Hey guys
I am handy with a VOM, oscilloscope and soldering iron but I mainly work on non-micro-component devices (guitar amps and pedals).
I have a favorite CD/Tape/Tuner unit in my shop. It is a Panasonic SA-PM39D and here is the symptom:
A few seconds (10-15) after I turn it off (hit the soft push button), it will restart in demo mode.
I hear a relay click when I turn it off and again when it turns back on spontaneously.
I really do not know how these type of units do their switching on and off. I am assuming that I might have some issue in the circuit whereby a relay is not holding open or closed based on a voltage dropping or being applied due to a bad cap.
Might I be in the ballpark? Also, with no online schematic, I am just guessing at this point.
Any help would be appreciated. You can talk in EE terms as I am aware of the basics (I understand resistor, capacitor, electrolytic cap, relay, short to ground, etc...). Digital logic and solid state design is my weakness as my stuff is generally basic (take 120v wall voltage, step it up to 390v and then filter it and supply it to the various tube stages).
Thanks
Tim