Previous Page. Next Page. Laser printer - duplex copier - color network scanner - super g3 fax pages. Page 3 All service persons are expected to have a good understanding of the contents of this Service Manual and all relevant Service Information bulletins and be able to identify and isolate faults in the machine. Relation Between Scanner D. Blank Assembly Basic Scanner Operation.. Pick-Up from the III. Pick-up Assembly Feeder Assembly Adding Toner A-1 C. A-3 D. External View If thin paper or OHP film, feed one sheet at a time.
Drum cleaning 5. Transfer Multifeeder Copy delivery 6. Separation Registration 7. Basic Sequence of Operations B. Outline of Electric Circuitry Inputs to DC Controller.. VR See p. III: Same as I. Dry wipe the scanning lamp if it is soiled. If they are loosened, re- adjusting the mirror mechanical axis is not possible in the filed. Corona System Development System..
High-voltage transformer goes OFF. Variable pulse width oscillator goes ON. High-voltage transformer goes ON. Also, the output of the AC high-voltage transformer is rectified and supplied to the static charge eliminator approx. Hold the toner cartridge, and pull on the seal to the front until it stops. Tap lightly on the top of the toner cartridge until all toner has fallen into the developing assembly.
Remove the toner cartridge, and keep it in an empty box. Close the developing assembly lid, and slide the assembly inside until it stops. Turn the developing assembly lever clockwise to engage it.
Close the front cover. Remarks Check that copies are made without a problem and the non-image width along the leading edge is correct; otherwise, make adjustments. Non-image width: 2. Do not touch the drum; if its surface is soiled, wipe off the dirt using a flannel cloth coated with toner. Do not use paper, lint-free or otherwise, or never use a dry cloth or solvent. Universal Cassette Code Setting "" By means of this program, it is possible to set the paper size to universal cassette code.
Active service program by pressing "Sorter" key. The universal paper size code is indicated on the control panel display "0 to 6". Note: The settings in the above table are enabled when the knob selector in the cassette is in "U" position. Step 1 2 3 4 5 Work Remove the drum unit. Fix the scanner, and mirror carriage in place. Tape the corona assembly release lever in place against vibration.
Tape the front door and delivery assembly. Place a sheet of A3 paper on the copyboard glass, and tape the copyboard cover. Check Remarks Put the drum unit in a separate box for transport.
Fix the No. Figure 3 Set the control card main unit [1] and fix it to the control panel with four screws [2]. Figure 5 Connect the relay cable [1] to the control card connector [2] and the control panel PCB connector [3]. Although the deterioration of a part may not be visible, it can seriously hamper the performance of the copier if not replaced on schedule. Parts should be replaced during the regular service visit that is closest to the end of the service life of the part.
Table Note: The above values are estimates and are subject to change depending on future data. DURABLE PARTS The values shown in the table below indicate the expected average life number of copies of parts which may require replacement at least once during the warranty period due to deterioration or damage but which can be simply replaced in order to restore the performance of the copier. Perform periodic servicing after every 15, copies, as a general rule. Before making a service call, check the service log and take along any replacement parts that are likely to be needed: No.
Record the counter reading. Check Condition of copier Number of miscopies a. Image density b. Dirty background c. Clarity of letters d. Leading edge blank area e. Left and right margins f. Fixing, synchronizing, and soiling of back g. Unusual noise h. Operation of counter Remarks. Clean the corona assemblies.
Clean separation feeder assemblies. Clean fixing and delivery assemblies. Paper guide plate Separation claws upper and lower Perform the periodic servicing appropriate to the number of copies. Clean the copyboard cover and the copyboard glass. Check the amount of waste toner. Make test copies. Make sample copies. Select sample copies to keep for the users record. Clean up around the copier. Record the final counter value. Fill in the service sheet and check out with the person in charge.
Transfer guide Feeder belt Feeder frame Scanning lamp reflector Scanning lamp side reflector Mirrors 1 to 6 Lens Dustproofing glass Primary corona assembly Primary corona wire Transfer corona assembly Transfer corona wire Static charge eliminator Spacer rollers front and rear Upper fixing roller Lower fixing roller Paper guide plate Separation claws upper and lower Lower face of drum unit.
