How to Remove Tektronix 2400 Series Scope Handle? (Fixing power button) - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: May 31, 2014, 05:20:57 am
content: If rather than adjusting the handle on a Tektronix 2400 series scope you wanted to remove it, how would you do that? Thanks

author: David Hess
author_rank: Super Contributor
timestamp: May 31, 2014, 12:52:22 pm
content: If you remove the cover, then there is a single screw on each side on the inside holding the handle together.

author: Electro Fan
author_rank: Super Contributor
timestamp: May 31, 2014, 05:26:01 pm
content: David, thanks - I've looked around here and other places; I'm sure the answer is out there but where are the screws/what is the process for removing the cover? Thx again, EFPS, any chance you have any thoughts on how to fix a slightly stuck power button?Initially the unit (2467B) powered on with the yellow indicator displaying inside the power button; when I went to turn the unit off the power switch clicked but it didn't turn off the unit. I found I could gently pull the power button out and that turns the unit off. When I turn it back on with a depress of the power button the unit powers up and the yellow indicator displays (about 95%, it looks like the top of the yellow indicator doesn't completely reveal itself). To turn it off requires a depress of the power button followed by a gentle pullout of the power button. Whatever is keeping the yellow indicator from fully displaying during power up seems to be keeping the button from turning off normally (without the manual button pull on power down). Might be a failed/failing power button - maybe something is just stuck inside? Or maybe a spring or other part is fatigued? Or maybe it just needs the right type of lubricant? Thx

author: Electro Fan
author_rank: Super Contributor
timestamp: May 31, 2014, 09:11:02 pm
content: Maybe the problem might be the spring part 106 shown in the service manual: 214-3328-00 ?Any idea about how hard it would be to get to that area inside the scope and replace the part? (assuming the part could be found)?ThanksPart Number : 214-3328-00Manufacturer : tektronix incNSN Number : 5360013081567FSC 5360 Coil Flat and Wire Springs

author: David Hess
author_rank: Super Contributor
timestamp: June 01, 2014, 05:15:59 am
content: Going by my 2440, there are four screws on that back that hold the rear panel with the feet on. Once those and the panel are removed, the outside cover with the handles attached will slide back from the chassis of the oscilloscope. Then the inside of the handles where the two screws are may be accessed.These oscilloscopes support rack mounting so there are instructions for removing the handle in order to add the rack mounting kit.As far as the power switch, I believe its operating rod and switch are completely accessible from the bottom of the oscilloscope once the cover is removed. Squirting some contact cleaner/lubricant into the switch will probably fix it.

author: Electro Fan
author_rank: Super Contributor
timestamp: June 01, 2014, 05:51:33 pm
content: David, all very helpful (and encouraging). I will give it a go. Thanks! EF

author: Electro Fan
author_rank: Super Contributor
timestamp: June 02, 2014, 04:37:10 am
content: David, thanks.Turns out there are 4 screws on the back corners (recessed in the rubber feet) plus 2 torx T15 screws in the center of the back plate cover. Removing those 6 screws lets the cover slide off (which would enable the removal of the handle as you said).Once the cover is off there is a black plastic push rod that runs the length of the bottom front to back; it is completely accessible. The power button on the front panel that drives the push rod is only partially accessible - you can see the spring but not the full push button part.The back of the push rod connects to a foot-like part that goes 90 degrees into a hole through the circuit board (it probably drives some sort of switch on the power supply).The whole mechanism is a bit sensitive/close in tolerances and if the cover is out of square or too tightly screwed down it can impede the mechanism.Long story short the power button is now working (knock on wood). Thanks again, EF

author: David Hess
author_rank: Super Contributor
timestamp: June 02, 2014, 12:29:26 pm
content: Well, at least it was close enough. All of the 22xx and 24xx series disassemble in roughly the same way. On the 2440 series, the entire power switch and mechanism is accessible from the bottom.