7-54 Troubleshooting
EN
Defective laser
shutter.
Check the laser shutter for free operation when
inserting the Toner Cartridge.
Toner Cartridge Guide
damaged, improperly
positioned, or missing.
Make sure the Guide is installed properly above the
Toner Cartridge.
No Transfer Roller
voltage.
Without Transfer Roller voltage, toner cannot be
attracted from the surface of the drum to the paper.
Perform the Half Self Test Functional Check (page
7-67) to check all other electrophotographic
processes. Replace the Transfer Roller if necessary.
No Developing Bias. 1. Clean the High Voltage Power Supply contacts.
With no Developing Bias charge, toner is not
attracted to the drum.
2. Replace the Engine Controller Board.
No drum ground path. With no ground path the drum cannot discharge. The
negative charge on the drum repels toner, and
leaves a white page with bubble print.
1. Check the drum ground spring and connect it as
shown on page 6-43.
2. Replace the Engine Controller Board.
Defective Laser
Scanner Cable
Assembly.
Low-level signals exchanged between the Laser
Scanner Assembly and the Engine Controller Board
may be affecting laser output. Replace the Laser
Scanner Cable Assembly.
Table 7-11. Blank Page (continued)
Possible Cause Action
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