Lexmark C 950 Service Manual

							General information 1-7
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Media input type specifications
Printer
The printer supports 60–300-g/m2 (16–80-lb) paper weights. The duplex unit supports 60–169-g/m2 (16–32-lb) 
paper weights.
Note:  Labels, transparencies, envelopes, and card stock always print at reduced speed.
Universal  64-297 mm x 148-432 mm4 8 44 8 444
7¾ Envelope (Monarch)  98 x 191 mm8 84848 8 8
9 Envelope 98 x 226 mm88888888
Com 10 Envelope  105 x 241 mm8 84848 8 8
DL Envelope 110 x 220 mm 8 84848 8 8
C5 Envelope 162 x 229 mm 8 84848 8 8
B5 Envelope 176 x 250 mm88884888
Other envelope 86 x 165 mm 
to 216 x 356 mm8 84848 8 8
Input type
520-sheet tray2,000-sheet DrawerMP feederManual paperManual EnvelopeDuplexADFScanner glass
Paper
• Bond
• Glossy
• Heavy Glossy
• Colored
• Custom Type [x]
• Letterhead
• Light
• Heavy
•Preprinted
• Rough/Cotton
•Recycled
4444 8 444
Input source
520-sheet tray
2,000-sheet Drawer
MP feeder
Manual paper
Manual Envelope
Duplex
ADF
Scanner glass
4—Supported 
8—Not supported
4—Supported 
8—Not supported 
						

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Finisher
Use this table to determine the possible exit destinations of print jobs which use supported paper types and 
weights. The paper capacity of each exit bin is listed in parentheses. Paper capacity estimations are calculated 
based on 75-g/m
2 (20-lb) paper.
The finisher standard bin supports 60–300-g/m
2 (16–80-lb) paper weights, bin 1 supports 60–220-g/m2 (16–60-
lb) paper weights, and bin 2 (booklet-maker) supports 60–90-g/m2 (16–24-lb) paper weights plus one additional 
cover weighted up to 220 g/m2 (60 lb).
Card stock4444 8 8 8 4
Transparencies4444 8 8 8 4
Labels
• Paper
•Vinyl
4444 8 8 8 4
Envelopes8 84848 84
Input type
Standard 500-sheet bin
Second exit bin
Bin 1
Bin 2
Bin 3
Plain paper44444
Card stock4444 8
Transparencies44888
Recycled44888
Input type
520-sheet tray
2,000-sheet Drawer
MP feeder
Manual paper
Manual Envelope
Duplex
ADF
Scanner glass
4—Supported 
8—Not supported
4—Supported 
8—Not supported 
						

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Supported finishing features
Notes:  
•The finisher shown is the booklet finisher. Bin 2 is available only when the booklet finisher is installed.
•All paper tray capacities are based on 75-g/m2 (20-lb) paper.
Paper transport
•The paper capacity is 50 sheets.
•Finishing options are not supported in this bin.
•Envelopes are routed here.
•Universal paper is routed here when it is longer than 483 mm (19 in.) or shorter than 148 mm (6 in.).
Finisher standard bin
•The paper capacity is 500 sheets.
•Envelopes and executive-size paper are not supported in this bin.
•Finishing options are not supported in this bin.
CalloutPart name
1Finisher standard bin
2Finisher Bin 1 
3Finisher Bin 2 (booklet-maker)
4Bridge unit
4
1
2
3 
						

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Bin 1
•The paper capacity is 3,000 sheets when the standard finisher is installed.
•The paper capacity is 1,500 sheets when the booklet finisher is installed.
Bin 2 (booklet-maker)
Bin 2 is available only when the booklet finisher is installed. The paper capacity of Bin 2 (booklet-maker) is 300 
sheets or 20 sets of 15-sheet booklets.
Bin 1 finishing features
Size
Punch*
Offset
Single/Double staple
Double dual staple
A3 4444
A4 4444
A5 8888
Executive 444 8
Folio 8448
JIS B4 444 8
JIS B5 444 8
Legal 8448
Letter 4444
Statement 8884
Tabloid 444 8
Universal 4444
Envelopes (any size) 8888
*For the Universal paper size, the finishing edge must be at least 9 in. (229 
mm) for a 3-hole punch and 10 in. (254 mm) for a 4-hole punch.
Punch—Selects from two-, three-, or four-hole punch
Single staple—Uses only one staple
Double staple—Uses two staples
Double dual staple—Uses two sets of two staples. This setting is supported 
only for widths between 8 in. (203 mm) and 12 in. (297 mm) with lengths 
between 7 in. (182 mm) and 17 in. (432 mm).
Bin 2 finishing features
SizeBi fold
Booklet fold
Saddle staple
A3 ???
4—Supported 
8—Not supported
4—Supported 
8—Not supported 
						

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Media guidelines
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 300 g/m2 (16 to 80 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.
Notes:
–The duplex unit supports only 60–169 g/m2 (16–32 lb bond) paper weights.
–The multipurpose feeder supports 60–300 g/m2 (16–80 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. A4 (only SEF) 
444
A5 888
Executive 888
Folio 444
JIS B4 444
JIS B5 888
Legal 444
Letter (only SEF) 444
Statement 888
Tabloid 444
Universal 888
Envelopes (any size) 888
SEF—The paper is loaded in the short edge orientation. The short 
edge of the paper enters the printer first.
Bi fold—Each page is individually folded and stacked separately.
Booklet fold—A multiple-page job is folded along the center into a 
single booklet.
Saddle staple—A booklet-fold print job is stapled along the center 
fold.
Bin 2 finishing features
SizeBi fold
Booklet fold
Saddle staple
4—Supported 
8—Not supported 
						

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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
•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.
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 paper 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 24 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. 
						

