Page 1: ...I I SERVICE MANUAL MAR 1988...
Page 2: ...description of the principles of operation of the electrical and mechanical systems the1r functions and timing of operations Chapter 3 The Mechan1cal System Explanation of mechanical operation disass...
Page 3: ...tem 2 28 CHAPTER 3 THE MECHANICAL SYSTEM I II Ill IV V EXTERNALS 3 1 A Covers and Panels 3 1 B Fan 3 3 C Ozone Filter 3 3 D AC Controller Unit 3 4 DRIVE SYSTEM 3 6 A Main Motor Unit 3 6 PAPER TRANSPOR...
Page 4: ...Pow er Tester 6 4 PARTS FUNCTION 6 31 Ill MEASUREMENT AND A Switches Photointerrupters ADJUSTMENT 6 5 and Solenoids 6 31 A Image Adjustment 6 5 B Motor and Others 6 32 B Mechanical Adjustments 6 5 C...
Page 5: ...CHAPTER 1 GENERAL DESCRIPTION I FEATURES 1 1 IV PARTS OF THE PRINTER 1 5 II SPECIFICATIONS 1 2 V OPERATION 1 7 Ill SAFETY INFORMATION 1 4...
Page 6: ...into a single assembly called an EP S cartridge The cartridge can be replaced by the customer when necessary High printing quality is maintained by a simple cleaning procedure The printer can be opene...
Page 7: ...le time from when a Sig nal is received by the printer while in READY state at an ambient temperature of 20 C until an A4 or Letter sized sheet is printed and delivered 2 min or less after power on un...
Page 8: ...on operatmg env ronment l 1ooc to 32 5 C 50 F 91 Fl 20 to 80 RH 570mmHg to 760mmHg 0m 2500m Under 50dB Al PAINTING Under 45d8 A STANDBY 1 m away from the pnnter 363mm X 423mm x 180mm About 14kg Max 54...
Page 9: ...nding on the pnnter model 1 4 B Addit ional Information When servicmg or adjustmg the opt1cal sys tem of the pnnter be careful not to place screwdrivers or other reflective objects in the path of the...
Page 10: ...A External View Figure 1 3 Figure 1 4 j Cassette holder Upper unit release Upper cover Delivery tray Power cord receptacle Lower cover j Interface connector EP S cartridge Voltage selector Print dens...
Page 11: ...ning exposure lamps Primary corona unit M irror Upper cover Pick up roller j Lower cover Separation pad rr I I I ID I I I Figure 1 5 Registration rollers j Transfer corona unit Photosensitive drum Fee...
Page 12: ...d the ROY sig nal has been made TRUE by the printer pressing the button will cause the printer to print a page of the test pattern If the button is held down the printer w ill pnnt the test pattern co...
Page 13: ...a bar over it e g Pi l5 L is a TRUE signal A TRUE signal will usually cause an action to occur etc a FALSE signal will normally prevent the operation I BASIC OPERATION 2 1 A Functions 2 1 B Outline o...
Page 14: ...aper pick upt feed system To external device host computer n_____ _________ I ln erfaca PCB I INTERFACE SYSTEM 1 L _j r ____ y____ __________ I I IOVERALL CONTROL OC control ler PCB SYSTEM I L __ SL _...
Page 15: ...via the interface PCB 2 2 I I I I I I I I I I I I I I L _ l u 4icc I I I I I l I l Optical fiber Laser diode Scanner motor DC High voltage controller PCB unit Cassette so ze sensing switch Driver sens...
Page 16: ...a a I J r 4 PEMP H when cassette has paper s I tJ Manual feed un1t paper sensor I tl 9______ 9 MPFS H when there IS no pacer on manual feed travl I Drum senSitiVtW ident1ficat1on switches EP S cartro...
