Lexmark C760 Service Manual

							
General information1-13
  5060-4xx
Envelope
7 ¾ Envelope 3.875 in. x 7.5 in. (98 mm 
x 191 mm)  xx    x  x  
9 Envelope 3.875 in. x 8.9 in. (98 mm x 
225.4 mm)  xx    x  x  
10 Envelope 4.125 in. x 9.5 in. (105 mm 
x 241 mm)  xx    x  x  
DL Envelope 4.33 in. x 8.66 in. (110 mm 
x 220 mm)  xx    x  x  
C5 Envelope 6.38 in. x 9.01 in. (162 mm 
x 229 mm)  xx    x  x  
B5 Envelope 6.93 in. x 9.84 in. (176 mm 
x 250 mm)  xx    x  x  
Other envelope
33.87 x 6.38 in. to 6.93 
x 9.84 in. (98.4 x 162 mm to 176 x 250 
mm)  xx    x  x
1 When Universal is selected, the page is formatted for 8.5 x 14 in. (215.9 x 355.6 mm), unless the size is specified in 
the software application.
2 Narrow media should be loaded with the length in the feed direction (portrait).
3 When Other Envelope is selected, the page is formatted for 8.5 x 14 in. (215.9 x 355.6 mm) unless the size is 
specified in the software application.
4 Statement and Folio are supported as standard size through software only. Tray size sensing must be turned off 
before this standard size is visible in the paper-size menu on the operator panel.
5 2-hole punch is supported.
6 3-hole punch is supported.
7 4-hole punch is supported.
8 Option available on models 221 and 222 only.
9 Use only approved outdoor media in the outdoor media tray.
Media size supported
500-sheet input
Multipurpose tray
Envelope drawer8
2,000-sheet drawer
8
Outdoor media tray8
Banner tray8
Duplex
Standard output
5-bin mailbox
8 
Output expander
8 
Finisher to staple, 
hole punch, offset
stack or with output bin
8 
						

							
1-14Service Manual
5060-4
xx   
Input media types and weights
Media Weight
Integrated trays
f and optional 500-sheet drawer
Paper 
b, f Xerographic or  business paper 16 to 19.9 lb bond (60 to 74.9 g/m2 grain long)
20 to 47 lb bond (75 to 176 g/m2 grain long)
Specialty papers Gloss 
book 60 to 120 lb book (88 to 176 g/m
2 grain long)
Gloss cover 60 to 65 lb cover (162 to 176 g/m
2 grain long)
Card stock - upper limit 
(grain long)
a, f  Index 90 lb (163 g/m
2)
Bristol Tag 100 lb (163 g/m
2)
Cover 65 lb (176 g/m
2)
Card stock - upper limit (grain short)
 a, f
Index Bristol 110 lb (199 g/m2)
Tag 125 lb (203 g/m
2)
Cover 80 lb (216 g/m
2) 
Transparencies
i, j  Laser printer type 43 to 45 lb bond (161 to 169 g/m2)
Labels - upper limit Paper 48 lb bond (180 g/m
2)
Dual-web paper 48 lb bond (180 g/m
2)
Polyester 59 lb bond (220 g/m
2)
Vinyl 
g, h92 lb liner (300 g/m2)
Integrated forms Pressure sensitive  area 
c(140 to 175 g/m2)
Paper base (grain long) 20 to 36 lb bond (75 to 135 g/m
2)
Multipurpose Feeder 
Paper 
b, f Xerographic or  business paper 16 to 19.9 lb bond (60 to 74.9 g/m2 grain long) 
20 to 47 lb bond (75 to 176 g/m2 grain long)
Specialty papers Gloss book 60 to 120 lb book (88 to 176 g/m
2 grain long)
Gloss cover 60 to 65 lb cover (162 to 176 g/m
2 grain long)
Card stock - upper limit 
(grain long)
a, fIndex Bristol 90 lb (163 g/m2)
Tag 100 lb (163 g/m
2)
Cover 65 lb (176 g/m
2)
Card stock - upper limit 
(grain short) 
a, fIndex Bristol 110 lb (199 g/m2)
Tag 125 lb (203 g/m
2)
Cover 80 lb (216 g/m
2) 
Transparencies
 i, j Laser printer type 43 to 45 lb bond (161 to 169 g/m2)
Labels - upper limit
Paper 53 lb bond (199 g/m
2)
Dual-web paper 53 lb bond (199 g/m
2)
Polyester 59 lb bond (220 g/m
2)
Vinyl 
g, h78 lb liner (260 g/m2)
Integrated forms Pressure sensitive  area 
cUp to 47 lb bond (140 to 175 g/m2)
Paper base (grain long) 20 to 36 lb bond (75 to 135 g/m
2)
Envelopes 
d, e  Sulfite, wood-free or up  to 100% cotton bond 16 to 28 lb bond (60 to 105 g/m2) 
						

