Epson AcuLaser C1900 Reference Manual page 306

The error clears automatically after you replace the unit and close
all printer covers. The transfer unit service life counter is reset
automatically.
Replace Waste T Box
The waste toner collector is full of toner. Replace it with a new
waste toner collector. See "Replacing the waste toner collector"
on page 251.
The error clears itself after you have replaced the waste toner
collector and close the front cover.
Reserve Job Canceled
The printer cannot store the data of your print job using the
Reserve Job function. The maximum number of print jobs stored
in the printer's Hard Disk Drive has been reached, or the drive
has no more memory available to store a new job. To store a new
print job, delete a previously stored job. Also, if you have any
Confidential Jobs stored, printing those jobs will make more
memory available.
To clear this error, select Clear Warning from the control panel's
Reset Menu. See "How to access the control panel menus" on page
199 for instructions.
Reset
The printer's current interface has been reset and the buffer has
been cleared. However, other interfaces are still active and retain
their settings and data.
Reset All
All printer settings have been reset to the default configuration,
or to the last settings that were saved.
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Troubleshooting