Question about HP Color LaserJet 3500 Printer

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How to clean Density Sensor of Hp 3500 ?

Where is the location of density sensor ? I have to clean it because printer gives me density sensor out of range error. Maybe i can solve this problem when clean it.

Any advide will be appreciated.

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  • Anonymous Mar 07, 2008

    I have same eror.



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Thank you for this info. I used your advice to fix my HP printer and it worked. By the way, great link to HP support parges on the site. I was able to fix my printer and by the way purchased more printer parts and fusers. Thank you again!

Posted on May 02, 2008

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HP Laserjet 3500 prints grey in background

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Image halftone control (D-half)
The control is to measure the halftone density sent from the formatter and send the
measurement back to the formatter so that the formatter can perform an ideal halftone
The DC controller controls the D-half, following the sequence below, upon receipt of a
command from the formatter.
The following is the sequence of this control.
1. The DC controller forms each color’s density detection patterns on the ITB according to
the image data received from the formatter, at the best developing bias value adjusted
under the D-max control. Partshere Troubleshooting
2. The DC controller detects the density of the density detection patterns on the ITB by the
image density detection and sends the data back to the formatter. (See Figure 5-56.
Image density detection, below)
3. The formatter calibrates the halftone based on such data to obtain an ideal halftone
Image density detection
The density of all four colors’ image density detection patterns formed on the ITB is detected
to adjust the image density.
The DC controller controls the color misregistration sensor (PS5) during the foregoing D-max
and D-half controls for this detection. PS5 consists of two detection sensors, which are used
in conjunction with the images on the ITB, each having one light emitter (LED) and one light
receiver (PD).
The following is the sequence of this control.
1. The DC controller sends LED DRIVE signal (REGLED) and lets the LED emit light.
2. The light of the LED is reflected off the density detection patterns on the ITB and
received by the PD on the sensor. The light amount received at the PD differs
depending on the toner density where the light is reflected off.
3. The light receiver converts the received light amount to voltage and sends it to the DC
controller in the form of the IMAGE DENSITY DETECTION signal (REGPDD).
4. The DC controller converts the REGPDD signals to density value (digital) and stores
Figure 5-56. Image density detection Partshere Troubleshooting
The DC controller notifies the formatter of each error when the following errors are found
during image density detection. The initial value is reset to the new image density
adjustment value when an error occurs.
􀆔 Image density sensor abnormality warning: No light is received at the light receivers.
􀆔 Image density out of guaranteed range warning: The measurement is found to be out of

Posted on Mar 15, 2008


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Initially I would follow the directions for clearing drum related errors:

Dark or white lines or streaks in all colors, including black.
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Then clean the density sensor.
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Open the upper right door.
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3 Close the upper right door.

It could possibly be a problem with the transfer drum.

I am sorry this is not of much help!

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It can get toner on it, so check it and give it a clean. But do not touch it with your fingers.

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