							
General information1-15
  5060-4xx
Output media types and weights
2,000-Sheet drawer 
Paper 
b, f Xerographic or 
business paper 16 to 19.9 lb bond (60 to 74.9 g/m2 grain long) 
20 to 47 lb bond (75 to 176 g/m2 grain long)
Specialty papers Gloss book 60 to 120 lb book (88 to 176 g/m
2 grain long) 
Gloss cover 60 to 65 lb cover (162 to 176 g/m
2 grain long)
a For 60 to 176 g/m2 paper, grain long fibers are recommended. For papers heavier than 176 g/m2, grain shor t 
is preferred.
b Paper less than 75 g/m2 limited to less than 60% relative humidity and is not supported in duplex.
c Pressure-sensitive area must enter the printer first.
d100% cotton content maximum weight is 24 lb bond. 28 lb envelopes are limited to 25% cotton content.
e 28 lb bond envelopes are limited to 25% cotton content.
f The duplex option supports the same types and weights as the printer except 16 to 19.9 lb (60 to 74.9 g/m2) 
grain long paper, transparencies, labels, envelopes or A5 card stock.
g Vinyl labels are supported only when printing environment and media are 20 to 23° C (68 to 90°F).
h Refer to the Converter Listing on Lexmarks Home Page and Automated FAX system ( LEXFAXSM) for 
information on whether your vinyl label converter has passed Lexmarks criteria. Refer to the  Card Stock and 
Label Guide  for more details.
i Lexmark transparency numbers 12A5940 and 12A5941 are supported from the standard tray, optional 500-
sheet trays and the multipurpose feeder.
j Lexmark transparency numbers 12A5150 and 12A5151 are supported from the multipurpose feeder only.
Media Weight
Standard output bin and optional output expander
Paper
b,  fXerographic or 
business paper 16 to 19.9 lb bond (60 to 74.9 g/m2 grain long) 
20 to 47 lb bond (75 to 176 g/m2 grain long)
Specialty papers Gloss book 60 to 120 lb book (88 to 176 g/m
2 grain long)
Gloss cover 60 to 65 lb cover (162 to 176 g/m
2 grain long)
Card Stock - Upper 
limit (grain long)
aIndex Bristol 90 lb (163 g/m2)
Tag 100 lb (163 g/m
2)
Cover 65 lb (176 g/m
2)
Card stock – upper 
limit (grain short) 
aIndex Bristol 110 lb (199 g/m2)
Tag 125 lb (203 g/m
2)
Cover 80 lb (216 g/m
2) 
Transparencies 
i,jLaser printer type 43 to 45 lb bond (161 to 169 g/m2)
Labels - upper limit Paper 48 lb bond (180 g/m
2)
Dual-web paper
k  48 lb bond (180 g/m2)
Polyester 59 lb bond (220 g/m
2)
Vinyl
g, h, k  92 lb liner (300 g/m2)
Integrated forms Pressure sensitive  area 
c Up to 47 lb bond (140 to 175 g/m
2)
Paper base
(grain long) 20 to 36 lb bond (75 to 135 g/m
2)
Envelopes 
d, e  Sulfite, wood-free or up  to 100% cotton bond 16 to 28 lb bond (60 to 105 g/m2)
Media Weight 
						

