Lexmark 13P0150 - C 750dtn Color Laser Printer, Service Manual

Page: 125 / 262

Diagnostic Aids
3-5
5060-XXX
Hardware Tests
The following Hardware Tests can be selected from this menu:
LCD Test
Button Test
DRAM Memory Test
ROM Memory 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
To run the LCD Test:
1.
Select LCD Test from the Diagnostic menu.
–
The LCD test continually executes the LCD display test.
2.
Press Return/Stop to cancel the test.
Button Test
To run the Button Test:
1.
Select Button Test from the Diagnostic menu.
–
With no buttons pressed, several OP (Open) appear on the display.
2.
Press each button one at a time and a CL (Closed) displays in place of an OP. The
proper operation of each button can be checked.
3.
Press Return/Stop to cancel the test.
SDRAM Memory Test
This test checks the validity of SDRAM, both standard and optional. The test writes
patterns of data to SDRAM to verify that each bit in memory can be set and read
correctly.
To run the SDRAM Memory Test:
1.
Select SDRAM Memory Test from the menu.
–
The power indicator blinks indicating the test is in progress.
2.
Press Return/Stop to exit the test.
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 of time the memory test has failed and finished with errors.
Initially 00000 displays with the maximum fail count being 99,999.