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Hi All
I have a Tek 2465 which has a small fault I am hoping to repair. This is the 'sleepy eye' power indicator on the front of the 'scope.

The power switch itself works fine; but the indicator shows the high-vis 'on' state even when power off. It's a small fault but I would like to sort it.

I have managed to find what I think is the replacement part. I had hope it was going to be straightforward to fit it to the end of the shaft running from the front panel to the switch; but having taken the outer 'sleeve' of the 'scope off, it looks like there is going to be more work to get access than I thought.

I have stripped this scope down before (I 'recapped' it a few years ago) but I have forgotten most of the order in which I need to do things. Any pointers as to what I should do next?

Thanks, Jon N

Actually, I'm going to reply to my own posting...

- I have realised that getting access to the power indicator is easier than I feared - just undo the Torx screws and take the front bezel off.
- It looks like the replacement part is not exactly the same as the original, and will not do the job ;-(. I'm going to give up on fixing this small fault.

Regards, Jon N

Those switches were originally made by ITT Schadow many years ago and used to be available in many styles of buttons. I’ve seen failure of the indicator several times due to the delicate plastic nature of the way it is built. Never have had to replace one in the 2465 though.

Hekimian Laboratories was known to generously use this style of ITT Schadow switches in their telecommunications test sets which can be found on ePay.

Greg

Thanks Greg - I got a replacement but the fine details of how this one operates does not exactly match that used in the 2465. As you say, the plastic construction is pretty delicate.

I will take another look but unless I find an easy source I think I am going to live with this.

Regards, Jon N

Sorry I couldn’t help more, Jon.

I have one of the Hekimian 41-01 transmission test sets here that is part of a test suite. It has 20 of those switches on it. If you decided to go the extra mile maybe someone has an old parter available but still don’t know if the switch assembly is the same as in the Tek scope. Probably not.

There is one on ePay at a ridiculous price but the photos will give you an idea as to what I am talking about. All of the indicators on the switches show black (off) & green (on).

Greg

On Sat, 29 Mar 2025, Jon Nicoll wrote:

Until recently DigiKey (?) had replacement buttons in stock. It is just that
button part that is attached to the plastic or metal driving rods that were
used in many devices with such buttons, not just Tek 24xxx. They even had it
is different "eye" colors, not just that acid yellow. I still have some red
and yellow ones somewhere in my stock.

The exact one used in 2465B and such was C&K F08010106 (Yellow) or F08010108
(Green).

BTW, they were also made square and rectangular caps, not just round.

Here is the DigiKey part number page (out of stock, but does have datasheet
with all those buttons of all types and shapes (at the end of the datasheet
which is for pushbutton SWITCHES and those buttons are at the end of it:



Once upon the time they actually had those in stock and I was able to
purchase some.

BTW, if you enter "F08010106" in Octopart search you'll find many still in
stock and they are dirt cheap -- e.g. Arrow/Verical has 160 of those in
stock as of right now for 64 cents apiece. They even have them in different
colors, Yellow, Blue, Green, ans Orange (last 2 digits 06/07/08/12).

As an afterthought, will probably go buy some more in all colors, just to
have spares...

Thanks Greg - I got a replacement but the fine details of how this one operates does not exactly match that used in the 2465. As you say, the plastic construction is pretty delicate.

I will take another look but unless I find an easy source I think I am going to live with this.

Regards, Jon N

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