Hi Mike, By the number of Micor's that you are talking about, I take them to be converted mobil's not Compa Stations. I have run into this trouble before on Micor mobil's, what I found to be the trouble is the interconnect board uses rivets instead of plated through holes and the solder joint at these rivets go bad. I inject a signal into the receiver's front-end, and then use an oscilloscope and probe along the traces on the interconnect board until I find the offending solder joint.
Gregory AC6VJ --- In Repeater-Builder@yahoogroups.com, "Mike Besemer \(WM4B\)" <mwbese...@...> wrote: > > Greetings all, > > I normally maintain a couple of 'out-of-the-box' (Kendecom) repeaters, but > recently I've been asked to help out with another system that is homebrewed > from Micors. It consists of 4 Micors (TX on 2 meters, RX on 2 meters, TX on > 440 and RX on 440) linked with a CAT-500 and a set of homebrew controls. > > Lately, the 2 meter RX has become intermittent. For a while, I'd been able > to either wiggle the plug on the front of the receiver or give the receiver > a good whack and it'd come back to life, but lately it's become more and > more obstinate. A couple of weeks ago, I brought the RX back to my shop and > pulled all the boards, cleaned the pins and did my best to look for obvious > problems. I really didn't see anything wrong, but when I reinstalled the > RX, it work fine and I thought (after it ran for a couple of weeks) I must > have fixed it. (I have no way of running it on the bench... so it was just > a plug-and-pray fix.) > > Unfortunately, it crapped out again a couple of days ago, and this time > reseating the plug and banging had no effect. One thing I did notice that > I'd not seen before (it's hard to access the rear of the repeater) is that > the plug (on the harness) is missing a piece of plastic surrounding the > three pins nearest the hinged side of the handle. I haven't had time to > pull up the drawings yet to see what those pins are, but I suspect that may > be at the heart of my problem. > > At any rate, I'd like to be able to run this beast on my bench. Where can I > come up with a harness and control, and what (if any) additional hardware > would I need to be able to get this thing hooked up? > > Second, IF the harness plug IS the problem, what's the best course of > action? Changing the plug looks like a real bugger. I haven't traced it up > to the homebrew controls yet, so I'm not sure how difficult it'd be to swap > out the entire harness (if I had one), but either way doesn't look like much > fun. > > 73, > > Mike > WM4B >
