Ricoh LI-MF1 M126 Field Service Manual page 255

FRU
Printhead
LVPS/HVPS
Controller board
Black page
• Incorrect laser exposure or incorrect charging of the photoconductor causes an all black page.
Always verify the same results from a different print cartridge assembly and developer before
proceeding.
FRU
Toner electrodes (not a
FRU)
Blank pages can be caused by a defective printhead assembly, LVPS/
HVPS, or controller board.
• Printhead errors typically result in machine service errors unless there is
blockage of the beam or dust on the lens. Check the lens and opening
for blockage.
• Blank pages typically are caused by the PC roll not being properly
charged. Try a different PC kit.
• With the cartridge out, check the spring loaded contacts on the right
side for free motion. None should be ground except for #4 contact
from the front.
Unplug the machine, and check the cable continuity between the LVPS/
HVPS connector marked OPC (at CN202) and the corresponding wire
form (spring) found about 14 mm above and to the right of the transfer roll
gear.
• If there is not continuity, then call the next level of service. Try a
different toner cartridge and PC kit.
• If those fail, then replace the LVPS/HVPS, controller board, or the
printhead in that order.
Also, see "Print quality problems" in "Troubleshooting".
Check the three rearward electrodes below the toner cartridge assembly for
contamination, damage, or a short to ground. Correct as necessary.
Check continuity between the cable (DEV, TAR, and doctor blade)
connection PCN3 and on the contact tips below the toner cartridge
assembly.
• If continuity fails, then call the next level of service.
Action
Action
Service Checks
6
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