Electronics > Repair
Tektronix DM501A repair
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David Hess:
I have had good results restoring the switches with 801B, but the switch needs to be worked after applying it, and perhaps flushed out with more 801B.  Whatever you use, the switch *must* always be lubricated to prevent galling damage to the contacts.

It is not too difficult to disassemble the switches to access and clean the elements directly, but it is a lot more work and I did not find that it worked any better.
BlownUpCapacitor:
I don't understand why the clock signal issue has something to do with the switches. As far as I can tell, one is the attenuator/range switches, and the other is the mode that connects different circuits for different functions.

Also, for cleaning these switches, I would take out the entire plunger of the switch and clean the inside of the switch with a cotton swab, like cleaning the muzzle of a cannon with a sponge. I use a damp cotton swap soaked with deoxit. I do the same with the switch contacts in the actual plunger. Use a cotton swap to rub the contact surfaces. Ensure you let the switch dry thoroughly before reassembling as leakage may become an issue. In my Tek 5CT1N, I cleaned the x10 switch, and the HV danger light would always be on due to the 200v leaking through some small leakage paths.
Rax:

--- Quote from: David Hess on June 01, 2024, 08:37:23 am ---Whatever you use, the switch *must* always be lubricated to prevent galling damage to the contacts.

--- End quote ---

So just to confirm, your lubricant of choice is the MG 801B, right? Not a grease or something similar you apply to satisfy this requirement, is that correct?
Rax:

--- Quote from: BlownUpCapacitor on June 01, 2024, 05:17:24 pm ---I don't understand why the clock signal issue has something to do with the switches.

--- End quote ---

I can't imagine it does, but before looking at anything "electronic" again, I'll make sure to address all mechanical issues to a satisfactory level. I think that just makes sense.
David Hess:

--- Quote from: Rax on June 01, 2024, 05:31:26 pm ---
--- Quote from: David Hess on June 01, 2024, 08:37:23 am ---Whatever you use, the switch *must* always be lubricated to prevent galling damage to the contacts.
--- End quote ---

So just to confirm, your lubricant of choice is the MG 801B, right? Not a grease or something similar you apply to satisfy this requirement, is that correct?
--- End quote ---

Yes, that is correct.  Originally I did what BlownUpCapacitor suggests; I removed the plunger and used a cotton swab to clean the inside, and then applied a white lithium grease.  However later I decided that just dripping MG 801B into the switch and operating it was easier and worked better.
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