Kurzweil PC88mx freezing

[LeoBoston]

I got a used Kurzweil PC88mx with multiple broken keys. I was able to fix them, and now it works fine except for one issue. It is freezing up from time to time sporadically - no sound and does not respond to any controls. The power off/on returns it to normal. I would appreciate any relevant advice.

Thank you,
Leo

 

[happyrat1]

Try refreshing the firmware.

 

[LeoBoston]

Thanks! I will research how to do that. I am not a profi Can you point me in the right direction?

I first thought about a bad cap considering they are 25+ years old. I opened the instrument hoping to see bulging, etc. but I did not find anything obvious and decided to ask in the forum hoping someone had this exact issue. Desoldering all caps might do more harm. If I decide to keep the keyboard for myself, it is not a big issue as the lock-ups happen not even every day. I will try the firmware if I find it.

 

[happyrat1]

I got a used Kurzweil PC88mx with multiple broken keys. I was able to fix them, and now it works fine except for one issue. It is freezing up from time to time sporadically - no sound and does not respond to any controls. The power off/on returns it to normal. I would appreciate any relevant advice.

Thank you,
Leo

Get an ESR meter. See YouTube for instructions

 

[LeoBoston]

I have one, a Signstek MESR-100 V2. I was not able to find the firmware :-(

 

[happyrat1]

Ask here https://forums.godlike.com.au/ for the firmware.