Lexmark Optra S 1620 Manual
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Diagnostic Aids3-28 4059-XXX the hot roll increases. The thermistor resistance changes from approximately 150K ohms to approximately 260K ohms as the temperature of the fuser hot roll increases. The thermistor is connected to the fuser control board connector J2-1 and J2-2 and from J2 to J1-2 and J1-3 on the fuser control board to J2-6 and J2-7 on the engine board. J2-6 (TEMPIN+) and J2-7 (TEMPIN-) are connected to module PLCC U9. U9 monitors the change in thermistor resistance and sends a signal (HEATON) from J20-A25 through the interconnect board to CN3-9 on the LVPS to signal the triac to turn the fuser lamp On or Off to maintain the correct fuser temperature. The voltage drop across the thermistor is proportional to the fuser temperature and varies from approximately 2.0 V dc (cold) to 2.3 V dc (warm during idle) to approximately 2.7 V dc during continuous printing. These voltages are assuming the fuser temperature is set to normal. The HEATON signal from CN3-9 varies from 0 V dc (lamp On) to +5 V dc (lamp Off) and is connected to the cathode of an Opto triac to control the fuser lamp. The second part of the assembly is the fuser frame which contains the hot roll, backup roll, and associated parts as well as the paper exit guide assembly, narrow media sensor, fuser control board (which has the exit sensor mounted on the board) and the envelope conditioner solenoid on the model 2420, 2450, 2455, 3455, 1620, 1625, 1650 and 1855. The model 2420, 2450 and 2455 printer fuser temperature is 200.8 degrees C while printing at 600 dpi and 163.9 degrees C while printing at 1200 dpi. The model 1620, 1625 and 1650 printer fuser temperature is 185.5 degrees C while printing at 600 dpi and 145.5 degrees C while printing at 1200 dpi. The model 1250 and 1255 printer fuser temperature is 206.9 degrees C while printing at 600 dpi and 151.5 degrees C while printing at 1200 dpi. The model 3455 printer fuser temperature is 270 degrees C while printing at 600 dpi and 170 degrees C while printing at 1200 dpi.
3-294059 Service Manual 4059-XXX Paper Feed Jams Paper Jams - Base Printer Error Message 200 - Paper Jam - Remove Cartridge This message indicates that paper is jammed at the printer input sensor. This condition can be caused by the paper jamming prior to activating the input sensor flag, the sensor not detecting paper over the sensor or paper arriving at the sensor too late. Error Message 201 - Paper Jam - Remove Cartridge This message indicates the paper is jammed between the printer’s input and exit sensors. This condition can be caused by the paper exiting the input sensor too late or jamming in the fuser assembly prior to activating the exit sensor flag in time or not at all. Error Message 202 - Paper Jam - Open Rear Door This message indicates the paper is jammed at the printer exit sensor. This can be caused by the paper arriving at the sensor too late, the paper is jammed in the fuser assembly or is jammed exiting the fuser assembly in the redrive assembly or the exit sensor flag is not operating correctly. Paper Jams - Options Error Message 230 Paper Jam - Check Duplex The paper is most likely jammed in the duplex unit, however the paper can also be jammed in the redrive at the input to the duplex option. The redrive assembly may not be correctly installed or locked in position or the duplex link is bent and not aligned properly to allow paper to feed correctly into the duplex option. Error Message 24x (x=Tray 1 through 5) Paper Jam Check Tray x. The paper has not cleared the pass through sensor or reached the pass through sensor of the option above tray x.
Diagnostic Aids3-30 4059-XXX Error Message 250 - Paper Jam - Check MP Feeder The paper is jammed in the multipurpose feeder and has not reached the base machine input sensor or has not reached the input sensor in time. Error Message 260 Paper Jam - Check Envelope Feeder An envelope is jammed in the envelope feeder or has not reached the base machine input sensor. Error Message 27x Paper Jam - Check Bin x. Paper is jammed in output bin x (X=bin 1 thru 3). Generally this message appears when the paper has not cleared the exit sensor in time, has jammed in the redrive assembly or has not fed into the output bin selected.
