If the Formatter is Your machine's
Higher brain, then a DC Controller may be the system's limbic cortex-its autonomic nervous system. The Formatter may do all of the believing, but what in the printer gets its marching orders by the DC Controller.
The DC Controller can be really a small, printed circuit board assembly which controls the time of all of the assemblies within the printer. All the sensors in the system accounts data to it. All accessories are required to request power. It powers the Formatter also. Below is a listing of DC Control systems and functions:
Paper Motion
Timing
Machine-status
Paper Size and size
High Voltage System
Fusing Infection
Main Motor Drive
DC Powersupply
Toner Level
On some printers, producer has incorporated a process to test componentry, independent of everything Mother Board a secondary manufacturer could have positioned on the machine. This could be the Engine Testa pinstriped pattern which assesses the ability of the engine to print out a page.
Laser Printer Power System
Laser printers incorporate a set of smaller appliances that act as sub assemblies. Each of these sub-assemblies takes power. The Fusing Assembly requires AC power to drive its heatlamp, but everything runs off DC Power.
It's central to every laser printer or photo copier that newspaper movement and imaging be linked. It really is of significant importance that the paper travels through the system in precisely the identical rate as the OPC drum rotates. This permits the toner to become deposited precisely on the newspaper. On average, this can be accomplished by incorporating the OPC's drum gear with all the newspaper drive gear rail.
The newspaper feed program has six occupations:
Extracting the paper out of the storage tray.
Aligning the newspaper so the printing is parallel into the newspaper's edges, every time.
Propelling the paper beneath the OPC at exactly the same speed the OPC drum rotates.
Drawing the paper throughout the entire Fuser at the Identical speed as the toner is bonded
To the newspaper.
Ejecting the newspaper to a designated storage area when complete.
Keeping the DC Controller consistently advised of the status of the Procedure.
This practice is handled differently with various printers, but long experience has given us the basis for several interesting generalizations.
The straighter the paper course, the better your paper trail. Straight paper paths can adapt more-difficult websites and may provide high end at greater rates. Conversely, the further turns the paper has to create, the longer errorprone the machine will be.
The greater the cross sectional area of rubber employed to maneuver the paper, the freer the paper movement will probably soon be. Systems with big continuous pliers feeding to large continuous rollers generally fare far better than small minimal-diameter rollers feeding into the same that there will undoubtedly be fewer paper jams.
Because it's a coarser ribbon and sacrifices more fiber through the print method, bonded paper will make feed problems about four times as quickly as hard-finished agent paper. In multiple-tray machines, even lower trays infrequently perform exactly the exact same efficacy as top ones. For instance, the SX machines using two trays require double the work of their Pickup Assembly for its lower slot, as is necessary for the top one, because the feed path from the low Roller into the Registration Assembly is twice as much as using the upper feed. About the NX machines, however, there seems to be little or no difference.
With this in mind, it's not difficult to understand why many printer repair technicians are uneasy with the printers using wheels that are small and torturous S-shaped paper course.
On the plus side, newer printers have been definitely a big step up from prior models, and the horizontal enrollment procedure, which uses oblique rollers to align the newspaper against the left side of their machine, works more effectively than anyone would have envisioned. These methods are discussed more fully in a specific comment on the respective engines.
Once we've seen, to get proper printing performance, a lot of things must take place simultaneously with wonderful precision. Newer printers go through various strings. On the EX, as an instance, the process goes as follows.
Warm-Up
Turning the printer On begins the warmup period, which continues until the Fusing Roller temperature reaches 172 C. As the energy is based on, the Exhaust Fan (FMI) starts turning at a low-speed"wait" state. Before the Fuser hits temperature, the key Motor (MI) is changed On, and AC high voltage is placed on the Primary Charge Roller to remove any residual charge trom the OPC drum.
The Move Charge Roller is removed from any additives buildup by the use of high voltage. Whenever the Fuser reaches temperature, the key Motor and AC highvoltage have been switched Off. By this moment, such a thing still in the newspaper course is cleared by the Main Motor spinning. The printer goes on the web at the conclusion of warm up, displaying a 00 READY message. Now, the control panel is operational.
Standby
The printer is currently in the standby span and prepared to print. The Exhaust Fan proceeds to operate at low rate.
