Lexmark X 850 Owners Manual

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Sensor Test (output bin)
This test is used to verify that a specific output bin’s sensors are working correctly. 
To run the Output Bin Sensor Test
1.Touch OUTPUT BIN TESTS from the Diagnostics Menu.
2.Touch Sensor Test.
The panel displays each installed bin, one bin per line. When you select an output bin, the panel displays the 
selected output bin in the header row, and then displays the name of each of the bin’s sensors. You must select 
a specific sensor from this list in order to view and toggle the sensor’s state. After selecting a specific sensor, 
[Sensor Name] Testing... the LCD displays the sensor’s name in the header row and, below the header 
row, the sensor’s name and current state. The table below indicates which sensors are available in each output 
bin.
When you selects a specific sensor, the LCD displays the sensor’s current state (Open or Closed). You can 
manipulate the printer in such a way as to actuate the selected sensor. The LCD displays Closed when the 
sensor is closed or Open when the sensor is open. If the wrong message is displayed, then the sensor must be 
malfunctioning. 
Press Stop   to exit the test.
FINISHER TESTS
Staple Test
This test is used to verify the functioning of the finisher’s staple mechanism.
To run the Staple Test
1.Touch FINISHER TESTS from the Diagnostics Menu.
2.Touch Staple Test.
The printer feeds eight pieces of media from the default input source to the output bin that supports stapling. 
After all eight pieces of media are deposited, the device staples the packet. While this test runs, Staple Test 
Running... appears on the LCD. 
Press Stop   to cancel the test. Output BinStd bin full 
exit1Std bin full 
exit2Fin upper bin 
fullStacker bin 
level1Stacker bin 
level2
Standard Bin
Output Bin 1
Output Bin 2  
						

							3-14MFP Service Manual 7500-XXX
Hole Punch Test
This test is used to verify that media can be fed to a finisher output bin and then hole punched. No information is 
printed on the feed test pages. 
To run the Hole Punch Test:
1.Touch FINISHER TESTS from the Diagnostics Menu.
2.Touch Hole Punch Test.
Eight sheets of paper are fed, and then the pages are hole-punched with a 2-hole or 3-hole pattern depending 
on the selected punch test. Media is initially requested from the default input source and then output to the 
Finisher output bin.
The Hole Punch Test cannot be canceled. No buttons are active during this test. During the test, Hole Punch 
Test Running... appears on the LCD. After completion of the test, the display returns to the Hole Punch 
Test screen.
Feed Tests (Finisher)
This test is used to verify that media can be fed to a finisher output bin. This test feeds one sheet of media from 
the printer’s default input source to a finisher output bin. The device can perform this test using any paper size 
that is supported by the finisher. No information is printed on the test page.
To run the Feed Test:
1.Touch FINISHER TESTS from the Diagnostics Menu.
2.Touch Feed Tests.
You cannot specify the output bin to which the device will feed the test page. Once begun, the Feed Test cannot 
be canceled. No buttons are active during the test. During this test, Feed Test Running... appears on the 
LCD.
Sensor Test (Finisher)
This test verifies that the sensors in the finisher are operating properly. 
To run the Feed Test:
1.Touch FINISHER TESTS from the Diagnostics Menu.
2.Touch Sensor Test.
The LCD displays the option’s name in the header row and each of the option’s sensors below the header row. 
You must select a specific sensor from this list in order to view and toggle the sensor’s state. After selecting a 
specific sensor, [Sensor Name] Testing... appears on the LCD with the sensor’s current state below this 
message. The tables below indicate which sensors are available for testing.
Available Cover and Door Sensors
 Sensor Name Description
Cover F bridge top Sensor (bridge unit top cover interlock)
Door G finisher front Switch (finisher front door interlock) 
Surface H finisher eject Switch (eject cover interlock) 
						

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Available Bin Level Sensors
Available Media Path 1 Sensors
Available Media Path 2 Sensors
Available Punch and Staple Sensors Sensor Name Description
Fin upper bin full Sensor (upper media bin full)
Stacker bin level1 Sensor (stacker bin level 1)
Stacker bin level2 Sensor (stacker bin level 2)
Stacker bin upper limit Sensor (stacker bin upper limit)
Stacker bin no media Sensor (stacker bin no media)
Stacker bin level encod Sensor (stacker bin level encoder)
 Sensor Name Description
Bridge media entrance Sensor (bridge media entrance)
Bridge media exit Sensor (bridge unit exit)
Finisher media enter Sensor (finisher media enter)
Buffer path Sensor (buffer path)
Upper media exit Sensor (upper media exit)
Lower media exit Sensor (lower media exit)
Compiler media in Sensor (complier media in)
 Sensor Name Description
Diverter gate Sensor (diverter gate)
Front tamper hp Sensor (front tamper HP)
Rear tamper hp Sensor (rear tamper HP)
Eject clamp hp Sensor (media eject clamp HP)
Media eject shaft hp Sensor (media eject shaft HP)
Sensor Name Description
Punch side reg1 Sensor (punch unit side reg 1)
Punch side reg2 Sensor (punch unit side reg 2)
Punch box set Sensor (punch waste box set)
Punch waste full Sensor (punch waste box full)
Low staple Sensor (low staple)
Punch carriage shift hp Sensor (punch carriage shift HP)
Punch unit hp Sensor (punch unit HP)
Stapler carriage shift hp Sensor (stapler carriage HP)
Punch cam front Sensor (punch unit cam front)
Punch hole select Sensor (punch hole select) 
						

