Help with Tek 2430A

Hey everyone.

I've got a 2430a with an issue. When I first start the scope up and perform some measurements the trace and everything else drifts. The trigger level will slowly drift up/down without me touching any controls, I can watch it over a few minutes and it will drift a couple of volts. The trace drifts. The controls dont like to respond to inputs, sometimes I have to push a button or turn a knob 2 or three times for the scope to react, other times it will go on the first try. When I change the V/Div of the scope the trace will shift up or down, sometimes completely off the screen.

Now the interesting part is that if I perform a self cal the scope works perfectly, no drift and the controls work perfectly. I do believe that a self cal in not normally required after every start-up, so I assumed that the battery was going bad or already bad. When I opened the scope up to check it I found that there was none! There is just a jumper in it's place and the associated components like the diode and IC aren't there either. Not missing just never installed, like there was a board revision. The service manual shows plain as day the battery in the schematic and makes mention of proper disposal of it in the first chapter. I've looked and looked for another service manual, thinking there might be another version, but only found the same one that I already have.

A few random tidbits that may help. Self cal always says UNCALD after start up, but passes with no problems. External cal says UNCALD. The manual mentions ready and arm leds, which don't seem to exist on my scope. Manufacture date is 1988 with the last software update in

1990.

I think that's it, if you can offer any advice at all I would appreciate it, I've kind of hit a wall on this one, without a accurate manual I can't really do much. All I can do is guess there is a problem with the memory wich is a pretty broad statement. Anyway thanks for any advice you might be able to give.

Reply to
z28fistergod
Loading thread data ...

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.