7-68 Troubleshooting
EN
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 whether the drum is
rotating:
1. Open the top cover.
2. Remove the Toner Cartridge.
3. Mark the cartridge’s drive gear with a felt-tipped marker. Note the
position of the mark.
4. Install the Toner Cartridge and close the top cover. The start-up
sequence should rotate the drum enough to move the marked
gear.
5. Open the printer and inspect the marked gear. Verify that the
mark moved. If the gear did not move, inspect the Main Drive
assembly to ensure that it is meshing with the Toner Cartridge
gears. If the drive gears function and the drum does not move,
replace the Toner Cartridge.
Note This test is especially important if refilled Toner Cartridges are in use.
High Voltage Power Supply Functional Check
The High voltage Power Supply Assembly provides the necessary
voltages for the printer’s electrophotographic processes. The +24B
VDC supply is used to power the High voltage Power Supply
Assembly. A summary of the major components of the high voltage
system is given in Table 7-32.
Table 7-32. High Voltage System Checks
Checks Action
Are the connectors for the Primary Charge
roller, Drum Ground, Developing Bias, and
Toner Level Sensor damaged, corroded, dirty,
or missing?
1. Inspect and correct each item.
2. Check the Toner Cartridge.
3. Check all wire connections.
4. Replace the Engine Controller Board if the
connection cannot be repaired.
Are the High Voltage Power Supply
connections dirty, bent or broken?
1. Clean the terminals with alcohol only.
2. Check all wire connections.
3. Replace the Engine Controller Board if the
connection cannot be repaired.
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