Lexmark C 746 Service Manual

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1.  General information
The Lexmark™ C746x and C748x family of color laser printers. 
Models
Options
Printer nameMachine type 
and modelDescription
Lexmark C746n 5026-310 Network-ready 
Lexmark C746dn 5026-330 Network-ready with duplex 
Lexmark C746dtn 5026-330 Network-ready with duplex and 550 sheet tray
Lexmark C748e 5026-510 Network-ready with etask touch screen
Lexmark C748de 5026-530 Network-ready with etask touch screen and duplex
Lexmark C748dte 5026-530 Network-ready with etask touch screen, duplex, and 
550 sheet tray
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Note:  Some configurations may require a caster base for stability.
Media options
The C746x and C748x printers support the 550-sheet drawer, special media drawers, and 2000-sheet high-
capacity input tray. The C746x and C748x printers support up to four input options. The options can include any 
combination of 550 sheet drawers and 550 sheet Specialty Media Drawers, with a maximum of one 2000 sheet 
drawer (always at the lowest position.) A caster base is required with some configurations. Including the base 
machine capacity of 650 sheets, the C746x and C748x supports up to 4300 sheets. 
The Lexmark C74x options are compatible with the Lexmark C73x SFP, X73x MFP, and X74x MFP, but not with 
any other Lexmark printers. No other options are supported by the C74x.
The media options include: 
•550-Sheet Drawer—This optional input source installs beneath the printer, and it holds approximately 550 
sheets of (20 lb.) paper. 
•High Capacity Input Tray—This optional input source installs beneath the printer, and it holds 
approximately 2000 sheets of (20 lb.) paper. 
•Specialty Media Drawer—This optional input source installs beneath the printer, and it holds 
approximately 550 sheets of (20 lb.) paper, or 85 standard envelopes. 
Memory options
•Additional memory card—The memory options for the C746x and C748x printers are 200 pin DDR2, 
SODIMM, and they are available at 256MB, 512MB, and 1GB sizes. 
•Flash memory card—Flash Memory cards are available in 256MB. 
•Hard disk—If larger storage is required, an optional hard disk is available. Number Description
1 Standard output bin
2 Paper support
3 Printer operator panel
4 Standard 550-sheet stray (Tray 1)
5 Multipurpose feeder
6 Optional 550-sheet specialty media drawer
7 Optional 550-sheet tray
8 Optional 2,000-sheet high.capacity feeder 
						

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Printer specifications
Dimensions
The following table contains the dimensions and weight for each of the respective printer models. This does not 
include packaging.
Height Width Depth Weight
Basic printer (C746n/dn) 454.7 mm
(17.9 in)435.0 mm
(17.1 in)400.0 mm
(15.7 in)25.2 kg
(55.6 lbs)
Basic printer (C748e/de) 454.7 mm
(17.9 in)435.0 mm
(17.1 in)400.0 mm
(15.7 in)25.6 kg
(56.4 lbs)
C746dtn printer, with 550-sheet 
optional drawer581.7 mm
(22.9 in)435.0 mm
(17.1 in)545.0 mm
(21.5 in)29.7 kg
(65.5 lbs)
C748dte printer, with 550-sheet 
optional drawer581.7mm
(22.9 in)435.0 mm
(17.1 in)545.0 mm
(21.5 in)30.1kg
(66.4 lbs)
550-sheet drawer 169.0 mm
(6.6 in)435.0 mm
(17.1 in)545.0 mm
(21.5 in)4.5 kg
(10.0 lbs)
550-sheet special media drawer 169.0 mm
(6.6 in)435.0 mm
(17.1 in)545.0 mm
(21.5 in)4.5 kg
(10.0 lbs)
2000-sheet high capacity feeder 387.0 mm
(15.2 in)435.0 mm
(17.1 in)545.0 mm
(21.5 in)26.1 kg
(57.5 lbs)
Spacer 169.0 mm
(6.6 in)435 mm
(17.1 in)545 mm
(21.5 in)3.2 kg
(7.0 lbs)
Caster Base 127.0 mm
(5.0 in)778 mm
(30.6 in)812.0 mm
(32.0 in)43.1 kg
(95.0 lbs) 
						

