Lexmark C736 Service Manual

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To run the Quick Test (duplex):
1.Select Quick Test from DUPLEX TESTS, and press Select ().
2.Select Single or Continuous, and press Select (). 
•The single Duplex Quick test cannot be canceled.
•The printer attempts to print the Quick Test Page from the default paper source. 
•Check the Quick Test Page for the correct offset between the placement of the first scan line on the 
front and back side of a duplexed sheet.
The single test stops automatically when a single duplex sheet is printed, and the continuous test continues until 
you press Stop (
).
Print Test (duplex)
This test provides service personnel with a way to verify the function of the printer’s duplex hardware. After the 
user selects this test, the device automatically executes a continuous print test that generates a duplexed, color 
output page. To stop the test, the user must press Stop ( ). While this test executes, the power indicator light 
blinks green and the panel displays “DUPLEX TESTS Printing...”.
The paper you choose to print the page on should be either Letter or A4.
To run the Print Test (duplex):
1.Select DUPLEX TEST in the Diagnostics Menu, and press Select ().
2.Select Print Test, and press Select ().
The printer executes a continuous print test that generates a duplexed, color output page.
3.To stop the test, press Stop ().  
						

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Skew (duplex)
This setting adjusts the duplex motor speed when it feeds through the aligning roll. It controls the skew between 
the first scan line and the top of the page. Adjustments are made to the image that is facedown in the output 
tray.
To set the Skew (duplex):
1.Select DUPLEX TESTS in the Diagnostics Menu, and press Select ().
2.Select Quick Test, and press Select ().
3.Select Single, and press Select ().
The test page prints.
4.Look at the dotted arrows at the top of the page. If the page is skewed on the page, select Skew, and press 
Select ().
5.Use   or   to select the skew setting you need to change.
•Each increment shifts the skew by about 6 pixels at 600 dpi.
•The Skew (duplex) range is -50 to +50, and the default value is 0.
•An increase moves the image at the top right down the page. A decrease moves the image at the top 
right up the page.
6.Print the Quick Test again to verify the adjustment. Check the page to see if the image on the page is still 
skewed. If it is, repeat the adjustment. If not, proceed to step 7.
Top Margin (duplex)
This setting controls the offset between the first scan line on the front of the duplex page and the first scan line 
on the back of the page. The duplex adjustments are made to the image that is face down in the output tray. 
Therefore, be sure to set the top margin in REGISTRATION before setting the duplex top margin. See 
“Registration” on page 3-5.
To set the Top Margin (duplex):
1.Select DUPLEX TESTS in the Diagnostics Menu, and press Select ().
2.Select Quick Test, and press Select ().
3.Select Single, and press Select ().
The test page prints.
4.Hold the page to the light to see whether the top margin of the back aligns with the top margin of the front.
5.If they do not match, select Top Margin, and press Select ().
6.Use   or   to select the margin setting you need to change.
•Each increment shifts the duplex top margin by 1/100 of an inch. 
•The Top Margin (duplex) range is -25 to +25, and the default value is 0.
•An increase moves the top margin down and widens the top margin. A decrease moves the top 
margin upward and narrows the top margin.
7.Press Select ().
8.Print the Quick Test again to verify the adjustment. Repeat until the front and back top scan lines match.
Left Margin (duplex)
By modifying this setting you can shift the image on the back side of a duplex page to the right or to the left.
To set the Left Margin (duplex):
1.Select DUPLEX TESTS in the Diagnostics Menu, and press Select ().
2.Select Quick Test, and press Select ().
3.Select Single, and press Select ().
The test page prints.
4.Hold the page to the light to see whether the left margin of the back aligns with the left margin of the front.
5.If they do not match, select Left Margin, and press Select (). 
						