							3-16MFP Service Manual 7500-XXX
After selecting one of the available sensors, you can manually toggle the sensor between its two values (Open 
or Closed). The LCD displays Open when the sensor is open, and Closed when the sensor is closed.
Press Stop   to exit the test.
BASE SENSOR TEST
This test verifies that the sensors in the base machine are operating properly. 
To run the Base Sensor Test:
Touch BASE SENSOR TEST from the Diagnostics Menu. The panel displays BASE SENSOR TEST in the 
header row and the following categories of sensors below the header row:
•Cover and Door 
•Devices 
•Exit Level 
•Media Path 
After you select a category of sensors, the panel displays the name of the selected category in the header row 
and each sensor in that category. You must select a specific sensor from this list to view and toggle the sensor’s 
state. After you select a specific sensor, [Sensor Name] Testing... appears on the LCD and displays the 
sensor’s name in the header row and the sensor’s name and current state appears below the header row.
Cover and Door Sensors
Device Present Functions
Exit Level Sensors Sensor Name Description
Door A printer left Switch (printer left door interlock)
Door B printer left/lower Switch (left lower door interlock)
Door C 2TM/TTM left Switch (2TM/TTM left door interlock)
Door D duplex left Switch (duplex left door interlock)
Door E exit 2 left Switch (exit 2 left door interlock)
Door J front Switch (printer front door interlock)
Door K HCF top Switch (HCF top door interlock)
 Sensor Name Description
PC unit present Indicates the PC cartridge is installed
Exit2 present Indicates the exit 2 unit assembly is installed
 Sensor Name Description
Std bin full exit 1 Sensor (std bin full exit 1)
Std bin full exit 2 Sensor (std bin full exit 2) 
						

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Media Path Sensors
To test any of the displayed sensors, you must manipulate the appropriate area of the printer so the sensor’s 
value will toggle.
If the panel inaccurately displays the sensor’s status, then the sensor must be malfunctioning.
Press Stop   to cancel the test. Base Sensor Test Canceled appears on the LCD.
DEVICE TESTS
Quick Disk Test
This test will perform a non-destructive read/write on one block per track on the disk.
To run the Quick Disk Test:
1.Touch DEVICE TESTS from the Diagnostics Menu.
2.Touch Quick Disk Test.
Quick Disk Test Testing... appears on the LCD. This test cannot be canceled. After the test finishes, 
either Quick Disk Test Passed or Quick Disk Test Failed appears on the LCD. This message 
remains until you touch Back.
Disk Test/Clean
This test performs a low-level format of the hard disk.
Warning:  This test destroys all data on the disk and should never be performed on a good disk. Use this test 
only when the disk contains bad data and is unusable. When this test completes, the disk automatically 
initializes with a new file system; therefore it is unnecessary to format the disk. 
To run the Disk Test/Clean Test:
1.Touch DEVICE TESTS from the Diagnostics Menu.
2.Touch Disk Test/Clean Test.
Contents will be lost. Continue? appears on the LCD. To exit this test and return to DEVICE TESTS, 
touch No. This is your only chance to exit this test; once the test has begun, it cannot be stopped.  Sensor Name Description
Registration Sensor (registration)
Fuser exit Sensor (fuser exit)
Exit1 shift hp Sensor (exit 1 media shift HP)
Exit2 Sensor (exit 2)
Exit2 shift hp Sensor (exit 2 media shift HP) 
						

							3-18MFP Service Manual 7500-XXX
While this test runs, the following graphic appears: 
This test cannot be interrupted once it has begun. After the test finishes, either Disk Test/Clean Test 
Passed or Disk Test/Clean Test Failed appears on the LCD. Press Stop   to clear the final message 
and return to DEVICE TESTS.
Formatting Disk
1/1 0%
DO NOT
POWER OFF 
						

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PRINTER SETUP
To enter the PRINTER SETUP screen, touch PRINTER SETUP from the Diagnostics Menu. The following 
graphic appears on the LCD:
Defaults
The value of this setting determines whether the printer uses the US or Non-US factory default value for the 
printer settings listed below:
Touch Submit to change the value of this setting, then the LCD returns to the Diagnostics menu. To return to 
the PRINTER SETUP menu without changing the value of this setting, touch Back.  Printer Setting US Value Non-US Value
Paper Sizes
(applies only to input sources which do not have hardware size 
sensing capability)Letter A4
Envelope Size
(applies only to envelope feeding sources which do not have 
hardware size sensing capability)10 Envelope DL Envelope
PCL Symbol Set PC-8 PC-850
PPDS Code Page 437 850
Universal Units of Measure Inches Millimeters
?BackSubmit
PRINTER SETUP
Defaults
Serial Number
Envelope Entrance
Engine Setting 1
NV26T470
0 MediumU.S.
Printed Page Count
Perm Page Count24
0 
						

