TA Triumph-Adler CLP 4721 - Manual (Page 161)

Troubleshooting
6-4
Faint or blurred printing Clean the LSU.
For details, refer to LSU (LSU cleaning mode setting) on page 4-88.
Make sure the paper type setting is correct the paper being used.
For details, refer to Paper Settings on page 4-29.
Conduct color calibration either by switching the printer off then on or using
the printer operation panel.
For details, refer to Color Calibration on page 4-79.
Try adjusting the color control settings using the printing system driver.
Check the operation panel. If the Toner low C,M,Y,K message is
displayed with color description, install a new toner kit for the color. To
replace toner, refer to Toner Container Replacement on page 5-2.
Refresh drum.
For details, refer to Drum (Drum/Refresh mode setting) on page 4-88.
Run [MC] and decrease the adjustment value. Decrease the adjustment
value 1 level at a time from the current value. If there is no improvement
after the value is decreased by 1 level, decrease by 1 level again. If there
is still no improvement, return the setting to the original value.
For details, refer to MC (Main charger output setting) on page 4-89.
Grey background Conduct color calibration either by switching the printer off then on or using
the printer operation panel.
For details, refer to Color Calibration on page 4-79.
Dirt on the top edge or back of the paper Check the paper chute and the ramp.
Open the rear cover and check for toner on the paper ramp inside the
paper transfer unit. Clean the paper ramp using a soft, dry, lint-free cloth.
For details, refer to Cleaning the Paper Transfer Unit on page 5-8.
Offset occures. Refresh drum.
For details, refer to Drum (Drum/Refresh mode setting) on page 4-88.
Run [MC] and decrease the adjustment value. Decrease the adjustment
value 1 level at a time from the current value. If there is no improvement
after the value is decreased by 1 level, decrease by 1 level again. If there
is still no improvement, return the setting to the original value.
For details, refer to MC (Main charger output setting) on page 4-89.
Printed Results Corrective Action