success!! i never got the right oscilloscope readings, but decided to give it a go anyway - and it worked! (must have done something wrong with the scope...) well, thanks to the wonderful knowledge gathered in this forum i got a working mx4000 for 20 euro including spare parts. I also found a partly defect beolink 1000 for 15 euro that i managed to

i choose the toilsome way and hooked everything up at the lab... i also replaced C29 and C31. strange thing is that when connected to a 5V DC supply (as according to the service manual) i dont get the described oscilloscope readings at any of the measuring points 1-4 i only get various DC-readings across the bord. anyone have a clue?

ok, ive replaced TR1 and TR11 - both where dead, and checked all the caps around them (next time ill replace them instead, promise!!) so here is my dilemma: i can borrow an oscilloscope from the laboratory im working at and do the 5V test (described in the service manual) but this will take some time and effort. or just do as you suggested earlier and

waiting for parts to arrive... i borrowed a better DMM - i can now measure capacitance. is it correct to assume that measurements are unreliable when in circuit? C31 gives 43.5u instead of 47u. could that be the cause?

is there any other way to check if a cap is working as it should?

yes, im measuring disconnected went through TR1-TR14, so far TR1 and TR11 seems to be out - the rest ok. How about capacitors? Is a broken cap the probable cause? thanks once again for all the quick replies! arvid btw i dont think i can measure capacitance with my cheap DMM...

hmm, 0.6 ohms between E and C on TR1 - that means that it's short circuited, right?

thanks for quick reply!! fuse was blown, diodes D1-D4 ok (is it easy to check the filter?) next i'll check TR1 and C12 is it plausible that the fuse blows without any other faults? thanks again!

hello I read an inspiring post about a dead mx4000 with a happy ending (http://forum.beoworld.org/forums/thread/91170.aspx) and thought that I should have a go at a similar machine with a similar problem. Its a mx4000 beo4 and it says "type:78/34 EDT" at the back. symptoms are: no respons when connected to the mains - no standby light, no

I will, thanks for the tip!