02/2000
3-3
DocuPrint N2125
Introduction, Measurements
Image Quality Repair Analysis Procedures
Initial Issue
Introduction
This section contains image quality repair procedures to assist in correcting image quality
defects. These procedures provide defect samples, definitions and specifications to help iden-
tify the type of defect that exists, the test pattern to use, and actions required to correct the
defects.
The voltage tolerances for this section are listed in
Table 1
under the topic
.
Throughout these procedures, the term “vertical” refers to the process direction (the direction
paper travels through the printer); the term “horizontal” refers to the scanning direction (the
direction the laser beam scans across the page).
Cleaning procedures should always be performed before beginning any Print Quality Repair
procedure.
Be sure that the paper meets printer specifications. Changing the paper, or using paper from a
previously unopened ream, will resolve many print quality issues.
After resolving an image quality problem, return to Image Quality Checkout to verify that no
other image quality defects exist.
Sample reproductions of the various image quality patterns are included under Image Quality
Specifications.
Use the Image Quality RAPS to further diagnose machine problems.
In the Y/N (Yes/No) steps of the RAPs, a Yes response will lead you to the next step. A No
response will indicate a corrective action, or will direct you to another step. When the indicated
corrective action has been completed, go to Section 1 and restart the Initial Actions to verify
that the problem has been corrected.
Measurements
Power and signal grounds are connected to frame ground, therefore all circuit troubleshooting
can be performed using the metal frame (chassis) as the grounding point. If more information is
needed to locate connectors or test points, refer to section 7.
Unless specified otherwise, the following voltage tolerances are used within this section:
Table 1 Voltage Measurements
Stated
Measured
+ 5.0 VDC
+ 4.8 VDC to + 5.2 VDC
+ 3.3 VDC
+ 3.0 VDC to + 3.6 VDC
+ 24.0 VDC
+ 21.6 VDC to + 26.4 VDC
0.0 VDC
less than + 0.5 VDC
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Содержание N2125N - DocuPrint B/W Laser Printer
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