issue
HP MFP &
Digital Sender
Second To n Pages
From ADF Are Light
Security Level: For HP and Channel Partner Internal use,
Date Written/Updated: 03/26/2008
SAW Document number: c01170367
Document Summary
This document describes the issue where scanning from the ADF, the first page copies/scans properly,
but from the second page on, the pages are light or show a color cast. It is possible to see this issue
on the LJ4345mfp, M4345mfp, CLJ4730mfp, CM4730mfp, Digital Sender 9200c and the Digital
Sender 9250c.

Issue Description:
Coping a multiple page document from the ADF, the first page is the proper density but
the second and all remaining pages are light. This same issue presents a bit differently
when scanning to folder or scanning to email. The first page is the proper density but
the second and all remaining pages will show a colored hue shift where the black text
turning magenta. We have also see instances as seen below where the text reversed
and becomes white. Some black areas turn magenta and the background going from
white to cyan. The actual effect can very depending on the amount of gain patch miss
registration.
This issue is caused by a miss registration of the scan head and the secondary gain
calibration patch. The scan head reads the primary gain patch at the start of every
scanning operation. It then moves to the ADF scan port and the page is scanned.
However if you are scanning multiple page documents through the ADF, the scan head
reads the primary gain patch, moves to the ADF scan port location and makes the first
copy. The scan head then remains in position at the ADF port and reads the secondary
gain patch before scanning each additional page. If the scan head registration is
slightly off the gain patch, the gain compensation for the scan will be off and the
second through n pages will be light or have a color hue shift.
Note: it should be noted that this issue is different than that seen on the early
M4345mfp that was resolved by a firmware upgrade. The issue showed the same
defect but that issue was caused by a problem in the M4345mfp firmware code. A
M4345mfp exhibiting this defect needs to have current firmware before proceeding.
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Examples:
This is an example of what a scan to email image may look like. When making copies
the second page just looks light.
Page 1
Page 2
Other iterations of second page defects that may be seen.
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Solution:
This issue should be resolved by running the “Calibrate Scanner” routine located in the
Troubleshooting or Diagnostics menu, depending on the MFP model you are working
with. If automatic calibrating the scanner fails to resolve this issue calibrate using the
manual calibration process below.
Manual calibration procedure Materials Needed:
 Target (see files included both a A4-sized target and Letter-size target).
 Metric ruler
Procedure:
1. Verify current setting as follows:
 Press the MENU or ADMINISTRATION key.
 Scroll and touch SERVICE. Enter the service for your
model
 Scroll to and touch SCANNER SETTINGS
 Scroll to and touch GLASS SETTING
 Touch ADF/Glass Scan Start Position
 Record the value in the field; press OK and then
EXIT.
2. Print the last page of this document; this provides you
the Target Page as shown to the right. Please cut off the top
portion page as indicated on the page. This may also be
folded over at the “cut line” if you wish.
3. After the top portion has been cut off (or folded over),
place the Target on the flatbed glass of the hp LaserJet
4345 mfp. Please place the Target face-down, with the cut
(or folded) edge oriented to your left (as you face the mfp).
Ensure the paper is on the flatbed “squarely” and the
corner of the page is next to the Green home-position
triangle on the flatbed.
4. Place any paper in the ADF input guide. We just want
to ensure the ADF Paper Present indicator is illuminated.
The page will be pulled trough the ADF.
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5. Press the START key to make a copy. The copy
should look like the example shown to the right.
Please note there are two parallel lines; one line is
bold and the other line is standard line width. If you
do not get this example, replace step 3.
6. First place the copy page down on a firm working
surface and secondly, lay the Target page on top of it
(see to your left). Align the bold lines from each sheet
of paper on top of one another. See the next page.
7. After aligning the bold lines from the Copy Page and Target Page,
use a metric ruler and measure the distance from the leading edge of
the Target Page to the point where the diagonal line of the Target
Page intersects with the fine line of the Copy Page. Record this
distance.
8. Using the table to the right, find the corresponding value for the
unit of distance you measured. For example, if you measured 20 mm
the corresponding Adjustment Number would be “36”.
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9. Using the steps provided in Step 1 of this document, and go to the “ADF/Glass Scan
Start Position” parameter entry. Enter the value you obtained from Step 8. Then press
OK.
10. Perform some black and white ADF copies, and some ADF color scans to verify the
product is now functioning acceptably.
If the ADF issue can not be resolved by the automatic or manual calibration processes
please escalate the case to division.
Document Attributes
Author Will McMurrey, IPG Technical Marketing
Product Models: HP LaserJet 4345mfp family, M43455mfp family, CLJ4730mfp family, CM4730mfp
family, DS9200c, DS9250c
Product Numbers: Q3942A, Q3943A, Q3944A, Q3945A, CB425A, CB426A, CB427A, CB428A,
Q7517A, Q7518A, Q7519A, Q7520A, CB480A, CB481A, CB482A, CB483A, Q5916A,
CB472A
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