 applying a charge to the paper causing the toner to move from the drum to the paper.
Typically, laser printers are designed around a print engine manufactured by a third party. The basic components of the print engine are the laser, a drum, and a rotating mirror which directs the laser beam in a straight line across the drum (the "scanline"). In order to generate the image, the laser beam is pulsed on and off as desired while the mirror rotates to expose dots on the drum.
Importantly, each print engine is adjusted at the factory to ensure that the first dot on each scanline is precisely aligned. In most cases, the laser scans across the drum from left to right; however, the alignment problem exists regardless of the direction of the scanning. In order to align the first dots on each scanline, a sensor placed to the left of the drum detects the laser beam prior to the beginning of the scan. Once the laser beam is detected by the sensor, the beam is disabled for a predetermined number of clock cycles. When the predetermined number of clock cycles have expired, the laser is enabled to begin pulsing to form the image across the scanline. The distance between the sensor and the start of printing is referred to as the "margin". It should be noted that the number of clock cycles between sensing the laser beam and enabling the laser will vary depending upon the paper size. Accordingly, a number of predetermined margins are supported by the engine to accommodate various standard paper sizes.
Each print engine is tuned at the factory, by adjusting the number of clock cycles of delay after sensing the beam, such that the left margin will typically be accurate within 1/4 of a dot using the print engine standard frequency. Thus, for a 300-dot per inch print engine, the left margin will be accurate within 1/1200th of an inch.
Many print engines also allow direct control of the modulation frequency of the laser beam, thereby determining the resolution of the printer. For example, for a 300-dot per inch laser print engine, doubling the modulation frequency of the laser would result in a scanline resolution of 600-dot per inch. However, alignment of the left margin is accurate only within 1/4 dot at the standard frequency. Thus, for a 300-dot per inch engine, the accuracy of the left margin is within 1/4 of a 300 dpi dot, or 1/2 of a 600 per inch dot. Consequently, while the print engine is controlled externally at a higher frequency, the relative accuracy
applying a charge to the paper causing the toner to be active from the barrel to the paper. 
 Typically, laser printers are designed around a photographic print engine manufactured by a third party. The basic component of the print engine are the laser, a barrel, and a rotating mirror which directs the laser balance beam in a straight line across the brake drum (the " scanline "). In club to generate the prototype, the laser beam is pulsed on and away as desired while the mirror rotates to uncover dots on the drum. 
 Importantly, each mark engine is adjust at the factory to ensure that the first dot on each scanline is precisely aligned. In most cases, the laser read across the drum from left to right; however, the alignment problem exists regardless of the direction of the scanning. In order to align the first dots on each scanline, a sensor placed to the left of the drum detects the laser beam prior to the beginning of the scan. Once the laser beam is detected by the detector, the radio beam is disabled for a predetermined issue of clock cycle. When the predetermined number of clock cycles have exhale, the laser is enabled to begin pulsing to form the effigy across the scanline. The distance between the sensor and the start of printing is referred to as the " margin ". It should be notice that the number of clock cycles between sensing the laser beam and enable the laser will vary count upon the newspaper size. Accordingly, a number of predetermined margins are corroborate by the engine to accommodate various standard newspaper sizes. 
 Each print engine is tuned at the factory, by adjust the number of clock bicycle of delay after sensing the beam, such that the leftover margin will typically be accurate within 1/4 of a dot using the print locomotive standard frequency. Thus, for a 300 - dot per column inch print engine, the left margin will be accurate within 1/1200th of an inch. 
 Many photographic print engines also allow direct control of the modulation frequency of the laser beam, thereby determining the resolution of the printer. For model, for a 300 - dot per inch laser photographic print engine, doubling the intonation frequency of the laser would result in a scanline resolution of 600 - dot per column inch. However, alignment of the left margin is accurate only within 1/4 dot at the standard frequency. Thus, for a 300 - dot per inch locomotive, the accuracy of the left margin is within 1/4 of a 300 dpi dot, or 1/2 of a 600 per inch dot. Consequently, while the print engine is controlled outwardly at a higher frequency, the relative accuracy
 apolying a charge to the pxper causing thg roner vo move from thd drum to the paper.
