HP 21 repair

[surgdog]

Just found my college calculator from 1975 which has been in the attic for over 10 years fortunately with the battery pack out of it.

I followed the instructions here to remove old batteries and replaced first with alkaline then with rechargeable batteries. With the alkaline I did get the LEDs to light up after awhile but no function of the cal. Nothing happened with the Niad batteries.

I took the device apart and found that a piece of foam that was between the two PCB had corroded and when I removed it found several traces damaged on the PCB's.

Is there anything to be done or do I just write it off? Is this repairable?

I really like this calculator and have an attachment to it especially now that I have found it again.

Any advice is appreciated.

Thanks,

mk