Inductor on HP 25C board

[Geoff Quickfall]

That is a classic dead ACT display. Therefore it is hard to tell if the RAM or ROM chip are dead.

Bernhardt ACT would solve all three problems as it has self contained RAM and the ability to switch between the onboard ROM or use the calculator ROM. You can run Bernhards ACT in enhanced mode or original mode for authenticity.

I have an HP 25 that exhibited all the 0's after a full service. Replaced the ACT with a PANAMATIK flashed to HP 25E Ir (print able enhanced mode) only to discover the out gassing nicads had destroyed the ROM also. No problem, switched on power up to the new ACT ROM and never looked back.

So, yes, the 00000000000's display is definitely an PANANMATIK ACT repairable event.

The video is redone and show the very same HP 25 running the version 1.02 67E Ir in conjunction with the infrared printer.

*****Edited due to original post edit. See Berhands response on the RAM chips, that's why there are two in the 25 on the board.****

Cheers, Geoff