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6.Use   or   to select the margin setting you need to change.
•Each increment shifts the duplex left margin by 4 pixels at 600 dpi (0.00666 inches or 0.1693 mm). 
•The Left Margin range is -50 to +50, and the default value is 0.
•An increase moves the margin to the right, and a decrease moves the margin to the left.
Sensor Test
There are two groups of sensors tests, static sensors and dynamic sensors. 
To run the Sensor Test:
1.Select SENSORS in Diagnostics Menu, and press Select ().
2.Select Static Sensors or Dynamic Sensors, and press Select ().
•For static sensors—view the current status. Exit menus and re-enter to change state.
•For dynamic sensors—view the current status and toggle the state to test the sensor.
3.Select the particular sensor you need to test, and Select (). 
Press Back() or Stop( ) to exit the test.
Sensor type Sensor name Possible values Sensor activation
Static sensorsWaste Toner Empty, Full, or 
MissingN/A
Belt Waste Empty or 
percentage fullN/A
Fuser Temp Degrees (C) N/A
Fuser BUR Temp Degrees (C) N/A
Power Voltage Open and close the front access door.
Dynamic 
sensorsFuser Exit  Open/Closed Open the top access cover. Activate the fuser 
exit flag. The sensor should change state.
Input Open/Closed Remove the paper tray 1. Activate the input 
sensor flag. The sensor should change state.
Front Door Open/Closed Open the front door. The sensor should 
change state.
Narrow  Media Open/Closed Test the MP feeder tray by inserting a sheet of 
paper, and pushing up to sensor. The sensor 
should change state. 
K Toner Open/Closed Remove the black toner cartridge. Shine a 
flashlight on the toner level sensor. The 
sensor should change state.
M Toner Open/Closed Remove the magenta toner cartridge. Shine a 
flashlight on the toner level sensor. The 
sensor should change state.
C Toner Open/Closed Remove the cyan toner cartridge. Shine a 
flashlight on the toner level sensor. The 
sensor should change state.
Y Toner Open/Closed Remove the yellow toner cartridge. Shine a 
flashlight on the toner level sensor. The 
sensor should change state.
TPS (toner patch 
sensor)Open/Closed Open the front access door. Slip a piece of 
paper between the TPS and the transfer 
module. The sensor should change state.
Bubble Open/Closed Open the front door. Activate the fuser entry 
flag. The sensor should change state.
Other SensorsBin Full Test Open/Closed Move the bin full sensor flag (located on the 
fuser) up and down to toggle the sensor state. 
						

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Printhead Tests
Mirror Motor Test
1.
Select PRINTHEAD TESTS in DIAGNOSTICS, and press Select ().
2.Select Mirror Motor Test, and press Select ().
The panel displays Mirror Motor Test—Motor Running…. 
After the test completes, the panel displays either Pass or Fail.
To stop the test, press Back() or Stop ().
Servo Laser Test
1.
Select PRINTHEAD TESTS from DIAGNOSTICS, and press Select ( ). 
2.Select Servo Laser Test, and press Select ().
The panel displays Servo Laser Test—Motor Running…. After the test completes, the panel displays either Pass 
or Fail.
To stop the test, press Back() or Stop ().
Device Tests
These tests only appear if the flash or disk option is installed.
Quick Disk Test
This test performs a non-destructive read/write on one block per track on the disk. The test reads one block on 
each track, saves the data, and proceeds to write and read four test patterns to the bytes in the block. If the 
block is good, the saved data is written back to the disk.
To run the Quick Disk Test:
1.Select DEVICE TESTS in Diagnostics Menu, and press Select ().
2.Select Quick Disk Test, and press Select ().
•The power indicator blinks while the test is in progress.
•Quick Disk Test/Test Passed is displayed if the test passes and the power indicator turns on solid.
•Quick Disk Test/Test Failed is displayed if the test failed and the power indicator turns on solid.
You cannot stop the test while it is running, but when it is complete, press Stop ( ) to return to DEVICE 
TESTS. 
						

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Disk Test/Clean
Warning:This test destroys all data on the disk and should not be attempted on a good disk. This test may run 
approximately 1½ hours depending on the disk size.
To run the Disk Test/Clean Test:
1.Select DEVICE TESTS in the Diagnostics Menu, and press Select ().
2.Select Disk Test/Clean, and press Select ().
Files will be lost/Go or Stop? is displayed to warn the user.
3.To exit the test immediately and return to DEVICE TESTS, press Back () or Stop ( ). To continue with 
the test, press Select ().
If  is selected, Disk Test/Clean/BAD:000000 00% is displayed. The screen updates periodically, 
indicating the percentage of test completed and the number of bad blocks found.
4.The power indicator blinks during the test. The test can be canceled anytime during the test by pressing 
Back () or Stop ( ). 
•Once the test is complete, the power indicator turns on solid and a message displays. 
•xxxx Bad Blocks/yyyyyy Usable is displayed if fewer than 2000 bad blocks are detected. xxxx 
indicates the number of bad blocks, and yyyyyy indicates the number of usable blocks.
•xxxx Bad Blocks/Replace Disk is displayed if more than 2000 bad blocks are detected. The disk 
cannot be recovered because too many bad blocks exist on the disk.
5.Press Back () or Stop ( ) to return to DEVICE TESTS.
Flash Test
This test causes the file system to write and read data on the flash to test the flash.
Warning:This test destroys all data on the flash because the flash is reformatted at the end of the test.
To run the Flash Test:
1.Select DEVICE TESTS in the Diagnostics Menu, and press Select ().
2.Select Flash Test, and press Select ().
•The power indicator blinks while the test is running.
•Flash Test/Test Passed is displayed if the test passes and the power indicator turns on solid.
•Flash Test/Test Failed is displayed if the test fails and the power indicator turns on solid.
3.Press Back () or Stop ( ) to return to DEVICE TESTS. 
						

