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Hello Tom, I thought that was one of those Tek products with cheap TI sockets. Tek continued to use those sockets long after computer industry abandoned them. Miroslav Pokorni

Hello Miroslav, The original ram was soldered in. I installed a 28 pin milled pin, low profile socket and the new ram. I did not try to check the old ram as I clipped all the pins close to the package

wrote:

Did you try to put old RAM back in? Those large sockets, like one used for RAM are of poor quality and over time contacts corrode and loose connection. I saw that in 7D01; socket was 16 or 18 pin, but

Good that you found the cause Andy! I think the bias re-adjustment won't be necessary any more after you adjust all 3 pots in that section. Albert

That was it. Changed the ram and it calibrated on the first pass. It was a D4464C 8Kx8 ram. Thanks, Tom

I borrowed a 10 mA 152-0140-01 tunnel diode from my 7B52, and I think I've confirmed that the only problem is the tunnel diode. Delayed triggering appears to work properly now (although I have to

Hi Andy, Please see below. Albert No, CR354 is OK now. The pulse should at least be present at TP421, which is directly connected to TP365. Check that the delayed sweep is present at TP462. Set the

After some more thinking, and re-reading the supplemental circuit description, I realized that my previous line of thinking was a dead end. CR950 is what should be triggering the delayed sweep, so I

Hi Albert, Here's what I'm seeing in intensified mode when triggering from TP408. TP365 has a brief pulse down to 0 V at the start of the sawtooth ramp at TP408, then immediately goes up to about 570

Hi Bob, Yeah, I am kinda thinking the same. It did have a dead battery when I got it. Also, I said it was a 2445A but it is a 2465A but that doesn't matter for this problem. Same A5 board I think.

I think you have a bad RAM chip. ________________________________ To: TekScopes@... Sent: Monday, October 15, 2012 9:48 PM Subject: [TekScopes] 2445A Calibration question ? I am getting a

I was amazed, after looking for the proper screwdrivers, finding these bits were available as part of a set that cost about $5 dollars in the local store. I bought the set and it includes a nice

Hi Paul, I have bought many of those "sets" over the years and never found a Pozi bit. They may be a recent addition to the sets as the manufacturers of these sets seem to be competing over how many

Yes. I meant hardware store in the USA. And Yes! I know about and respect that we are just one country among many nations around the world. I consider myself fortunate that I live in a unique place

Pozidrive screwdriver tips are available in most DIY stores like Lowes, Home Depot, Menards, Harbor Freight etc.---if you know where to look for them. They are included in many of the multi bit sets,

George I started a new thread here with the correct model number which will likely draw you better attention You must have us partially confused with another dealer as we do not sell a "set" for the

Hi Andy, Here some more details. Maybe you feel unsure about waveform voltage levels. In Normal sweep mode, TP365 (the TD) is high (570 mV, my 7B92) during the sweep and low (65 mV) between sweeps

Thank you Dave - you are most correct - it was early morning - it is MR501. I have a few of your excellent scans and you are "in my back pocket". MR501 is not on your TM500SET which I have. I just got

George You sure about the model number? I can find no reference to the unit anywhere in the literature? Could it be a MR501 ? ( We have the manuals for the MR501 :-) ) Dave -- Dave Henderson