Page 17: ...1on roller cluten solenoid 2 4 2 J J 2 1 LOAV H to swttch laser ON PO Voltage 1n propOrtiOn to tntensitv of laser beaml OSAOJ r r_ __ __ _ __ _ __ __ __ __ _J_20_3_ 7 24VA I r S i SCNCONT H to drtve s...
Page 18: ...sure 1 9 amps Lamoboard scanner untt h o ustng Precondrttonrng ___ exposure I r m3 board I I J801 2 i S I ____ J Safety PCB Figure 2 5 r 1 u controller PCB 2 2 PEXPO L to swrtcn lamps ON preconditronr...
Page 19: ...period fixing roller temperature reaches 165 C Two minutes or less man 1 ambient temperature of 1 2o c1 I STBY IFrom the end of the WAIT Fixing roller held at 165 C T STANDBY period until to keep the...
Page 20: ...OTATIONS 1 pnmary corona goes OFF devace the INITIAL period ROTA TIONS peraod begans I a mmedaately LSTA2 From when the primary Last pranted page delivered I If a PANT signal is anputted FINAL corona...
Page 21: ...e drum via a mirror Each face of the scanning mirror in turn scans the beam across the drum The drum also rotates at a constant speed As it rotates the laser beam successively scans across its surface...
Page 22: ...and return to its original position the drum surface has shifted downward by about 85 u m 300 raster lines inch or about 64 u m 400 raster lines inch The laser driver circuit includes switches SW301...
Page 23: ...as current controller is 80 of the drive voltage to the diode reached when the monitor voltage reached its allowable limit At this bias current the laser diode emits no light Bias current determinatio...
Page 24: ...rom the interface PCB it out puts the data of the paper information signals to the sub microprocessor S CPU by an SDATA signal 2 The paper size information is used by the main microprocessor M CPU to...
Page 25: ...peed is set for 300 DPI The speed is changed only when PANT is H and is changed only after a complete page has been printed The frequency of the signal from a crystal controlled oscillator X201 is div...
Page 26: ...N frequency Increases motor sp ed max I Decreases motor speed m n TooSii N r fOcliast Too slow Too fast Target speed I Linear resPonse lock range FGIN freQuency motor speed Figure 2 16 2 APC output an...
Page 27: ...sfe r coro na Lower fol ong rOller B Printing Process Feeder elomonator Figure 2 18 The cartridge used by the printer has a seamless photosensitive drum with the struc ture shown in Figure 2 1 9 The o...
Page 28: ...y resistivity of the drum umform and prepares it to receive a uniform charge 1n the following primary corona step thus preventmg unevenness in the printed rmage Reference The drum surfaoe potential be...
Page 29: ...Magnet A concentrated magnetic field develops be tween the magnet and the blade and attracts parttcles to the edge of the blade They are held almost 1mmob1le ltke a cur tam Th1s curtatn sktms the ton...
Page 30: ...inder D 1 d eveloptng cv tn er M n _Toner 0 DCbtas AC btas g level Drum DC b as v _ Drum surface 11r Time tl potenttal Table 2 8 i Descnpt1on The electrostatic attract1on I caused by the difference in...
Page 31: ...In the fixmg stage the toner 1mage s fixed by heatmg the paper and applying pressure Thts fuses the toner part1cles onto the paper to make a permanent 1 mage Step 7 Fixing Fnung roller _ cleaner g F...
Page 32: ...the output from this sensor falls below a certa1n level the printer sets status 15 bit 6 to 1 and m forms the external device that the pnnter IS almost out of toner and that the cartridge will soon ne...
Page 33: ...ode POWER lSS c ON PANT About 0 5 IOC l tC AOOut 1 J JK I I J ote About DC bias L oout J 1 r 1 ltC 0 6 e I a r 1 4 stc j I I Developong boas AC bias I I Out 0 05 ee 1 AtK ur 0 4 otc r 11 Figure 2 33 N...
