Canon PC-D320, Service Manual

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PC-D320/PC-D340/FAX-L400 Chapter 4: Maintenance and Service
4-30
• Light
Solutions:
(1) Remove the toner cartridge and shake it lightly five or six times.
(2) Verify that user data “COMMON SETTING” “TONER SAVER
MODE” is not “ON”.
(3) Replace the toner cartridge.
(4) Open the right cover during printing, and remove the toner cartridge.
Open the cartridge drum cover shutter manually, and check whether
the toner image on the photosensitive drum is transferred onto the
paper. If it is transferred, go to item (7). If not, go the following step.
(5) Clean the transfer bias contact and the transfer charging roller shaft
contact.
(6) Replace the transfer charging roller.
(7) Clean the developing bias contact and the toner cartridge contact.
(8) Replace the ECNT board.
(9) Replace the SCNT board.
• Dark
Solutions:
(1) Verify that user data “COMMON SETTING” “TONER SAVER
MODE” is not “OFF”.
(2) Clean the drum ground contact and the toner cartridge contact
(3) Clean the primary charging contact and the toner cartridge contact.
(4) Replace the ECNT board.
(5) Replace the SCNT board.
• Completely blank
Solutions:
(1) Clean the developing bias contact and the toner cartridge contact.
(2) Check whether the projection for opening and closing the Laser
shutter on the toner cartridge is damaged.
(3) Replace the Laser shutter lever or the Laser shutter.
(4) Replace the Laser/Scanner unit.
(5) Replace the ECNT board.
(6) Replace the SCNT board.
• All black
Solutions:
(1) Replace the toner cartridge.
(2) Clean the primary charging contact and the toner cartridge contact.
(3) Replace the ECNT board.
(4) Replace the SCNT board.