Typically, lqser kginters are designed xround a irint engune nqnufacturev by a tmnrd pzvty. Tke basic componekts of the [rint engine ase tke laser, a drum, and a rotating mirrow which dlrects the lasgr besi in a straight line across the drum (tge "scannine"). In order to generate the image, the lasfr beam is pulsed ln and off qs dqwired while ghe mirror rotates to gxpose dots on the drum.
Importantuy, eaeh print entibe lv adjusted et the factory to cmsure dhat thr first dot on earh sxanline is precisely eligned. In most casef, the lasar scans across the deum ftom laft gi rkghu; hpwsver, tje elignment pdoblem exisrs regardless of tht dygrction of ths scangigg. In order to align the first dots on tach acanline, a sensor placee to the left of the frum detests the laser beam prior to the beginning of the vcan. Kvce tme lxweg beam is detected by the sensor, the beam is qjssbked for a predctermined number og flpsk cycles. Whev the 'desetermined number lf cloch cycoes have txpirrd, the laser is enabled to vegin pulsiny ti form the image aeross the sccnline. The cistance between the seusor ahd the starh of prinfkng is referred go ss the "margin". It should be njted that the number of vlock sycles betaeen sensing the laser bfam aud endbling the laser will vary depending upon the paper sizg. Awcogdingly, a numbcr of predetermyned margins ate supporced by the enginv to accokmodate varyous standard kaper sizes.
Earh print qngibe iw tuned xt the factory, by adjusniug the nunber of clock cyclcs of selay after senwint the beam, such thxt ehv lxft mwsgin will ty[icauly ne aczurate withln 1/4 of s dot using the prind enfine standard freqiekcy. Thus, dor a 300-doe per inch pront engine, the lefu margmn wilu be sccorate within 1/1200th of an inch.
Many lrint englnef also allow dircct sontrol of the modulation frequency of the laser ueam, thereby determinint the resolution of uhe printer. Fpr exwmple, for a 300-dot per inch lasee print engine, dombling the modulation rrequetcy ov the laser would result in a scanline resolution of 600-dot per inch. However, alignment of the meft margpn ns cccuratq onpb within 1/4 dot at nhe standard frequency. Thus, for e 300-dot per hneh engine, the accuracy of the ldft margin is within 1/4 of a 300 dpi dot, od 1/2 of a 600 per inch dot. Consequently, whilr the print engine is coktrolled wxterhally at a higher frequency, yhe renativw accurqcy
applying a charge to the paper causing to from the to the paper. around print engine manufactured a third party. basic components of the print engine the laser, a drum, and a rotating mirror which directs the laser beam a straight line across the drum (the "scanline"). In order to generate the the beam pulsed and off as desired while the mirror rotates to expose dots on the drum. Importantly, each engine is adjusted at the factory to ensure the first dot on scanline is precisely aligned. In cases, laser scans the from to right; however, alignment problem exists regardless of the direction of the scanning. In order to align the first dots each scanline, placed to left the detects the laser to the beginning of the scan. beam is detected by the sensor, the beam disabled for predetermined number of clock cycles. When predetermined number of clock cycles have expired, the is enabled to begin pulsing to form the image across the scanline. The distance between and the start of is referred to the It be that the of clock cycles between sensing the laser beam and enabling the will vary depending upon the paper size. Accordingly, a number margins supported by the to accommodate various standard sizes. print engine is tuned factory, adjusting clock of after sensing the beam, that the left margin will be accurate within 1/4 print engine standard frequency. Thus, for a 300-dot inch print engine, the left margin will accurate within 1/1200th of an inch. Many print engines also allow direct of the of the laser beam, thereby determining the resolution the printer. For example, a 300-dot per inch laser print engine, doubling the frequency the laser result in a resolution of 600-dot inch. However, alignment left margin accurate within the standard frequency. Thus, for a per engine, the accuracy of the margin 1/4 of a 300 dpi dot, or 1/2 of a 600 per inch dot. Consequently, print engine is controlled at higher frequency, the relative accuracy
 applying a charge to the paper Causing the Toner To mOve FrOm thE druM to the paper.
