Switch off the printer, the scanner, and the PC, and then disconnect them from
the power source prior to performing any maintenance.
HP Designjet T1100 MFP, 4500mfp, 4500 Scanner, 820 MFP Service Manual
1. Open the Guide Plate.
2. Remove two T20 screws along the lower
edge of the Top Cover.
3. Pull the front part of the Top Cover away
from the Scanner in order to release the
upper part of the Top Cover.
Removal and Installation