							
1-16Service Manual
5060-4
xx   
Finisher (Output bin, Offset Stack)
Paper 
b, fXerographic or 
business paper 16 to 19.9 lb bond (60 to 74.9 g/m2 grain long) 
20 to 47 lb bond (75 to 176 g/m2 grain long)
Specialty papers Gloss book 60 to 120 lb book (88 to 176 g/m
2 grain long)
Finisher (Staple and Hole Punch)
Paper Xerographic or  business paper 16 to 19.9 lb bond (60 to 74.9 g/m
2 grain long) 
20 to 32 lb bond (75 to 120.4 g/m2 grain long)
Specialty papers Gloss book 60 to 84.5 lb book (88 to 125 g/m
2 grain long)
5-Bin Mailbox
Paper Xerographic or  business paper 16 to 19.9 lb bond (60 to 74.9 g/m
2 grain long)
20 to 24 lb bond (75 to 90 g/m2 grain long)
a For 60 to 176 g/m2 paper, grain long fibers are recommended. For papers heavier than 176 g/m2, grain shor t 
is preferred.
b Paper less than 75 g/m2 limited to less than 60% relative humidity and is not supported in duplex.
c Pressure-sensitive area must enter the printer first.
d100% cotton content maximum weight is 24 lb bond. 28 lb envelopes are limited to 25% cotton content.
e 28 lb bond envelopes are limited to 25% cotton content.
f The duplex option supports the same types and weights as the printer except 16 to 19.9 lb (60 to 74.9 g/m2) 
grain long paper, transparencies, labels, envelopes or A5 card stock.
g Vinyl labels are supported only when printing environment and media are 20 to 23° C (68 to 90°F).
h Refer to the Converter Listing on Lexmarks Home Page and Automated FAX system ( LEXFAX) for 
information on whether your vinyl label converter has passed Lexmarks criteria. Refer to the  Card Stock and 
Label Guide  for more details.
i Lexmark transparency numbers 12A5940 and 12A5941 are supported from the standard tray, optional 
500-sheet trays and the multipurpose feeder.
j Lexmark transparency numbers 12A5150 and 12A5151 are supported from the multipurpose feeder only.
k The web oiler might be used for extensive use of vinyl or dual web labels. See  “Web oiler upgrade kit and 
replacements” on page 1-17 .
Media Weight 
						

							
General information1-17
  5060-4xx
Web oiler upgrade kit and replacements
The web oiler removes fuser roll contamination in machines which run a large number 
of vinyl or dual web labels. The web oiler works with all media types and enables the 
prolonged use of labels without sacrificing fuser life.
Web oiler fuser life : 200,000
Web oiler life: 100,000 pages
Ava i la b il ity: Order the web oiler upgrade kit.
Upgrade kit
This kit allows you to upgrade your current printer.
For replacements for the web oiler, see  “Web oiler fusers and web oiler replacements” on page 6-4 .
Description Part number
115 V web oiler upgrade kit 56P1555
220 V web oiler upgrade kit 56P1556
100 V web oiler upgrade kit 56P1557
The installation of the web oiler upgrade kit converts a standard 
Lexmark C76x printer to an oil web capable printer. The web oiler 
upgrade kit includes an oiler fuser and web oiler. 
						

							
1-18Service Manual
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xx   
Acronyms
BLDC Brushless DC Motor
BOR Black Only Retract
CCyan
CSU    Customer Setup
DIMM Dual Inline Memory Module
DRAM  Dynamic Random Access Memory
EDO Enhanced Data Out
EP     Electrophotographic Process
EPROM Erasable Programmable Read-Only Memory
ESD    Electrostatic Discharge
FRU    Field Replaceable Unit
GB Gigabyte
HCIT High-Capacity Input Tray
HCOF High-Capacity Output Finisher
HVPS  High Voltage Power Supply
ITU Image Transfer Unit
KBlack
LASER  Light Amplification by Stimulated Emission of Radiation
LCD    Liquid Crystal Display
LED    Light-Emitting Diode
LVPS Low Voltage Power Supply
M Magenta
MROM Masked Read Only Memory
MS Microswitch
NVRAM  Nonvolatile Random Access Memory
OEM    Original Equipment Manufacturer
OPT Optical Sensor
PC     Photoconductor
pel Picture element
POR Power-On Reset
POST  Power-On Self Test
PSD Position Sensing Device
PWM Pulse Width Modulation
RIP Raster Imaging Processor
ROM Read Only Memory
SDRAM Synchronous Dual Random Access Memory
SIMM Single Inline Memory Module
SRAM  Static Random Access Memory
UPR    Used Parts Return
V ac Volts alternating current
V dc Volts direct current
VTB Vacuum Transport Belt
YYellow 
						