							3-20MFP Service Manual 7500-XXX
Printed Page Count
The value of this setting enables you to gauge the amount of usage on a device. 
The Printed Page Count cannot be reset by the servicer.
Permanent Page Count
The value of this setting indicates the total number of pages that have been printed by the printer. 
The Permanent Page Count cannot be reset.
Serial Number
This printer setting records the printer’s serial number that was assigned by the manufacturer. When you select 
this setting, a replica of a keyboard appears on the LCD that enables you to edit the serial number.
Engine Setting 1 to 4
These settings are used by Engine code ECs to fix field problems.
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 manufacturer, however you 
may need to reset Configuration ID 1 or Configuration ID 2 when you replace the printer engine card assembly. 
This printer uses two Configuration IDs, each of which consists of eight digits. The first seven digits in each ID 
are hexadecimal numbers while the last digit is a checksum of the preceding seven hexadecimal digits. Each ID 
can contain a combination of the digits 0 through 9 and the characters A to F.
If the printer’s firmware detects that either of the printer’s Configuration IDs has not been defined or is invalid, 
then the following occurs: 
1.The firmware automatically uses the Configuration IDs defined for the printer’s standard model.
2.The Configuration ID setting is the only item that appears when you open the Diagnostics menu.
3.When the printer is not in Diagnostics mode, Check Config ID appears on the LCD. 
Note:  Each of the above conditions will remain until a valid value is entered for Configuration ID 1 and 
Configuration ID 2. 
						

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The Configuration ID setting allows you to set both Configuration IDs simultaneously. To set one or both 
Configuration IDs:
1.From the PRINTER SETUP menu, touch the icon to the right of the Configuration ID menu item. The 
screen displays the value of both Configuration IDs. By default, the cursor appears on the Configuration 
ID 1 line.
2.To change the value of Configuration ID 1, touch the Backspace key to erase any of the existing 
characters. Then enter the correct ID using the number and letter keys that appear on the screen. 
3.To edit the value of Configuration ID 2, touch a section of the display screen that appears inside of the text 
box containing the current value of Configuration ID 2. The cursor appears in the text box containing the 
current value of Configuration ID 2. 
4.To change the value of Configuration ID 2, touch the Backspace key to erase any of the existing 
characters. Then enter the correct ID using the number and letter keys that appear on the screen. 
Note:  To exit the Configuration ID screen and return to the PRINTER SETUP menu, touch Back. 
Note:  Although it is recommended that all unused and reserved bits be set to zero, the code will not validate or 
enforce this condition. 
5.To save the values of both Configuration IDs, touch Submit. The printer validates both IDs. If either ID is 
invalid, the printer posts Invalid ID, discards any changes, and displays the original Configuration IDs. 
If both IDs are valid, the printer automatically returns to the PRINTER SETUP menu. 
Edge to Edge
When this setting is On, the text and graphics are shifted to the physical edges of the paper for all margins. 
When this setting is Off, the normal margins are restored.
vga
?BackSubmit
CC 00 01 81
B0 55 70 0C Config ID1
Config ID2
1
2
3
45
6
789
0ab
cd
ef 
						

							3-22MFP Service Manual 7500-XXX
Parallel Strobe Adjustment (Par S Strobe Adj)
This setting enables you to adjust the amount of time the strobe is sampled in order to determine if valid data is 
available on the parallel port. Each time this value is incremented by 1, the strobe is sampled 50 ns longer. Each 
time this value is decreased by 1, the strobe is sampled 50 ns less. When the value of this setting is 0, the 
factory default value is used to determine the length of time the strobe is sampled.
If you increases the value of this setting from 0 to 3, then the strobe will be sampled for 150 ns more than the 
factory default value. Or, if you reduced the value of this setting from 0 to -1, then the strobe will be sampled for 
50 ns less than the factory default value.
EVENT LOG
The exact number of events recorded in the Event Log will vary since each event requires a different amount of 
storage space. When the Event Log requires more space to record an event, it overwrites the oldest currently 
logged event(s) and inserts the new event into the first log position. Consecutive log entries may be identical if 
the same event occurred twice in a row.
The Event Log records the following types of events:
•All 9xx Service Errors
•2xx Paper Jams 
•Maintenance Count Resets
•NV Resets
•JFFS2 Partition Format (Security Files)
•JFFS2 Partition Format (BookmarkMgrData) 
Touch EVENT LOG from the Diagnostics Menu, and the following options are displayed:
Display Log 
Print Log 
Clear Log 
Display the Event Log
Note:  The displayed version of the Event Log shows only a subset of the information contained in the 
Diagnostics version of the printed Event Log. For the most comprehensive information about each logged event, 
print the Event Log. See “Print the Event Log” on page 3-24.