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Printer Setup
Defaults
U.S./Non-U.S. defaults changes whether the printer uses the U.S. factory defaults or the non-U.S. factory 
defaults. The settings affected include paper size, envelope size, PCL symbol set, code pages, and units of 
measure.
Warning:Changing this setting resets the printer to factory defaults, and data may be lost. It cannot be undone.
Page Counts
You can view, but not change any of the three counts displayed under PAGE COUNTS.
To view the Prt Color Pg Count, the Prt Mono Pg Count, or the Perm Page Count:
1.Select PRINTER SETUP from DIAGNOSTICS, and press Select ().
2.Select PAGE COUNTS, and press Select ().
3.Select the page count you wish to view:
•Prt Color Pg Count
•Prt Mono Pg Count
•Perm Page Count
Press Back (
) to return to PRINTER SETUP.
Serial Number
The serial number can only be viewed and cannot be changed.
To view the serial number:
1.Select PRINTER SETUP from DIAGNOSTICS, and press Select ().
2.Select Serial number, and press Select ().
Press Back (
) to return to PRINTER SETUP.
Engine Setting 1 through 4
Warning:Do not change these settings unless requested to do so by your next level of support. 
Model Name
The model name can only be viewed and cannot be changed.
Configuration ID
The two configuration IDs are used to communicate information about certain areas of the printer that cannot be 
determined using hardware sensors. The configuration IDs are originally set at the factory when the printer is 
manufactured. However, the servicer may need to reset Configuration ID 1 or Configuration ID 2 whenever the 
system board is replaced. The IDs consist of eight digits. The first seven digits in each ID are hexadecimal 
numbers, while the last digit is a checksum of the preceding seven digits. Each ID can contain a combination of 
the digits 0 through 9, and A through F.
Note:  When the printer detects a Configuration ID that is not defined or invalid, the following occurs:
•The default standard model Configuration ID is used instead.
•Configuration ID is the only function available in DIAGNOSTICS.
•Unless the menu is in DIAGNOSTICS, Check Config ID displays.  
						

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To set the configuration ID:
1.Select Printer Setup from the Diagnostic mode.
2.Select Configuration ID from the Printer Setup menu.
Submitting Selection displays, followed by the value for Configuration ID 1.
3.Enter the Configuration ID 1.
•To select a digit or character to change, press   or   until the digit or character is underlined.
•To change a digit or character, press  to increase or   to decrease the value.
•After the last digit is changed, press Select ( ) to validate the Configuration ID 1.
If Invalid ID appears, the entry is discarded, and the previous Configuration ID 1 is displayed on the 
screen.
If the process is successful, Submitting Selection appears on the display, followed by the current 
value for Configuration ID 2.
4.Repeat the steps for entering the Configuration ID, and press Select ().
If the Configuration ID 2 is validated, Submitting Selection appears, and a check ( ) appears next to 
Printer Setup. 
Note:  The printer will NOT perform an automatic POR after the Configuration IDs are accepted.
Reset color calibration (Reset Color Cal)
The Reset Color Cal enables the alignment of the color planes using pre-programmed values. Automatic Color 
Adjust Calibration may be more effective.
1.Select PRINTER SETUP in the Diagnostics Menu, and press Select ().
2.Select Reset Color Cal, and press Select ().
The following screen displays:
Then the following screen is displayed:
3.The printer returns to the previous screen when calibration is complete.
Parallel 1 strobe adjustment (Par 1 Strobe Adj)
Note:  This setting appears only if the printer has a parallel port available in the PCI slot 1. 
This setting enables the servicer to adjust the amount of time the strobe is sampled in order to determine if valid 
data is available on the parallel port. The range of values is -4 to 6. Each time this value is incremented by 1, the 
strobe is sampled 50 ns (nanoseconds) longer. Each time this value is decreased by 1, the strobe is sampled 50 
ns less often. When the value of this setting is 0, the factory default is used to determine the length of time the 
strobe is sampled. If the servicer, for example, decreased the value from 0 to 3, the strobe will be sampled for 
150 ns longer than the factory setting.
Motor Calibration
This test is run to calibrate the leading edge of the paper to each transfer station.
1.Select MOTOR TESTS from DIAGNOSTICS, and press Select (). 
2.Select Motor Calibration, and press Select ().
The printer generates eight pages as part of this test.
To stop the test, press Stop (). PRINTER SETUP
Reset Calibration
Resetting
Calibration 
						