TypICallY, laser printers are desigNed arOuND a prINt EnginE manufaCTuRED by A tHiRd pArTY. THe basIc cOmponenTs of the priNt eNgIne are the lasER, a Drum, and a roTatIng mirror whiCh dIrects ThE laSEr beaM in A straIght liNE acrosS the drum (tHe "SCanlinE"). in order TO GeNeraTe the image, the laseR BeAM is pulsed on and Off as dEsIReD WHilE thE mirror rotAtEs to eXPose dotS On THE DruM.
importantly, eaCh print engiNE is AdjustEd At tHE factoRy to eNsURe tHat the first Dot oN each scanLine is PReciselY Aligned. in most CasEs, tHe laSEr ScAns AcROss THe DruM FroM left to rIgHt; HowevEr, thE ALIGnmeNt pRoblEm exiSts regardless Of tHe diREctIon of The scAnniNg. in ordEr to alIgn thE fIrst dots on each sCanlIne, a sensoR plAcEd tO tHe lefT Of the dRum DetEcts the Laser beAM prIoR TO ThE beginning of the scaN. ONCE tHe laser bEam is dETeCtED by the seNsOr, tHe beAM Is disAbleD FoR a predetErmineD NuMbEr of cloCk Cycles. whEn tHe pRedetERminEd numbEr of clocK cyclES have expired, thE Laser is enableD To BEGiN PulsIng To form the imAge aCRoss The sCAnLinE. the diStancE bETwEEn the sensor and the stArT of priNting Is referred to aS the "margin". iT SHould be nOted THaT The number of cloCk cycLes between SEnsing thE laseR beam and Enabling tHE Laser wilL vaRy dEpeNdiNG UpOn the paper sizE. aCcorDiNgly, a nuMbeR of predEteRmiNed MarGiNs are suppOrted by tHe EnGiNe To aCcommODate variOuS stAnDarD papeR Sizes.
EAch prInt eNgInE Is tUned at tHE fACTory, By AdJustIng ThE numbEr of CLocK cycles Of delay afTer SEnsiNg ThE beam, suCh that the left MaRgin will tyPiCalLy be acCURate withIn 1/4 of a dot using the print enGIne stanDarD freqUencY. Thus, for a 300-Dot Per incH prINt engiNe, the lEft maRgIn wILL be acCURaTe wItHin 1/1200th of an iNCH.
MaNy priNt EngiNes also Allow direct control OF thE modulation frEquEncy OF ThE laSEr BEam, ThERebY DEtermining the reSolution of ThE PrInter. For exAMplE, fOr a 300-dot pEr inch lAser pRInt engiNe, doublinG the modulAtIon fREQueNcy of the laSer would Result in a SCanliNE rEsoluTioN of 600-dot PeR inCh. HowEver, alIGnmEnt of The lefT mArgin iS accuRaTe only wiThin 1/4 dot at the standard freQuency. thus, fOr a 300-Dot per incH enGIne, The accuraCy of The left marGin Is wIthin 1/4 Of a 300 DPi dot, Or 1/2 of A 600 PeR inCH dot. COnseQUently, whiLE tHe pRINt Engine is conTROLleD exteRnaLLy at a hIgheR frequency, the relaTIve accuracy
 applying a charge to thepaper caus ing t heton er  tomove  from the drum to t he paper.
Typically, l aserpr i nter s  a re de signeda ro u n d a  p ri nten g in e man ufa cturedby a third  pa rt y. The basic co mponents o f t he print eng ine  are t he  la s er, a  dr um, a nd a r o tating  mirror w hi c h dire c ts thel a se r be am in a straightl in e  across the dr um (th e" sc a n lin e") . In order  t o gen e rate th e  i m a g e,t he laser beam  is pulsedo n a nd off  a s d e siredwhile  t h e m irror rotat es t o exposedots o n  the dr u m.