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Clearances
Memory
Number Description Clearance
1 Right side 101.6 mm (4 in.)
2 Front 609.6 mm (24 in.)
3 Left side 152.4 mm (6 in.)
4 Rear 152.4 mm (6 in.)
5 Top 304.8 mm (12 in.)
C746 C748
Standard memory—The standard RAM is soldered onto the system board.
Memory size
512MB 512MB
Optional memory—Optional DIMM (Dual Inline Memory Module) is a card that can be plugged into an 
available memory slot on the system board. Flash memory is a card that can also be plugged into an 
available slot.
Maximum number of memory (DIMM) slots
11
Maximum number of flash memory slots
11
DIMM memory sizes available
256MB, 512MB, 1024MB 256MB, 512MB, 1024MB
Flash (Nand Flash)
256 256
Maximum possible memory
1536MB 1536MB
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Expansion opportunities
Resolution
The following resolutions are available:
•4800CQ (default resolution) 
•1200 x 1200 dpi (at reduced printer speed)
Data streams
•XPS
•PCL 6 emulation (includes PCL 5e and PCL XL interpreters)
•PostScript 3 emulation
•PDF 1.6 
•PPDS 
•PictBridge
•HTML (including DBCS)
•Direct Image (TIFF, TIF, JPEG, JPG, GIF, PNG, BMP, PCX, and DCX)
Environment specifications
Interface card expansion slots 1
Code Enhancement Socket 
(application solution firmware)2
Hard disk Interface 
(for optional hard disk)1
Environment Specifications
Operating
Air temperature—Operating 15.6° to 32.2° C (60° to 90° F)
Air temperature—Power off 10° to 40° C (50° to 104° F)
Air Relative Humidity Relative humidity 8% to 80%
Wet Bulb Temperature—Operating 22.8° C (73.0° F) Maximum
Web Bulb Temperature—Power off 26.7° C (80.1° F) Maximum
Altitude 0–3,048 meters (10,000 ft.)
Ambient Operating Environment*  15.6° to 32.2° C (60° to 90° F) and 8% to 80% RH
Shipping and storage
Cartridges (packaged) -40° C to 40° C (104° Fahrenheit)
Printer with Cartridges (packaged) -40° C to 40° C   (104° Fahrenheit)
Printer without Cartridges -40° C to 40° C   (104° Fahrenheit)
Air Relative Humidity Relative humidity 8% to 80%
Altitude 0–10,300 meters (34,000 feet) 
						

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Electrical and power specifications
The following table specifies nominal average power requirements for the basic printer configurations. All power 
levels are shown in Watts (W). Maximum current is given in Amperes (A).
Low-voltage models
•110 to 127 V at 50 to 60 Hertz (Hz) nominal
•99 to 139.7 V, extreme
•100 V at 50 to 60 Hertz (Hz) nominal
•90 to 121 V, extreme
High-voltage models
•220 to 240 V at 50 to 60 Hz (not available in all countries)
•198 to 259 V, extreme
Notes:
•Using a power converter or inverter with the Lexmark C740 Series printers is not recommended.
•The C740 series duplex models (C746dn, C746dtn, C748de, C748dte) are Energy Star Qualified.
•All models ship with Sleep Mode = On.
•The default time out to Sleep mode is 30 minutes. Web Bulb Temperature—Power Off 26.7° C (80.1° F) Maximum
* In some cases performance specifications, such as paper OCF and EP cartridge usage, are specified to 
be measured at an ambient condition.
Printing states C746n/dn/dtn Lexmark C748e/de/dte
Off  0W  0W
Sleep mode  6.8W  7.3W
Hibernate mode 0.55W 0.55W
Ready Mode 48W  48W
Simplex Printing 535W 535W
Duplex Printing 420W 420W
Typical Electricity Consumption 
Test 3.561 kwh / wk 3.687 kwh / wk
Typical Electricity Consumption 
Test (Eco-Mode) 2.375 kwh / wk 2.491 kwh / wk
Average current while printing
(110 Volts)8.3 A 8.3 A
Average current while printing
(120 Volts)7.5 A 7.5 A
Average current while printing
(230 Volts)3.8 A 3.8 A
Environment Specifications 
						

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Acoustic specifications
All acoustic measurements are made in accordance with ISO 7779:1999—Accoustics: Measurement of airborne 
noise emitted by information technology and telecommunications and reported in conformance with ISO 9296: 
1988-04-15—Accoustics Declared noise emission values of computer and business equipment.
Operating mode1 meter average sound pressure 
(dBA)Declared sound power level 
(Bels)
C746
Idle 32 dB 4.8 Bels
Simplex printing (mono) 53 dB 6.8 Bels
Simplex printing (color) 54 dB 6.8 Bels
Duplex printing (mono) 54 dB 6.9 Bels
Duplex printing (color) 55 dB 6.9 Bels
Quiet mode printing (mono) 48 dB 6.3 Bels
Quiet mode printing (color) 48 dB 6.3 Bels
C748
Idle 32 dB 4.8 Bels
Simplex printing (mono) 54 dB 6.8 Bels
Simplex printing (color) 55 dB 6.9 Bels
Duplex printing (mono) 53 dB 6.9 Bels
Duplex printing (color) 55 dB 6.9 Bels
Quiet mode printing (mono) 47 dB 6.3 Bels
Quiet mode printing (color) 48 dB 6.3 Bels 
						

