Copier Tip ArchivesFor more current information, use the Bulletin Boards.

GENERAL

CLEANING TOOL FOR MIRRORS Everybody has been asking how to clean the hard to reach mirrors on copiers e.g. Canon1215/1500/2020/2120 etc. Canon advised that you use a Mirror Cleaning Tool. You can actually fashion/makeyour own tool. The tool is about 4 to 5 inches long and has a curve on both ends and both ends has a foam/ora smooth cloth on it. If you have a Canon Np 1500 manual it is on page 4-7. Using this tool will solve a lot ofyour copy quality problems.

REPLACING FUSER FILMSBe aware when replacing Canon fuser films that the ends are different and installing backwards will cause youwasted time and/or travel. Case in point: installed a new film on Canon C200D. The film has a brown band onone end. This end is wavy and not cut straight. This end is designed to go at the end where the trackingsensor is. It reads the back and forth movement of the film to adjust the tracking solenoid. Installingbackwards ( straight cut end ) will cause immediate tracking faults and adjustment will be ineffective. Hopethis saves someone else from having to do it twice.

ULTREX CONNECTORSIn the process of trouble-shooting an electrical problem, ultrex connectors need to be checked. Theseconnectors fit over the pin base on a PCB. If you experience a problem with one of these connectors, thentake a file or micro-cutters and trim a small amount all the way around the bottom of the connector. This willallow the connector to fit further down on the pin base and give better connections.

The plating on the ultrex connectors used in Canons will flake off, causing cross connections. This will resultin any number of strange electrical problems which mimic PCB failures. If you have access to an ultrexconnector tool, which looks like a small screwdriver with a very thin two pronged end, insert it around eachindividual connection. This will clear out the cross connection caused by the flakes and tighten the connectoras well. Spraying the connector with contact cleaner an blowing it out works sometimes too.

LIGHT / UNEVEN COPIESA light or uneven copy can result from crud buildup on the doctor blade of the developer, (or toner, onmonocomponent machines) unit. To correct, vacuum out dev.section and remove doctor blade and clean .Adjustment is controlled by copper shims made onto doctor blade.

DRUM & BLADE CROSSOVERSThe drum and cleaning blade out of an A30 canon cartridge will fit straight into a np-1010 / np1020 copier. Thismeans a cartridge that runs out of toner at obout 3,000 will have a drum & cleaning blade the can see another1,700 in an np-1010 or 1020 Also the canon pc-850 drum and cleaning blade fit right into the np-6016 drumunit, so when the pc850 cartridge runs out of toner around 10,000 it still has another 40,000 left in it. Also thecharging roller is interchangable. The drum and blade also fit the np-6030 but you need to change the drumends. They pop out with a piece of rod about 5mm thick bent to an L shape.

SMALL DIAMETER DRUMSOn many Canon small diameter drums where the drive for the registration rollers is also supplied by the drum,the drive gear in the drum itself can sometimes spin freely causing paper jams in the registration area. Thesolution is to remove the gear and epoxy back into place. I have noticed this problem in 1010/1020's mostoften but have also seen it happen in 1820/2020/2120's and 6025/6030's any small diameter drums should besuspect.

CORONA WIRESWhen replacing spooled corona wire, instead of using a hex key like all the books say, I take a 6 or 7 inchpiece of coat hanger and form it into a J shape. It's much easier this way.

UNEVEN DENSITYSometimes you can fix this problem by sanding the DV Roller with a fine grit sandpaper. You must sand itevenly of course.

CFX-L4000/4500

I have found these machines to start to groan while printing. Canon has come out with a plastic piece to stickon the back bottom center of the machine. I personally have had no luck with this fix. What I do is fold up apiece of paper into a small square, about 3/32" thick and stuff it under the metal plate located under the backfold down door. What this does is pushes down on the "off white colored" floating seperation system enoughso that the rollers can't rub against it and cause the "groan/vibration". Make sure that you put the paper squarein far enough so that it doesn't interfere with the transportation of the paper from the cassette to the printerarea. I have about 30 machines in service right now with this fix and am getting no call backs for the noise.

CLC'S

CLC (All)I recently had a problem with a grainy, sandpaper image from a 350. After checking the obvious: i.e. Biasconnections, High voltage outputs, I started wholesale parts exchange with no resolution. A bulletin boardreader got me to go back to the bias. I found the bias was not turning on. I replaced the DC controller and thatsolved the problem. (Of course you should check the connections first)

COLOR BALANCINGWhen color balancing a Canon CLC,always make sure the optics and CCD assy's are clean (use Soap andwater- I use one drop of Ivory clear diswashing detergent in 4oz of water),then set LAMP in service mode tospecs,do WSAMP adjustment, then do CCD adjustments. It is very important that LAMP be set properly.

