Lexmark X 850 Owners Manual

							Diagnostic aids3-3
7500-XXX
Tray 1 feed mtr
Tray 2 feed mtr
Tray 3 feed mtr
Tray 4 feed mtr
Tray 5 feed mtr
MPF pick solenoid
Duplex drv mtr
Diverter solenoid
Exit 2 cooling fan
Tray 1 lift mtr
Tray 2 lift mtr
Tray 3 lift mtr
Tray 4 lift mtr
Tray 5 lift mtr
Exit 1 shift mtr
Exit 2 shift mtr
Exit 2 drive mtr
Scanner Motor Tests 
Feed drv mtr
Exposure lamp
Scanner cooling fan
Reg drv
Scanner drv
Inverter solenoid
Pick roll position mtr
PRINT TESTSSee “PRINT TESTS” on page 3-6.
Tray 1
Tray 2
Tray 3
Tray 4
Tray 5 (if installed)
MP Feeder
Printing Quality Test Pages
See “Print Quality Test Pages” on page 3-6.
HARDWARE TESTS
Panel Test
See “Panel Test” on page 3-7.
Button TestSee “Button Test” on page 3-7.
DRAM TestSee “DRAM Test” on page 3-8.
CACHE TestSee “CACHE Test” on page 3-9.
Parallel Wrap TestSee “Parallel Wrap” on page 3-9.
DUPLEX TESTS
Quick Test See “Quick Test” on page 3-10.
Sensor Test See “Sensor Test (duplex)” on page 3-10.
INPUT TRAY TESTS 
						

							3-4MFP Service Manual 7500-XXX
Feed Tests See “Feed Tests” on page 3-10.
Sensor Test See “Sensor Test (input tray)” on page 3-11.
OUTPUT BIN TESTS
Feed Tests See “Feed Tests (output bins)” on page 3-12.
Feed To All Bins See “Feed To All Bins” on page 3-12.
Sensor Test See “Sensor Test (output bin)” on page 3-13.
FINISHER TESTS
Staple Test See “Staple Test” on page 3-13.
Hole Punch Test See “Hole Punch Test” on page 3-14.
Feed Tests See “Feed Tests (Finisher)” on page 3-14.
Sensor Tests See “Sensor Test (Finisher)” on page 3-14.
BASE SENSOR TESTSSee “BASE SENSOR TEST” on page 3-16.
Cover and Door
Devices
Exit Level
Media Path
DEVISE TESTSSee “DEVICE TESTS” on page 3-17.
Quick Disk Test
Disk Test/Clean
PRINTER SETUP
Defaults See “Defaults” on page 3-19.
Printed Page Count See “Printed Page Count” on page 3-20.
Permanent Page Count See “Permanent Page Count” on page 3-20.
Serial Number See “Serial Number” on page 3-20.
Engine Setting 1 to 4 See “Engine Setting 1 to 4” on page 3-20.
Model Number See “Model Name” on page 3-20.
Configuration ID See “Configuration ID” on page 3-20.
Edge to Edge See “Edge to Edge” on page 3-21.
Parallel Strobe Adjustment “Parallel Strobe Adjustment (Par S Strobe Adj)” on page 3-22.
EVENT LOG
Display Log See “Display the Event Log” on page 3-22.
Print Log See “Print the Event Log” on page 3-24.
Clear Log See “Clear the Event Log” on page 3-24.
SCANNER TESTS
ASIC Test See “ASIC Test” on page 3-25.
Feed Test See “Feed Test” on page 3-25.
Scanner Manual Registration See “Scanner Manual Registration” on page 3-26.
Sensor Tests See “Sensor Test (Scanner Tests)” on page 3-31.
Exit Diagnostics MenuSee “Exiting Diagnostics Menu” on page 3-32. 
						

