For 2 days last week, my 76-key Tyros5 decided to re-invent itself as a 49-key arranger.
On boot up, it only sounded the keys from C2 to C6 (the 49 keys on a standard 49-note keyboard) - all keys below and above this remained silent. Numerous attempts at factory/system resets and reinstalling the latest firmware failed to resolve the issue.
When I ran the 'Keyboard type check' in the on-board test diagnostics program, instead of reporting something like 'OK (FSX76)', it reported 'NG (FS49)'. Presumably Yamaha uses a common keyboard eBus for a variety of keyboards and it is supposed to automatically detect the correct type of keyboard in use.
So, it is thinking it is a 49-note keyboard. I found this also affected my installed expansion memory packs - it failed to locate them. When I checked using YEM on my PC, the '49-key' Tyros now appeared as a new keyboard in addition to my normal 76-key Tyros. Expansion packs intended specifically for a 76-key Tyros could not be assigned to it, neither could commercial expansion packs linked to my original instrument definition file. In fact, my '49-key' Tyros now generated a different instrument definition file than it did when it was a '76-key' Tyros.
So, it had truly re-defined itself as a 'new' 49-note keyboard (all other functions on the keyboard performed normally).
2 days later, it decided it had had enough of being a 49-note keyboard, and booted up normally in 76-key mode. It has behaved properly ever since.
Has anyone else experienced anything like this on any other Yamaha keyboard, or can anyone offer some sort of technical explanation for this 'temporary' malfunction?
Regards
Roy