Technical data

7.7 Extraneous Marks
c. Make sure the communication features of the printer
match those of the host system and any intermediate data
communication equipment, (modems, multiplexers, and so
on).
7.8 Light Images
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Description: The print is completely black or the overall image
density is too light or undertoned.
Troubleshooting: Print several copies of the 1948 Setup
pattern, as shown in Section 3.3. Inspect the test patterns. All
of the number 1 lines must be visible and unbroken. Perform the
following procedure to fix any defects:
1. The paper might be damp. Try some dry paper from the
center of a fresh package.
2. Make sure the rear cooling fan is operational, as shown in
Section 4.3.
3. If you find moisture on the scanner window, make sure the
rear cooling fan is operational, as shown in Section 4.3.
4. Clean or swap the transfer/separation charger.
5. Inspect the print drum ground clips. When the top door is
closed, this clip connects the metal print drum axle to the
frame of the printer.
Use an ohmmeter to measure the resistance between the
metal part of the print drum and the frame of the printer. If
the resistance is greater then 10 , replace the ground clip.
6. Perform Section 7.15, HVPSA FIP.
7. Perform Section 7.17, Developer Bias FIP.
8. Swap the following FRUs:
• Developer unit
• Print cartridge
• Scanner assembly
Image Defects FIPs 7–11