Initial Rotation
Once the READY signal is correct, and publish orders will be received by the printer by the host computer, then the Formatter will send a print signal (PRNT) into the DC Controller. The DC Controller then enables the Fusing Roller to Start warming up additional to 183 C, and starts the Main Motor (M1), the Pickup Motor (M 2 ), and also the Scanner Motor (M 5 ).
Initial timing is established by powering the Laser Diode to creates one brush beam.
The previously started Main Motor is now turned On ( to full power-it's like starting an automobile, then putting it in gear) as well as the Exhaust Fan is changed to high-speed rotation. The DC Controller currently releases high standing charges.
The main Charge Roller (in the capsule ) receives AC highvoltage and unwanted DC high voltage, even whereas negative high voltage is put on the Transfer Roller to remove excess toner. Precisely 1.16 seconds after the key Motor is turned On, a negative AC/DC growing bias is placed on the Building Roller. After exactly 4 minutes, the Transport Roller charge becomes positive.
Initial rotation ends with paper feed, since the Fuser fever reaches 183 C. At the EX, this contributes to among two Solenoids energizing to discharge a pickup roller to get whichever T Ray that the user has selected.
Three errors can happen from the act; H P anticipated them in designing its own display logic. In the event the Fuser doesn't get to the correct temperature at the allocated time period, then the Formatter is indicated to display 50 NEEDS SERVICE. In the event the BD signal isn't received by the DC Controller, the Formatter is signaled to display 51 ERROR. The Scanner Motor needs to meet precise and rigorous requirements. Attempting to do so results from the Formatter showing 52 ERROR.
Print
The printing period is initiated by a top of print (TOP) along with a column notice (B D ) signal currently being delivered into synchronized fashion by the DC Controller into your Formatter, only at the end of the initial rotation interval. The cause for that is mechanical; both signals are routed if the leading edge of this paper triggers the Input/Registration Sensor (PS1).
At this point, the top edge of the newspaper is quite near the juxtaposition of the Transport Charge Roller and the OPC drum. Writing must begin very quickly.
The DC Controller translates the VDO data into a video out (VDOUT) signal, which in turn modulates the Laser Diode On and Off.
Remember, this corresponds to the writing period of the imaging procedure, previously clarified. Printing proceeds in different, onlıne cycles as VDO data is sent out of the Formatter in response to the triggering BD signal that is released every time a different facet of the Scanner Mirror is in the correct place, allowing the DC Controller to make a VDOUT signal.
Because the suitable high voltage charges were constantly applied into the Primary and Transfer Charge Rollers (positive high voltage comes to the Transfer 'em approximately 1.87 seconds after the very first VDO signal) also into the Construction Roller the latent image created in the OPC drum is developed and afterwards transferred to the newspaper. The charge is taken to earth by the Static Charge Eliminator, and the newspaper with all the moved image moves the Fusing Assembly. This toner is then melted and forced to the fabric of this newspaper. This tends to Reduce the temperature of this Fuser Roller.
When the top edge of the paper confuse the Paper Exit Sensor (PS3), the DC Controller signals the Fusing Roller to heat backup to 183 C.
After the DC Controller describes the last line of print data for a full page, the method starts once again; the Laser Diode is switched onto build a sweep ray that again adjusts the laser power. After the DC Controller verifies this measure by reception of a B D signal, it tums that the Laser Diode Off and searches to get a PRNT signal to begin another page.
Errors that may occur during that period are exactly the same during the primary rotation interval, with the additional probability of a 41 ERROR, suggesting that a sheet of newspaper has been fed too quickly, or an shaky b-d or TOP signal was received.
When the DC Controller does not get the expected PRNT signal from the Formatter, it moves the machine in the previous rotation span. The last rotation period enacts several maintenance steps to maintain the system ready for printing. A nominal standby voltage is placed on the Transfer Roller to stop the toner attraction about 1.7 seconds after the last spinning period begins.
The Transfer Roller voltage returns to negative high-voltage 5.98 minutes into the period of time, inducing any toner on the top layer of the Transfer Roller to be collected from the Waste Bin.
The system returns to standby status, reducing the Fusing Roller temperature to 172 C. The Man Motor and Scanning Motor are switched off, along with the AC high voltage to the Primary Charge Roller, and also the Move Roller voltage returns to 0 volts The Exhaust Fan switches back into low speed about 30 minutes later.
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