HP Designjet T3500 Production eMFP - Manual (Page 233)

2. If the problem persists, proceed to analyze patterns 4, 13, and 14 of the diagnostic plot. If you find a
problem similar to that shown below, call HP support and report a “stop-start effect” error.
Vibration
If your printer is not properly placed on a flat surface, or if the scanner lid does not close correctly, you may
sometimes find that the scanned image suffers from vibration, as in the following example: original on the
left, scanned image on the right.
1. Make sure that the scanner is placed on a flat surface, the scanner lid is correctly closed, and the printer
is not working while you are scanning. Scan your original again.
2. If the problem persists, change (increase or decrease) the scanning resolution and re-scan your original.
We also recommend turning the original 90 degrees before scanning it again.
3. If the problem persists, analyze pattern 4 of the diagnostic plot. If you see the problem shown on the
right, call HP support and report a “vibration problem”.
Horizontal periodical banding
This problem can be found in scanners with a defective pressure roll in some CIS modules. In this case, you
may sometimes find horizontal periodical bands in your scanned images, separated by around 5 cm (2 in), in
the area covered by one CIS module, as in this example: original on the left, scanned image on the right.
Please note the black arrow indicating the scanning direction in this example.
ENWW Vibration 223