Lexmark C760 Service Manual

							
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Energy Conserve
When Energy Conserve is on, the customer does not have access to disable the Power Saver function. When 
Energy Conserve is off, Disable appears as an additional menu item in the Power Saver menu. This setting only 
affects the values that are displayed in the Power Saver Menu.
1.Select Energy Conserve  from the Config Menu.
2.Select On or  Off.
Auto Color Adjust
Automatic color adjustments periodically occur during printing, based on internal algorithms The following 
situations prompt the adjustment:
If the printer detects a new or different color cartridge is installed, usually at power on or when the cover is 
closed.
If the printer detects a new or different ITU is installed, usually at power on or when the cover is closed.
If the fuser detects at power on that the fuser temperature is at 60° C. 
If Power Saver has been active for eight hours or more.
If the printer was turned off during a calibration cycle.
At the Ready state, if one of several internal engine parameters has exceeded a given threshold.
If requested by the user from the operator panel or by a PJL command.
At the Ready state if more than 500 pages are printed since the last calibration. This value can be adjusted 
in this menu. 
Selecting Off disables all Auto Color Adjust prompts listed above except the request of the user or the PJL 
command.
1.Select  Auto Color Adjust  from the Config Menu.
2.Select Off or a value from 100 to 1000. The default value is 500.
Use  Menu  to increase the value.
The values are in increments of 50. The default is 500 pages. The number refers to how many pages since the 
last calibration before recalibration begins automatically.
ERROR LOG
The history of printer errors can be printed by selecting  Print Log.
Note:   This log can be printed from Diagnostics mode or the Configuration Menu, but the report from 
Configuration menu contains the debug and secondary error codes that do not print version from the 
Diagnostics mode. The errors printed here do not necessarily match in number or in order those printed with 
Display Log in Diagnostics. However, you can select additional options in Diagnostics mode, including Display 
Log and Clear Log. For additional information, see  “ERROR LOG” on page 3-35. Errors are also shown on the 
Print Quality Pages.
Font Sharpening
Font Sharpening allows the user to adjust the value of the high frequency screens used for font data. For 
example, if the value is 24, all fonts 24 points and less use the high frequency screens. 
1.Select  Font Sharpening  from the Config Menu.
2.Select a value from 1 to 150. The default value is 24.
Use Menu  to increase the value.The increment is 1.
This feature only works in PostScript emulation. 
						

							
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Paper Prompts
Setting Paper Prompts controls which tray a change prompt is directed to when paper is sensed to be the wrong 
size.
1.Select Paper Prompts  from the Config Menu.
2.Select Auto, MP Feeder , or Manual Paper .
Env Prompts
Env Prompts controls which tray a change prompt is directed to when the envelopes are sensed to be the wrong 
size.
1.Select Env Prompts from the Config Menu.
2.Select Auto, MP Feeder , or Manual Envelope .
Exit Config Menu
Press Select  to exit the Configuration Menu and reboot the printer. 
						

							
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Diagnostics mode
To run the printer diagnostic tests described in this chapter, put the printer in Diagnostics mode.
The tests display on the operator panel in the order shown:
REGISTRATION
ALIGNMENT MENU
TOP FINE MARGIN ADJ
MISC TESTS
PRINT TESTS
HARDWARE TESTS
DUPLEX TESTS (if installed)
INPUT TRAY TESTS
OUTPUT BIN TESTS
FINISHER TESTS (if installed)
BASE SENSOR TEST
DEVICE TESTS (if optional flash or disk installed)
PRINTER SETUP
EP SETUP
ERROR LOG
DEV MENU
EXIT DIAGNOSTICS
Entering Diagnostics mode
To enter the Diagnostics Mode:
1.Turn the printer off.
2.Press and hold the  Go and  Return  buttons.
3.Turn the printer on.
4.Release the buttons when  Performing Self Test  is displayed.
Exiting the Diagnostics mode
Select EXIT DIAGNOSTICS  to exit the Diagnostics mode and return to normal mode. 
						

							
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REGISTRATION
Use REGISTRATION to align the black image on the page. Use ALIGHNMENT to align the individual colors. The 
black image should be aligned before the individual colors are aligned.
To set Registration:
1.Select REGISTRATION  from the Diagnostics Mode.
B=Bottom margin
T=Top margin
L=Left margin
R=Right margin
s=Negative values, space blank for positive values
xx =Margin value
*=Current value
2.Press  Go to print the Quick Test Page. Current margin settings are listed on the printout.
3.Determine how values should change to align the arrows to the top, bottom, right, and left margins. Align 
the Registration Line to the edge of the page.
The print registration range is:
Note:   Adjusting the Top and Right margins moves the entire image. Adjusting the Bottom and Left margins 
causes the image to expand or compress. It is easier to adjust the Top and Right margins, first, then adjust 
the Bottom and Left. T=sxx* B=s
xx*
L=sxx* R=s xx*
Top Margin:  -25  to +25 Increasing the value moves the image down the page. Always adjust  the top before the bottom margin.
Bottom Margin:  -25 to +25 Increasing the value stretches the image toward the bottom of the  page.
Right  Margin:  -15  to +15 Increasing the value moves the image to the left on the page. Always  adjust the right before the left margin.
Left Margin:  -15 to +15 Increasing the value stretches the image toward the left margin. 
						