Page 34: ...a train of pulses is output ted from pin 1 of Q 1 to the primary wind ings of transformer T3 LED1 goes ON when HV1 ON is L The secondary wind ings of T3 output voltage P for the primary corona dischar...
Page 35: ...cylin der When there is toner between the cylin der and sensor the field sensed by the sen sor 1s strong when there is insufficient toner the sensed field is weak The voltage analog of s1gnal TSENS i...
Page 36: ...er sensor g a oE 1 E oo u w Z a 0 Main motor The paper is fed by the registration rollers so that the leading edge of the paper is aligned with the leading edge of the toner image on the photosensitiv...
Page 37: ...up roller clutch solenoid SL30 1 The main motor M 1 turns the pick up roller one turn feeding a sheet of paper to the regis tration rollers The registration rollers are not turning when the paper rea...
Page 38: ...y 4tr J _ _j I 0152 L Troac 2 Principle of Operation Since the contacts of relay RL 101 of the AC controller are normally closed when the DC controller outputs the FIXING ROLLER HEATEA DRIVE FSRDl com...
Page 39: ...perature of 21 0 C 10 C If the fixing roller temperature rises above this point TP1 cuts off the current to the fixing roller heater 3 Overcurrent protection This is a c1rcu1t breaker CB101 in the pow...
Page 40: ...3 There is a sheet of paper at the delivery unit paper sensor when the power is sw1tched ON The paper is automatically fed out 1 f the fixing unit temperature is greater than the specified temperature...
Page 41: ...I IPCONTl Owooo 1 TTlf L J LJ B Protective System Low voltage power supply Switching control circuit Figure 2 41 24VB r 24VC _ r 24VA i 24 vo 1 o 1 5V I r ORSW t r RESET Jf 5 v If a short circuit or o...
Page 42: ...ing the pnnter 4 Do not operate the printer w1th any part removed 5 To protect the laser device from stat1c electnc1ty connect the shorting connector to laser connector J202 when J202 is disconnected...
Page 43: ...en off simply by removing screws is omitted 1 Upper cover 1 Open the printer 2 Remove the two screws from the upper cover CD Screws Upper cover Figure 3 2 3 Push up on the upper cover with both hands...
Page 44: ...Remove the fourteen screws and remove the base cover CD Screws Figure 3 6 3 2 4 Front bottom cover blanking plate for the test connector slot and TEST PRINT button 1 Remove the upper cover 2 Remove t...
Page 45: ...he three screws and remove the fan mounting plate Q Ozone filter Screws Figure 3 8 51 Disconnect the connector J 153 6 Remove the two screws and remove the fan motor unit FM 1I D Screws Fan motor unit...
Page 46: ...C controller unit 1l Open the pnnter 2 Remove the upper cover and lower unit 3 Disconnect the connector J 1 12 CD Connector J 11 2 Figure 3 12 3 4 4 Remove the ozone filter 5 Remove the fan mounting p...
Page 47: ...3 Remove the two screws and remove the safety PCB CD Connector J 152 Screws Safety PCB Figure 3 16 4 Remove the two screws and remove the AC controller PCB from the PCB cover I I CD Screws AC controll...
Page 48: ...the upper cover and lower cover 3 Remove the sensor power supply unit 4 Remove the p1ck up roller unit 5 Remove the feed guide unit 6 Remove the fixing unit 7 Remove the seven screws disconnect the t...
Page 49: ...liary feed roller Pick up roller unit Figure 3 23 Note When removing the pick up unit be es pecially careful not to press or force the auxiliary feed roller for its mounts can easily be damaged and it...
Page 50: ...can easily be replaced and returned to its origi nal position However a special gauge is required to locate the clutch at the correct position For this reason never replace the pick up roller clutch i...
Page 51: ...stration roller shaft 2 4 D Setscrew Clutch drum Control ring Gear Figure 3 29 3 Remove the spnng D Spring Figure 3 30 4 Remove the hold down spring and E ring and then remove the two bushmgs D Spring...
