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Hi, is this the board you refer to: /g/TekScopes/photo/259372/0?p=Created,,,20,2,0,0 where is that board located? what number of board is it?

I've cleaned and adjusted these - and they are a pain. To clean the pads on the PCB, you'll need to remove the switch assembly (follow instructions carefully), and use pure isopropyl alcohol for

Roger, I figured out that those were the connections I swapped to get the left to right beam. I took a picture of the signals :

I was going to make the same request, but not to own it, just to scan it for TekWiki. There are some manuals there already (https://w140.com/tekwiki/wiki/2236) but not sure if they include the one

Jose, If you look at Schematic <11> Horizontal Amplifier in the manual you will see the connections to the Right hand and Left Hand deflection plates at the extreme right hand side of the

Hi, It is standard practice to reset the power cycle counter, and the hours counter when a scope is calibrated. The purpose of the counter is to give the calibration technician some idea of how long

Morning All! I had a 2445. As far as I was concerned, it was clumsy for what I do. I service antique radios and comm gear. You have to play games with the 2445 to get an actual freq readout and

Roger, is it the IN test point located near the end of sweep board as suggested by paragraph 28 (p5-13) of calibration process ? Jose

Where am I supposed to connect the probes of second scope ? Are there some TP available on the boards ? Thx!

Hello unclear what you say re dc feed thru Suggest that you post images of the symptoms and control settings. Beside the CAL Signal use an external RF generator to test. Beware of overloading the

Reijek, bonjour the Elastomeric switches are the most delicate and finicky to fix. Deoxit is normally fine for contacts BUT use of ANYTHING not in the official Tektronix proceedure is risky and

Jose, I believe you have another scope available. Can you leave the 485 in X-Y mode and measure the two X deflection plates in turn? The important question is what is the approximate frequency of

Hello Ozan Tried to do what you ask me. I uploaded the pictures of : - Sine wave + A-Gate in chop mode : https://drive.google.com/file/d/1CaLwPUbmhFsh9ROAMuvs79wGpUXSmQk4 - A-Gate + A-Sweep on the 485

Hi Roger, I did the quick X-Y test and instead , I get a short ~0.5 div horizontal line. Rgds José

Oops! My bad. Momentary dyslexia or something like that. I misread the original message as 2336 instead of 2236. It is a 2336-YA manual that I found on eBay. Sorry for the mistake. Steve H

Jose, I think there is another clue in your picture. As Jeff says the vertical bar on the left of the display is the beam spot before the sweep starts, but it is not just a narrow vertical line, it

Tom, No, it most certainly was not. A fully optioned Chevy Caprice Classic cost half as much as 485 around that same time. It's fascinating, however, that the 2465, which has many of the same

That's quite a leap from the 2235 to the 2236. Yeah, I think it'd be a fair guess as to why the 2235 is literally available by the pallet on eBay today, and the 2236 not so much. Any chance of taking

I have just confirmed operation on my TM5006. As Ed mentions, during the voltage tests, the measured voltages are lower than the TM500 mainframe values in the tables in the manual. The transistor

Thanks for looking up the prices and putting all the data in one easy-to-find place, Jeff. It’s fun to see, for example, that the 485 cost the equivalent of $20k today. It was evidently not