Re: Weird cursor problem on 2465 scope
Yours is the first one reported on this group in my memory. Was it cracked or any physical damage apparent? I would agree to avoiding pulling the main board but I would extract the leads one at a time
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Tom Miller
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#111708
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Re: Weird cursor problem on 2465 scope
Finally following up on the cause of this failure... It turned out to be a faulty C853 on the main board. I put a DMM across it in circuit and got about 300 ohms, even when I reversed the leads. That
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Scott Burris
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#111707
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Re: Complete List of TM500/5000 Mainframe Pass Transistors
Hey Magnus, thanks, but the credit is all to Jerry & Dennis, as they did all the hard work of gathering and collating the data. I just pushed their data into a spreadsheet, took me all of 10 minutes.
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Sigur?ur ?sgeirsson
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#111706
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Re: Weird cursor problem on 2465 scope
Hey Panos, is this your scope in this video? Looks very similar to what Scott describes. Did you fix it yet? Siggi
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Sigur?ur ?sgeirsson
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#111705
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Re: Complete List of TM500/5000 Mainframe Pass Transistors
A word of thanks to Jerry, Dennis and Siggi for the time you have spent when creating and releasing this very useful list. Highly appreciated! Cheers, Magnus
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magnustoelle
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#111704
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Re: 2445B Readout problem
That all makes sense from what I remember of the 2445B readout design. The way I remember it, there are different conditions neccessary for interrupting the trace to generate the readout or part of
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David Hess
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#111703
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Re: 2445B Readout problem
Hi David,Yes, atthe end of the sweep the RO is drawn and after that another sweep starts The mainproblem was a leaking aluminum capacitor in the Readout area and it had destroyed quite a lot of the
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rensetel
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#111702
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Re: TEK 2236 sweep problem
When you say "sync works", do you mean that the triggering works? Get a service manual and make sure that you checked all of the low voltage power supply voltages. Do you have another oscilloscope to
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David Hess
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#111701
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Re: 2445B Readout problem
The readout multiplexing with the trace on the 24xx series analog oscilloscopes is complicated. If the readout is only being drawn at the end of a sweep, then it should be apparent at even slower
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David Hess
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#111700
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TEK 2236 sweep problem
My 2236 has just failed. When I turn up the intensity, the horizontal sweep moves to the right,leaving half the display blank. The left edge of what is displayed is compressed. I pulled the cover and
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e9m47
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#111699
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Re: isolation transformers
I like to use the isolation transformer on the device under test to isolate the neutral which is then connected to ground at the point where the probe ground is attached. This isolates the neutral
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David Hess
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#111698
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Re: Help in using TEK Differential Amp to check Switchmode Supplies
Besides the safety issue, another thing to watch out for when floating the oscilloscope without an isolation transformer is that excessive voltage across the oscilloscope's line transformer may cause
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David Hess
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#111697
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Re: Help in using TEK Differential Amp to check Switchmode Supplies
[TekScopes] <TekScopes@...> wrote: <snip> Get yourself an Airline 74BR-1502B. They took care of the flimsy cardboard cover problems by screwing a nice metal plate to the back. Yes, its an
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David Holland
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#111696
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Re: Testing Electrolythics and ordering replacements
Regarding quick & convenient modern component testing. I suggest this item which I and several others I know (net 200 years electronic experience) have built and are full of praise for!
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mosaicmerc
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#111695
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Re: Testing Electrolythics and ordering replacements
When I have found one bad aluminum electrolytic capacitors, often tests show that the dissipation factor of the others has become several times the maximum listed in the specifications. A couple of
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David Hess
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#111694
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Re: Using different values of smoothing capacitor for 475 test
Hi Alan, If you plan on using remote supplies with your local supply you need to insure that during power up you do not allow a situation where a supply has voltage applied to the output before it is
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jerry massengale
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#111693
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Re: Using different values of smoothing capacitor for 475 test
Thanks Jerry, My last statement was really about swapping the psu by disconnecting it some how, and injecting in my own DC rails of the same rating, but I think i'm a bit ahead of myself. Regards Alan
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alan_w_global@...
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#111692
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Re: Help in using TEK Differential Amp to check Switchmode Supplies
Hi Tom, OK, no offense taken. Usually they aren't, but they usually are recessed deep enough to rule out any chance of touching them. One of my related hobbies is collecting and restoring antique
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Manfred Mornhinweg
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#111691
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Re: Recent nasty post.
Howdy, ? ?Was your Laptop "stolen" or "Hijacked"? ? If stolen, how did you get so lucky to get it back? ?If you did physically recover it, I'd love to know how. ?Tracking software? ? Or do you
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Daniel Koller
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#111690
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Re: Recent nasty post.
When I saw the post, my immediate reaction was "What the..." until I realized that I had seen this type of attention-grabbing post before, from spammers, or nut jobs, or sellers of body enhancement
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Mike Dinolfo
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#111689
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