Hi,
I had a similar thing happen.
Definitely change the internal battery and initialize back to factory settings. Just hold down the red initialize button (top right hand corner) while you turn it on. It will then ask on the LCD - hit "yes".
I also had to change the battery in my external cartridge (if you have one).
There are some great (free & pay for) sound patches on the web for the CZ1 (way better than the presets) you can load them in via midi sysex.
The synth MAY have a backup battery which has depleted and has lost the settings. The audio does not go through the key contacts. The contaacts trigger the sound generators digitally so scratchyness is not from the contacts.
If you find the battery, you will need to do a factory reset to restore the original parameters and operation. This may involve doing a SYSEX MIDI data transfer from a backup file.
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