hello guys, i just bought a used tracker 1000b.It only starts giving trace after sitting powered on for at least 10-15 mins. Doesn't matter i press any switch,it just gives dot for first 10 mins.After that it works normally.I hooked up oscilloscope to the probes and found that it gives no frequency when it throws just dot but i get 80hz signal as soon as it starts giving trace on the screen.So does it means bad oscillator?If its a oscillator,can it be repaired then? I am just a hobbyist and not a pro.Thanks in advance...