I have an old Tektronix 3347A 100 mHz scope with an control problem. Power-up is OK and runs fine for about 5 minutes then all buttons become inoperative (all lighted buttons go dark) but CRT display is fine.
Anyone know of a website with ideas for this scope?
Thanks!
"Jim Lacko" wrote in news:%g6Cf.4961$ snipped-for-privacy@newsfe10.phx:
I never heard of a TEK "3347A" o'scope,old or new.
I suspect you mean "2247A".
First you need a 2247A SERVICE manual. (At least those still had schematics in them!)
The top PCB is the microprocessor/digital board. You may have a thermal problem with some IC on the uP board.
Jim Yanik wrote in news:Xns97577933AE289jyanikkuanet@129.250.170.84:
It's also possible that the PS filter caps for the 5 volt supplies have degraded and ESR risen.Of course the first circuit checks should always be the power supplies;DC voltage,ripple,and regulation.
While I'm not familiar with that series, by the description of the problem I'd start my search at the power supply.
In article , snipped-for-privacy@hotmail.com (known to some as James Sweet) scribed...
That's good advice. The second thing I'd do is pull and re-seat every single socketed IC. You'd be amazed how many problems result from simple pin oxidation.
Keep the peace(es).
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