NP-41 Emulator (may be)

[Chris Chung]

(12-21-2017 07:21 AM)Massimo Gnerucci Wrote:  

(12-21-2017 04:25 AM)Chris Chung Wrote:  Key need force to register is more likely a hardware problem. Firmware update may not fix it. Could try rework the solder joint. Can test by jumping a piece of wire between the two ends of the button. A paper clip also works.

You may want to try loading ROM or new firmware. I am also interested in learning how a firmware update goes in one of the units.

Yes, sorry, I was not implying that a firmware update could resolve hardware issues...
And, please!, keep me away from a soldering iron.
I was only asking if you suggest to proceed with firmware upgrade if this could solve other problems.
So thank you: I will try to update it in the next days and keep you posted.

The only addition on the newer firmware is having "clear ROM spaces" in the cold-start screen. I.e. hold down TAN key while inserting battery. Not sure how useful, but it could help for those units that got locked-up at MEMORY LOST.

Use bootloader to replace firmware would be something I would try 1st to rescue locked up units.

Key registering and display no show issues would most likely be hardware related.

Did you try to use a metal paper clip or similar method to test the problematic key? Are you going to get a "solder-man" to help you out? If it's confirmed (i.e. paper clip works), a re-solder would be the next step. If that doesn't solve the problem, it may be a bad button anyway, I can mail you spare buttons for repair. Or I can swap your unit w/ another one (need to give me time).