(I'm REPOSING my question here, because I'm not sure if I posted this question in an active section yesterday -- I'm a new member)

I've recently had a problem with my 4A speakerphone. A few years ago up until the present, I would either answer or make a call and after about 4 minutes, the loudspeaker would just turn off suddenly. Then, I would try again, but it would suddenly turn off again but even sooner. Each time I would try again, the sorter the time until it would click off until I couldn't even get a dial tone. If I waited about a half hour, it would work for a while, then turn off in the same shorter pattern.

The unit came with a different power transformer unit than the 85B1 Power unit Its "Precision Components Telephone, INPUT 115V AC 60HZ, OUTPUT: 16V AC 375 mA, MODEL: 0501-0372 PC-2012HD-3

I hope this is enough info (If necessary, I'll list all the components).

I'm really hoping I can get this beautiful technical marvel to work as it should.

Many thanks again for your help so far (about the led lamp, Ed)
Rusty