DRUM REPLACEMENTSWhen replacing the drum and cleaning blade in the CLC's especially in the CLC 200,300,350. Use paddingpowder on the drum and the blade, then sprinkle a little in cleaner assy behind the cleaning blade. When youthink you have applied enough padding powder to the system. Repeat the process again. It takes very littledrag for this cleaning blade to roll and wipe out the drum.

CLC 500Copier indicates connect printer,no dc voltage. Resolder dc p/s contacts or send pcb to hytec.

CLC 500/550When you get a code 110 (laser code) remove laser cover and check the window to the mirror. It gets abuildup that looks like little beads.Remove mirror and blow out with air.Be very careful with the mirror.Fixes theproblem 85% of the time.To fix the problem of build up in the window, make sure the lock for the laser is up and not touching the top ofmirror. Its hard to tell if its up all the way.

GP 200

GP 200 series canon copiers can't handle color pictures when duplexing. Any color pictures in a newsletter orjust printed by itself can cause the gp to lock up. Symptoms are the applications crashing, the gp 200 printled blinks forever and will not allow any more print jobs to go through. when the IP board has the 45.02 updatean E 675 code will occur have customers convert to black and white pictures before printing.

NP-120

COPY QUALITY

You can adjust copy quality resolution by backing off the primary wire and turning up the secondary. Play withthem until you get the desired result.

C-122 and NP6012Crooked copies, black line lead edge, and mis-registration

I will make something more proper but on the plastic rib guides in front of PS roller there is a two-tier level.Find some approx. 1mm thick or slightly lighter plastic cut to about 1" by 8.25" put two-sided tape on theback. Lay it on the rib guides down against the bottom of the high edge of the feed-in end. The paper mustslide easy on the plastic so it must be very smooth. This stops the crooked copies and mis-registration of thepaper. My experiment is brand new. FYI, the size of what I used was dictated by the plastic I had lyingaround. The length seems to be ok if a little narrow but not less than 7.5" long. It is possible the width couldbe longer or narrower but this works so far. I did try several ways some others worked and some failed. It helpsthat the one test machine I am working on is in the shop and has the problem quite badly. A couple of otherthings. The plastic I am using has 2/16 slots cut 1/2 deep in the 1" inch with and are facing the PS roller. I amnot sure these are necessary or they may be a necessity

NP-120/125

TEST COPYWait for 30 minutes after plugging in an NP120/125 for the Photo drum to warm up. The standby modemaintains it normally. This uses pressure fusion and funny toner.

NP-120 - 125

Problem: Partial Blank Copies. Canon 120-125 copiers will occasionally generate service calls for "PartialBlank Copies. This can be an intermittent problem but will produce a copy with a blank top from 1 to 4 inches.This is caused by melting foam seals on the blank exposure assembly. They turn into a gooey mess andcause the light blocking assemblies to stick. Solution: Remove the entire assembly and clean with a good solvent. Manually activate the solenoid to checkfor sticking, then replace. This fix should take about half an hour.

NP-150/155

CODE E3If you get a false E3 code you may be able to fix it by soldering a connection between the two main terminalson the board under the right hand side cover.

FUSERYou can increase the life of the fuser busings by rotating them 180 degrees when one side wears.

ELECTRICALIf the copier starts running by itself, flickers or general acts erratically, try soldering the connectors on the DCpower supply.

NP-270

WRINKLING PAPERProblem: Wrinkling paper out of the fuser unitSolution: There is an end feed guide plate just before the fuser rollers. Hard particles of toner build up on thisplate causing the paper to get caught and twist as it enters the fuser unit. Sliding the plate to the left willremove it. Then scrape it clean with a sharp edge tool or knife. This will resolve the problem.

COPY QUALITYProblem: allagator skin pattern on your copy.Solution: The number "2" Corona unit is shorting out. Rewire with Canon gold plated tungsten and replace the

blocks. Most of the problem comes from the rear block.

EXPOSURE LAMP FUSEProblem: Exposure lamp fuse keeps blowing.Solution: Clear or replace the filter in the cooling fan to the left of the optics unit, also confirm that the fan isturning.

VARIOUS PROBLEMSProblem: Noise dirty copies and toner spilling out of the cleaning unit. Solution: The toner used in this model will pack up in the cleaning unit and form very hard rock - like stones oftoner in the cleaning unit causing a bind up of the gear breaks on the back of the cleaning unit. Replace thegear and check the bushings on the cleaning unit drive shaft. Most of all befor you put it back in the machinemake sure that you dissassemble the entire unit and scrape out all of the hard toner.

