Brother GTX-4 Instruction Manual page 238

"x" is displayed for the remaining ink level after replacing the ink pouch
Probable Cause
Is a wrong color of an ink pouch installed?
Remaining volume indication of the ink pouch does not reflect the actual status
Probable Cause
Didn't you replace an ink pouch in the way of use?
Put an ink pouch in its correct position. If colors are mixed on the
print result or within the ink pouch, please contact your dealer.
If you take out an ink pouch that still has much amount of
remaining ink in the way of use, then set a different ink pouch or
the original used ink pouch back to the printer, it can indicate a
different volume from the actual remaining volume. If you keep on
using it and the volume is reduced to some extent, the correct
remaining volume will be displayed again.
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Troubleshooting
Remedy
Remedy