Gefunden für 2280a electronic privileg - Zum Elektronik Forum |
| 1 - Noisy picture -- Videorecorder Grundig 2280 a |
| Hello, Stego.
That was my mistake... I'll never wear them if I repair some electronic equipment... If I remember correctly, I've shortened something near B1 connector on "Ablaufsteuerung" board... I've downloaded all documents about 2280 and 2280a models that were available on this forum. Sympthoms are: black display, no response on any buttons... Only when I turn VCR on (by big button 0/O) it makes startup-sequence (rotates big ring with tape guides half a centimeter forward, and then back). And it looks like processor is alive... I think that VFD-driver died. What should be on /RESET pin of B1? Should be any pulses on /RQ? I see with my multimeter that there are pulses on SDA and SCL. And! I remembered! There were "click" sound when I touched solder pionts... Maybe there were arc between watch and points 
Desoldering of big ICs is not a problem at all. I have all necessary equipment. Another problem is where to find replacement parts and to know exactly, is this part really broken Now I want to test VFD/Keyboard controller, but I don't know how to do it...
And I've noticed, that transistor T... |
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