The sensor cover has a hole in it to allow light to fall directly onto the sensor. Sampling starts 6 millimeters from the leading edge of the original and continues for These lengths "a" and "b" will vary depending on the selected reproduction ratio A copier only. The lengths "a" and "b" for each reproduction ratio are calculated as follows:.
The photosensor circuit converts the light intensity to a voltage. The detected voltage is amplified and sent to the main board.
If less light is reflected from the original the image is darker , the sensor outputs a lower voltage. The CPU compares the maximum detected voltage with the standard voltage and compensates the copy image density by changing the development bias voltage. Depending on the SP34 setting, the development bias and the exposure lamp data are increased or decreased for both ADS and manual ID modes.
Depending on the manual image density setting on the operation panel, the exposure lamp voltage is changed as shown in the table below:. The light intensity may decrease because of dust accumulated on the optics parts. This may cause dirty background on copies. To compensate this, V L correction is done. The table below shows the relationship between the SP setting and the interval. The exposure lamp voltage is increased depending on the selected magnification ratio in order to compensate for the change in concentration of light on the drum.
The erase lamp [A], which is installed in the upper unit, consists of a single row of LEDs extended across the full width of the drum. The erase lamp has the following functions: leading edge erase, side erase A copier only , and trail edge erase. The entire line of LEDs turn on when the main motor turns on.
They stay on until the erase margin slightly overlaps the lead edge of the original image area on the drum Lead Edge Erase Margin. This prevents the shadow of the original edge from being developed on the copy.
At this point, side erase starts A copier only. The width of the leading erase margin can be adjusted using SP Based on the reproduction ratio, the LEDs turn on in blocks labeled "a" - "h" on the previous page. This reduces toner consumption and drum cleaning load. The CPU determines which blocks to turn on based on the selected reproduction ratio as follows:. The entire line of LEDs turns on after the trailing edge of the latent image has passed 10 mm from the erase lamp. The length of the latent image is determined by the paper length which is checked by the registration sensor.
The LEDs stay on to erase the leading edge of the latent image in the next copy cycle. After the final copy, the erase lamps turn off at the same time as the main motor. When the main motor turns on, the development roller [A] and two agitators [B] and [C] start turning. The turning sleeve of the development roller carries the developer past the doctor blade [D] which trims the developer to the desired thickness.
The development roller sleeve continues to turn, carrying the developer to the drum [E]. When the developer brush contacts the drum surface, the negatively charged areas of the drum surface attract and hold the positively charged toner.
In this way, the latent image is developed. The development roller is given a suitable negative bias for preventing toner from being attracted to the non-image areas on the drum which may have a residual negative charge. The bias also controls image density. When the main motor [A] turns on, the drive is transmitted to the development roller gear [B] through idle gears.
The rotation of the development roller gear is transmitted to the agitator gears [C] through idle gears. A cross-mixing mechanism is used to keep the toner and developer evenly mixed.
It also helps agitate the developer to prevent developer clumps from forming and helps create the triboelectric charge. Two agitators helical coils [A] and [B] are used for the cross-mixing. The 1st agitator [A] moves the developer from left to right. The toner supplied from the cutout in the toner cartridge holder is mixed with the developer by the 1st agitator.
The 2nd agitator [B] rotates in the opposite direction and moves the developer back from right to left. In this way, the developer is evenly distributed in the development unit.
The magnets in the development roller [C] attract the developer, and the development roller sleeve rotates to carry the developer to the drum. The doctor blade [D] trims the developer on the development roller to the desired thickness. The image density is controlled by changing two items: the amount of bias voltage applied to the development roller sleeve, and the amount of voltage applied to the exposure lamp.
Applying a bias voltage to the development sleeve reduces the potential between the development roller and the drum, thereby reducing the amount of toner transferred.
As the bias voltage becomes greater, the copy becomes lighter. The method of control depends on whether the image density is manually selected or auto image density is used. The development bias voltage applied to the development roller sleeve has the following factors:. The base bias voltage for non-image areas between copies is — volts. The above correction factors are also applied. SP36 is for manual ID level 5 only. The base voltage applied at each ID level is shown in the above table.
Normally, notch 3 is used for the ADS mode. The base exposure lamp voltage also varies depending on the manual ID level as shown. The base bias voltage at manual ID level 5 can be changed using SP36 as follows:. Image density is controlled by changing only the base bias voltage. The base bias voltage for ADS mode depends on the background image density of the original which is measured by the ADS sensor. See page for more information about the ADS sensor. This circuit has a peak hold function.
The peak hold voltage corresponds to the maximum reflectivity of the original. The CPU then determines the proper base bias level with reference to the peak hold voltage. The table below shows the relationship between the original background density ADS voltage ratio and the base bias voltage. Using SP 34, the base bias voltage and the exposure lamp data can be increased or decreased for both ADS mode and all manual ID levels as follows:. To compensate for this, the bias voltage is increased by —10 V every 5 k copies.
The V R correction is done up to 20 k copies. The V R correction will not change after 20 k copies. This energizes the development bias circuit within the high voltage supply board which applies a high negative voltage to the development roller. The development bias is applied whenever the drum is rotating.
When the toner bottle [A] is set and the lever [B] is pushed down, the chuck [C] pulls out the cap [D], and the toner bottle is opened. While the TD toner density sensor detects enough toner in the developer, the toner supply clutch [E] is off, and the main motor drive is not transmitted to the gear [F].
When the TD sensor detects a low toner condition, the toner supply clutch is energized and the drive is transmitted to the gear [G] through idle gears.
The gear [G] drives the toner bottle gear [H], and the toner bottle rotates in the direction of the arrow. The toner bottle has a spiral groove that helps move toner to the toner bottle opening [I]. Then the toner is carried up to the opening [J] of the toner bottle holder by the rotating fins [K], to be supplied into the development unit.
The TD sensor is located under the 1st agitator [B]. The developer being conveyed by the 1st agitator passes over the top of the sensor. As the toner in the developer is consumed during development, the toner to carrier ratio changes resulting in a change in the magnetic permeability of the developer. This in turn is converted to a corresponding voltage. The CPU monitors the voltage to control the toner supply mechanism. How to install drivers Select to find downloads for your equipment. Eliminate print servers with the PrintUp app.
Read the brochure for details. Download configuration guide. More downloads. Universal Print Driver Enables users to use various printing devices. Citrix Support A single, intelligent advanced driver, which can be used across your fleet of multifunction and laser printers. Device Manager NX Lite Simplify printer monitoring and management of your multifunction device fleet. Print Cloud Virtual Driver Print driver to submit jobs from anywhere to be released from any Ricoh Smart Integration enabled multifunction printer.
Compatible with PC and Mac. Recommended for you. Enter a new password. Technical Bulletin No. This was because the lower bias limit had been eliminated to facilitate factory adjustment.
A lower bias has now been restored to correct this problem per field request. Combining tab and Selecting tab copying and staple copying at the same time has been staple modes disabled. Designated page Designated page copying onto tab sheets has been disabled in the copying restriction platen and SADF modes. If a customer selects this feature, copies are made onto the slip sheets. Default: No Inverter pinch roller The energizing of the inverter pinch roller solenoid timing has been solenoid changed from 40 to 20 ms after the paper passes through the fusing sensor.
This is a timing optimization for tab sheet copying. Side to side After finishing the interrupt copying, the lens did not return to the registration position where the lens was before the interruption. For part number and cut-in serial number information, refer to MB You can only view or download manuals with.
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