E-3 CODESProblem: Erattic E-3 Codes. The older scanner clutches in this machine were known for slipping after 50Kcopies. Replace it with a new scanner drive unit.

E-O CODESProblem : Emergency E-0 code temporary fix due to a blown thermal switch in the fuser. Solution: When it is necessary to get the customer up and running while you are waiting for the thermal switchto arrive you can remove the old switch place it in a refrigerator freezer and it will reset itself.

COPY QUALITYSquiggly blank lines running down the length of the copy, black spots all over copy. Replace the number 2corona wire and gird with Canon gold plated wire.

C-300

Problem: Drive block gears stripping out (specifically the developer drive gears within this block assembly) Solution: Apply a drop or two of Ames typewriter oil on to the ends of the developer roller, and spin the oil intothe developer felt seals. Be careful not to apply the oil to the image area of the developer roller, if this happenspolish off the oil or finger prints with a dry Sontara wipe. The gear damage appears to be caused by anincrease in friction of the Developer unit rotating. Apply the oil and/or replace the felts approx. 60K. Empty thedrum used toner collection area every 60K as well.

NP-1010

COPY QUALITYLight copiesCheck to make sure that the springs that hold the dv unit to the drum are both in place.(Front and back).OPTICSThe last mirror is extremely hard to clean. To clean it you must access it from inside the machine. There are 4screws that hold up the slit glass holder. You must also remove the lamp assembly next to it. Be careful toreplace the mylar slit shield and the actuator correctly.BLANK COPIESIf you are getting blank copies try the transfer corona 90% of the time is the problem.

NP-155

WRINKLING COPIESProblem wrinkling copies. Replaced the usual upper and lower fuser rollers checked and adjusted for evenpressure between rollers. Still wrinkling. Solution was the paper drive roller on the transport immediately beforethe fuser assy was slipping. I had to remove the rubber roller off of the drive assy clean both inside and out andthen I double side taped the rubber to the drive roller so it couldn't slip anymore. Problem solved. Berny Buta(The Copier Doc)

RUNNING CONSTANTLYProblem: Copier running all the time, no panel lights, won't go into warm up.Solution: There is a brown 5 volt wire going to the power supply located on the top right side of the machine.The solder connection on the PCB under that wire breaks causing no 5 volts. Resoldering repaired theproblem.

NP-1020

PAPER FEEDJams Pre-RegistrationYou may need to add pressure to the Pre-Registration Roller Springs.

SCANNER PROBLEMSWhen powered up, the scanner does not initialize but scan motor can beheard turning. Motor trying to overdrive scanner to left.Clean the connector at the scan home sensor.

NP-1215

JAMMINGWhen copies slow or stall between drum and fuser, before replacing transport belts, try cleaning and lubing allthe shaft bushings on the bed.COPY QUALITYStreaksDV unit spacer rollers may be worn. Replace.PAPER FEEDCheat the interlock and watch the paper go through. If paper stalls or slows between the drum and fuser youprobably need to replace the transport belts.(Rule out obstructions first.)

NP- 1215/1520

UFR ResidueCleans off very easy with brasso

NP-1215/1520/2020/2120

UFR RESIDUEWhen the top fuser roller in the fixing unit gets covered in the residue left behind by the mono component toneruse a scotch bright plastic green kitchen scouring pad. It will clean that top roller like new in less than 1 min.

UFR RESIDUEIn regards to cleaning UFR's with green scrubby pads; STOP IT! The pad will still put tiny, unnoticeablescratches which will then collect the toner faster. It appears to be brand new but you will soon return to cleanit again. So save time and effort and replace the UFR, it only takes about 30 minutes.

NP-1218

DRUM DRIVEThe drum drive gear is made of plastic and some times breaks due to vibration from the DV unit. Change magroller and developer bearings and make sure nothing is binding the DV unit.

NP-1500

JAMS IN THE PAPER PATHAdjust vr 306 on main pwb or take out metal roller bar from the tranport belt section and coat it with rubbercoating or recoat tape.

1530/1550/2020/6020

Patchy copies and occasionally banging, insuffient pressure on the rear dev racking cam.Remove dev unit, remove right cover,undo two connectors on the front & rear of the paper inlet guide, removetwo screws front and rear that hold that guide in, and waggle out of the machine.You should now be able tosee the dev racking shaft,take out the single screw which holds the dev racking handle, you can now turn theshaft round to gain access to the sprung screw which holds the cam on,remove ,stretch spring andreassemble. Should take about 5 minutes.

