Epson AcuLaser C1900 Reference Manual page 305

PS3 Hard Disk full
The memory allocated for writing PostScript 3 commands on the
optional Hard Disk Drive is full.
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.
RAM Check
The printer is checking the RAM.
Ready
The printer is ready to receive data and print.
Replace Toner X
The developer cartridge to be replaced has been moved to the
replacement position in the printer.
Replace Photocondctr
The photoconductor unit has reached the end of its service life.
Replace the photoconductor unit with a a new one. See
"Photoconductor Unit" on page 246 for instructions.
The error clears automatically after you replace the unit and close
all printer covers. The photoconductor service life counter is reset
automatically.
Replace TransferUnit
The transfer unit has reached the end of its service life. Replace
the transfer unit with a new one. See "Transfer Unit" on page 253
for instructions.
Troubleshooting
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