Light Prints - Xerox DOCUPRINT N17 Service Manual

7.5.9 Light Prints

Sample Image Definition
The overall image density is lighter than normal, or extremely light.
PRINTER
PRINTER
Initial Action
Ensure that the print density is set to the default value (3). Execute Diagnostic Mode 3, Print Density.
Procedure
1 Replace the paper in the paper tray. Problem solved.
Y: Use new paper (and ask the customer to keep paper stock in a dry place).
N: Go to step 2.
2 Inspect the Drum ground path shown below. The printer is grounded all through the ground path.
• Drum > Drum shaft pin > Plate Earth > HVPS > LVPS.
Y: Go to step 3.
N: Complete the Drum ground path.
3 Check the laser beam path from the Drum to the Laser Assembly for contamination or obstacle.
The laser beam path is contaminated or obstructed.
Y: Remove the contamination or obstacles.
N: Go to step 4.
4 The HVPS DB (DC) has faulty output voltage. Refer to 5.2.1.23 HVPS (Developer Bias AC)
Operation .
Y: Go to RAP 7.4.24 HVPS Failure.
N: Go to step 5.
5 The Bias Transfer Roll (BTR) Assembly is contaminated.
Y: Replace the BTR Assembly.
N: Go to step 6.
6 Generate a test print and switch OFF the printer in the middle of the print cycle. Inspect the toner
image on the Drum surface. A complete toner image shows on the drum surface.
Y: Go to RAP 7.4.24 HVPS Failure, and check if the BTR output is normal.
N: Install a new EP Cartridge.
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7-95 Repair Analysis Procedures (RAPs)