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Hi David, On "my" schematic 34 there is no U1620A or U2 and no D181 or U3. I found the TL 72 OpAmp. I have a U900 aa vertical D/A converter an a U1010 as horizontal D/A converter. Gerhard

Those fragile plastic flex connectors are impossible to find as far as I know, but I question whether a flex coupler is even needed there. The VAR shaft from the knob back to that flex connector is a

I assume that the character display works correctly even when the stored signal has no or a low vertical deflection. I think you will find the problem around U1620A or U2 on schematic 34. If reseating

After a warmup time of approx 2 hours the stored signal is displayed in the stored mode but only with an ampltude of 35% of the applied signal. Gerhard

I find references to 2465s within a range of serial numbers having a "higher than normal" IC failure rate, but have been unable to find which serial numbers. Please point me in the right direction.

I swapped the RAM Board and now the 2nd 7854 has the opt 2D. The 1st 7854 has still the problem, that it doesn't display the stored signal in the store mode, it shows only a horizontal line. Where can

I'm looking for same item Paul K0UYA

Items gone, thanks for all your responses. Keith

Just picked up a 466 over the weekend. Works fine, but the only problem was the Var knob on CH 2 is broken. Opened it up and saw it was the coupler that connects the two shafts that's broken. Is there

It is the same basic oscilloscope as a 2430, 2430A, 2432, and 2440. They pretty much all only differ in bandwidth and sample rate. The 2431L is a little different being a cost reduced version that

Do you have a copy of the service manual? It has detailed disassembly instructions in the maintenance section. A good copy is here http://w140.com/tekwiki/wiki/455 What does the +32 volt unregulated

Hi, My 455 that has performed perfectly for 18 years has developed a problem with the horizontal sweep. It appears to be a bit compressed on both sides and behaves like there is some oscillation on

I finally tracked down a shorted 2.7uf tant on the timebase board and got that replaced today. After putting everything together it booted up and passed all the self tests. I have it hooked up to my

I have these items for free for any longtime Tekscope member (you pay shipping): Part# 016-0083-00 Collapsible viewing hood for Types 453 and 454. One place I see it is on page 443 of the 1970 Tek

The key to this one is to understand that……by claiming to save a couple of bucks we can easily justify the repair taking 3 to 5 times as long to implement than is should….. thus turning a 1

On Sun, 17 Mar 2013, Gala Dragos wrote: I can not understand guys, WHY BOTHER? You can get DS1230 from Mouser for something like $15 (I purchased one a week ago to replace DS1225Y in my 2467B scope.)

Who got that? Anyway, thanks. I do not need another project. I do not need another project ... -- Paul Amaranth, GCIH | Rochester MI, USA Aurora Group, Inc. | Security, Systems & Software

The solution I used for my 2440 which I have discussed here a couple of times was to use the SRAM and EEPROM based NVRAMs from Cypress which as far as I have been able to tell in this case, can be

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You could add extra logic and a counter to switch between fram chips and increase the mtbf time, or even better make your own NVRAM. Oh, and if you keep the fram at 25?degrees?Celsius?you will