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EP Setup
EP Defaults
This setting is used to restore each printer setting listed in EP SETUP to its factory default value. Sometimes this 
is used to help correct print quality problems.
To restore EP Defaults:
1.Select EP SETUP from DIAGNOSTICS, and press Select ().
2.Select EP Defaults, and press Select ().
3.Select Restore to reset the values to the factory settings, and select Do Not Restore to exit without 
changing the settings.
Fuser temperature (Fuser Temp)
This adjustment can be used to help solve some customer problems with paper curl on low grade papers and 
problems with letterheads on some types of media. 
The fuser temperature can be adjusted to: Low, Normal, High. The default is Normal.
DC Charge Adjust, Dev Bias Adj, Transfer Adjust
Each of these three settings enables you to adjust the high voltage levels controlling the electrophotographic 
process. You will use these settings to compensate for unusual operating circumstances such as high humidity. 
The printer uses the value of these settings together with other settings to calculate printing speed and media 
selection.
Reports
Menu Settings Page
The Menu Settings Page is a list of DIAGNOSTICS settings with the current value.
Event Log
Display Log
The event log provides a history of printer errors. It contains the 12 most recent errors that have occurred on the 
printer. The most recent error displays in position 1, and the oldest error displays in position 12 (if 12 errors have 
occurred). If an error occurs after the log is full, the oldest error is discarded. Identical errors in consecutive 
positions in the log are entered, so there may be repetitions. All 2xx and 9xx error messages are stored in the 
event log.
To view the event log:
1.Select EVENT LOG from DIAGNOSTICS, and press Select ().
2.Select Display Log, and press Select ( ). 
Up to three error codes display at a time. Press  or  to view additional error codes. Press   to view 
additional details.
Press Back (
) to return to the EVENT LOG menu. 
						

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Print Log
Additional diagnostic information is available when you print the event log from DIAGNOSTICS rather than 
CONFIG MENU. 
The Event Log printed from DIAGNOSTICS includes:
•Detailed printer information, including code versions
•Time and date stamps
•Page counts for most errors
•Additional debug information in some cases
The printed event log can be faxed to Lexmark or your next level of support for verification or diagnosis.
To print the event log:
1.Select EVENT LOG from DIAGNOSTICS, and press Select ().
2.Select Print Log, and press Select ().
Press Back ( ) to return to EVENT LOG. 
Clear Log
Use Clear Log to remove the current information in the Event Log. This affects both the viewed log and the 
printed log information.
1.Select EVENT LOG in DIAGNOSTICS, and press Select ().
2.Select Clear Log, and press Select ().
3.Select YES to clear the Event Log or NO to exit the Clear Log menu, and press Select ().
If YES is selected, Deleting EVENT LOG displays on the screen.
Press Back ( ) to return to EVENT LOG.
EXIT DIAGNOSTICS
Press Select ( ) to exit DIAGNOSTICS. The printer performs a power-on reset and returns to normal mode. 
						

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Configuration menu (CONFIG MENU)
Available tests
The tests display on the operator panel in the order shown. 
Reset Fuser Cnt See “Reset Fuser Cnt” on page 3-25. 
Color Lock Out  See “Color Lock Out” on page 3-25.
Prt Quality Pgs See “Prt Quality Pgs” on page 3-25. 
Reports
Menu Settings Page See “Menu Settings Page” on page 3-26.
Event Log See “Event Log” on page 3-26.
Color Trapping See “Color Trapping” on page 3-26. 
SIZE SENSING See “Size Sensing” on page 3-26. 
Panel Menus See “Panel Menus” on page 3-26. 
PPDS Emulation See “PPDS Emulation” on page 3-27. 
Download Emuls (if available) See “Download Emuls” on page 3-27. 
Demo Mode See “Demo Mode” on page 3-27. 
Factory Defaults See “Factory Defaults” on page 3-27. 
Energy Conserve See “Energy Conserve” on page 3-27. 
Auto Align Adj See “Auto Align Adj” on page 3-28. 
Auto Color Adj See “Auto Color Adj” on page 3-28. 
Color Adj State See “Color Adj State” on page 3-28.
Enforce Color Order See “Enforce Color Order” on page 3-28. 
Color Alignment See “Color Alignment” on page 3-28. 
Motor Calibration See “Motor Calibration” on page 3-29. 
Paper Prompts See “Paper Prompts” on page 3-29. 
Env Prompts See “Env Prompts” on page 3-29. 
Action for Prompts See “Action for Prompts” on page 3-29. 
Jobs on Disk (if hard disk is installed) See “Jobs on Disk” on page 3-29. 
Disk Encryption (if hard disk is 
installed)See “Disk Encryption” on page 3-30. 
Wipe Disk (if hard disk is installed) See “Wipe Disk” on page 3-30.
Duplex Gloss See “Duplex Gloss” on page 3-30. 
Font Sharpening See “Font Sharpening” on page 3-30.
Clear Custom Status See “Clear Custom Status” on page 3-31.
Exit Config Menu This selection exits Configuration Menu, and Resetting the Printer 
displays. The printer performs a POR and returns to normal mode.