Clean with alcohol. Replace yearly. Clean with alcohol then apply high viscosity lubricating oil TKN Damp cloth Clean with a blower brush. If very dirty, clean with alcohol. Clean mirror 6 with the mirror cleaning tool. Dry wipe using lint-free paper; then clean using alcohol.
Guide to Troubleshooting Tables The troubleshooting procedures in this manual are prepared in the form of tables, rather than flow charts. Study the following for an idea of how to consult the tables. AC power is absent. Are the front door and delivery cover closed property?
Is the specified voltage present at the power outlet? Is the specified voltage present between J and J? J1 is located near the power supply cord mount. Close the door and cover. The problem is not the copier's; advise the user.
Go to step 6. In the case of "AC power is absent," you will learn that the power plug may not be connected, the covers may not be closed properly, or the main power may be absent.
Image adjustment should be performed using the following settings: 1. Manual non AE exposure 2. Density cursor setting : 5 3. Make this adjustment with the upper front panel and front door installed. Is there a difference in density on the near and far sides of the copies? YES Is there a difference in density in the image area of a reduced copy? Is the density of gray scale No. See Note 3. NO Is the density of gray scale No.
NO Turn the copy density knob clockwise. Note 2 The image will become lighter. See Note 4. Turn the copy density knob counterclockwise. Note 3 The image will become darker.
Check the following : 1. Differences in density between the near and far sides of the copies. Density of gray scale No. Fogging in blank areas. Is the top margin of the copy at copy density 1 within the standard? NO Adjust Service mode See p. YES Make one copy.
Mount the drum unit and make one copy. Note 1 : The distance between the grid and photosensitive drum is determined by the spacer mounted on the grid. Check for deterioration or damage to the spacer.
This changes the developing bias, but not the intensity of the scanning lamp. Note 3 : No. Turning the copy density knob clockwise too far past the proper position will result in fogging in blank areas.
If dirt cannot be removed with a blower brush, clean with alcohol. Leading Edge Non-Reproduced Area There is a white strip on the bottom of the copyboard glass in the position shown in the figure below. If bias is being applied to the grid of the primary corona while the scanner is passing over the white strip, the leading edge of the copy will be reproduced blank. If the leading edge nonimage width is outside the standards, adjust the timing at which the grid bias goes from OFF to ON in the service mode C3.
White strip. Leading Edge Registration Make adjustments in the service mode C2 so that the distance shown is Note: Adjust the leading edge non-reproduced area before making this adjustment. Figure A higher setting in the service mode C2 increases the leading edge margin. Figure Loosen the two screws, and adjust the latch assembly for the cassette found on the back of the bottom plate by sliding it.
Screws Feeder release lever. Figure Loosen the screw, and adjust the multifeeder side guide by sliding it. Then, tighten the screw. Installing the Lens Drive Cable This unit has been accurately adjusted at the factory with special gauges. Do not remove parts other than those shown below, nor loosen any other screws.
Figure a. Mark the positions of the pulley fixing base and the wire fixing piece with a scriber. Remove the two screws keeping the pulley fixing base. Remove the cable. Attaching the Lens Cable 1 Remove the two screws keeping the lens pulley fixing plate, and remove the lens pulley. Adjusting the Tension of the Scanner Drive Cable Move the mirror 1 mount to the home position start position. As shown in Figure , pull at point [A] approximate center of the free cable with a spring gauge so that the cable lengths touch each other.
If the reading on the spring balance is not about 1. Adjust the position of the scanner mirror 1 by altering the tension of the scanner drive cable. Loosen the cap screws. For reference: 1. The cable will stretch after a large number of copies have been made, making readjustment necessary.
An incorrect distance between mirror 1 and mirror 2 will cause an incorrect side-to-side reproduction ratio and poor focus, resulting in poor sharpness and fuzziness in the copy image. Figure 2 Make a copy of the paper with the lines marked on it. A 3 Place a blank sheet of paper on the copyboard and feed the marked sheet of paper into the copier.
