Jo napot mindenkinek!! Hoztak hozzám javításra egy Videoton RA-4312 SG-s lemezjátszos rádiot. azzal hibával hogy a lemez lejátszásakor csak az egyik hangszoro szol és a rádio néha szol,néha nem. A lemezjátszoban sajnos a fej a hibás-VK4203. Esetleg hol lehetne ilyet beszerezni??? A rádio részben pedig a hangolo kondenzátor a rossz-ha kicsit megütöm müködik. Lehet ezt javítani,esetleg valakinek lenne otthon elfekvö készletben?? Ja,s találtam még a rádiobak kiesve ezt a tü szerü dolgot,ennek vajon hol lehet a helye??? A válaszokat elöre is öszönöm-Stanley
Dear Friends,
I am having a problem with the above mentioned amp. When I increase the volume from 0 to a quarter level the sound is OK. If I increase the level above quarter onwards , the sound becomes fuzzy and distorted. I have tried replacing the 2 filter capacitors(8200uf 50v) with 2 (15000uf 50v) caps but it is the same. Can someone give me a clue what can be causing this problem.
Thanks
Carlos Rajoo
Üdv mindenkinek.
A fenti mini HiFi rajzára lenne szükségem. Ha valakinek megvan, megköszönném.
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
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