hk pm 645 vxi

[sprintertech]

recent purchase but have some expereince from the past with one of these.....

any does and donts? likes or dislikes?

i know this is a newb question but hey im a newb...lol

[llwhtt]

I was given a 645VXI with shorted output transistors in one channel, I finally repaired it. All I can say is what a nightmare repair, the disassembly and reassembly over and over and over again to finally get all of the kinks out. I think the disassembling and reassembling caused more
damage than the initial two bad transistors. The bottom of the chassis is not removable, there are many soldered in ribbon cables, wires, circuit boards, and the whole front panel, controls and all must be removed to the get the main board out, then it has to all reassembled to run and hope you caught everything the first time. I didn't because during all of this disassembly and reassembly I managed to cause a broken solder joint in the other channel which in turn caused the protect circuit to come on ONLY when a signal was fed thru. I did most of this without a service manual and only after finding a manual online did I get to see the protect circuit and find my broken solder joint, and of course disassemble and reassembled it again one last time. Audio wise I think it sounds OK, but I'm biased I just fixed the damn thing. I'll stick with tubes.

Craig

[sprintertech]

no tube expereince here......but i need to do some diag on this hk cause until it warms up its less then perfect....seems to cutout certain frequencies around say 250hz-maybe 1khz...once warmed up its fine....and the balance is unhappy till it warms up too..

[sprintertech]

k...so im and idiot.....amps fine....problem lies within cd player





note to self