HP Agilent E4418B Power Meter keypad flex circuit E4418-20007 needed

[Ordinaryman1971]

Hi guys, i need an HP Agilent E4418B Power Meter keypad flex circuit E4418-20007
Mine stopped working.

[kada]

Hello,
I also need this one.
My flex keypad stopped working too.
The new part number is E4418-66502 (taken from Keysight site).

[kada]

After receiving $183 quote from Keysight for flex keypad I definitely decided to do it myself.

First of all I bought the thinnest push-buttons I was able to find. It is only 0.8mm thin.


I decided to mill 1.5mm PCB on my CNC-engraver and after it to reduce thickness down to 0.7mm by back side milling.
PCB Milling

Results:


I also glued rubber circles taken from old remote controller to rubber keypad pushers for better force transfer to push-buttons.



I was not satisfied with result since after keyboard assembly some push-button was pressed and did not released due to the increased length of rubber keypad pushers and push-buttons thickness.
So I decided to cut pushers of rubber keypad and re-glue the rubber circles.



Now all keys works excellent with little more pressing force comparing to original keyboard.
In addition there is a tactile effect which improved ergonomics of the keyboard.

I also included Altium Designer 15 project of the PCB for those who decide to do it.