							Diagnostic aids3-5
7500-XXX
MOTOR TESTS
The tests in this group allow you to test specific motors, and on some motors run them forward or reverse.
To run the MOTOR TESTS:
1.Touch MOTOR TESTS from the Diagnostics Menu.
2.Touch the test to run. 
3.During the test, Motor Running... appears on the LCD.
Note:  If available, Forward and Reverse options appear on the LCD for selected tests.
Press Stop  to stop the test.
The following Finisher Motor Tests are available:
• Sub paddle solenoid • Punch unit mtr
• Media eject clutch • Fin diverter solenoid
• Stapler unit mtr • Fin Buffer solenoid
• Bridge unit drv mtr • Punch carriage shift mtr
• Motor (entrance/paddle) • Front tamper mtr
• Motor (buffer/transport) • Rear tamper mtr
• Motor (exit) • Stapler carriage mtr
• Media eject clamp mtr • Stacker lift mtr
• Media eject mtr
The following Printer Motor Tests are available:
• Transport mtr  • Tray 4 feed mtr
• 2TM/TTM drv mtr • Tray 5 feed mtr
• 2TM/TTM Clutch • MPF pick solenoid
• HCF transport mtr • Duplex drv mtr
• HCF pick solenoid • Diverter solenoid
• MPF/Transport mtr • Exit 2 cooling fan
• Fuser cooling fan • Tray 1 lift mtr
• PC unit cooling fan • Tray 2 lift mtr
• Toner add mtr • Tray 3 lift mtr
• Drum unit • Tray 4 lift mtr
• Registrat clutch • Tray 5 lift mtr
• Tray 1 feed mtr • Exit 1 shift mtr
• Tray 2 feed mtr • Exit 2 shift mtr
• Tray 3 feed mtr • Exit 2 drive mtr
The following Scanner Motor Tests are available: 
• ADF feed drv mtr • Scanner drv mtr
• Exposure lamp • Inverter solenoid
• Scanner cooling fan • Pick roll position mtr
• ADF registration drv mtr • Document set LED 
						

							3-6MFP Service Manual 7500-XXX
PRINT TESTS
To run the Print Tests:
1.Touch PRINT TESTS from the Diagnostics Menu.
2.Touch [Input Source] to verify that the printer can generate output from that source’s media.
3.Touch Printing Quality Test Pages to view information about the printer’s current settings and to test the 
printer’s ability to generate quality output.
4.Touch Single or Continuous. 
•If Single is selected, a single page is printed.
•If Continuous is selected, printing continues until Stop   is pressed to cancel the test.
If a source is selected that contains envelopes, an envelope test pattern is printed. If Continuous is 
selected, the test pattern is printed only on the first envelope.
After a Single test has printed or a Continuous test canceled, the LCD returns to PRINT TESTS. 
Input Source Print Test
Regardless of the input source selected, the printer always generates a simplex version of the Print Test page 
using its default resolution. 
Print Quality Test Pages
This setting enables you to view the values of a broad range of the device’s settings and to test the device’s 
ability to generate acceptable printed output.
The printer automatically generates four pages in English. The device always uses the media that is currently 
installed in Tray 1 to print this report. Once started, printing cannot be canceled and all key presses are ignored 
until printing completes.
If Duplex is activated, this report will be printed on both sides of the paper; otherwise, it will be printed on the 
front sides of the paper only. Input source Appears on the LCD
Tray 1Tray 1 Printing...
Tray 2Tray 2 Printing...
Tray 3 Tray 3 Printing...
Tray 4 Tray 4 Printing...
Tray 5 (if installed)Tray 5 Printing...
MP FeederMP Feeder Printing...
Printing Quality Test PagesPrinting Quality Test Pages... 
						

							Diagnostic aids3-7
7500-XXX
Print Quality Pages Content by Report Page Number
HARDWARE TESTS
Touch the following Hardware Tests from this menu:
•Panel Test
•Button Test
•DRAM Test
•CACHE Test
•Parallel Wrap 
Panel Test
This test automatically toggles all pixels on the LCD through every contrast level beginning with the darkest to 
the brightest. This test shows non-functioning pixels as blank spaces during the darkest contrast. 
This test continues until you press Stop  , then the LCD returns to HARDWARE TESTS.
Button Test
The Button Test is used to verify the operation of each button on the operator panel. 
To perform the Button Test: 
1.Touch HARDWARE TESTS from the Diagnostics Menu. 
2.Touch Button Test. The LCD displays a graphic of the operator panel buttons that matches the layout of 
the operator panel buttons.
3.Press any button on the operator panel and that button on the LCD appears shaded.  Page 
NumberContent
1 General printer information includes: 
• A circular graphic with spokes emanating from a dark center 
• Device Information
•(Envelope Enhance) 
• Engine Setting 1 to 4 
• Edge to Edge 
• Current values of each variable listed
• A repeated string of characters in varying font sizes 
2 Page is gray with two black squares
3 Page is solid black
4 Page is blank (this page verifies that the device does not streak or smear toner) 
						

