IR 1600 - bright copy affections

[Smiley27]

What things possibly effect to brightness of copy on this machine, I can count 2 things:

OPC drum <--

optics ( those 2 narrow glasses with that black thing betwen) <---


Can some1 count others?


Thanks for your help.

[bojans]

Re: IR 1600 - bright copy affections

What things possibly effect to brightness of copy on this machine, I can count 2 things:

OPC drum <--

optics ( those 2 narrow glasses with that black thing betwen) <---


Can some1 count others?


Thanks for your help.

Laser Unit

[teckat]

Re: IR 1600 - bright copy affections

What things possibly effect to brightness of copy on this machine, I can count 2 things:

OPC drum <--

optics ( those 2 narrow glasses with that black thing betwen) <---


Can some1 count others?


Thanks for your help.

Contact Sensor
The machine uses a contact sensor (CS) for original exposure and original reading.
The CS is a single module consisting of the following, and is used to read images in lines: 2 sets of LEDs (R, G, B); photo conducting medium used to shine the light of the LEDs across a single image line of an original; rod lens array used to collected reflected light by the original; CCD array used to detect reflected light. It reads an image line by line.

A/D Conversion
The image data (analog signals) from the CS are converted into 10-bit digital signals.
At this time, gain adjustment is executed to increase the level of the input signals to suit
conversion by the A/D converter.
The size of the increase at time of gain adjustment is determined when gain adjustment
is executed in service mode. During gain adjustment, the CS unit shines LED light against
the standard white plate to measure the density of the white plate. The data is subjected to
computation, and the result is store in memory as the gain adjustment value.

Shading Correction
The light reflected by an original and read by the CS, even if the original is completely
uniform in density, will not necessarily be even in relation to image signals corresponding
to pixels on the original for the following factors:
[1] The intensity of a specific LED is not the same as that of other LEDs.
[2] The intensity of reflected light collected by the rod lens array is not even.
Shading correction is executed to correct any discrepancy caused by these factors, and it may take the form of black shading correction or white shading correction.

Black Shading Correction
The input signal of the CS while the LEDs are kept OFF is read, and is subjected to A/D
conversion (black correction), storing the result (digital signal) in memory.
When an image is read, the black correction value is subtracted from the value of the image signal read by each pixel of the CS by way of full pixel black shading correction.

White Shading Correction
The light of the LEDs is directed against the standard white plate, and the CS input signal
is read. The result is subjected to A/D conversion (white correction), storing the result
(digital signal) in memory.
The image data to which black shading correction was executed is then subjected to computation using the white correction value, thus executing full pixel white shading correction.
As a result, the variation in LED intensify and in the intensity of the rod lens array are corrected, evening out the image density level.
Shading correction is executed as follows:
Re-Ordering
The input signals from the CS consist of image data read simultaneously by each of the
4 systems of CCD device units; thus, they are not in the same sequence as the signals that represent the original image, re-ordering.

ABC (auto background control)LED Intensity Adjustment
So that the image data read by the CS unit will always be optimum, the length of time during which the LEDs are ON when reading a single line is controlled.
In LED intensity adjustment, the light of the LEDs is directed to the standard white plate during pre-scanning, and the image data thus collected is evaluated to see if it is within a specific range; if, for instance, it is outside the range, the length of time is decreased.

Editing
The machine offers blanking/masking, negative/positive reversal, and the like as editing
functions.
Density Conversion-Density Adjustment-Density Correction

LASER EXPOSURE SYSTEM
The laser exposure system consists of the following: laser unit, which is the source of laser light; scanner motor, which is equipped with a 6-facet mirror for scanning; and BD PCB, which is used to control the laser light.
The video signals coming from the image processor PCB are sent to the laser driver PCB, which turns on and off the laser diode according to the video signals from the DC controller PCB to generate a modulated laser beam.
The modulated laser beam is converted into a parallel beam of light by a collimator lens and cylindrical lens. After conversion, it is directed to the 6-facet mirror, which is rotating at a specific speed. The laser beam reflected by the lens is then led to the imaging lens and reflecting mirror (arranged in front of the 6-facet mirror) to reach the photosensitive drum.
The laser beam scans the surface of the photosensitive drum at a specific speed as the 6- facet mirror rotates at a specific speed, forming an image on the surface of the drum.

IMAGE FORMATION SYSTEM

[Smiley27]

Re: IR 1600 - bright copy affections

Thanks ! Gonna seek my problem now