Use manual feed. B Passing the sheet through the copier indicates the amount of shrinkage due to heat. If the lines on the right do not match, adjust the position of the scanner so that the dimensions x and y equal. For reference: If the distance between the mirrors is short, the image will be enlarged. If the distance is long, the image will be reduced.
Check the copy ratio. If the copy ratio is not appropriate, perform the following steps: Enter service mode C10 lens home position adjustment. The - key moves the lens position for enlargement 0. If the copy ratio is appropriate, go to c. If the copy ratio is not appropriate, perform the following steps: Enter service mode C11 mirror home position sensor adjustment. The - key moves the mirror position to the right by 0. If the copy ratio is appropriate, go to d. The - key moves the mirror and lens position for enlargement 0.
If the copy ratio is appropriate, go to e. If the copy ratio is not appropriate, repeat step 4 and later. Adjusting the Tension of the Belt The main motor drives the drum via a timing belt. Adjust the tension of the belt by selecting the mounting hole of the main motor so that when the center of the timing belt is pushed down with a force of g, the distance between the two runs of the belt is between 20 and 25 mm. Main motor mounting holes Tension decreases Spring scal g Dimension 20 to 25 mm.
Installation Position of the Transfer Guide When installing the transfer guide, ensure that the clearance between the transfer assembly roller and the photosensitive drum is about 1. Installation Position of the Scanner Drive Assembly Loosen the four screws of the scanner drive assembly; then, while pushing the scanner drive assembly against the rear plate direction of arrow [1] , move it in the direction of the manual feed tray direction of arrow [2] so that it touches the pulley base and the lens gear.
In this condition, tighten the screws, and confirm that there is play between the lens gear and the gear of the lens drive capstan. Pulley gear Pulley base Lens base. Figure Figure The corona wire must not be bent or twisted, and the gold plating must not be peeling off. The corona wire must not be slack.
The length of the corona wire tension spring should be about 12 mm. The corona wire must be in the V groove of the height adjusting piece. Figure Note: The height position of the corona wire of the primary and transfer corona assemblies can be adjusted by turning the screw at the back of the corona wire. Turning the screw once causes the height of the corona wire to change by about 0.
Adjusting the Fixing Assembly Roller Pressure adjusting the nip width The nip width should conform to the dimension shown in Table Adjust the nip width with the bolts if it is out of standard.
Measure after the upper and lower rollers have been adequately heated. Wait for 15 minutes; then make 20 copies, and measure the nip width.
Measuring Procedure 1 Open the copyboard cover and make an A3 size solid black copy. Degree of Arching multifeeder Make the following adjustments if the copy paper picked up from the multifeeder moves askew or wrinkles are noted on the leading edge of the copy paper; the adjustments are made by changing the degree of arching of the copy paper between the multifeeder pick-up roller and the registration roller.
Figure 6 Turn the copier ON, and select C4 in the service mode. Note: A higher setting increases the measurement, i. VRs and check pins not listed here are used only for factory adjustments, which require special tools and measuring instruments, as well great care and precision. Do not attempt to adjust such parts. Notes: 1. VRs which can be adjusted in the field VRs which should not be adjusted in the field For reference:.
The scanning lamp will go OFF, and the scanner will return to the home position. Copy density. Document density Test sheet Sheet of newspaper When the setting is lowered. When the setting is raised. Then, perform the adjustment below. Check the exposure; if it is not satisfactory, perform the following: Enter service mode C Check the exposure; if the density is not satisfactory, perform the following: Enter service mode C Checking Photointerrupters No.
Arm raised: voltage approx. When the light-blocking plate is in Q4: voltage approx. Scanner in HOME position: voltage approx. When opening the door: voltage approx. With paper in Q4: voltage approx. Checking the Installation Environment a. The copier should not be installed in a hot or humid location such as near a water faucet or humidifier , a cold area, near an open flame, or in a dusty location.
Do not install the copier in a location where ammonia gas is generated. Do not install the copier in direct sunlight. If such a location is unavoidable, install curtains or other means to block out sunlight. Install the copier in a well-ventilated location. Install the copier where it can be set level. Checking the Original Determine if the trouble is due to the original or a malfunction of the copier.
