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Message: [QUOTE="Kokotoni Will, post: 248005, member: 24029"] I've got a Roland JW-50 which, after anywhere between 30min to 2 hours' use, will usually show a "checksum error" message. At this point, the buttons often stop functioning, while the keyboard itself usually continues to work. Several variations of this fault have occurred - for example, last night, after an hour's use, the buttons stopped working, without the error message. Additionally, pressing the "Block" or "Make Song" buttons will often cause the unit to crash. I've opened up the unit, and found a ROM chip marked "JW50 1.11". Now, according to my research, the latest officially released ROM version for the JW50 is 1.02. I can't find any information about a 1.11 chip for this machine. Is it likely that the ROM chip is causing the unit to crash? Failing that, I've thought about making some DMM measurements, but not sure where to start. Can anyone here please offer some advice? [/QUOTE]