My Mark Levinson 380S preamp forgets its input names and gain settings after it is powered down and back up. If I reprogram them they are restored, however, after powering down and back up at a later time they are forgotten. There may be a default labeling of inputs when not programed, for instance input 1 always comes back as CD 1. Is there a charged capacitor that maintains the settings of a memory chip or perhaps something wrong with the memory chip and does anyone know which one it would be? The preamp works normally otherwise.
Highly likely there is a backup cap or backup battery somewhere. Usually these can be found just by a visual look over the boards as backup caps are quite distinctive from others.
It may well be on a front PCB close to the uP (Microprocessor)
It may well be on a front PCB close to the uP (Microprocessor)
Strange you say that as I caught an old episode of DS9 today where glial cells played a big part.