NP-2000'S

NOISEBroken teeth occur on all 2000\3000 canons if the drum cavity is not emptied periodicaly due to the cleaningunit binding up and increasing drag on the drum. The first indication is usually a clicking noise.

NP-2015

Problem: Chain noise from main drive chain rubbing on plastic caused by worn plastic bushings at the fuserdrive side and the registration roller end. Solution: I've had great results replacing them with " oilite " bushings from other applications. Four bushingsare needed. The fuser end takes about 15minutes and the registration end about half an hour.

SKEWED COPIESCanon 2015 copiers that have a skew in the copy can be fixed by stretching the spring on the registrationroller on the end where image is shortest. Too much tension is causing the reg.roller to feed faster on that end.A small screwdriver wedged between to coils spreads enough to make a difference,though it may take two orthree adjustments to correct the problem.

COPY QUALITYBlurred image. Some times the fuser drive chain can become stretched. You can fix this problem by justremoving one link.

NP-2020

FALSE JAMSI HAVE FOUND THAT THE UPPER AND LOWER PAPER FEED SOLENOID HAVE FOAM PADS THATDEGENERATE TO A GUMMY TEXTURE THAT DOES NOT RELEASE QUICKLY ENOUGH THE CLUTCHCATCH THIS CAUSES THE 'D' FEED ROLLERS TO ROTATE TWO OR THREE TIMES, CLEAN THESE OFFAND MAKE SOME NEW PADS FOR THE SOLENOIDS FROM THIN FOAM MATERIAL WITH SELF STICK,FIGURE 260 ITEM 3 IN THE 2020 PARTS MANUAL. NO POINT BUYING A NEW SOLENOID.

LIGHT COPIESIf copier gives light copies intermittently, have seen several machines that mounting screws become loose ontransfer corona block which is attached to rear of transport assembly, causing intermittent loss of transfercorona voltage. Remove transfer unit and tighten screws. Check for deformed contact springs.

LIGHT COPIESWhen getting light copies check to be sure the tranport assembly lever is not going past it's stopping point. Ifit does the transfer corona (which is part of transport section) will sit about 1/8 of an inch below where it issupposed to, causing light copies. There is an adjustment under the blue/green lever that you can see if youremove upper cassette. Adjust it so the tranfer corona ass'y locks in just right. For some reason thisadjustment can wiggle its way out of position... probably from customers slamming transfer section back intoplace.

Scanner power flex cablesI recently had a call-back on a Cañon 2020 due to an open expose lamp thermofuse. Approx. 1k earlier I'dreplaced the scanner flex cable due to an intermittent open. Since the thermofuse is an intentionally weak link,

did getting hammered by dirty surges contribute to its demise? In the future I intend to replace the fuse whenreplacing flex cables! Cheap insurance!

NP-3000'S

NOISEBroken teeth occur on all 2000\3000 canons if the drum cavity is not emptied periodicaly due to the cleaningunit binding up and increasing drag on the drum. The first indication is usually a clicking noise.

NP-3025

DRUM DRIVEBroken teeth. DV unit binds and causes drum to freeze up, causing broken drum drive gear teeth. Replacebinding parts or entire DV unit as neccessary.

NP-3025/3525

SCAN PROBLEMSCarriage moves about one inch and stops, then you get a fault code. I've found this to be caused by the photo-interrupter on far right of the optics assy.

NP-3050

PRE-REGISTRATION JAMSCause: The spring on the preregistration sensor can get weak and allow the flag to bounce causing a jam.Solution: Wrap the spring around the flag one more time increasing the tension and stopping the bouncePAPER JAMSJams in vertical pass assembly. Some times the deck motor runs too fast. Replace the motor.COPY QUALITY

PAPER JAMSWith 10 bin staple Sorter attached, paper jams at the fuser. This is caused by the sorter pulling the fuser dooraway from fuser. I dont know why they mounted the bracket on the fuser door. You can fix this by putting a small washer behind the fuser to move fuser out to make the gears mesh.

NP3050

Light areas down one side of the copyCause: This can be caused by fuser oil vaporizing and migrating up and condensing on mirrors 2&3.Solution: Clean the mirrors with varsol, then Isopropyl Alcohol and then use glass cleaner to finish the job.Prevention of further occurances: You should put small pieces of black electrical tape over all of the smallholes in the deck over the fuser.

NP-3050, 4050, 4835, 3825

Black lines on copy, drum has white haze on it. Looks like drum lube. Replace drum blade. Beware of faultyblades from some places.

