Black Prints - Xerox DOCUPRINT N17 Service Manual

7.5.5 Black Prints

Sample Image Definition
The entire print is black.
Initial Actions
• Ensure that print density (see Section 5.2.3 Diagnostic Mode 3 for more information) is set to
default (3).
• Generate the System Controller Test Print, Section 5.1.4.13 Print Menu , and Print Engine
Controller Test Print, 5.2.2 Diagnostic Mode 2 .
• If both prints are completely black, replace the EP Cartridge.
• If any image is visible on the prints, go to RAP 7.5.18 Background.
Procedure
1 Only the System Controller Test Print is black.
Y: Check the seating of the System Controller. If OK replace the System Controller.
N: Go to step 2.
2 Cover the Laser Assembly window (laser beam outlet) using a piece of paper, and generate a
test print. The entire print is still black.
Y: Go to RAP 7.4.24 HVPS Failure.
N: Go to step 3.
3 Cover half of the Laser Assembly window (laser beam outlet) using a piece of paper, and
generate a test print. The print is black only in the area not covered with the paper.
Y: Go to RAP 7.3.2 "Laser Fail - Power Off/On" Message (U2).
N: Go to step 4.
4 The HVPS has faulty output. Refer to REP 5.2.1.21 HVPS (Charge Roll DC) Operation and
perform diagnostic.
Y: Go to RAP 7.4.24 HVPS Failure.
N: Install a new EP Cartridge.
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7-91 Repair Analysis Procedures (RAPs)