Identifying The Banding Type - HP Indigo press 3050 Troubleshooting Manual

Identifying the banding type

1. Print 5 copies of the following banding diagnostic jobs:
Print job
TS_Gray20
TS_Banding2
TS_Registration 4 pix
2. Throw away the 1
3. Inspect copies from 2
1. Arrange the 4 copies of each job side by side on a large surface.
2. Mark major banding on each print sample.
4. If the Banding consistency appears to be Random banding, the cause is probably not mechanical.
Troubleshooting:
Work through the "Random banding - troubleshooting checklist" in the "Banding troubleshooting road
map" on page 7.
5. If the Banding consistency appears to be Repeatable banding (repeated on each page or separation):
Determine if the cause of the banding is mechanical or not:
1. Print 3 copies of the TS_1on_3off horizontal lines job, and the TS_1on_3off vertical lines job.
2. Note: The TS_1on_3off horizontal lines job is extremely sensitive to banding. Ignore any new
bands that may appear. At this stage ONLY focus on the specific banding identified on the
TS_Banding2 job, TS_Gray20 job and customer jobs.
3. Compare the two jobs:
Job comparison
Same banding appears at the
same places on both jobs
Horizontal lines job:
•
Has specific banding,
but the vertical lines job:
•
None or much less
Inconclusive
EN
Diagnostic purpose
Defining Banding Consistency
Identifying which Separations banding occurs
Identify misregistration - banding is accompanied by waves – vertical misregistration
st
copy of each job.
nd th
to 5 as follows:
Figure 3 TS_Gray20 job Figure 4 TS_Banding2 job
Action
Perform "Troubleshooting Repeatable banding with Non-
mechanical causes" on page 10.
•
Perform "Troubleshooting Constant banding with
Mechanical causes" on page 10.
•
Perform "Troubleshooting Periodic banding" on page 11.
Perform "Appendix 7 Optional alternative mechanical banding
diagnostic method" on page 25.
Banding troubleshooting 9