NP-3225

DRUM DRIVEBroken teeth. DV unit binds and causes drum to freeze up, causing broken drum drive gear teeth. Replacebinding parts or entire DV unit as neccessary.

NP-3525

DRUM DRIVE

Broken teeth. DV unit binds and causes drum to freeze up, causing broken drum drive gear teeth. Replacebinding parts or entire DV unit as neccessary.

NP-3725

SKEWED COPYIf 11x8½ copys are frequently skewed, check the rear hinge pin which holds the movable registration guide &lower reg. roller. It has a tendency to crack and become loose, causing a loss of pressure on the rear side ofthe reg. rollers. If pin is no longer available, you can swap it with one of the duplex refeed guide pins (they don'thave pressure applied to them). DRUM DRIVEBroken teeth. DV unit binds and causes drum to freeze up, causing broken drum drive gear teeth. Replacebinding parts or entire DV unit as neccessary.PAPER FEEDJamming may be caused by slippage of the one-way bearing on the feed roller shaft. Clean or replace asneccessary.

If paper starts to feed from cassette and then feeds back in, clean or replace clutch on separation roller shaft.

NP-3825

PAPER TRANSPORTTransport bed fan maybe worn causing jamming. Replace fan if neccessary.

NP3825/3325 NP4835

BLACK STRIPESBlack Stripes across the copy Original Illumination lamp blinks.Cause: The flexable power cable has fractured from being clamped too close to the end kinking it and notallowing enough slack. Solution: Replace cable making sure that it does not kink during the full travel of thescanner.Prevention: Check all of your Canon Machines for this problem and adjust the clamps to prevent kinking ofcable. The "Black" cable seemed to cause the most problems. Canon has since changed the cable to a betterone.

NP-4540

Problem: Copy very light with banding from front to back.Solution: The transfer corona assembly needs to be seated correctly after the corona wires are replaced. If it isnot this problem will occur.

NP-4835

E-80 CODEProblem: E-080 CODE after working on color developer changer unit.Solution: Replace Main PCB DC Controller if you unplug the color changer unit to service it and thenm plug itback in while the machine is pluged in the main PCB DC- controler will become defective

E080 CODE IN DISPLAYSolution: Sensor Q-5 in the duplexing unit gets dirty fast also goes defective faster that the other sensors.

Laser class 5000 "start again" message.This message is a paper timing error1. Check paper tray: Make sure that the guide is set for the paper loaded in the tray2. Clean the paper-detect sensors.3. Clean and inspect the clutches4. Check pcb connectors5. If problem still persists, it is probably the main board.

NP-6000

COPY QUALITYJitter on copies. Scan wheels are made of nylon and some times crack. Replace as neccessary.

NP-6012

1/2 BLANK COPIESWHEN THE CUSTOMER TRIES TO INSTALL THE TONER FOR THE FIRST TIME AND KNOCKS THEDEVELOPER OUT OF POSTION THIS WILL CAUSE HALF BLANK COPIES. WHEN REPOSTIONING THEDEVELOPER MAKE SURE YOU MAKE CONTACT WITH THE ANTENNA AT THE REAR OF THEDEVELOPER THIS WILL SOMETIMES BREAK AND THE UNIT HAS TO BE REPLACED.

E-210 CODESOn the 6012 the lens will not find home. More often than not it will only happen every other time the power isturned on. The problem is in the drive assembly. Just order a new one and be careful replacing it. It can be areal bear.

PAPER JAMSIf customer complains of jams at reg. roller, or finds no paper, check the exposure lamp.

NOISEIf you are stuck with an awful grinding noise when paper is being picked up from the cassette, look to makesure that the paper size plate (the one that sets the paper length) is in the proper position. If it is out, thepaper can slip back ans allow the pick-up roller to rotate against the cork on the cassette lifter plate. Thiscauses an awfull noies and jamming problem.

E000, E001, E002, E003 CODESTo reset these codes perform the following:Remove the front panel and be careful not to bend or break the flexiblecable connected to the panel and the DC Controller.Turn on the copier and short the jumper wires JP3 and JP4 on the dccontroller pcb with a screwdriver.The count ratio indicator on the control panel turns on 'F'. When 'F'is turned on stop shorting the jumper wiresTurn off copier and turn it back on and its then reset.

NP-6012f/6412fDoc-Feeder MalfunctionOk who had the bright idea of putting a feeder on a 12cpm machine? This is looking for problems.The most recent symptoms are not always recognizing paper in the doc-feeder. The cure I have been finding isthe gray communication wire in the back causing faulty erratic problems one way to make sure if this is it is towiggle the wire a little and see if the paper will get recognized. If so, just replace the wiring harness. I havereplaced 3 in the past month and it has solved erratic problems.