Page 52: ...hmg CD E rings Gear 3 10 Bushing Figure 3 34 8 Remove the two E rings and bushings 9 Remove the lower reg1stration roller CD E rings Bushings Lower registration roller Figure 3 35 B Feed Guide Unit 1...
Page 53: ...scanner unrt 1 Open the printer 2 Remove the upper cover I 3 Remove the two screws and the blocks holding the lampboard scanner unit housing then remove the housing CD Blocks Screws Lampboard stanner...
Page 54: ...unit It is not field adjustable 3 12 B Preconditioning Exposure Lampboard 1 Removing the preconditioning expos ure lampboard 1 Open the printer 2 Remove the upper cover 3 Remove the two screws and the...
Page 55: ...ve the two screws and remove the preconditioning exposure lampboard unit D Screws Preconditioning exposure lampboard unit Figure 3 45 7 Remove the preconditioning exposure unit cover plate then remove...
Page 56: ...oping unit Photosensitive drum Protective shield Primary corona unit CD Drum cleaning un1 t Figure 3 46 a Protective shield The photosensitive drum is protected by a protective shield that prevents ex...
Page 57: ...sfer Corona Unit 1 Removing the transfer corona unit 1 Open the printer 2 Remove the upper cover and lower cover 3 Remove the sensor1power supply unit 4 Remove the pick up roller unit 5 Remove the two...
Page 58: ...the transfer cor ona un1t 1l Prepare about 850mm nylon line 2 W ind one end of the nylon line around screw A of the transfer corona unit See Figure 3 51 3 W ind the nylon line tightly around the cor...
Page 59: ...untt entry guide Lower fixing roller j Lower delivery roller Figure 3 52 2 Removing the ftxing unit 1 Open the printer 2 Remove the upper cover lower cover and delivery unit cover 3 Remove the fixing...
Page 60: ...plate Figure 3 55 2 Remove the screw and remove the left ter mtnal cover CD Screw Left terminal cover Figure 3 56 3 18 3 Remove the three screws and remove the lead wire and left terminal holder CD S...
Page 61: ...Screw Left heater cover Fixing roller heater Figure 3 60 l j 8 Pull the fixing roller heater carefully out of the upper roller b Thermoswitch and thermistor 1 Remove the left terminal cover 1 and righ...
Page 62: ...J206 J201 Figure 3 64 J21 1 J21 7 Q J2 3 4 Remove the two screws holding the con nector and the four screws holding the DC controller PCB 5 Separate the DC controller PCB from the main unit I CD Screw...
Page 63: ...e the dnver and sensor PCB from the low voltage power supply 3 CD Screws Driver and sensor PCB Low voltage power supply Figure 3 68 C High Voltage Power Supply 1 Open the pnnter 2 Remove the upper cov...
Page 64: ...s Signal ground PCB HVT Figure 3 71 E Cassette Size Sensing Swit ch PCB 1 Open the printer 2 Remove the upper cover and lower cover 3 Remove the sensort power supply 4 Remove the four screws and the H...
Page 65: ...the printer correctly The serviceman should have a complete knowledge of the printer choose a good locatton and check the printer out before it is used I CHOOSING A LOCATION 4 1 A Storage of Sealed II...
Page 66: ...irect sun light If it has to be placed in a sunny place the wmdow s should be curtained to avoid direct sunlight The location should be well ventilated The pnnter should be placed on a sturdy level su...
Page 67: ...c bag from around the printer Remove the tape securing components Cardboard box 4 2 l Check I Remarks I See Figure 4 2 I I See Figure 4 2 Check that the following are I present I Cassette I Delivery t...
Page 68: ...e Figure 4 5 the EP S cartndge and take out are present the cartrrdge Remove the Fixing roller cleaning pad aluminum bag Cotton swab Instructtons for cartndge lnstructtons for ustng fixing roller clea...
