Lexmark C760 Service Manual

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DRAM Test
This test checks the validity of DRAM, both standard and optional. 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.Select DRAM Test  from HARDWARE TESTS in the Diagnostics mode.
The power indicator  blinks indicating the test is in progress.
2.Press  Return  or Stop  to exit the test.
P:###### represents the number of times the memory test has passed and finished successfully....

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ROM Test
The ROM memory test is used to check the validity of the controller board code and fonts.
To run the ROM Test:
1.Select ROM Test  from HARDWARE TESTS in the Diagnostics mode. 
P and F represent the same numbers for DRAM. The power indicator  blinks indicating the test is in 
progress. The test runs continuously.
2.Press  Return  or Stop  to exit the test.
Each time the test finishes, the screen updates with the result. If the test passes, the Pass Count increases...

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Serial Wrap Test
Use this test to check the operation of the Serial Port Hardware using a wrap plug. Each signal is tested.
To run the Serial Wrap Test:
1.Disconnect the serial interface cable and install the wrap plug.
2.Select the appropriate  Serial Wrap Test from HARDWARE TESTS in the Diagnostics mode. Values 
include  Serial Wrap , Serial 1 Wrap , Serial 2 Wrap,  or Serial 3 Wrap . P and F represent the same 
numbers for DRAM.
The power indicator  blinks indicating...

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DUPLEX TESTS
Duplex Quick Test
This test verifies if the Duplex Option Top Margin is set correctly. This test prints a duplexed version of the Quick 
Test Page that can be used to adjust the Top Margin for the back of the duplexed page. You can run one 
duplexed page (Single) or continue printing duplexed pages ( Continuous) until Return  or Stop  is pressed.
You must use either Letter or A4 paper.
To run the Duplex Quick Test:
1.Select  Duplex Quick Test  from DUPLEX...

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INPUT TRAY TESTS
Feed Test
This test lets you observe the paper path as media is feeding through the printer. The upper front door, used to 
access the print cartridge, cannot be opened during the feed test. To observe the paper path, you must open the 
lower front door, used to access the paper jams on the vacuum transport belt. Blank pages feed during the test.
Note:  This test can run using any of the paper or envelope sizes supported by the printer. The pages are...

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For 2000-sheet trays
This test can also be used to determine if the 2000-sheet tray sensors are working correctly.
1.Select  Sensor Test  from INPUT TRAY TESTS in the Diagnostics mode. for the tray you want to test.
The following is displayed:
The selected tray is displayed on line 1 < input tray> is either  Tr a y  2, Tr a y  3 , or Tr a y  4 .
2.Manually actuate each tray sensor by moving the flag in and out of the sensor. OP (Open) appears when 
the flag is out of the...

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Sensor Test
This test verifies if the output bin sensors are working correctly.
The following output sources, if installed, are supported by this test.
Standard Bin
Output Expander
5-Bin Mailbox
To run the Output Bin Sensor Test:
1.Select  Sensor Test  from OUTPUT BIN TESTS in the Diagnostics mode.
2.Select the bin you want to test.
If Standard Bin  is selected the following is displayed.
If Output Expander  is selected the following is displayed:
If 5-Bin Mailbox  is...

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FINISHER TESTS
Staple Test
This test verifies the operation of the staple mechanism in the finisher.
To run the Staple Test:
Select Staple Test  from FINISHER TESTS in the Diagnostics menu. The printer feeds eight pieces of media to 
the finisher and accumulates all eight pieces in the accumulator. After the last sheet is accumulated, the pack is 
stapled.
When the test is complete, the printer returns to the original screen.
Finisher Feed Test
This test verifies that...

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If you select  Media 2 from the menu the following is displayed and the sensors polled:
Once the sensors are polled the following is displayed and the sensors are ready to test.
Once the screen is displayed you can manually actuate each of the sensors. When the sensor is 
closed,  CL is displayed, when the sensor is open  OP is displayed.
If you select  Media 3 from the menu the following is displayed and the sensors polled:
Once the sensors are polled the following is...

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BASE SENSOR TEST
Use the Base Sensor Test to determine that the sensors located inside the printer are operating correctly. The 
following sensors can be checked using this test:
Input S1
Input S2
In-Line Media 
Fuser exit sensor
K TMC sensor (black)
C TMC sensor (cyan)
M TMC sensor (magenta)
Y TMC sensor (yellow)
See  “Printer sensors” on page 5-3  for locations for these sensors. See  “Cartridge contact assembly pin 
locations (cyan, magenta and yellow)” on page 5-4  or...