Specifications

Reading Self-Test Results
You can read system self-test results in the following ways:
By interpreting the display on the monitor.
By interpreting the diagnostic indicator lights on the back
of the system unit. Use these lights when there is no
display on the monitor.
Interpreting Error Messages Displayed on the Screen
For every error the system detects when the monitor is working,
an error message appears on the screen.
The first line of the message tells you where the error occurred.
This line looks something like the following:
?TFL 7/dz/alrm (bad interrupt) [KN02-AA]
The question mark and the three letters that follow the
question mark show that this is an error message.
If any letters other than TFL appear in this location, call
your system manager or your Digital service representative.
The first number that follows ?TFL is the slot number of the
module that reported the error. In the sample message, the
failure is in slot 7, the system module.
The characters that follow the first backslash are the error
code for the individual test that failed.
The characters after the second backslash are the error
code that indicates which part of the test failed.
The characters in parentheses give additional information
about the error.
The last section of the error message shows the module
identification number.
Tables 9-1 through 9-8 list error messages you might see and
tell you what they mean and how to use them to find out where
the problem is. Follow the troubleshooting instructions in
Table 9-1 before you turn to any of the others.
9–4 Troubleshooting