HP LaserJet 1100 - Page 141

EN Troubleshooting/Maintenance
: Functional checks
141
Drum rotation functional check
The photosensitive drum, located in the toner cartridge, must rotate for the print
process to work. The photosensitive drum receives its drive from the main drive
assembly. To verify that the drum is rotating:
1
Open the printer door.
2
Remove the toner cartridge.
3
Mark the drive gear on the cartridge with a felt-tipped marker. Note the position of
the mark.
4
Install the toner cartridge and close the printer door. The start-up sequence
should rotate the drum enough to move the mark.
5
Open the printer and inspect the gear that was marked in step 3. Verify that the
mark moved.
If the mark did not move, inspect the main drive assembly to make sure that it is
meshing with the toner cartridge gears. If the drive gears appear functional and the
drum does not move, replace the toner cartridge.
Note
This test is especially important if refilled toner cartridges have been used.
Heating element check
Paper passes between the heating element and a soft pressure roller to fuse toner to
the paper. To verify that the heating element is functioning correctly:
1
Unplug the HP LaserJet 1100 for at least ten minutes.
2
Verify that the thermistor connector (Figure 5-3) is seated into both the printer
chassis and the ECU (for printer disassembly instructions, see Chapter 4,
"Removal and replacement."