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Media specifications
Paper designed for use with xerographic copiers should provide satisfactory print quality and feed reliability. 
Other types of media may be suitable. It is recommended that users test any particular brand for suitability to 
their applications. Refer to the printer Users Guide for additional media specifications.
Paper
Follow the media guidelines below for successful printing:
•Rough, highly textured, limp, or pre-curled papers will result in lower print quality and more frequent paper 
feed failures.
•Colored papers must be able to withstand 190° C (374° F) fusing temperature.
•Preprinted forms and letterheads must be able to withstand 190° C (374° F) fusing temperature and should 
be selected using guidelines found in the printer User’s Guide. The chemical process used in preprinting 
may render some papers unsuitable for use.
•Unsuitable papers include:
–Multi-part forms and documents
–Chemically treated papers; coated
–Synthetic and thermal papers
–A5 paper less than 80 g/m2 (21 lb)
–Recycled paper less than 75 g/m2 (20 lb)
–Preprinted papers requiring a high degree of registration.
–Recycled paper less than 80 g/m2 (21 lb) may cause unacceptable results.
Envelopes
•
All envelopes should be new, unused, and without package damage. 
•Envelopes with excessive curl or twist exceeding 6 mm, those stuck together, those with bent corners or 
nicked edges, or those that interlock should not be used.
•Minimum weight: 60 g/m2 (16 lb.)
•The following envelopes should not be used:
•Envelopes with windows, holes, perforations, cutouts, or deep embossing
•Envelopes with metal clasps, string ties, or metal folding bars
•Envelopes with exposed flap adhesive when the flap is in the closed position.
•For best results, printing on new 90 g/m2 (24 lb.) sulfite or 25% cotton bond envelopes is recommended. 
•Under high humidity conditions (over 60%), envelopes may seal during printing.
Transparencies
•
Use letter or A4-size transparencies for color laser printers only.
•See Ordering Information for the recommended transparencies for the Lexmark C746x/C748x laser 
printers.
•Do not use inkjet transparencies.
Labels
Labels should be selected using guidelines found in the Users Guide or the Card Stock and Label Guide, and 
tested for acceptability. 
						

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Using recycled paper and other office papers
Recycled office paper produced specifically for use in laser (electrophotographic) printers may be used in your 
printer. However, no blanket statement can be made that all recycled paper will feed well.
Generally, the following property guidelines apply to recycled paper.
•Low moisture content (4–5%)
•Suitable smoothness (100–200 Sheffield units, or 140–350 Bendtsen units, European)
Note:  Some much smoother papers (such as premium 24 lb laser papers, 50–90 Sheffield units) and 
much rougher papers (such as premium cotton papers, 200–300 Sheffield units) have been engineered to 
work very well in laser printers, despite surface texture. Before using these types of paper, consult your 
paper supplier.
•Suitable sheet-to-sheet coefficient of friction (0.4–0.6)
•Sufficient bending resistance in the direction of feed
Recycled paper, paper of lower weight (
						

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Input and output capacities
The following table describes the media options that each model supports, and the estimated capacities in stand 
and maximum configurations. Capacity may vary and is subject to media specifications and printer operating 
environment. The capacities are based on plain paper at 75g/m
2. 
Standard input sources
Primary tray capacity (sheets) 550
Multipurpose feeder capacity (sheets) 100
Number of standard sources (primary tray 
and multipurpose feeder)2
Total standard capacity (sheets) 650
Optional input sources
550-Sheet Drawer (sheets) 550
High-capacity input tray (HCIT) (sheets) 2,000
Specialty Media Drawer
a (sheets) 550 (or 85 envelopes)
Maximum number of 550-sheet drawers 
(including Speciality Media Drawer)4
Maximum number of high-capacity input 
tray (must be installed on the bottom)1
Maximum number of standard and 
optional input sources6
Maximum capacity for standard and 
options input sources (sheets)4,300
Standard output bin capacity (sheets)
b 300
Maximum output bin capacity (sheets) 300
Duplex capability Standard for 
C746dn,C746dtn,C748de,and 
C748dte models
aEach 550-sheet Specialty Media Drawer replaces one 550-sheet option.
bThe output bin capacity may be reduced by 50 sheets when the duplex feature is in 
use.