Lexmark C 746 Service Manual
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General information1-11 5026 Go Back Previous Next Input and output sizes and types Media Sizes Primary 550-sheet tray Multipurpose feeder Optional 550-sheet tray Optional Speciality Media Optional 2000-sheet feeder (HCIT) Duplex Paper sizes A4 210 x 297 mm✓✓✓✓✓✓ A5 148 x 210 mm✓✓✓✓ ✓ A6 105 x 148 mm✓✓ JIS B5 182 x 257 mm✓✓✓✓ ✓ Officio (Mexico) 216 x 340 mm✓✓✓✓ ✓ Letter 8.5 x 11 in.✓✓✓✓✓✓ Legal 8.5 x 14 in.✓✓✓✓✓✓ Statement 5.5 x 8.5 in.✓✓✓ Executive 7.25 x 10.5 in.✓✓✓✓ ✓ Folio 8.5 x 13 in.✓✓✓✓ ✓ Universal✓✓✓✓ ✓
1-12Service Manual 5026 Go Back Previous Next Envelopes C6 Envelope 114 x 162 mm a✓✓ B6 Envelope 125 x 176 mm a✓✓ C65 Envelope 114 x 229 mm a✓✓ C5 Envelope 162 x 229 mm✓✓ B5 Envelope 176 x 250 mm✓✓ DL Envelope 110 x 220 mm✓✓ 6 3/4 Envelope 3.4 x 6.5 in a ✓✓ 7 3/4 Envelope 3.4 x 7.5 in ✓✓ 9 Envelope 3.9 x 8.9 in✓✓ 10 Envelope 4.13 x 9.5 in✓✓ 11 Envelope 4.5 x 10.4 in a ✓✓ 12 Envelope 4.8 x 11 in a ✓✓ aThese sizes are accessible using Other Envelope setting. Media weight, primary tray and option tray Size Type Weight Letter, Legal, A4 Xerographic and bond Long grain 60 g/m 2–162.7 g/m2 (16 lb–43 lb) Short grain 162.7 g/m 2–198.9 g/m2 (43 lb–53.2 lb) Recycled Long grain 75 g/m 2–177 g/m2 (20 lb–47 lb) Short grain 105 g/m 2–218 g/m2 (28 lb–58 lb) Cardstock (maximum) Index long/short 162.7 g/m 2–198.9 g/m2 (90 lb–110 lb) Cover long/short 162.7g/m 2–198.9 g/m2 (60.1 lb–73.6 lb) Tag long/short 162.7g/m 2–198.9 g/m2 (100 lb–122.2 lb) Transparencies 161 g/m 2– 179 g/m2 Thickness: 0.12–0.14mm (4.8–5.4 mil) Labels Paper 180 g/m 2–300 g/m2 (48 lb–80 lb) Vinyl 180 g/m 2–300 g/m2 (48 lb–80 lb) Media Sizes (continued) Primary 550-sheet tray Multipurpose feeder Optional 550-sheet tray Optional Speciality Media Optional 2000-sheet feeder (HCIT) Duplex
General information1-13 5026 Go Back Previous Next Paper guidelines Paper characteristics The following paper characteristics affect print quality and reliability. Consider these characteristics when evaluating new paper stock. Weight—The printer can automatically feed paper weights from 60 to 162l7 g/m 2 (16 to 43 lb bond) grain long. Paper lighter than 60 g/m2 (16 lb) might not be stiff enough to feed properly, causing jams. For best performance, use 75 g/m2 (20 lb bond) grain long paper. For paper smaller than 182 x 257 mm (7.2 x 10.1 in.), we recommend 90 g/m2 (24 lb) or heavier paper. Note: Duplex is supported only for 63 g/m 2–170 g/m2 (17 lb–45 lb bond) paper. Curl—Curl is the tendency for paper to curl at its edges. Excessive curl can cause paper feeding problems. Curl can occur after the paper passes through the printer, where it is exposed to high temperatures. Storing paper unwrapped in hot, humid, cold, or dry conditions, even in the trays, can contribute to paper curling prior to printing and can cause feeding problems. Smoothness—Paper smoothness directly affects print quality. If paper is too rough, toner cannot fuse to it properly. If paper is too smooth, it can cause paper feeding or print quality issues. Always use paper between 100 and 300 Sheffield points; however, smoothness between 150 and 200 Sheffield points produces the best print quality. Moisture content—The amount of moisture in paper affects both print quality and the ability of the printer to feed the paper correctly. Leave paper in its original wrapper until it is time to use it. This limits the exposure of paper to moisture changes that can degrade its performance. Condition paper before printing by storing it in its original wrapper in the same environment as the printer for 24 to 48 hours before printing. Extend the time several days if the storage or transportation environment is very different from the printer environment. Thick paper may also require a longer conditioning period. Grain direction—Grain refers to the alignment of the paper fibers in a sheet of paper. Grain is either grain long, running the length of the paper, or grain short, running the width of the paper. For 60 to 135 g/m 2 (16 to 36 lb bond) paper, grain long paper is recommended. For papers heavier than 135 g/m2, grain short is recommended. Fiber content—Most high-quality xerographic paper is made from 100% chemically treated pulped wood. This content provides the paper with a high degree of stability resulting in fewer paper feeding problems and better print quality. Paper containing fibers such as cotton can negatively affect paper handling. Unacceptable paper The following paper types are not recommended for use with the printer: •Chemically treated papers used to make copies without carbon paper, also known as carbonless papers, carbonless copy paper (CCP), or no carbon required (NCR) paper •Preprinted papers with chemicals that may contaminate the printer •Preprinted papers that can be affected by the temperature in the printer fuser A5, JIS B5, Executive Xerographic and bond Long grain 75 g/m 2–177 g/m2 (20 lb to 47 lb) Short grain 90 g/m 2–218 g/m2 (24 lb–58 lb) Universal Xerographic and bond Long grain 75 g/m 2–177 g/m2 (20 lb–47 lb) Short grain 90 g/m 2–218 g/m2 (24 lb–58 lb) Media weight, primary tray and option tray Size Type Weight