4-14059 Service Manual 4059-XXX 4.Repair Information WARNING:Read the following before handling electronic parts. Handling ESD-Sensitive Parts Many electronic products use parts that are known to be sensitive to electrostatic discharge (ESD). To prevent damage to ESD-sensitive parts, follow the instructions below in addition to all the usual precautions, such as turning off power before removing logic boards: •Keep the ESD-sensitive part in its original shipping container (a special “ESD bag”) until you are ready to install the part into the machine. •Make the least-possible movements with your body to prevent an increase of static electricity from clothing fibers, carpets, and furniture. •Put the ESD wrist strap on your wrist. Connect the wrist band to the system ground point. This discharges any static electricity in your body to the machine. •Hold the ESD-sensitive part by its edge connector shroud (cover); do not touch its pins. If you are removing a pluggable module, use the correct tool. •Do not place the ESD-sensitive part on the machine cover or on a metal table; if you need to put down the ESD-sensitive part for any reason, first put it into its special bag. •Machine covers and metal tables are electrical grounds. They increase the risk of damage because they make a discharge path from your body through the ESD-sensitive part. (Large metal objects can be discharge paths without being grounded.) •Prevent ESD-sensitive parts from being accidentally touched by other personnel. Install machine covers when you are not working on the machine, and do not put unprotected ESD- sensitive parts on a table. •If possible, keep all ESD-sensitive parts in a grounded metal cabinet (case). •Be extra careful in working with ESD-sensitive parts when cold- weather heating is used because low humidity increases static electricity.
Repair Information4-2 4059-XXX Adjustment Procedures Duplex Motor Drive Belts Do the duplex motor belt and drive belt adjustment whenever you remove or replace the duplex motor or loosen the motor or drive belt idler pulley. Service Tip: Excessive belt tension can result in stalling the duplex motor. Too little belt tension can result in belt slippage. To do the duplex drive belt adjustment: 1. Do the removal procedure“Duplex Front Cover Door” on page 4-21to access the drive belt idler pulley. 2. Loosen the idler pulley mounting screw and position the idler to provide 3 mm (±.5 mm) drive belt deflection. 3. Tighten the idler pulley mounting screw being careful to maintain the adjustment. 4. Reassemble the duplex unit. To do the duplex motor belt adjustment: 1. Do the removal procedure“Duplex Motor” on page 4-22to access the motor mounting screws but do not remove the motor. 2. Loosen the screw in the elongated adjustment slot and position the motor to provide 3 mm (±.5 mm) motor belt deflection. 3. Tighten both mounting screws being careful to maintain the adjustment. 4. Reassemble the duplex unit.