Page 69: ...the I paper s1ze and set the paper size I Identification slider Put paper in I I I I the cassette put the cover on the I I cassette then put the cassette 10 I I the prmter I I 15 Connect the pnnter to...
Page 70: ...leave an EP S cartridge in a car for an extended period in warm weather because the interior tem perature may become excessively high 2 Avoid places w ith too high or too low temperature and or humidi...
Page 71: ...ear on prints despite these If this happens stop the printer for a while This will usually solve the problem Note the following 1 Clear paper jams and change the cartridge as quickly as possible to mi...
Page 72: ...AND SERVICING I PARTS REPLACEMENT SCHEDULE 5 1 II CONSUMABLES 5 1 Ill LISTS OF TOOLS 5 2 IV LIST OF LUBRICANTS CLEANERS 5 4 V SERVICE CHECKPOINTS 5 5 A Standard Tools 5 2 VI MAINTENANCE BY CUSTOMER 5...
Page 73: ...I PARTS REPLACEMENT SCHEDULE None II CONSUMABLE None 5 1...
Page 74: ...flat blade screwdriver set CK 0114 I l 1 1 Allen wrench set CK 0151 12 F1le fine CK 0161 13 j Allen hex key CK 0170 I M4 14 Diagonal cuttmg pliers I CK 0201 15 I Needle nose pliers I CK 0202 i 16 Plie...
Page 75: ...r I measunng or adjustmg I laser power I I I 2 I Pnnter dnvefl RY9 0024 B Test pnnter funct1on and I 1 laser dnver laser power tester 1 li I I i ijl 0 r v of I i I i 3 Laser shortmg RY9 0025 B 1 Prote...
Page 76: ...il T68 ISO VG 220 otl ESSO Febis K220 MOBIL Vactra oil no 4 SHELL Tonna oil T220 Use Cleanmg 1 plastic rubber external Iparts Cleamng I 011 and toner statns I i Apply to dnve mechanism Forbeanngs Regi...
Page 77: ...never the cartridge is replaced Fixing unit Clean the fixing unit when the cartndge is replaced Transfer corona unit Clean the transfer corona unit when the cartridge is replaced Primary corona unit C...
Page 78: ...es of Image Defects 6 10 B How to Jse the Troubleshooting Tables 6 11 C Troubleshooting Image Defects 6 12 V TROUBLESHOOTING MALFUNCTIONS 6 22 VI PAPER TRANSPORT TROUBLESHOOTING 6 28 A Print Paper Jam...
Page 79: ...4 7 in chapter 4 b If that does not improve the prints replace the cartridge with a new one 5 The transfer and feed guide plates are clean If they are dirty clean them with damp cloth 6 The fixing rol...
Page 80: ...ntrol panel e r _ c 0 l r Figure 6 2 Control panel of the printer driver laser driver tester TEST PRINT Causes the pnnter to pnnt a pattern spect fied by VIDEO SELECT VIDEO SELECT Selects a test patte...
Page 81: ...0 2 NC J21 0 3 NC J21 0 4 DBDC L to apply DC developing bias J21 0 5 1 sv J21 0 6 DBAC L to apply AC developing bias J2 0 7 GND J21 0 8 HV10N L to apply DC high voltage to primary corona J210 9 sv J2...
Page 82: ...B Laser Power Tester Figure 6 3 The laser power tester is used with a digital multimeter to measure laser power Use the tester as shown below I Figure 6 4 6 4...
Page 83: ...not correct a fixing problem may occur Follow the procedure below to check the nip width 1 Either take along one or two all black A4i Letter size copies made with a copier or make such a black copy u...
Page 84: ...followed to determme whether the fault lies w ith the lasertscanner umt or the DC controller PCB Spectal attention should be given to the fol lowtng tems during troubleshooting Plug the lead into the...