							
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4.Enter the values.
The Top margin sign/value pair  blinks. This indicates it is the margin value being changed.
To select the margin value to change, press  Select until the margin value pair you want to change is 
blinking .
To change the margin value press  Menu. 
When the value you want is displayed, press  Select to save the value. 
5.To verify the margin values are correct print the Quick Test Page from the registration screen. Press  Go to 
print the test page. While printing, Quick Test Printing is displayed. Once printing is complete, the 
Registration screen appears. See a sample of the  “Quick Test Page” on appendix page B-8.
Print the Quick Test Page on letter or A4 paper.
6.To exit the Registration menu, press  Return. 
ALIGNMENT MENU
Aligns the image on the page for the individual colors: cyan, yellow and magenta. The black image should be 
aligned using REGISTRATION before the individual colors are aligned.
Selections include:
CYAN
YELLOW
MAGENTA
Setting alignment for color1.
Select  ALIGNMENT MENU  from the Diagnostics mode.
2.Select  CYAN, YELLOW , or MAGENTA .
The following screen is displayed:
3.Press  Go to print Alignment Test pages before changing any of the settings. See  “Printhead electronic 
alignment test page—Magenta (one of two)” on appendix page B-10  for an example of the magenta 
pages in color. 
Note:   The Alignment Test Pages should be printed on A4 or Letter paper.
The printer tries to print the test page from the default paper source, however if the default source only 
supports envelopes, then the page prints from Tray 1. 
4.Determine which settings to change and follow the instructions on the printed sheets to determine the 
adjustment.
5.Change the values.
When the alignment screen is displayed, the Top Margin sign/value pair flashes. To change the value, 
press  Menu to increase or decrease. Once the value is displayed, press  Select to save the value and 
move to the next value. 
The margin values  blink in the following order: Top, Left, Right and Theta (Z). To skip a margin value, 
because its value is correct, press  Select. The current value remains the same.
T=s
xx* R=s xx* 
L=s xx* Z=s xx*
Value: Description: Range:
T = Top Margin Offset  -127 to +127
L = Left Margin Offset  -300 to +300
R = Right Margin Offset  -350 to +350
Z = Theta Offset (Skew 
compensation)  -16 to +16
s =sign for negative values (this space is blank for positive values)
xx =margin value
* =Current value 
						

							
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6.Press Go to reprint the Alignment Test Pages to confirm your adjustments on page 1. Repeat steps 4 
through 6 if required.
7.Continue until all three colors are aligned.
8.Press  Return  to exit the ALIGNMENT MENU.
Drift Sensors
This check is used to display the status of the thermal system used to compensate for printhead drift.
The following screen is displayed when the test is selected:
Values:
If Com=Err, replace the system board. See  “System board” on page 4-72.
If a number, C, Y, or K=OP, or SH, check the following:
1.Check the cable of the appropriate thermistor (cyan, magenta, yellow, or black) to make sure it is installed 
correctly to the system board and to the thermistor board. If correct, go to step 2.
2.Check the continuity of the appropriate cable. Replace the cable if there is no continuity. If continuity is 
correct, go to step 3.
3.Replace the appropriate thermistor assembly. If this does not fix the problem, replace the system board.
To exit the test, press  Return or Stop .
TOP FINE MARGIN ADJ
Do not change this setting without consulting your next level of support. Com=
aaaa  M=bb
C= cc  Y= dd  K=ee
If: Value: Description:
Com= Err RIP to A/D communication error
Com= Good Communication is good
M=, C=, Y=, or K= OP Open thermistor error
M=, C=, Y=, or K= SH Short thermistor error
M=, C=, Y=, or K= RA Range error
M=, C=, Y=, or K= Number Detected temperature in Celsius of last  reading. Indicates the system is functioning 
properly. 
						

