Grease recommendations for worm gear?

[albertofenini]

I would strongly advise to follow Tony advice

On our HP67s and HP65s changing the Caps has done miracles, it has solved problems like

"motor keeps running when the card has gone thru"
"reads and writes once in a while"
"reads only one card out of all"
"writes but doesn't read back"

and we could list a few more, that apparently could have been due to mechanical issues
we usually don't lube the worm gear though this is a very good idea

Just my two cents ... take care !!

(02-09-2023 11:02 PM)teenix Wrote:  

(02-08-2023 09:56 PM)GanjaTron Wrote:  Do tantalums exhibit the same gradual recovery behaviour as electrolytics? My (albeit limited) experience is that they tend to short spontaneously -- when they don't decide to explode, that is. ;^)

Btw, one of the caps in my HP65's PSU reads 11 ohms ESR! While that doesn't sound right, I doubt it's the cause of the card reader woes. I checked the motor with my bench supply, and it's definitely a mechanical issue.

--Roland

There has been issues with the degraded PSU caps and card read errors, so I thought it may be worthwhile replacing them. Maybe the motor tantalum cap as well. Has the calculator been on for a while, or just turned on when the problem occurs?

cheers

Tony