Page 85: ...drover tester J210 J202 Connector 120 pons DC controller PCB U TP208 J202 J J210 T8 01 Connector 5 pons I C 1 J Oigotal multo meter COMV n 9 I Figure 6 9 Printer dnver laser drover tester DC controlle...
Page 86: ...aper 1 7 Vertical black streaks 1 8 Thm black honzontal 1 9 Irregular and 1 1 0 Irregular and 1 11 Blank spots smudged vertical bands smudged horizontal bands lP streaks 1 12 Solid vertical white line...
Page 87: ...sult 1 Measure 1 NO Plug tt tn NO I NO NO YES 1 Close tt Reset tt j Nottfy the customer that this is not a printer problem 1 1Check the door switch 1 Replace it if it is faulty _ _ _ ____J The above t...
Page 88: ...2 1 1 3 and J2 1 1 2 GNDl drop from about 16VDC to OV Three seconds after the ma1 n motor starts does the voltage between I J2 11 5 t SAC and J211 2 IGND drop from about 16VOC to OV 6 12 Result I I Me...
Page 89: ...and J30 1 6 GND drop from about 5VDC to OV When drum sensitivity Identification I Iswitch SW302 is pressed does the voltage between J301 2 CSENS2l Iand J30 1 6 GNDI drop from about svoc to ov Laser an...
Page 90: ...voltage between J301 2 CSENS2l i I and J 30 1 6 GND drop from about 5VDC toOV High voltage I 2 I Clean the contact between the high YES Make sure that the ground1ng connector j voltage connector grou...
Page 91: ...s after the matn motor I voltage connector is making good starts does the voltage between I 1contact with the developing b1as J702 4 DBAC and J702 7 IGND Icontact If so replace the high drop from abou...
Page 92: ...e connector and the static charge elimanator then make a test print Is the print normal Result I Measure YES 1 Replace the cartridge YES 1 Check the wiring from connector 1 J702 to J 701 whether 1 con...
Page 93: ...th 1 Is the transfer gUide d rtY7 I YES Clean 1t w1th a damp cloth then I w1pe 1t w1th a dry cloth 1 Is the transfer corona umt d1rty7 YES Clean 1t w th a damp cloth then I I wipe it w1th a dry cloth...
Page 94: ...e cleaner and make a test prrnt Is the prrnt normal7 I 1 10 Irregular and smudged horizontal bands Possrble Cause Step Check Photosensrtive 1 Do the bands appear at regular drum intervals7 Fixing roll...
Page 95: ...rona unit Result Measure YES Replace the paper NO Result YES YES NO wrap and Advise the customer to store print paper to pre from absorbing moistu vent 1 t re Check that the develop ng b1as s normal M...
Page 96: ...I Driver and sensor 5 Three seconds after the main motor YES Replace the driver and sensor PCB starts does the voltage between I 1 PCB DC controller PCB J301 3 REGDl and J301 6 GND NO 1 Replace the D...
Page 97: ...le Cause Check Result Measure Is the paper size identification slider i NO Set it correctly to the correct position 1 17 Incorrect resolution LP LP enlarged reduced Possible Cause Step Check Result Me...
Page 98: ...age power 4 I Unplug connector J60 1 from the I YES IReplace the low voltage power supply low voltage power supply Is the I supply AC controller untt correct voltage present between I NO j Replace the...
Page 99: ...tage 5 Are the connector pms of the h1gh YES IClean the high voltage connector connector I I voltage cable for developing bias I and the toner sensor dirty I Gfld of prrmarv Oevelopong b1 as Promarv c...
Page 100: ...when a Cassette is out of Paper Poss1ble Cause Driver and sensor PCB DC controller PCB Step I l Check 1 Result I Measure When the cassette is empty 1 s the voltage between connector J30 1 8 1 NO I Re...
Page 101: ...Main Motor Driver and sensor 2 1 Measure the voltage across I NO Replace the driver and sensor I PCB connector pins J30 1 9 MPFSl and PCB J301 6 GNDl when there is no I paper on the manual feed tray D...
