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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...

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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...