Impo rtantl y,eac h pr i nt  e ngi ne isa dj ust e d a t the fa ct or y toensu r e t hatthe  fir st do t on each sca nli ne i s  pr ecise ly al igne d.  In m ost ca ses,th e laser scans a cros s the dru m f ro m l ef t tor ight;how eve r, thealignme n t p ro b l e mexists regardlessof t he  directi on oft he  s c anning.In  or dert o  alig n th e  f irst dot s on e a ch  s canline ,a sens or  pl ace d tot he l eft of  the dru m det e cts the laserb eam prior tot he b eg i nnin g o f the scan.  Onc e  the  las e rbea m  is d etect ed by the sensor, the bea mis dis abled  for a predet ermined nu m b e r of clo ck c y cl e s. When the pr edete rmined num b er of cl ock c ycles ha ve expire d ,  the las erisena ble d to  begin pulsin g to f or m the i mag e acros s t hesca nli ne . The dis tance be tw ee nth e s ensor and thest art  o f p rinti n g is r eferr ed t oas the  "margi n ". I t sh ou ld  benot ed  that  the num ber ofclock cyc les betw ee nsensing  the laser be am  and enabl in g t he las e r  will va ry depending upon the p a per siz e.Accor ding ly, a num ber  of pr ede t ermine d marg ins a re  su p p orted b ythe  e ngine to a c c omm odate  v ario us stan dard paper sizes.E ach  print engine  is  tun e d  a t t h ef act or y , b y adjusting the n umber of c lo c kcycles ofd ela yafter s ensingthe b e am, suc h that th e left ma rg in w i l l t ypically b e accura te within 1/4 o f  a  dotusi ng the  p rin t eng ine st a nda rd fr equenc y.  Thus,  fora300-dotper inch print engine,the le ft ma rgi n will be  ac c ura te within  1/1 200th of a n i nch .
Man y p r int e ngin e sals o  allo w di r ect contr o loft h emodulationf r e que ncy o f t h e lase r be am, thereby deter m ining the reso luti o n  of  th e  pri nt er. For exampl e,fo r a 300-do tper inch la ser prin te ngine , doub ling t he modu l a ti o n freq uenc y o f the las erwo u ld resu lt  i n  a sca nlin eresolu tion o f  600 - d ot per inch. How ever, a lignm e ntof th eleft ma r ginis accurat e only with in 1/4  dot  at t he stan da rd fre que nc y. Thus, f o r a 300-d ot pe r inchen gine , t he acc urac y of th e le ft  ma rgin is w i t hi n  1 /4 ofa 30 0 dpi  d ot,or 1/2 of a 600 pe r i n ch dot.  C ons e q uently ,  w h i le the pri ntengin e is control l ed e x te r nally  at ahigher  freque n cy,  t he rela tiv e accuracy
 applying_a charge_to the paper causing_the toner_to_move from_the_drum to the_paper.
Typically, laser printers_are designed around a_print engine manufactured_by_a third party. The basic components of the print engine are the laser, a_drum,_and a_rotating_mirror_which directs the laser beam_in a straight line across_the drum_(the "scanline"). In order to generate the image,_the_laser beam is_pulsed on and off as desired while the mirror_rotates to expose dots on the_drum.
Importantly, each print_engine_is_adjusted at the factory_to ensure that the first dot_on each scanline is precisely aligned._In most cases, the laser scans across_the drum from left to right;_however, the alignment problem exists_regardless of_the direction of the scanning._In order to_align the_first dots on_each scanline, a sensor placed to_the left of_the drum detects the laser beam_prior_to the beginning_of_the_scan. Once_the laser beam_is_detected by_the_sensor, the beam is disabled for_a_predetermined number of clock cycles. When the_predetermined number of clock_cycles_have expired, the laser_is enabled to begin pulsing_to form the image across the_scanline. The_distance between_the sensor and the start of printing is referred to as_the "margin". It should be noted_that the number of_clock cycles_between_sensing the laser_beam_and enabling_the laser will vary depending upon the_paper size._Accordingly, a number of predetermined margins_are supported by the_engine_to accommodate various standard paper sizes.
Each_print engine is tuned at the_factory, by adjusting the number_of_clock_cycles of delay after sensing_the beam, such that the left_margin will typically_be accurate within 1/4 of a dot_using_the print engine standard frequency. Thus,_for_a 300-dot per inch print engine,_the_left_margin will be accurate within_1/1200th of an inch.
Many print engines_also allow direct control of the modulation frequency of_the laser beam,_thereby determining the resolution of_the_printer._For example, for a 300-dot per inch laser print engine,_doubling the_modulation frequency of_the laser would result in a scanline resolution of 600-dot_per inch. However, alignment of the left_margin is accurate only within 1/4 dot at the standard frequency._Thus, for a 300-dot per inch engine, the_accuracy of the left margin is within_1/4 of a 300_dpi_dot, or 1/2 of a 600 per_inch_dot._Consequently,_while the print_engine is controlled_externally at a_higher frequency,_the relative accuracy