majdnem stimmel,csak a panelon lévő szétégett alkatrészek az általam talált szervízkönyvben(AVR-1906/AVC 1620) nem szerepelnek. A keresett két dióda pár az alábbi bekötésben szerepel:Q103C emitter>D102CT>ZD102CT>D101CT>ZD101CT>Q103C kollektor.ZD102CT ésD101CT közösen R118-ra csatlakozva. Ha esetleg valaki tudna segíteni ezek beazonosításában, vagy az ennek megfelelő szervízkönyvvel,akkor azt nagyon megköszönném.
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