FUJITSU DL3750+/3850+ - Manual (Page 147)

Maintenance
User's Manual 6-7
MAINTENANCE
Head lock wire
REPLACING THE PRINT
HEAD The print head is easy to replace.
CAUTION
The print head may be hot if you have been printing recently.
To remove the print head:
1. Turn off the printer.
2. Open the front cover of the printer and remove the ribbon cartridge.
3. Pull the right end of the head lock wire forward to release it from the
hook at the right of the print head carriage. Then release the wire
from the center hook.
4. Remove the print head from the connector on the carriage, as shown
in the figure below.
Replacing the print head