4-34059 Service Manual 4059-XXX Fuser Solenoid Adjustment Perform the fuser solenoid adjustment whenever you replace the fuser solenoid. Adjust the fuser solenoid while installed in the printer. Adjust the screw on the eccentric mounted on the solenoid housing to provide an air gap between the rear of the solenoid stator and the solenoid armature. Gap Adjustment The gap adjustment allows you to increase the minimum gap between sheets of paper as they are fed through the printer. This adjustment does not reduce the printers overall performance such as pages per minute but can help in reducing the amount of curl of some printed media thus improving media stacking in the output bin. 1. Enter the Diagnostic Mode 2. Select EP SETUP from the Diagnostic Menu. 3. Select GAP ADJUST 4. The range of the GAP adjustment is 0 to 255. Adjust the gap setting by using the Menu < > button to select the value. If GAP=0 displays, it indicates a factory setting to minimum gap. Select a value and run several copies of the media that displays a curl problem. It may take several tries before improvement is noticed. Note:This setting has no effect when printing in duplex mode. Printer Model Solenoid Air Gap 2420/2450/2455 4.4 mm (.170 inch) 1620/1625/1650/1855 3.9 mm (.153 inch) 3455 4.8 mm (.153 inch)
Repair Information4-4 4059-XXX Printhead Assembly Adjustment Do the printhead assembly adjustment whenever you remove or replace the printhead assembly or loosen the mounting screws. Install the new printhead with the three mounting screws centered in the slots in the printhead frame assembly. Leave the screws loose enough to allow the printhead assembly to move from side to side within the slots. It is necessary to perform a registration adjustment before locking down the three printhead mounting screws. To perform the registration adjustment: 1. Turn the printer off. 2. Press and hold: Return and Go. 3. Turn the printer On and release the buttons when “Performing Self Test displays. 4. Select Registration from the menu. 5. Select Quick Test Page. The test page should only be printed on letter or A4 paper from Tray 1. The Quick Test Page consists of alignment diamonds, horizontal lines that can be used for skew adjustment, page count setting, printer serial number code levels and print registration settings. 6. Check the Quick Test Page for any sign of skew by checking the diamonds at the top left and top right of the test page for equal distance from the top of the page. If any adjustment is necessary, adjust the left or right printhead mounting screws and check the skew again by running another Quick Test Page. This procedure may take two or three attempts before you get satisfactory results. 7. When you have the correct adjustment, gently tighten the printhead mounting screws being careful not to move the printhead assembly.
4-54059 Service Manual 4059-XXX Paper Alignment Assembly Adjustment Do the alignment assembly adjustment whenever you replace the alignment assembly. Always print a copy of the Quick Test Page before making any adjustments to the alignment assembly reference adjustment screw. When replacing the alignment assembly, it is necessary to back the reference adjustment screw out far enough to remove the old assembly and install the new one. If you are replacing the alignment assembly go to step a. If you are only adjusting the reference adjustment screw go to step b. a. Print a copy of the Quick Test Page and check the margin adjustments printed on the test page. These settings should be within the range specified in“Print Registration” on page 3-18. Do the reference adjustment if you are sure the margins are set correctly. 1. Loosen the locknut on the inside rear of the alignment assembly. 2. Remove the two screws holding the alignment assembly to the left side frame. 3. Back the reference adjustment screw out far enough to allow the alignment assembly to be removed from the printer. It is not necessary to completely remove the screw. 4. Install the new alignment assembly. Turn the reference screw clockwisewitha7mmnutdriveruntilittouchesthebackofthe reference plate and tighten the nut with a 5.5 mm wrench. The reference adjustment screw can be adjusted without loosening the nut. Turn the screw clockwise a few turns and print a copy of the Quick Test Page as you check the diamonds on the left margin. Continue adjusting the screw as you check the results of each adjustment on a new test page until you obtain the results you want.
Repair Information4-6 4059-XXX b. Print a copy of the Quick Test Page and check the margin adjustments printed on the test page. These settings should be within the range specified in“Print Registration” on page 3-18. The reference screw can be adjusted without loosening the locknut. Turn the screw a few turns and print a copy of the Quick Test Page as you check the diamonds on the left margin. Continue adjusting the screw as you check the results of each adjustment on a new test page until you obtain the results you want.
4-74059 Service Manual 4059-XXX Screw Identification Table The following table contains screw types, locations, and quantities necessary to service the printer. Each screw callout in the removal procedure graphic displays the screw reference number listed in the table. Pay careful attention to each screw type location when doing removals. You must install the correct screw type in each location during reassembly. Reference NumberScrew Type Location Purpose Qty M3.5x8 mm Thread Cuttingright side frame to center panattach 1 toner level sensor mounting 1 charge roll mounting 1 main drive gearbox mounting 3 EP module to left and right side frameattach 9 developer drive assemblymounting 2 left side cover gap to left frameattach 2 stacker duct to frame mounting 2 cartridge hold down assemblymounting 2 MPT deflector mounting 2 fuser to frame mounting 2 interconnect board shield groundattach 2 engine board shield to frameattach 1 laser cover mounting 5