NP6012F/6412FProblem: These feeders have a problem of not recognizing a document when its placed in the ADF. It is NOTthe wiring harness as another tech tip described. Cause: The problem is in fact, caused by the micro switch located next to the left hinge of the feeder. Whenclosed, it still has a small resistance (around 6~8 ohms). Thissmall resistance causes erratic document detection errors. Solution: All that has to be done to correct this problem is to bend the micro switch actuator outward so whenthe hinge is closed, the switch is closed tighter.

NP-6016E007 CODEE007 Code indicates damaged fixing film, but often is caused by the rear of the machine latching completely

when clamshell is closed. This causes the gears that drive the film to not quite mesh, so the film doesn'tmove, or moves too slowly. This usually happens on ADF models, as they have heavier shocks for the ClamShell. Before replacing film, which is a pain, try pushing down on left rear corner of machine to see if it runs.

NOISEChatter Noise: I have found that the gear cluster for the manual bypass has a gear that rattles from side toside causing secretaries to curse you. Replace the whole gear assy and they will praise you once again!!!

E007 CODEE007 fixing unit fault in the uper fusing unit of a canon np-6016 needs new upper fixing belt or fixing unit.

NP-6016/Selex GR-1060 The "add toner" lamp blinks when toner is full.Check connector at the rear top of developing unit. This connector must connect the rubber blade assembly inrear side and through the rubber blade it must connect to the mag. roller in the front side. Sometimes whendev. roller felts and rubber blade was replaced, a little bit of toner dust lays on connectors and connection islost. At first, light copies come out and next, the add toner lamp comes on. Check this connection best withthe multi-meter.

6025 -30Paper feed problemsWhen getting intermittent paper feed problems the first thing to do is change all of the feed tires even if theylook good. After spending much time trying to find feeder jam causes, this usually solves the problem.

NP-6050DUPLEX JAMSCanon 6050 Duplex Jams are sometimes caused by the LTR size paper cutting into the user side deflector onthe fuser assembly (the white Duplex deflector wich is right after the fuser on the fuser drawer ass'y). Whathappens is that the deflector is designed with European paper in mind and the American size paper is a bitsmaller and causes it to cut into the front deflector and sometime this cut in the deflector causes the edge ofthe paper to catch and jam. To fix this I have been taken the deflector out and with a hack saw blade carefullycutting around the front and rear deflectors and twisting them off, therfore taking the two deflectors totally off.Canon has come out with a new deflector ( it is black in color ).

DOC FEEDER JAMSIf you find that the document feeder jams when using it to copy a 2-sided original check the pin on the rearside of the left paper feed flapper, it may of broken off. To fix this problem without having to worry about ithapping again drill a hole through the flapper the same size of the pin and glue a hex wrench cut to the samelength that the pin was. (Here is the key though, the hex wrench must be just slightly larger than the hole, thiswill prevent any chance of it coming loose.) I have had to do this to 6 NP6050's so far because the flapper hasbeen hard to get. However it works so well I will not be replacing the flappers.

Canon 6050 RDF jams, this is caused by the fact that the machines are designed with European size paper in mind andthat it is just a bit larger than US size paper. This causes the American size paper to cut into the front feedpaper ribs on the right side cover of the RDF . The paper is actually cutting into the rib and causes jams or theoriginals to get a dogeared edge. The fix for this is to snip off the front rib or ribs on the right side cover and filethem smooth.

NP-6050Always replace upper f. Claws when replacing fuser roller. Also replacing it @ mid life of original oem roller lifewill extend its life by 35-50 percent.

NP-6050Upper fuser roller interchangesCanon NP-6060 upper fuser r. can be interchanged w/6650 ufr.

6060Notice your copies are very light and putting the darkness up high or even putting the drum potential updoesn’t help. Try re-soldering your lamp regulator and you should if all things go right that you’ll need to adjusteverything right down again. Np 4835 HVTdc also gives similar problems and also dark bands on page. Do thesame thing. Re-solder joints. I find a lot of the time that this is the case with most PCB's "dry joints"

NP 6085RDF 6085 is the same as the 6050 therefore, they have the same problems. So see TIPS under 6050 RDF Jams !

NP 6521

EXPOSURE LAMP PROBLEMSFluorescent exposure lamp has a heater wrapped around it. The heater, which doesn't wrap all the way aroundthe circumference of the lamp, has a cut-out in the center of it to allow a sensor to detect lamp intensity. If theheater slips and blocks light to sensor then a E221 code or light copies may occur. If the heater twists on thelamp then uneven side to side density may result. Best fix is to use double sided tape to secure heater tolamp. Make sure cut-out on heater is aligned with the sensor and make sure heater doesn't cover the clear sliton the fluorescent exposure lamp.

