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I have two Tektronix scopes: a 485 and a 2465. Both of them need a little TLC, but I'm going to focus on the 485 at the moment as it is non-functional. I'm not an experienced electronics tech, but I'm

Tektronix had propensity to use chip IC sockets. Try to remove display package and reseat it. That might re-establish pin connection. Sometimes it takes several re-seatings to clear the socket.

Um... that's a model 824S counter. Dave -=-=-=- Anybody have the user guide for this counter? (Leader user guides always include the schematic.) Thanks, Dave

Common problem - FND357 displays go bad - fixed mine with two new LED displays. 6 bucks each, do a google search to see who might have them cheap. Cheers, Taylor

Anybody have the user guide for this counter? (Leader user guides always include the schematic.) Thanks, Dave

I agree with what Don posted. The 640 ohms is just the resistance of the inner conductor of the coaxial cable for a x1 oscilloscope probe. I measured about 250 ohms on a x1 probe I happen to have in

Going by the schematic, the display digits are multiplexed which is the common configuration so if the middle horizontal segment is working on at least some digits, then the 7 segment display driver

Yeah. It doesn't have any markings on it other than the name "Fairchild" on the cable, and I am glad I checked it before I actually tried to test it. In looking at an old but classic oscilloscope book

More than likely the LED read outs. Chris VK4CVL

Anyone familiar with the TM500 counter, model DC504 ? I just picked one up & I noticed a couple of the digits are missing the middle horizontal segment. So, it displays an "8" as a "0", or a "0" as a

I think you are measuring the inner conductor resistance. This is made of resistance wire (often wound in a spiral) to damp reflections back the cable. The cable isn't terminated (the input impedance

John, A HUGE thank you on checking that and giving me your value! I was hoping the short wasn't in the main board somewhere as that doesn't look like fun to pull in the least. I just checked the

I'm wondering if it could be an RF probe.? http://n5ese.com/rfprobe1.htm <snip>

Priya, You could probably use ch3 to probe for the comparisons as a last resort on the following. I would set up identical conditions on both ch2 and ch1. then on ch 2 compare signal traces starting

You are right. It is necessary to get the lube to the shaft of the control. If that is internal to the scope, you will need to open the scope up to where you can get to the control. I have found that

I have a T912 which had tight controls on the brightness and something else (focus?). I managed to free them up a bit but they need more TLC. These pots are located back inside the scope with plastic

I assume you mean a 2445A/65A/67 and 2445B/65B/67B. I know the 24xx Digital Scopes have no such limit. I just tried using a 1.2V sine wave and was able to measure pk-pk accurately to over 200MHz.

Be careful with that! Danger, 640 Ohms!

I do not know if it applies to this type of scope. However, I have had knobs appear to be seized when in truth the knob has slid down the shaft and is binding on the back of the knob to the chassis.

4 NiCd = 5 volts. No, this is just a outside fast signal source to test the triggering ability. I test the TDs in a curve tracer ( carefully !!! ). Then follow up using a tunnel dipper. Tunnel diodes