							
Diagnostic information2-1
  5060-4xx
2.  Diagnostic information
Start
CAUTION:  Unplug power cord from the printer or electrical outlet before you connect or disconnect any cable or 
electronic board or assembly for personal safety and to prevent damage to the printer. Disconnect any 
connections between the printer and PCs/peripherals. The printer weighs 47.7 kg (105 lb.) and requires at 
least two people to lift it safely. Make sure your fingers are not under the printer when you lift or set the 
pr inter down.
To determine the corrective action necessary to repair a printer, look for the following information:
Does the POR stop? Check the  “POR (Power-On Reset) sequence” on page 2-2
Do you have a symptom, rather than an error message?
–“Symptom table - base printer” on page 2-3
–“Symptom table - 500-sheet drawer option” on page 2-4
–“Symptom table - HCIT 2000-sheet option” on page 2-4
–“Symptom table - output expander option” on page 2-4
–“Symptom table - 5-bin mailbox option” on page 2-5
–“Symptom table - finisher (HCOF) option” on page 2-5
If you have an error message or user message, check the following:
–“Error code table” on page 2-6
–“2xx Paper Jams” on page 2-15
–“User attendance messages” on page 2-27
–“Service checks” on page 2-41  for individual error messages
Additional information can be found at the following locations:
–“Sub error code table” on page 2-18
–“Understanding the printer operator panel” on page 2-21
–“Service checks” on page 2-41
Note:   There may be printer error messages that are not contained in this service manual. Call your next level 
support for assistance. 
						

							
2-2Ser vice Manual
5060-4
xx   
POR (Power-On Reset) sequence
The following is an example of the events that occur during the POR sequence for the base machine with no 
paper handling options installed.
1.Power the machine on.
2.+5V LED (Power ON) on the system board comes on.
3.Operator Panel LED comes on solid.
4.All diamonds appear on the display.
5.While loading code, dots scroll across the display.
6.The following is an example of the screen that displays after the code is loaded.
7.Performing Self Test is displayed.
8.Fuser drive motor turns on.
9.Fuser fan turns on.
10.RIP fan turns on.
11.Heartbeat LED on system boards turns on.
12.Fuser lamps turn on.
13.Vacuum transport belt fan turns on.
14.ITU Missing is posted if the ITU is missing.
15.Fuser Missing is posted if the fuser is missing.
16.Close Door is posted if the front cover is open.
17.Busy is displayed.
18.Operator panel LED blinks.
19.Redrive exit roller tur ns.
20.Any cartridge errors are posted such as a defective cartridge, Return Program information, or missing 
cartridge.
21.Any applicable maintenance messages display such as 80 Fuser Maintenance or 83 ITU Maintenance.
22.One of the toner low messages appears when applicable: 88 Yellow Toner Low, 88 Magenta Toner Low, 
88 Cyan Toner Low, or 88 Black Toner Low.
23.Color calibration may be initiated. This is displayed if one of the following occurs:
The printer detects at power on, or the front cover is closed, that a new or different toner cartridge has 
been installed.
The printer detects at power on when the cover is closed that a new or different ITU has been 
installed.
The printer detects at power on that the fuser temperature is below 60° C.
When coming out of power saver if power saver has been active for eight hours or longer.
If the printer is turned on when a calibration cycle was in progress since the printer was last powered 
off.
24.Ready is displayed.128MB 600Mhz
128MB = Amount of Memory 600Mhz = Processor Speed 
						

