Sad day for HP-41C

[Dave Frederickson]

(12-15-2017 10:41 PM)Benoit Maag Wrote:  José,
There seems to be 2 types of deoxit: ‘contact cleaner’ and ‘electronic cleaner’
Which one would you recommend?

(12-15-2017 08:13 AM)Jose Gonzalez Divasson Wrote:  Clean it with Caig DeOxit and cotton buds and flat screwdrivers in the worst places. You will be astounded as the crud goes away very easily. I have recovered many units that looked even worse, and now they are CL too.

There are some drop-in solutions for the battery-port module. No assembly required.

You can start with the cleaning and then if you feel confident you can buy the battery-port module.

Best regards,
José

There are more than two types, but the most common are the "D" formulation which is a cleaner that removes corrosion and a "G" formulation that is a contact enhancer and preservative. Both come in 100% and 5% concentrations, in liquid and aerosol. Contrary to popular belief, the "G" formulation is not just for gold. Both formulations work on all kinds of metals.

So what you want is the D100 to remove the blue crud.

Dave