If you buy a second hand, it may have been damaged in mini switch (tact switch)
under the
WRITE button. You need to replace the tact switch. Easy and inexpensive, you can do yourself, only with a little knowledge of soldering
.
Tact Switch:
You may also try the FACTORY RESET.
Restoring the GT-10 to the settings made at the factory is referred to as a "Factory Reset."
Not only can you return all of the settings to the values in effect when the GT-10 was shipped from the factory, you can also specify the range of settings to be reset.
If you do this"Factory Reset", all the setting on user memory (that you create) will be erased, so
backup your setting before doing this steps.
For more detail on "Factory Reset", read the GT10 user manual:
roland.com/support/article/?q=manuals&p=GT-10&id=1810803