Service manual

Running the Dell Diagnostics: Dell Latitude CP
● Coprocessor Calculation Test
Checks the use of different types of numbers and the math coprocessor's ability to
calculate correctly.
● Coprocessor Error Exception Test
Verifies the math coprocessor's ability to handle errors and to send IRQs to the
microprocessor.
● PC Card Controller Test
Checks the functionality of the PC Card controller on the system board.
● USB Register Test
Checks the integrated registers of the USB interface. This subtest does not test USB
peripherals.
● USB Memory Structure Test
Monitors the ability of a USB controller to process a simple set of memory-resident
instructions.
Video Test Group
The subtests in the Video test group verify the proper operation of the video controller and the
video control circuitry installed in the computer. These subtests check for the correct operation
of the readable registers in the video circuitry and the controller. They write, read, and verify
data patterns in the cursor registers of the controller. The Video test group also provides
additional subtests to test the color features of the color display or an external color monitor.
Why Run a Video Test?
Many of the symptoms that would prompt you to run a subtest in the Video test group are
obvious, because the display is the visual component of the computer. Before you run the
Video test group or any of its subtests, you should make sure that the problem is not occurring
in the software or caused by a hardware change.
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