HP22S right column of keys dead

[Didier Lachieze]

Just below the display there is a foam pressing the keyboard flex PCB contacts onto the main board. Overtime this foam ages and doesn’t press enough to keep good contacts. You can check that this is the issue on your 22S if you can get the right column keys to work by applying some pressure under the display.

The fix, after opening the calculator, is to replace the aging foam with a new one.

Original grey foam:



New foam:





Detailed repair instructions (in French) here.