Restoring a HP9830B calculator.

[MattisLind]

The extenders have arrived:



I also have spent some time cleaning the HP9810A. It was really dusty. Then I slowly applied AC through a variac and checked the PSU. It was in good shape. But that was it with the 9810. It was dead when all cards were seated and it wasn't the PSU that couldn't handle full load; all voltages measured OK when cards were seated. Testing the CPU cards in the HP9830 revealed that the data path card and the clock card was BAD. The other two seemed to work. Switching in the HP9830 known good boards didn't help much. The only difference was that the STATUS lamp turned on after a while. So there are multiple problems.

But it is very good to have the running HP9830 when fixing these two boards.

Now its time to clean the HP9866 printer which I brought home from storage.