Hi everyone,
I had couple of HM1008 scopes repaired 5 years ago all with the input capacitor blown. Each unit started to fail one after the other (couple of months apart) giving out thick smoke *magic blue smoke. I replaced the rifa caps and the units have been working fine since.
But I had the same problem occur couple of days back, and it was the first scope which became faulty and the first scope I replaced the cap. Now I'm afraid the rest of the scope are soon to follow.
I know Rifa caps are notorious to blow up like this, but from what I have seen they should last for a long time. 5 years is too soon no?
Any idea what could cause this? Could varying mains voltage cause this?Also noticed that the cap is very tightly packed with the heatsink touching it.
Finally any suggestion on a suitable replacement which could be more reliable? When I replaced the caps I replaced them with the exact same one.
Thanks in advance.