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Troubleshooting
HP Designjet T1100 MFP, 4500mfp, 4500 Scanner, 820 MFP Service Manual
1-34
Erase the Parameter Block in the Scanner
The Scanner has a memory block called the Parameter block. The Parameter
block contains the following:
Stitching values camera transition a/b and b/c
Basic calibration information
Level for uncorrected light profile
Corrected light profile
Camera matching, gray
NTSC color space
sRGB color space
Date of the last calibration
The information that is stored in the Parameter block is gathered during the
calibration of the scanner (Scanner Maintenance).
In rare instances, the stored values will vary too greatly from current read
values, which can cause the scanner to report an error. The easiest way to
solve this problem is to erase the Parameter block.
When to Erase the Parameter Block
It is beneficial to erase the parameter block under the following
circumstances:
If the Scanner Maintenance is unable to recognize the calibrating sheet.
If error messages such as the the following appear:
– "Unable to correct camera x"
– "Unable to stitch camera x/x"
Before changing any hardware, especially before changing the main
board or the camera boards
Before performing any camera adjustments
How to Erase the Parameter Block
All of the information in the Parameter block is restored when the Scanner
Maintenance is run.
To erase the Parameter block and run the Scanner Maintenance, follow

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Troubleshooting

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4500mfp, 4500, 820 mfp

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