Author Topic: Tektronix TAS 485 - bad menu button, flex PCB (photo)  (Read 154 times)

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Offline beowulfenator

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Tektronix TAS 485 - bad menu button, flex PCB (photo)
« on: July 12, 2018, 06:23:54 pm »
Hi!

I just got a used Tektronix unit and it turns out one of the menu buttons is not working. Apparently the traces on the flex PCB have been rubbed off!

Is there a good way to repair this flex PCB?

Thanks!
 

Online wraper

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Re: Tektronix TAS 485 - bad menu button, flex PCB (photo)
« Reply #1 on: July 12, 2018, 06:40:42 pm »
Try to replace destroyed carbon traces with conductive glue.
 

Offline philpem

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Re: Tektronix TAS 485 - bad menu button, flex PCB (photo)
« Reply #2 on: July 12, 2018, 10:15:43 pm »
Mask with Kapton tape to form the track pattern, then paint over with silver paint (the stuff used for repairing flex-PCBs and TV remotes).

When it's dry, remove the tape, apply fresh tape for the pattern on the other side and repeat the painting.

Keep the layer thin so it doesn't impede the button, but not so thin that there's almost nothing there. A glue spreader used as a squeegee might help (with that technique, the kapton tape will set the layer thickness).
Phil / M0OFX -- Electronics/Software Engineer
"Why do I have a room full of test gear? Why, it saves on the heating bill!"
 
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Offline beowulfenator

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Re: Tektronix TAS 485 - bad menu button, flex PCB (photo)
« Reply #3 on: July 13, 2018, 03:45:58 am »
Any recommendations to the specific brand of silver paint/glue?
 


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