							
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MISC TESTS
Motor Detect
This test initiates an Automated Motor Detection. It must be performed if the NVRAM contents are lost during the 
replacement of a paper size sensing board. This test must also be performed anytime the ITU motor, fuser 
motor, or cartridge drive motors are replaced.
To run the Motor Detect:
1.Remove all the print cartridges from the printer and close the cover.
2.Select Motor Detect  from MISC TESTS.
3.Press Go.
Motor Detection in Progress  is displayed.
The test lasts approximately ten seconds. No buttons are active during detection and the test completes 
automatically.
Toggle ITU
The test is used to verify that ITU belt retraction, BOR, hardware is functioning properly. Two options are 
available: Raise Belt and Lower Belt. If the belt is already in the requested position, no action occurs. Otherwise 
the belt will move to the requested position.
1.Select  Toggle ITU  from the menu.
2.Select Raise Belt  or Lower Belt , from the menu.
The following screens display for the test selected:
3.To exit the test, press any button. Toggle ITU
=Raise Belt
Toggle ITU
=Lower Belt 
						

							
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Belt Tracking (ITU 4th point adjustment)
This test is used to determine the need for the ITU Shim to correct 4th point alignment following the ITU 
replacement.
Note:  Remove all cartridges before initiating this test and note the belt position.
1.Select Belt Tracking  from the menu. 
The following screen is displayed:
The operation normally takes approximately 15 minutes to complete. It may take less time if the test fails.
When the test is complete, the following screen is displayed:
or
If the test is successful, the pass code will be a number between - 250 and + 250. Do not install a shim.
If the test fails, then a fail code will be a number between 0 and 200 and a message indicates the cause of 
the failure. The following is a list of failure codes:
Cover open.
Cartridges NOT removed.
Less than three revolutions before the test ended (may never be displayed). Belt tracked to front.
100 revolutions when test ended, belt tracked to front.
103 
						

							
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PRINT TESTS
The Print Tests consist of the following tests:
Tr a y  1
Tray 2 (if installed)
Tray 3 (if installed)
Tray 4 (if installed)
Tray 5 (if installed)
MP Feeder
Print Quality Pgs
For examples of the Print Quality Pages, see  “Print tests” on appendix page B-3.
Print Tests (input sources)
This test determines if the printer can print on media from any of the paper input sources. Each of the installed 
sources is available within the Print Tests menu.
The content of the test page varies depending on the media installed in the selected input source.
If a source is selected that contains paper, then a page similar to the Quick Test Page is printed and does 
not contain the Print Registration diamonds. 
If a source is selected which contains envelopes, then an Envelope Print Test pattern is printed. This 
pattern only contains text, which consists of continuous prints of each character in the selected symbol set. 
If Continuous  is selected, all sources printing with paper sizes prints the same page continuously until the 
test is stopped. If continuous is selected from a source which contains envelopes then the envelope print 
test pattern is printed on the first envelope and the rest are blank.
The Print Test page always prints single sided, regardless of the Duplex setting or the presence of the Duplex 
option.
To run the Print Test:
1.Select  PRINT TESTS  from the menu.
2.Select the paper source from the menu.
3.Select either Single or Continuous  from the menu.
Note:   If Single  is selected, no buttons are active while the Print Test Page is printing. If  Continuous is 
selected,  Return or Stop  can be pressed to cancel the test.
The following screen is displayed while printing.
4.Press  Return  or Stop  at the end of the test to return to the original screen.
Print Quality Pgs
The print quality test consists of five pages. Pages one and two contain a mixture of graphics and text. The 
remainder of the pages only contain graphics. See  “Print tests” on appendix page B-3 for samples of the Print 
Quality Pgs.
This test may be printed from either Configuration Menu or the Diagnostics mode. To run the print quality pages 
from the Diagnostics mode, select  PRINT TESTS and Print Quality Pgs  from the menu. Once the test is started 
it cannot be canceled. When the test pages print the printer returns to the original screen. <
input source >
Printing        < media width>
< input source > Tray 1, Tray 2, Tray 3, Tray 4, Tray 5, MP Feeder, or Env Feeder
< media width > N or Narrow Width Media, or W for Wide Width Media 
						

							
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HARDWARE TESTS
The following hardware tests can be selected from this menu:
LCD Test
Button Test
DRAM Test
CASCHE Test
ROM Test
Parallel Wrap (if available)
Serial Wrap (if available)
Serial 1 Wrap (if available)
Serial 2 Wrap (if available)
Serial 3 Wrap (if available)
LCD Test
This test verifies the operator panel LCD function.
To run the LCD Test:
1.Select  LCD Test  from HARDWARE TESTS in the Diagnostics mode.
The LCD test continually executes.
2.Press  Return  or Stop  to cancel the test.
Button Test
This test verifies the operator panel button function.
To run the Button Test:
1.Select  Button Test  from HARDWARE TESTS in the Diagnostics mode.
With no buttons pressed, several OP (Open) messages are displayed.
2.Press each button one at a time and a CL (Closed) displays in place of OP. The proper operation of each 
button can be checked.
3.Press  Return  or Stop  to cancel the test.
OP OP OP OP
OP OP