							3-8MFP Service Manual 7500-XXX
4.Release the button and the shading is removed.
Touch Back to exit the test.
DRAM Test
The DRAM Test is used to check the validity of standard and optional DRAM memory. The test writes patterns of 
data to DRAM to verify that each bit in memory can be set and read correctly.
To run the DRAM Test:
1.Touch HARDWARE TESTS from the Diagnostics Menu.
2.Touch DRAM Test. DRAM Test Testing... appears on the LCD. Then the message Resetting the 
Printer appears and the power LED is green. While the DRAM test executes, the power indicator blinks 
amber. The printer automatically performs a POR. 
The following type of message appears:
•P:###### represents the number of times the memory test has passed and finished successfully. 
Initially 000000 displays with the maximum pass count being 999,999.
•F:##### represents the number of times the memory test has failed and finished with errors. Initially 
0000 displays with the maximum fail count being 99,999. Initially only four digits appear, but 
additional digits appear as needed.
To stop this test before completion, turn the printer off. DRAM Test 256 MB P:###### F:####
vga
?Back
1
23
45
6
78
9
0#
*
,
SG
C 
						

							Diagnostic aids3-9
7500-XXX
CACHE Test
This test is used to verify the printer processor cache.
To run the CACHE Test:
1.Touch HARDWARE TESTS from the Diagnostics Menu.
2.Touch CACHE Test. CACHE Test Testing... appears on the LCD. Then the message Resetting 
the Printer appears. While the CACHE test executes, the power LED is green. The printer 
automatically performs a POR. 
The following type of message appears:
•P:###### represents the number of times the cache has passed and finished successfully. Initially 
000000 displays with the maximum pass count being 999,999.
•F:##### represents the number of times the cache has failed and finished with errors. Initially 0000 
displays with the maximum fail count being 99,999. Initially only four digits appear, but additional 
digits appear as needed.
Each time a test is completed, the number of passes and failures is incremented. If the test fails, the message 
Failure appears for approximately three seconds, and the failure count increases by one.
The test continues until all of the printer processor’s cache has been tested. Once the maximum pass count or 
fail count is reached, the test is stopped, and the final results display.
To stop this test before completion, turn the printer off.
Parallel Wrap
This test verifies the proper functioning of the parallel port hardware using a wrap plug. Each parallel signal is 
tested.
To run the Parallel Wrap tests:
1.Disconnect the parallel interface cable, and install the parallel wrap plug.
2.Touch HARDWARE TESTS from the Diagnostics Menu.
3.Touch Parallel Wrap and the following appears on the LCD.
Each time the printer finishes a test, it increments Pass Count or Fail Count by one according to the success or 
failure of the parallel port hardware. When the maximum number of tests have been executed, the test stops 
and displays the results.
Press Stop   to stop the test. Parallel Wrap Cancelled appears on the LCD, and then returns to the 
HARDWARE TESTS menu.CACHE Test x100 P:###### F:####
Parallel Wrap Testing...
Pass Count: 0
Fail Count: 0 
						

							3-10MFP Service Manual 7500-XXX
DUPLEX TESTS 
Quick Test 
This test prints a duplex version of the Quick Test that can be used to verify that the correct placement of the top 
margin on the back side of a duplex page. You can run one duplexed page (Single), or continue printing 
duplexed pages (Continuous) until is pressed Stop .
Make sure either letter or A4 size paper is loaded in the default paper source. If the default source only supports 
envelopes, then the Quick Test will be printed from Tray 1.
To run the Quick Test:
1.Touch DUPLEX TESTS from the Diagnostics Menu.
2.Touch Quick Test.
3.Touch Single or Continuous. Quick Test Printing... appears on the LCD.
•The single Duplex Quick test cannot be canceled.
•The printer attempts to print the Quick Test Page from the default paper source. If the default paper 
source only supports envelopes, then the page is printed from Tray 1.
•Check the Quick Test Page for the correct registration 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 .
Sensor Test (duplex)
This test is used to determine whether or not the duplex sensors and switches are working correctly. The test 
allows you to actuate the duplex input sensor located in the back part of the duplex unit and the duplex exit 
sensor located in the return paper path.
1.Touch DUPLEX TESTS from the Diagnostics Menu.
2.Touch Sensor Test.
3.Touch Duplex wait. Duplex wait Testing... appears on the LCD.
4.Manually actuate each of the duplex wait sensors. When the sensor is closed, Closed displays; when the 
sensor is open, Open displays.
Press Stop   to cancel the test.
INPUT TRAY TESTS
Feed Tests 
Use this test to observe the paper path of media as it passes through the printer. To observe the paper path, 
open the upper read door while this test executes. No information is printed on the feed test pages since the 
laser is not engaged during this test.
Note:  The upper front door (used to access the print cartridge) cannot be opened during the feed test. 
You can perform the feed test using media from any installed input source. All pages used during the feed test 
are dropped into the default output bin.  
						