							
Diagnostic information2-3
  5060-4xx
Symptom tables
Symptom table - base printer
Symptom Action
Fuser fan fails to run or is noisy Go to  “925 error code” on page 2-85.
RIP fan fails to run or is noisy Go to  “927 error code” on page 2-86.
VTB fan fails to run or is noisy Go to  “926 error code” on page 2-85.
Excessive fuser drive motor assembly noise Go to  “Excessive fuser drive motor assembly 
noise” on page 2-124 .
Machine inoperative: Fans don’t turn, engine not on, 
lights not on, and none of the printer functions work. Go to 
“AC and DC power service check” on 
page 2-105.
Close Door displays constantly, unable to clear the 
message, POR incomplete Go to 
“Close door/HVPS/printhead interlock switch 
service check” on page 2-110 .
Operator panel: One or more buttons do not work Go to  “Operator panel LCD/status LED/buttons 
service check” on page 2-125 .
Operator panel: Display is blank, printer does not 
sound 5  beeps, but printer is not inoperative Replace the 
“Operator panel” on page 4-53 .
Operator Panel: Operator panel displays all diamonds 
continuously, sounds 5 beeps, and POST inoperative Go to 
“Operator panel LCD/status LED/buttons 
service check” on page 2-125 .
Operator panel: One pel or random pels are missing Replace the  “Operator panel” on page 4-53.
Paper feed problems, base printer Go to  “2xx Paper Jams” on page 2-15.
Paper feed problems, integrated tray Go to  “Tray 1 service check” on page 2-142.
Printer prints black only, no colors Make sure that the printer is not set up to print black  only. If the printer is set up correctly, check the Black 
Retract Motor and gears for correct operation. If the 
gears are operating correctly, replace the Retract 
Motor Assembly. If this does not correct the problem, 
go to “Black only retract (BOR) service check” on 
page 2-109 .
Print quality: 100% single color printed  All black print
 All cyan print
 All magenta print
 All yellow print Go to 
“Entire page is mostly one color—Full bleed 
planes in one color” on page 2-131 .
Print quality: Blank page (no image) Go to  “Blank page (no image)” on page 2-130.
Print quality: Evenly spaced horizontal marks or lines 
on the printed page Go to 
“Vertical lines or streaks” on page 2-134 .
Print quality: Black line Black horizontal lines are most likely caused by a  shorted charge roll in the print cartridge. Replace the 
black print cartridge.
Print quality: Magenta, cyan, or yellow lines. “Vertical lines or streaks” on page 2-134 or 
“Horizontal lines or streaks” on page 2-134 .
Print quality: Colored lines, streaks, or smudges Go to  “Vertical lines or streaks” on page 2-134 or 
“Horizontal lines or streaks” on page 2-134 .
Print quality: Light lines or streaks appear on the 
printed page Go to 
“Light lines or streaks appear on the page” 
on page 2-139 .
Print quality: Light print Go to  “Light print over the entire page” on 
page 2-133 . 
Print quality: Missing colors Go to 
“Missing colors—Complete or partially 
missing color planes” on page 2-132 .
Print quality: Uneven printing Go to  “Uneven printing” on page 2-137. 
						

							
2-4Ser vice Manual
5060-4
xx   
Symptom table - 500-sheet drawer option
Symptom table - HCIT 2000-sheet option
Symptom table - output expander option
Print quality: Poor color alignment Go to “Poor color alignment” on page 2-136.
Print quality: Toner on the back of the page Go to  “Toner is on the back of the printed page” on 
page 2-139 .
Print quality: Toner smears or rubs off the page Go to  “Toner smears or rubs off the page with no 
error code displayed” on page 2-138 .
Print quality: Multiple horizontal lines Go to  “Vertical lines or streaks” on page 2-134
Symptom Action
Printer fails to recognize the option is installed Go to  “The base printer does not recognize that 
tray x is installed.” on page 2-102 .
The tray  x autocompensator fails to retract, stays in 
down position Go to 
“Tray x autocompensator fails to retract, 
stays in down position.” on page 2-103 .
Paper Low message appears when adequate paper 
is installed (tray  x) Go to 
“The printer detects paper low in tray x when 
adequate paper is installed in the tray.” on 
page 2-103 .
Paper Out message appears when adequate paper is 
installed (tray  x) Go to 
“The printer detects paper out in tray x when 
adequate paper is installed in the tray.” on 
page 2-104 .
Tr a y   x does not detect size media is installed Go to  “Tray x does not detect size media installed” 
on page 2-104 .
Paper jams in the option tray Go to  “2xx Paper Jams” on page 2-15.
Symptom Action
Printer fails to recognize the option is installed Go to  “Printer does not recognize that the HCIT 
2000-sheet option is installed.” on page 2-122 .
HCIT does not function. There is no response. The 
HCIT is inoperative. Go to 
“HCIT inoperative” on page 2-123 .
HCIT does not recognize the correct paper size Go to  “HCIT 2000-sheet option does not recognize 
the size paper selected.” on page 2-124 .
Paper jams in the HCIT Go to  “2xx Paper Jams” on page 2-15.
Symptom Action
Printer fails to recognize the option is installed. The 
paper feeds into the standard bin. Go to 
“Output expander option service check” on 
page 2-127 .
Remove Paper - Output Bin  x is displayed and cannot 
be cleared Go to 
“Remove Paper - Output Bin x is displayed, 
POST is incomplete unable to clear the message.” 
on page 2-128
Printer does not display Output Bin Full Go to  “No indication that bin x is full or no 
indication that bin x is near full.” on page 2-129 .
Excessive static electricity buildup Go to  “Problems with excessive static electricity 
buildup.” on page 2-129 .
Symptom Action