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CCD ... -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de Rich Gill Enviado el: domingo, 3 de marzo de 2019 1:37 Para: [email protected] Asunto:

Hello Jim: The extender costs are high, and some plugins need several connectors. I have fixed many TM500 modules by taking a 1-2-3-4 wide mainframe and removing all the covers. A 1 wide plugin in a

I believe this could be a characteristic of this instrument, I watched a video from YouTube CuriousMarc - Tektronix 577 repair and Demo. Carefully watching that video with the variable collector set

They are a modular pot that can be disassembled by removing a pair of micro torx screws from the back side, and popping off the back. Use something like DeOxit Fader Lube. -Chuck Harris

Thanks Chuck. It's the 2465, not A or B. Can these pots be cleaned like a traditional pot, or are they sealed?

My thanks and I got some good encouragement and experience from your post - Thanks. Bill

No, I was not using an isolation transformer (I don’t have one) and yes I was measuring between cap and chassis. I will look into getting a transformer before testing across c2202 or doing other

Hi Bill, No... There was nothing that I wrote that I think is wrong. It was a matter of timing.? I hadn't read all of the other replies, especially the one where you found the attenuator pin issue! I

Hello Again, I went back to the circuit around Q1306 and Q1308 this evening. The resistors are all within specs. C1305 was pulled and checked. It is also fine. C1304 is good and so is C1302. By the

Hi Steph, You are doing fine. I am getting all of your responses and may I add, it is much appreciated at this end. Ripley Sent from Mail for Windows 10 Sent: Sunday, March 3, 2019 7:05 PM To:

Hi Ripley, How about C1305 0.1uF. If open, gain of Q1306 (and whole oscillator loop) will be lower and perhaps not enough to maintain oscillation? (Great suggestion from Don re 1K pull up touch on

Is it an actual 2465, or the A or B model? I ask because the actual 2465 uses a very funny pot for the Delta controls. It has no stop, a conventional resistor wafer, but two separate wipers that ride

I guess you realise you're measuring in an area that is directly connected to the mains, no isolation? Take great care! *Do* use an isolation transformer and *float your 2247A*. Did you measure the 77

Thank you so much Reed for the highly detailed roadmap to follow at this point and forward. I am going to read through your post a few more times to get a clear picture before I proceed. One thing

Correcting myself: That snippet was left over editing away the erroneous mentioning of using a square wave (pulse). Please ignore. Apparently, you don't have a full short. Still, traces of lower

Decoupling caps and tants and conducting PN junctions and regular power supply current would (partially) short out your pulse, thereby hiding the current info you're looking for, *unless* you use a

I finally got a chance to take a look at this 2247a. At the test point you mentioned (c2202, before the startup and pre-regulator, marked 14A on the schematic), I’m only getting 77VDC, but got about

The -15V worries me a bit -- I've seen a shorted tantalum around 40 ohms on this rail. The character generator board has 1 uF tantalums directly across the -15V and -50V rails; try disconnecting it

Definitely good ideas, Harvey! I particularly like the idea of pulsing a current limited supply into the rail and checking around along that rail for the lowest amplitude pulse. That should get you

What ?? Now confused. Was there something wrong with your first reply? Bill