Service manuals, schematics, eproms for electrical technicians
NATIONAL RF885L 1965 SCH
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Category
AUDIO
SERVICE MANUAL
AUDIO
SERVICE MANUAL
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Good luck to the repair!
Please do not offer the downloaded file for sell only use it for personal usage!
Looking for similar national manual?
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NATIONAL RF-885L RF885L 1965 RF 885
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Relevant AUDIO forum topics:
Sziasztok!
Most került hozzám ez a 5.1-es erősítő, azzal a gonddal hogy csak a mély szól benne, a többi nem. Szét szedve megnéztem, brumra megy minden végfok, táp feszek jók. Merre keresgéljek benne?
Sziasztok!
Adott egy Technics SU-X501 Asztali erősítő. Sajnos a táptrafó problémás. Bementi feszültséget megkapja AC 230V. A kimeneten nem mérhető semmi. Valószínű a primer oldalt szakadt?!
Mekkora feszültségek kellenek?
Keresgéltem és ilyen adatokat találta +60V, GND -60V ,DC 12-13V a relének.
Válaszokat segítséget előre is köszönöm!
Csatoltam képet a végfokozatról, az általam hibásnak vélt táptrafóról.
üdv: Csady
i have a very nice vintage DBX BX3 amp on which at least one channel fused.
power transistors literally burned down.
it is a very nice piece of hardware (4 channels with BTL capability 4x125W or 2x300W)
I would like to fix it myself. Having an electronic engineering degree, i think I should be able to undertake that venture but I never practiced (i've been in software for the last 40 years...)
So I need some guidance on the methodology to diagnose and track what went wrong.
I do have a scope, signal generator and I guess all required tools, as well as the schematics of the amp.
what I need is some help on locating the key parameters to measure and how to incrementally explore the different stages of the amp to find the faulty sections.
I guess I need to isolate the different sections of the amp but then, what ?
any help and advice will be highly appretiated.
üdv: itt néhány rajz elérhető,
http://oldradio.tesla.hu/rajzok/erosito/erositok.html
Bálint
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