HP35 Troubleshooting

[GanjaTron]

(02-11-2023 11:24 PM)teenix Wrote:  Even if the IA bus was outputting all 1's, it should look similar to the PHI buses.

A 2.2uF capacitor controls the circuitry reset at switch on, pretty sure top RHC of board, it may need replacing, say with a modern tantalum 16 - 25V.

Hi Tony,

yeah, it's that 2.2µF at upper right. Checks out ok, but I can try with an electrolytic as a quick test.

--Roland