1-14Service Manual 5026 Go Back Previous Next •Preprinted papers that require a registration (the precise print location on the page) greater than ±2.3 mm (±0.9 in.), such as optical character recognition (OCR) forms Note: In some cases, registration can be adjusted with a software application to successfully print on these forms. •Coated papers (erasable bond), synthetic papers, thermal papers •Rough-edged, rough or heavily textured surface papers, or curled papers •Recycled papers that fail EN12281:2002 (European) •Paper weighing less than 60 g/m2 (16 lb) •Multiple-part forms or documents Selecting paper Using appropriate paper prevents jams and helps ensure trouble-free printing. To help avoid jams and poor print quality: •Always use new, undamaged paper. •Before loading paper, know the recommended print side of the paper. This information is usually indicated on the paper package. •Do not use paper that has been cut or trimmed by hand. •Do not mix paper sizes, types, or weights in the same source; mixing results in jams. •Do not use coated papers unless they are specifically designed for electrophotographic printing. Selecting preprinted forms and letterhead Use these guidelines when selecting preprinted forms and letterhead: •Use grain long for 60 to 90 g/m2 (16 to 20 lb) weight paper. •Use only forms and letterhead printed using an offset lithographic or engraved printing process. •Avoid papers with rough or heavily textured surfaces. Use papers printed with heat-resistant inks designed for use in xerographic copiers. The ink must be able to withstand temperatures up to 190°C (374°F) without melting or releasing hazardous emissions. Use inks that are not affected by the resin in toner. Inks that are oxidation-set or oil-based generally meet these requirements; latex inks might not. When in doubt, contact the paper supplier. Preprinted papers such as letterhead must be able to withstand temperatures up to 190°C (374°F) without melting or releasing hazardous emissions.
General information1-15 5026 Go Back Previous Next Storing paper Use these paper storage guidelines to help avoid jams and uneven print quality: •For best results, store paper where the temperature is 21°C (70°F) and the relative humidity is 40%. Most label manufacturers recommend printing in a temperature range of 18 to 24°C (65 to 75°F) with relative humidity between 40 and 60%. •Store paper in cartons when possible, on a pallet or shelf, rather than on the floor. •Store individual packages on a flat surface. •Do not store anything on top of individual paper packages. Tools required for service Flat-blade screwdrivers, various sizes #1 Phillips screwdriver, magnetic #2 Phillips screwdriver, magnetic #2 Phillips screwdriver, magnetic short-blade 7/32 inch (5.5 mm) open-end wrench 4.0 mm Allen wrench (HCIT removal) 7.0 mm nut driver Needlenose pliers Diagonal side cutters Spring hook Feeler gauges Analog or digital multimeter Parallel wrap plug 1319128 Twinax/serial debug cable 1381963 Coax/serial debug cable 1381964 Flash light (optional)
1-16Service Manual 5026 Go Back Previous Next Acronyms BLDC Brushless DC Motor BUR Back Up Roll CCyan COD Color On Demand DIMM Dual Inline Memory Module DRAM Dynamic Random Access Memory EP Electrophotographic Process ESD Electrostatic Discharge FRU Field Replaceable Unit GB Gigabyte HCIT High-Capacity Input Tray HVPS High Voltage Power Supply KBlack LASER Light Amplification by Stimulated Emission of Radiation LCD Liquid Crystal Display LED Light-Emitting Diode LVPS Low-Voltage Power Supply M Magenta MPF Multipurpose Feeder NVRAM Nonvolatile Random Access Memory PC Photoconductor pel Picture element (pixel) POR Power-On Reset POST Power-On Self Test RIP Raster Imaging Processor SDRAM Synchronous Dual Random Access Memory V ac Volts alternating current V dc Volts direct current YYellow
Diagnostic information2-1 5026 Go Back Previous Next 2. Diagnostic information Start Use the service error code, user status message, user error message, symptom table, service checks, and diagnostic aids in this chapter to determine the corrective action necessary to repair a malfunctioning printer. They will lead you to solutions or service checks, including the use of various tests. Symptom tables If your printer completes the “Power-on self test (POST) sequence” on page 2-9 without an error, and you have a symptom, go to “Symptom tables” on page 2-9. Locate your symptom, and take the appropriate action. Service errors (1xx.xx/9xx.xx) If a service error code appears while you are working on the printer, go to “1xx service error codes” on page 2-21 or “9xx service error messages” on page 2-38, and take the indicated action for that error. Service error codes are indicated by a three-digit error code followed by a period and additional numbers in the format XXX.YY. In most cases, five digits are shown. Paper jam messages (2xx.xx) User attendance messages that indicate a paper jam have been included with the service error codes since repeated instances may indicate an underlying service issue. Go to “2xx paper jam messages” on page 2-23. User status and attendance messages • User status messages provide the user with information on the current status of the printer. •User attendance messages are indicated by a two-digit code that provides the user with information that explains a problem with a print cartridge, option, port, and so on. If a user error message displays, see “3x through 8x attendance messages” on page 2-13 or “2xx paper jam messages” on page 2-23. Additional information • “Operator panel and menus” on page 2-2 •“Power-on self test (POST) sequence” on page 2-9 CAUTION Remove the power cord from the electrical outlet before you connect or disconnect any cable or electronic card or assembly for personal safety and to prevent damage to the printer. CAUTION—POTENTIAL INJURY: The printer weight is greater than 54 lbs (24.5kg), and requires two or more trained personnel to lift safety.