NP 6521

If the shield on the scan lamp partially obscures the lamp sensor the machine will pause before copying. Afterpressing theprint button the lamp lights but the machine will pause for several seconds. It won't be as slow with the AE off.The fix is the same as the one for E221, tape the shield in the proper position. There's a tip in this sectionabout the right way to do it.

NP6650

Mystery JammingRemove the separator tires from the LCC, it has double feed preventionclaws at the top anyway. Also removethe lower fuser roller cleaning blade, if you are using a good quality web and a sleeved lower roller you don'tneed the blade. If the unit is in a well ventilated area remove the BIG ozone filter, don't remove if in a stuffyroom, the ozone exhaust will feed back in through the optics cooling vent and deteriorate seal and spongesover a period of time.

FUSER JAMSFor fuser jams on the 6650, make sure that the entrance guide to the fuser stays clean. Even a small amountof toner build-up will cause jamming, skewing etc.EXIT JAMSFor fuser jams at exit or in the inverter section especially when duplexing, check the latch pins that hold theexit door closed. If they are only slightly loose, this will cause jamming.LIGHT COPIESCause: Ozone deposits built up on Primary Corona Assy. this is the brown deposit that builds up on the gridand stainless steel shieldsSolution: I find that you can remove this film with a water based cleaner and then I spray in a light mist ofisopropal alcohol to remove the moisture (alcohol will cause the water to evaporate and dry faster) I do this asthe first operation of any PM to let the assy dry completely. This same operation should be done to both thepretransfer corona and the trans/sep corona assy. This will help the coronas to give even charge to their area.

NP-7000

COPY QUALITYJitter on copies. Scan wheels are made of nylon and some times crack. Replace as neccessary.

NP-7550

COPY QUALITYSkewed copies. Check front scan support roller. Loosen the retaining screw and rotate the roller housing tocorrect skew. PAPER FEEDClean clutch units if replacing paper feed rollers doesn't fix problem.

NP-7558

LIGHT JITTERSCheck rubber mirror mounts in optics. After a few years ozone causes these to turn into goo. One morereason to clean the ozone filters!

8000 SERIES

Problem: Machine shutting down erraticallySolution: There is a five volt power supply located in the rear upper left side of the machine. This goes intoshutdown losing your 5 volts. Replace and problem is solved.

NP-8000

COPY QUALITYJitter on copies. Scan wheels are made of nylon and some times crack. Replace as neccessary.

NP-8530CONTROL PANEL LOCKOUTIf the control panel on 8530s locks out, try cleaning the connectors on the control panel PCB and DCcontroller with Blue Shower or other contact cleaner.

NP-8530PROBLEM: In READY mode copier TURNS scanning lamp ON and LOCKS keys.DESCRIPTION: - Turn copier ON - Copier goes into WARM UP - After reaching 150 degrees INIT ALROTATION doesn't go ON - After reaching 170 degrees CONTROL PANEL begins blinking and SCANNINGLAMP stays ON. SOLUTION: Rear side (bottom center), there is a PCB shaped as a mirror L. There is a 24 pin connector at thebottom left of PCB. Sometimes the metal rear cove pushes wires from connectors and creates this problem.So simple, but I had this copier down for a month. I replaced power supplies( 5V and 24V), DC controller , etc)and cost me $200 in unnecessary board repairs. Live and learn!

NP-8550COPY QUALITYSkewed copies. Check front scan support roller. Loosen the retaining screw and rotate the roller housing tocorrect skew. PAPER FEEDClean clutch units if replacing paper feed rollers doesn't fix problem.

PC SERIES

CANON PC 6, 7 and 11: PROBLEM: Scanner fails to drive.SOLUTION: Bad solder on Scan Driver Board.

BLACK COPIESThe large black guide that holds the left side of the A15 or A30 cartridge in the machine has two plastic pinson the rear frame side. If one of these pins breaks, the guide can flex enough to cause the exposure slit on thecartridge to not come in contact with the tab that opens it as it is slid into the machine. The result is no lightcan strike the drum.

BLANK COPIES Do a half-way test. If there is no image on the drumremove the transfer corona. Check for cracks in the charge blocks wherethe wire goes under the covers. They can be repaired by cleaning theblock and attaching a piece of electrical tape over the bad spot.

