Service manual

216 Troubleshooting ENWW
White or missing
image/blank page
No toner is available for print. ● Remove sealing tape or replace the print
cartridge. Look for the REPLACE CARTRIDGE
message on the control panel display.
Defective laser shutter.
● Check that the laser shutter operates freely
when the print cartridge is installed.
Toner cartridge guide damaged, incorrectly
positioned, or missing.
● Make sure the guide is installed correctly above
the print cartridge.
No transfer roller voltage.
● Without transfer roller voltage, toner cannot be
attracted from the surface of the drum to the
print media. Perform the half-self-test functional
check to check all other electrophotographic
processes. See “Half-self-test functional check”
on page 227. Replace the transfer roller if
necessary.
No developing bias.
● Clean the high-voltage power supply contacts.
With no developing bias charge, toner is not
attracted to the drum.
● Replace the power supply.
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.
● Check the drum ground spring and reconnect it,
if necessary.
● Replace the power supply PCB.
Defective laser scanner cable assembly.
● Low-level signals exchanged between the laser/
scanner assembly and the engine controller
PCB might be affecting laser output. Replace
the laser/scanner cable assembly.
Table 24. Image defects (continued)
Problem Cause Solution