2-2Service Manual 5026 Go Back Previous Next Operator panel and menus C746x operator panel C746x buttons and light descriptions Use the To 1 Display • View printer status. • Allow printer setup and operation. 2 Select button Submit changes made in the printer settings. 3 Navigation buttons Scroll up and down or left and right. 4 Keypad Enter numbers and letters. 5 Sleep button Enable Sleep mode. The following are the statuses based on the indicator light and the Sleep button:. • Entering or waking from Sleep mode - The indicator light is illuminated solid green. - The Sleep button is un-illuminated. • Operating in Sleep mode - The indicator light is illuminated solid green. - The Sleep button is illuminated solid amber. • Entering or waking from Hibernate mode - The indicator light is illuminated solid green. - The Sleep button is illuminated blinking amber. • Operating in Hibernate mode. - The indicator light is un-illuminated. - The Sleep button is blinking amber for 0.1 second, and then goes completely un-illuminated for 1.9 seconds in pulsing pattern. The following actions wake the printer from Sleep mode: • Pressing any button • Opening Tray 1 or loading paper in the multipurpose feeder • Opening a door or cover • Sending a print job from the computer • Performing a power.on reset with the 6 Stop/Cancel button Stops all printer activities. Note: A list of options are displayed once Stopped appears on the display. 7 Back Return to the previous screen. 8 Home button Go to the home screen. 1345 6879 10 12ABC3DEF4GHI5JKL6MNO7PQR8STU9WXYZ0 2
Diagnostic information2-3 5026 Go Back Previous Next C748x operator panel C748x buttons and light descriptions 9 Indicator light Check the status of the printer. 10 USB port Connect a USB Bluetooth adapter or a flash drive to the printer. Note: Only the front USB port supports flash drives. Use the To 1 Display • View printer status. • Allow printer setup and operation. 2 Home button Go to the home screen. 3 Keypad Enter numbers and letters. Use the To Indicator light statusIndicates Off Printer power is off. Blinking green Printer is warming up, processing data, or printing a job. Solid green Printer is on, but idle. Blinking red Operator intervention is required. 1234 6 75 12ABC3DEF4GHI5JKL6MNO7PQR8STU9WXYZ0
2-4Service Manual 5026 Go Back Previous Next 4 Sleep button Enable Sleep mode. The following are the statuses based on the indicator light and the Sleep button:. • Entering or waking from Sleep mode - The indicator light is illuminated solid green. - The Sleep button is un-illuminated. • Operating in Sleep mode - The indicator light is illuminated solid green. - The Sleep button is illuminated solid amber. • Entering or waking from Hibernate mode - The indicator light is illuminated solid green. - The Sleep button is illuminated blinking amber. • Operating in Hibernate mode. - The indicator light is un-illuminated. - The Sleep button is blinking amber for 0.1 second, and then goes completely un-illuminated for 1.9 seconds in pulsing pattern. The following actions wake the printer from Sleep mode: • Pressing any button • Touching the screen • Opening Tray 1 or loading paper in the multipurpose feeder • Opening a door or cover • Sending a print job from the computer • Performing a Power On Reset (POR) with the main power switch. • Loading paper into the scanner ADF. • Raising the scanner flatbed cover. 5 Stop/Cancel button Stops all printer activities. Note: A list of options are displayed once Stopped appears on the display. 6 Indicator light Check the status of the printer. 7 USB port Connect a USB Bluetooth adapter or a flash drive to the printer. Note: Only the front USB port supports flash drives. Use the To Indicator light statusIndicates Off Printer power is off. Blinking green Printer is warming up, processing data, or printing a job. Solid green Printer is on, but idle. Blinking red Operator intervention is required.