Hi, I just bought this tek and while it passes all the selftests, it's really flaky at startup. When you press the on/stby button the lights blink once , you can hear some relays switching and it goes dead. Then I keep pushing the button and eventually it "catches on" from then on it operates flawlesly. Sometimes it takes 3 tries sometimes ~30. Has anybody seen the simmilar problem (solution would be nice)? Thanks.
"janek77" wrote in news:mH8Jf.42164$ snipped-for-privacy@news20.bellglobal.com:
It's old enough for the electrolytic caps ESR to be rising. Time to re-cap the power supply.Use 105DegF low-ESR caps.
-- Jim Yanik jyanik at kua.net
"Jim Yanik" bravely wrote to "All" (17 Feb 06 02:45:02) --- on the heady topic of "Re: Tektronix TDS340, hard to turn on?"
JY> From: Jim Yanik JY> Xref: core-easynews sci.electronics.repair:358540
JY> "janek77" wrote in JY> news:mH8Jf.42164$ snipped-for-privacy@news20.bellglobal.com:
JY> It's old enough for the electrolytic caps ESR to be rising. JY> Time to re-cap the power supply.Use 105DegF low-ESR caps.
Would it be too obvious if it might be an intermittant power switch.
A*s*i*m*o*v
I'd certainly check into that before replacing capacitors.
I'm almost certain it's not a switch, to me it definitely looks like ps is trying to start , but it shuts down almost immediately on overcurrent of some sort. For now its merely annoing, if it gets any worse I'll try the caps. Thanks.
"janek77" wrote in news:fTvJf.47294$ snipped-for-privacy@news20.bellglobal.com:
It could just be a single electrolytic,perhaps the housekeeping cap that supplies the switching control IC.I've seen PS's do just like you described and it was that one cap with a high ESR.
-- Jim Yanik jyanik at kua.net
For now it seems to be getting better, as I had it plugged in for last couple of days. I,m not rulling a "noisy pushbutton" completely out (yet), but to me it seems like that whatever cap is responsible it seems to be "forming" again. There two distinct possibilities:
1: "noisy" switch, which is getting better with use or 2: a cap thats getting "formed" after long discharge. Whats your pick?I'd suggest replacing the electrolytic caps in the power supply. I had to do that with my Tek 2225 before it would start behaving itself.
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