COPY QUALITYSkewed image. Some of these models have a set screw on the end of the scan mirror assembly that wearsand may need to be adjusted occassionally to correct skew.

Blank copies. Check the drum ground contact and clean as neccessary.

Blank copies. HVT may need to be grounded more securely. You can do this by placing a star washer on ascrew between the HVT and the frame.

PC-3

SCAN PROBLEMSProblem: Clicking noise after scan reverse. Clutch wont switch scan direction.Solution: The scanner rail spreads out causing a lot of up and down play in the rail. This play causes thereturn micro switch not to get activated. You can replace the rail but I did find that the outside of the rail can besqueezed in slightly and the inner rail can be spread out to reaolve the problem.

PC-6,7

Paper JamPaper leaves tray about 1-2 inches and jams. After cleaning feed rollers but before changing them, take apiece of medium grit sand paper and sand the guides that the paper follows as it leaves the tray and goes intothe copier. Overtime, the paper can hit the same spot enough times to cut into the plastic and cause it tohang. Also seen this same problem on Sharp Z series copiers and HP printers.

PAPER FEEDIf paper keeps getting hung up right out of the tray, check the tray itself. Sometimes the plastic tabs that holdthe tray components (guides) in the tray break and don't hold them down anymore,so the snubbers release thepaper unevenly and it skews as it begins to feed. You can drill small holes and tie-wrap them back downagain.

POWER LOSSIf the copier intermittently shuts itself off or won't power up, check the fuser door. Sometimes the door getspulled open by the catch tray. Check that the latch is tight and tighten or repair as necessary. You can alsojust tell your customer not to use the catch tray as a temporary fix.

POWERS ON BUT STAYS IDLE AND DOES NOT INITIALIZEVery frustrating ! Scanner does not ever move or initialize which is the actual cause of the problem. Fuserdoes attempt to heat but only for a few seconds and never enough to come to ready. The cause for this is alack of ground between the Scanner drive transistor and the mounting plate. Remove the Scanner driver board(left rear of the machine) and scrape the transistor flat (metal) side where it grounds to the frame and also theframe itself. This will provide better contact for the scanner motor to drive and come to home position which isnecessary for the machine to properly initialize. Maybe use some conductive grease between the transistorand the frame ?

PAPER FEED PROBLEMSWhen having paper feed problems or broken tray, replace paper tray with tray from Canon PC 25 or PC 20.Works great !!!

PC-7,11BLANK COPIESI have had quite a few calls asking me to help them with the copier, they the cartridge in and close themachine and a blank paper comes out or after they cleared a jam, when they closed the machine again it gavethem a blank image. The solution to that is they should reopen the machine and take out the cartridge andreinsert to the snap (till the whare it wont go anymore) and try it again.

PC-20,25

BLANK COPIES90% of blank copies are usually caused by shorted Transfer Corona Unit,Remove Transfer Corona and run a test copy. A very faint copy will appear.

MORE BLANK COPIESBlank copies are more likely to be as a result of lamp regulator fault than psu.

Blank copies. If none of the usual stuff works, try replacing the whole transfer corona assembly.

Blank copies. Could be bad DC power supply. Replace if neccessary.

If you suspect the D.C. power supply, put a star washer between the D.C. P.C.B. and the frame it's mountedto.Subject: Canon pc 20/25 blank copies

PC-25

ELECTRICALProblem: Erratic electrical activity. Panel flashing & shutting down and jams.Solution: On the right side of the machine is a small power supply with a circuit breaker on it. The groundcontact on the bottom of the board connecting to the frame needs to be scraped and placing a toothed lockwasher between the board and the frame tightly secured resolved the problem.

COPY QUALITYBlank streaks on copy running down the length of the paper. Transfer unit wire is new. The Varistor connectedto the transfer unit shell need to be replaced. Make sure all contacts are very clean.

PC-65

WHITE BANDSProblem : Pure white bands approx. 1" wide, lead-to-trail, on both sides (LTTR.).Cause: Drive pin (black plastic) [protrudes skywards].Solution: Needs realignment with drive channel (provided by the lens driver assembly).

PC-720 THROUGH 790 (POSSIBLY 850)LIGHT OR BLOTCHY COPYBlotchy Copies: Change transfer corona roller (do not clean or touch)Light Copies : Repair or replace power supply board # FG5-4826. (bad soldering) And re-adjust lamp and AEsettings.

PC-740/770Jamming @ Registration AreaFound both Canon PC's with feed problems. Would start to pass paper but would stop @ registration roller.Traced to exposure lamp burnt on only 1 end. Replaced lamp #FH7-3272 fluorescent lamp & problem wasresolved.

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