Page 102: ...power supply case from about 5VDC to OV at I some time during the printing cycle i 1 NO Replace the DC controller PCB Prtmary corona untt J702 3 r Develop ng btas ACl J702 4 Developtng btas DC J702 6...
Page 103: ...e the AC controller un1t ON does the voltage between connector pins J208 2 and I I 1 J208 3 GNDI of the DC controller PCB go from about 5VDC to OV I DC controller PCB 5 Check that there is a cartndge...
Page 104: ...asses through three major sections CD pick up section separation and feeder sect1on fixing and delivery section This section explains troubleshooting for jams n each of these sections CD Pick up secti...
Page 105: ...ce the spring I clutch rusted or worn Dnver and sensor I 8 Three seconds after the mam motor I YES Replace the dnver and sensor PCB I starts does the voltage between PCB I DC controller PCB J301 3 REG...
Page 106: ...Open the pnnter while the sheet of 1 paper IS passing through the feeder 1 unit Is the paper deformed creased 1 folded etc Entrance gUtde 4 iIs the entrance gutde dirty Fixtng un t 6 30 Result Measure...
Page 107: ...M 3 3 II I Top voew Right side voew PSJJ1 Front VIIIW Figure 6 14 No Function Sensing drum sensitivity SW301 SW302 sw 1 sw 2 Cutting off 24VB and 24VC when printer IS open Sensing if printer is open P...
Page 108: ...6 32 L Rear voew F M 1 f J TH1 M 3 1 Top view Right side voew Front view Figure 6 15 No M1 M3 FM1 Hl TH1 Function Drive motor for drum p1 ck up roller and paper feed roller Drive motor for scanning mi...
Page 109: ...nd external device 3 High voltage power Applying high voltage to primary corona and transfer corona units supply PCB Amplification of toner sensor output 4 IDriver and sensor PCB Mount for vanous sens...
Page 110: ...J501 9 J1 51 4 Safety PCB J502 3 J152 6 AC controller PCB J601 3 J 153 l 2 Fan motor FM 1l J602 14 J261 I 4 Cassette size sensing sw tch PCB J701 8 J301 9 Driver and sensor PCB J702 8 J40 1 I 5 Scanne...
Page 111: ...not touch them dunng after sale service Notes 1 Some of the LED indicators receive leakage current during normal operation causing a dim glow even when they should be OFF 2 Potentiometers which may be...
Page 112: ...m intens1ty Table 6 10 B HVT PCB 0 VR1 V R3 VR2 LED2 LED1 J701 8 Figure 6 19 VRNo Purpose LED No Function VAl 1 Adjusting developing bias DC Variable with print density LED 1 1 For indicating state of...
Page 113: ...0 Driver and sensor PCB rn SW301 SW302 J301 Figure 6 20 SWNo I Function SW30 1 1 For identtfying drum sensitivtty I S W_3_0_2 __ See Table 2 3 fordetatls Table 6 13 6 37...
Page 114: ...ENERAL TIMING CHART A 1 II LIST OF SIGNALS COMMANDS A 3 A DC Cont roller A 3 Ill GENERAL CIRCUIT DIAGRAM A 5 IV DC CONTROLLER A 6 V SAFETY CIRCUIT A 11 VI HIGH VOLTAGE POWER SUPPLY A 12 VII INTERFACE...
Page 115: ...nd operate CSENS1 DRUM SENSITIVITY IDENTIFICATION signals Indicate the sensitivity of the photosensitive CSENS2 drum DBAC DEVELOPING BIAS AC DRIVEcommand Causes bias voltage to be applied to DBDC DEVE...
Page 116: ...rate PPRDY PRINTER POWER READY signal Indicates that the printer power s ON ROY READY signal Indicates that printing is possible REGD REGISTRATION ROLLER CLUTCH SOLENOID Causes the registration roller...
