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Excellent answer. That's exactly what I found in one of my 475s that was DOA when I got it. Regards, Bruce W4BGW

By definition, a relay is the strongest device in the input channel path, great probability that bad solder or bad resistor is the guilty one..not the relay..but who know?. Check the manual, if I

Hello, I've seen a 7704A, the seller is selling it as non working unit, he has no plugins, so simply powered it up. He says that the scope powers up and it's visible the point on the screen, the

Just for the record, here are some pictures of a standard 576 test fixture and the bay it fits into. On this 576 there are no holes for screws to secure the test fixture for shipping. The threaded

Hi, I found the cast aluminum side was bent just enough to hold the fixture in. I broke off the damaged edge trying to straighten it. The fixture removes easily now and spraying the switch with

Can anyone shed any light on this problem? If the relay is bad, is there a source for it?

Is there a screw in the bottom? Tom

I just removed the test fixture from a 576 and there was no trick required. Once the two thumb wheel screw are loose, 30 pins of 32 pin connector are all that holds the test fixture in. There are 2

Hi, I made a mistake again yesterday and ask for help on a 172 test fixture. I found I was wrong. My fixture is the Standard 576 test fixture. Looking at the schematic I do not see anything but the

well Tom .. I live 20 km from Rome, I have already 'put a email help for my teak on the national site,,, but it seems that no one owns 2445 Tonight lighthouse 'checks again hoping that you asked me to

Hi Luciano, I am running out of ideas for the simple fix of the scope. I am not sure of the reading you saw on U800 pin 11 and was hoping someone could check it on a good scope. Can you look at pin

Hello Tom you... have a good idea? ------------------------------

The same problem occurs with active probes that plug in the smart scope interfaces. I needed to educate two teams of probe designers (One at Tek, one at LeCroy) on this topic. Blowing the gold and

I need to reach phmessinger but I do not have his email address. Please contact me off list. Thanks, Dennis

Hi John, Taking your guess just a bit further, I would guess that one of those pesky tantalum capacitors is the problem on the mainboard. Check the resistance to ground of each low voltage supply at

My 475A Oscilloscope powered up fine and as I was adjusting the trace, the scopejust died, like a classic scope putting itself to sleep. I can still hear the power trans-former and the fuses on the

I don't think that's the problem. I had the scope input on 1Mohm by accident and it showed the exact same wave shape (but obviously a totally incorrect amplitude). So that seems to indicate that the

No, but the scope I'm using has switchable 50 ohm inputs so that should be ok. Kurt

To add my $0.02 worth, here's what I have seen: Hot swapping any plug ins (in anything) can and will cause these failures: 1. Contact burning/ spot arcing at the mating connector caused by the surge

No affiliation: http://dallas.craigslist.org/ndf/ele/3098424985.html Jeremy, AKA "mescalero"