The copy density lever should normally be set to 4. Check if the original has a background color, such as yellow, which causes poor contrast. Check the density of the original. Examples: Originals which are diazo copies or transparent originals: Copies are likely to be mistakenly judged as being foggy.
Pencil originals: Copies are likely to be mistakenly judged as having a light image. Checking the Copyboard Cover or the Copyboard Glass If the cover or glass is dirty, clean it with a mild detergent or with alcohol.
If there is damage, replace the damaged part. Checking Corona Assemblies a. Check for dirt on the corona assemblies or abnormalities such as scratches on the corona wires. Clean the corona wires and wire shield plates of each corona assembly. Replace the wires if the dirt cannot be removed.
Ensure that each corona assembly is installed correctly. Make sure that the corona wire tension springs are not rusted. Checking the Transfer Feed Guides If the transfer guides or feed guides are dirty, clean them with a moist cloth.
Check the Copy Paper a. Is copy paper recommended by Canon being used? Has the copy paper absorbed moisture? Open a now package of copy paper and make copies, then compare the copies. Others When a copier is brought in to a warm room from a warehouse or other cold area in winter, particularly when it is being installed, condensation may form inside the copier and cause various problems.
Examples of problems: a. The copy image may become light due to condensation in the scanner lens, mirrors, etc. The drum may be cold the electrical resistivity of the OPC will be high , causing the contrast to be low. Current leakage from the coronas may occur. Paper may jam or fail to be fed satisfactorily due to condensation on the pick-up and delivery guide plate. The friction of the lower manual feed paper pick-up roller may be reduced, resulting in unsatisfactory paper pick-up.
If condensation occurs in the copier, switch the copier ON and leave it to stand for 10 to 20 minutes. If a cartridge in its original sealed wrapping is taken from a cold place to a warm place and then immediately unwrapped, condensation may form on it, resulting in image problems.
To prevent this, instruct the customer to leave the cartridge sealed in the room for a sufficient period to allow it to reach the temperature of the room between one and two hours before unwrapping it. Note: When detects such as uneven density differences in the density on the near and far sides of the copy , lightness or fogging occur first make the adjustments outlined in Basic Image Adjustment Procedures. NOTE: The samples are created intentionally.
Troubleshooting of Image Faults Light image halftone areas only Procedure 1 Check Does the image quality improve after the basic adjustment procedure is followed? Is the image lighter is when a copy is made using AE? Is the image lighter when a copy is made using a black developing assembly? Result Yes Yes Yes End.
Perform AE adjustment. Check that J and J of the black developing assembly are connected by a jumper wire. If they are not, connect them. Replace the drum unit.
Switch the copier OFF during copying and open the front door. Does the toner image on the surface of the photosensitive drum prior to transfer appear normal? Are the corona and grid wires of the transfer corona assembly installed correctly, and is the corona wire height normal? Result Yes No End. Perform step 6 and subsequent steps. Lower transfer assembly guide plate Varistor High-voltage transformer DC controler PCB Developing unit pressure applying mechanism Amount of toner in developing assembly.
Is the developing roller of the developing assembly pressing against the photosensitive drum? Is the surface of the developing cylinder coated uniformly with toner?
Install the corona wires correctly. Adjust the height of the corona wires. Clean the corona wires. Install the corona assembly securely. The paper may have absorbed moisture, so instruct the user about the correct method of storing paper. Explain to the user that if paper not recommended by Canon is being used, the image quality may be slightly poorer.
Check if the lower transfer assembly guide plate is touching the spring of the feeder wait. Replace the varistor. Check the pressure applying mechanism of the developing assembly. If the problem is in the CT unit, replace the CT unit. Check if the developing bias is being supplied to the developing cylinder. Uneven density front side dark Uneven density front side light Procedure 1 Check Does the image quality improve after the basic adjustment procedure is followed?
Is the spacer roller of the developing assembly pressing against the photosensitive drum? Does the image improve after the scanning lamp, reflectors, side reflectors, lens and dust-proofing glass are cleaned?
Remove the covers as necessary to clean, inspect, or repair the inside of the copier. The right side works sometimes and sometimes doesnt.
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