							Diagnostic aids3-11
7500-XXX
To run the Input Tray Tests:
1.Touch INPUT TRAY TESTS from the Diagnostics Menu.
2.Touch the input source.
3.Touch either Single or Continuous. 
•Single–Feeds one sheet of media from the selected source.
•Continuous–Media continues feeding from the selected input source until Stop   is pressed.
Sensor Test (input tray)
This test is used to verify that a specific input tray’s sensors are working correctly. 
To run the Input Tray Sensor Test:
1.Touch INPUT TRAY TESTS from the Diagnostics Menu.
2.Touch Sensor Test.
After selecting Sensor Test, the LCD displays each installed input source, one source per line. When you select 
an input source, the LCD displays the selected input source in the header row, and then displays the name of 
each of the source’s sensors below the header row, one to a line. You must select a specific sensor from this list 
in order to view and toggle the sensor’s state. The table below indicates which sensors are available in each 
input tray.
1Pre-feed Testing... appears on the LCD with the sensor’s current state (Open or Closed).2Feed-out Testing... appears on the LCD with the sensor’s current state (Open or Closed).3Media out Testing... appears on the LCD with the sensor’s current state (Open or Closed).4Media level Testing... appears on the LCD with the sensor’s current state (Open or Closed). Input source Appears on the LCD
Tray 1Tray 1 Feeding...
Tray 2Tray 2 Feeding...
Tray 3 Tray 3 Feeding...
Tray 4 Tray 4 Feeding...
Tray 5 (if installed)Tray 5 Feeding...
MP FeederMP Feeder Feeding...
Input source Sensors
Pre-feed 
1
Feed-out 
2
Media out 
3
Media level
4
HCF unit docking 
5
HCF media tray set 
6
HCF media size L
HCF media size R
Tray 1 Yes No Yes Yes No No No No
Tray 2 Yes Yes Yes Yes No No No No
Tray 3 Yes Yes Yes Yes No No No No
Tray 4 Yes Yes Yes Yes No No No No
T r a y  5 Ye s Ye s Ye s Ye s Ye s Ye s Ye s Ye s  
MP Feeder No No Yes No No No No No 
						

							3-12MFP Service Manual 7500-XXX
5Hcf unit docking Testing... appears on the LCD with the sensor’s current state (Open or Closed).6Hcf media tray set Testing... appears on the LCD with the sensor’s current state (Open or Closed).
After selecting a specific sensor, you can manipulate the printer in such a way as to toggle the sensor between 
its two values (Open or Closed). 
Press Stop   to exit the test.
OUTPUT BIN TESTS
Feed Tests (output bins)
Use these tests to verify that media can be fed to a specific output bin. Media is fed from the default input source 
to the selected output bin. No information is printed on the media fed to the output bin because the printhead is 
not engaged during this test. These tests can use any media size or envelope supported by the printer.
To run the Feed Tests for the output bins:
1.Touch OUTPUT BIN TESTS from the Diagnostics Menu.
2.Touch Feed Tests.
3.Touch the output bin you want the paper to exit into. The standard bin as well as any output option bin 
installed on the printer is shown on the menu. (The output bins are displayed in the order installed on the 
printer.)
•Standard Bin
•Output Bin 1
•Output Bin 2
4.Touch either Single or Continuous.
•Single–Feeds one sheet of media from the selected source.
•Continuous–Media continues feeding from the selected source until Stop   is pressed.
Press Stop  to return to OUTPUT BIN TESTS.
While this test runs, [Selected Output Bin] Feeding...appears on the LCD. During Single tests, no 
buttons are active. However, during Continuous tests, you can press Stop  to cancel the test. If a test is 
canceled, [Selected Output Bin] Canceled appears on the LCD.
Feed To All Bins
This test can be used to verify that the printer can feed media to the standard bin or any installed output options. 
No information will be printed on the test pages, as the printhead is not engaged during the feed test. The media 
feeds from the default paper source.
To run the Feed To All Bins Test:
1.Touch OUTPUT BIN TESTS from the Diagnostics Menu.
2.Touch Feed To All Bins.
The printer feeds media from the default source to each installed bin. After the test is selected, the printer feeds 
a separate piece of media to the standard bin first, then it feeds a separate piece of media to each output bin 
installed. While this test runs, All Bin Test Feeding... appears on the LCD.
The test is continuous until Stop   is pressed. If a test is canceled, All Bin Test Canceled... appears 
on the LCD and feeds any remaining media in the paper path to the appropriate output destination.