On Sep 21, 2007, at 5:52 AM, John wrote: > Hello Group, > > I just picked up 2 Mastr II VHF Stations minus the power supplies. > When I connect the big Red and Black power leads to the PA to 13.8 > volts, no power reaches the rest of the station. The schematic in the > manual shows a cable from the power supply going to the backplane or > motherboard, but I do not have it. There is a 15 pin connector at the > top left of the rear Chassis (not motherboard) with nothing connected > to it, but I don't see any number reference, so I don't know what > would > connect to it. Can someone give me help here?? Thanks. > > 73, John, K9KA
No you don't connect power there, on the station John. And you're correct, the station and PA are fed separately. Looking at a non-mangled MASTR II station here on the bench, when viewing from the rear, there should be a cable tail that comes from the lower left corner (where the harness is usually neatly tied together) that comes out to a 9-pin molex-style connector. That connector then normally plugs into a female 9-pin on the back of the stock GE power supply. In the case of this particular station, there are two 10 gauge red wires, and one 10 gauge black wire, and the white/blue wire as well as someone seems to have added another black ground wire in this bundle, that all go to that free-hanging connector. Only three pins are used in the 9-pin connector on this particular station, I think (but I'd have to check the LBI's) that the battery- backup option added more wires for power control if the power supply out, but again, would have to look that up. Many stations get removed from service in a hurry by careless technicians, as someone else mentioned, you'll find that the cabling and/or connector was simply cut off. Stupid techs. If it's gone, or if you're using a standard power supply, you'll have to feed the station power from a custom wiring harness. In the station's wiring harness, the (positive) red wires go to different locations, one to the backplane connector J203 and one goes up to the pass-throughs that feed the system board -- the ground wires go to other places... it's all traceable with the LBI schematics. I can dig up the other connector or pass-through numbers, given more time -- but I have to get ready to leave for something else here in a minute. If I can figure out what my wife did with the digital camera, I might be able to shoot a photo or two, if this doesn't help. Maybe a picture would be worth a thousand words. -- Nate Duehr, WY0X [EMAIL PROTECTED]
