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Hi, Sorry I have got side tracked doing other things at the moment and have really not had any time to work on the SA. From memory whent I tested the CFC and Log board pulse signals to the

Yahoo Neo did not like JPEG attachments, so I have uploaded them to http://groups.yahoo.com/neo/groups/TekScopes/photos/albums/85295469 Cheers, Magnus

Good Day, I know that this is a bit silly, but I could not resist to please myself with a Tektronix storage compartment or tool box, part number 016-0362-02. This is a somewhat interesting accessory

I have no experience with the Tek TDS series scopes but I have lost one set of data from a Dallas chip in an HP 3458A. I have three of these meters and have removed all three Dallas chips from each

More info please. What programmer are you reading and writing on? What IC equivalent? Unless you of course have a programmer that can specifically do the Dallas DS1644. What do you do to compensate

That is the normal sawtooth of a switching power supply.? As long as its low in amplitude you can ignore it and come back later. That sounds like the microprocessor clock.? 40 mv is small enough to

I have replaced enough of the Dallas parts on TDSXXX scopes that I think I can add my .02 worth. My best recommendation to replace these parts is to purchase a good desoldering tool such as a Hakko

Does anything in the -8 volt circuitry get hot after running for a while? Sounds like something heating up and drawing excess current and causing the supply to go into protection mode. Tom

I had no problems removing the two Dallas NVRAMs in my 2440 using just a Weller DS227 vacuum desoldering tool. They practically fell off the printed circuit board. I actually bought the DS227

I will have to keep this in mind. The 1A4 is one of the few plug-ins which would make my 547 regularly useful to me.

@ snapdiode: True, I won't know any more about a new one, but at least if I destroy my existing plug-in while trying to fix it, I'll still have another one to use ;-) MDA.

Well, you won't know any more about a new 1A4. I think 1A4s are a high-strung plugin, there's a lot that can go wrong in there. I find the assembly of the input attenuators is fragile, it's just

If my calculations are correct then a "shortcut" output of -2 V (reported previously) would correspond to about 0.5 A output current. This current drop is due to foldback current limiting. Hence your

I replaced the bridge rectifier and the filter cap, but I still have the same problem. the resistance between TP and GND is 52ohm. I measured the current at the output of the bridge rectifier and

The best way to remove any chip on a heavy board is to heat the chip and surrounding area with a heat gun just prior to using the desoldering tool. Now, too much heat gun can damage the board, but

:) I checked this out again, and it's well inside spec. The ripple is "ugly" though, e.g. there are sharp spikes at ~20/40kHz. Assuming I get it working, I'll be planning to do the recap. One

@ taylor: Thanks for the part number. - I checked it on Mouser in the UK and they seem like the original switches:

Anyone have Tomas Larson's direct email address? I have tried contact several times through his Ebaman webg site and my inquiries have gone un answered Dave ArtekManuals --

I do belive there is a suggestion to not to try to read it for 24 hours after desoldering. In some other Tek scopes, it recommended to unsolder a certain pin LAST, because it's the most massive.?

Didn't work for me. I'm experienced with desoldering IC's and have the equipment but these are a bummer to get out, too much ground plane. I decided to try replacing the chip because the scope was