Lexmark C 746 Service Manual
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Repair information4-205 5026 Go Back Previous Next Photointerrupter sensor with cable assembly removal 1.Remove the high-capacity input tray (HCIT) right cover. See “HCIT right cover removal” on page 4-196. 2.Disconnect the photo interrupter sensor cable connector (A) from the HCIT controller board. 3.Turn the drawer rear side down, and use 4.0 mm wrench to remove the four Allen screws (B) securing the counterweight to the rear frame. Warning: Do not remove the screws without turning the drawer rear side down first. The counterweight is very heavy; it might fall and cause damage. A B
4-206Service Manual 5026 Go Back Previous Next 4.Remove the screw (C) securing the sensor to the rear frame, and then release the hooks (D). Note: Remove the cable from the restraint, and observe the routing for reinstallation. 5.Remove the photo interrupter sensor with cable assembly. Top plate assembly removal 1.Remove the high-capacity input tray (HCIT) right cover. See “HCIT right cover removal” on page 4-196. 2.Disconnect the five connectors (A) from the HCIT controller board. C D A
Repair information4-207 5026 Go Back Previous Next 3.Release the hooks (B) securing the pass thru sensor from the top plate assembly. 4.Remove the fourteen screws (C) securing the top plate assembly to the frame. 5.Remove the top plate assembly. B CC C
Connector locations5-1 5026 Go Back Previous Next 5. Connector locations Locations
5-2Service Manual 5026 Go Back Previous Next Connectors System board diagram JSB1JBIN1 JFAN1JFUSER1 JBOR1JHVPS1 JMIRR1 JBLW1 JCVR1 JLVPS2 JCARTP1 JCARTS1 JCARTS2 JCARTP2 JDVR1 JTPS 19 JOX1 JFDS1 JINT1 JFDPCK1 JTRAY1JSEC1 JMPFPP1J7J19 JT 9JPH1JFMUSB1J2J2 F5 F7F8 F9 F10 F11 F14
Connector locations5-3 5026 Go Back Previous Next System board listing See “System board diagram” on page 5-2. Connector Description F(#) Fuse J2 Operator panel I/F J5 Ethernet connector JBIN1 Output bin sensor JBLW1 Cartridge blower JBOOT1 Daughter card boot connector JBOR1 Black only retract connector JBUSB1 USB device port JCARTP1 Cartridge 1 BLDC motor (upper) JCARTS1 Fuser and cartridge 1 connector JCARTS2 Cartridge 2 BLDC motor (lower) JCVR1 +25V Cover Open Switch Connector JDVR1 Daughter card motor driver JDX1 Duplex/MFP BDC motor drive JFAN1 System fan JFDPCK1 Feed and pick motor connector JFDS1 Feed thru sensor connector JFMUSB1 USB device port JFUSER1 Fuser motor connector JHVPS1 High voltage power supply JINT1 Interlock switch (5v) JLVPS2 Low voltage power supply JMIRR Mirror motor connector JMPFPP1 MPF sensor JOPT1 Option port connector JPH1 Printhead connector JSB1 Cartridge SB connector JSEC1 Security jumper connector JTOPP1 Speaker connector JTPS1 Toner patch sensor connector JTRAY1 Tray 1 input, NMT sensors JUSB1 USB device port
Preventive maintenance6-1 5026 Go Back Previous Next 6. Preventive maintenance This chapter describes procedures for printer preventive maintenance. Follow these recommendations to help prevent problems and maintain optimum performance. Safety inspection guide The purpose of this inspection guide is to aid you in identifying unsafe conditions. If any unsafe conditions exist, find out how serious the hazard could be and if you can continue before you correct the hazard. Check the following items: •Damaged, missing, or altered parts, especially in the area of the On/Off switch and the power supply •Damaged, missing, or altered covers, especially in the area of the top cover and the power supply cover •Possible safety exposure from any non-Lexmark attachments Lubrication specifications Lubricate only when parts are replaced or as needed, not on a scheduled basis. Use of lubricants other than those specified can cause premature failure. Some unauthorized lubricants may chemically attack polycarbonate parts. Use IBM no. 10 oil, P/N 1280443 (Approved equivalents: Mobil DTE27, Shell Tellus 100, Fuchs Renolin MR30), IBM no. 23 grease (Approved equivalent Shell Darina 1), and grease, P/N 99A0394 to lubricate appropriate areas. Use Nyogel type 774 to lubricate the Fuser Drive Assembly and Nyogel 744 to lubricate the ITU and Cartridge Drive assemblies. Maintaining the printer Periodically, certain tasks are required to maintain optimum print quality. Cleaning the exterior of the printer 1.Make sure that the printer is turned off and unplugged from the outlet. 2.Remove paper from the standard exit bin. 3.Dampen a clean, lint-free cloth with water. Warning: Potential Damage: Do not use household cleaners or detergents, as they may damage the finish of the printer. 4.Wipe only the outside of the printer, making sure to include the standard exit bin. Warning: Potential Damage: Using a damp cloth to clean the interior may cause damage to your printer. 5.Make sure the paper support and standard exit bin are dry before beginning a new print job. CAUTION SHOCK HAZARD: To avoid the risk of electric shock when cleaning the exterior of the printer, unplug the power cord from the outlet, and disconnect all cables to the printer before proceeding.
6-2Service Manual 5026 Go Back Previous Next Cleaning the printhead lenses Clean the printhead lenses when you encounter print quality problems. 1.Open the front access door. Warning: Potential Damage: To avoid overexposing the photoconductor units, do not leave the front door open for more than 10 minutes. 2.Remove all four toner cartridges. Do not remove the photoconductor units for this procedure. 3.Locate the four printhead lenses. 4.Clean the lenses using a can of compressed air. Warning: Potential Damage: Do not touch the printhead lenses. 5.Reinstall the four toner cartridges. 6.Close the front door. Moving the printer Follow these guidelines to avoid personal injury or printer damage: •Always use at least two people to lift the printer. •Always turn off the printer using the power switch before moving it. •Disconnect all cords and cables from the printer before moving it. •Remove the printer from the options before moving it. 1 CAUTION POTENTIAL INJURY: The printer weight is greater than 54 lbs (24.5kg) and requires two or more trained personnel to lift it safely.