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Using recycled paper and other office papers
As an environmentally conscientious company, Lexmark supports the use of recycled paper produced 
specifically for use in printhead LED (electrophotographic) printers.
While no blanket statement can be made that all recycled paper will feed well, Lexmark consistently tests papers 
that represent recycled cut size copier papers available on the global market. This scientific testing is conducted 
with rigor and discipline. Many factors are taken into consideration both separately and as a whole, including the 
following:
•Amount of post-consumer waste (Lexmark tests up to 100% post-consumer waste content.)
•Temperature and humidity conditions (Testing chambers simulate climates from all over the world.)
•Moisture content (Business papers should have low moisture: 4–5%.)
•Bending resistance and proper stiffness means optimum feeding through the printer.
•Thickness (impacts how much can be loaded into a tray)
•Surface roughness (measured in Sheffield units, impacts print clarity and how well toner fuses to the 
paper)
•Surface friction (determines how easily sheets can be separated)
•Grain and formation (impacts curling, which also influences the mechanics of how the paper behaves as it 
moves through the printer)
•Brightness and texture (look and feel)
Recycled papers are better than ever; however, the amount of recycled content in a paper affects the degree of 
control over foreign matter. And while recycled papers are one good path to printing in an environmentally 
responsible manner, they are not perfect. The energy required to de-ink and deal with additives such as 
colorants and “glue” often generates more carbon emissions than does normal paper production. However, 
using recycled papers enables better resource management overall.
Lexmark concerns itself with the responsible use of paper in general based on life cycle assessments of its 
products. To gain a better understanding of the impact of printers on the environment, the company 
commissioned a number of life cycle assessments and found that paper was identified as the primary contributor 
(up to 80%) of carbon emissions caused throughout the entire life of a device (from design to end-of-life). This is 
due to the energy-intensive manufacturing processes required to make paper.
Thus, Lexmark seeks to educate customers and partners on minimizing the impact of paper. Using recycled 
paper is one way. Eliminating excessive and unnecessary paper consumption is another. Lexmark is well-
equipped to help customers minimize printing and copying waste. In addition, the company encourages 
purchasing paper from suppliers who demonstrate their commitment to sustainable forestry practices.
Lexmark does not endorse specific suppliers, although a converter’s product list for special applications is 
maintained. However, the following paper choice guidelines will help alleviate the environmental impact of 
printing:
1.Minimize paper consumption.
2.Be selective about the origin of wood fiber. Buy from suppliers who carry certifications such as the Forestry 
Stewardship Council (FSC) or The Program for the Endorsement of Forest Certification (PEFC). These 
certifications guarantee that the paper manufacturer uses wood pulp from forestry operators that employ 
environmentally and socially responsible forest management and restoration practices.
3.Choose the most appropriate paper for printing needs: normal 75 or 80 g/m2 certified paper, lower weight 
paper, or recycled paper.
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. 
						

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•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
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)
0.3μm toner vacuum 
						

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Acronyms
3TM3-Tray Module
ACAlternating Current
ADFAutomatic Document Feeder
ASICApplication-specific Integrated Circuit
CCyan
CCDCharge Coupled Device
CCPCarbonless Copy Paper
CCWCounter-clockwise
DCDirect Current
DRAM Dynamic Random Access Memory
EEPROMElectrically Erasable Programmable Read-Only Memory
EP    ElectroPhotographic
EPROMErasable Programmable Read-Only Memory
ESD   Electrostatic Discharge
FBFlatbed
FPGAField-programmable Gate Array
FRU   Field Replaceable Unit
FSCForestry Stewardship Council
GBGigabyte
HCFHigh Capacity Feeder
HDDHard Disk Drive
HIDHuman Interface Device
HPHome Position
HVPS High Voltage Power Supply
IGBTInsulated-gate Bipolar Transistor
INAInternal Network Adapter
ISPInternal Solutions Port
ITUImage Transfer Unit
KBlack
LCD   Liquid Crystal Display
LDAPLightweight Directory Access Protocol
LED   Light-Emitting Diode
LEFLong-edge Fed
LESLexmark Embedded Solution
LVPSLow Voltage Power Supply
MMagenta
MBMegabyte
MFPMulti-function Printer
MPFMultipurpose Feeder
MTUMaximum Transmission Unit
NCRNo Carbon Required Paper
NSNot Shown
NVMNonvolatile Memory
NVRAM Nonvolatile Random Access Memory
OCROptical Character Recognition
PC    Photoconductor
PCBAPrinted Circuit Board Assembly
PEFCProgram for the Endorsement of Forest Certification
pelPicture element
PINPersonal Identification Number
PORPower-On Reset 
						

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PPParts Packet
PPDSPersonal Printer Data Stream
RAMRandom Access Memory
RFIDRadio-frequency Identification
RIPRaster Imaging Processor
ROMRead Only Memory
SEService Engineer
SEFShort-edge Fed
SMTPSimple Mail Transfer Protocol
SNMPSimple Network Management Protocol
TPSToner Patch Sensing
TTMTandem Tray Module
URLUniform Resource Locator
USBUniversal Serial Bus
V acVolts alternating current
V dcVolts direct current
YYellow