Service manual

Chapter 4 Troubleshooting Procedures 4-15
4.6.6 UPA Graphics Card Diagnostic
The ultra port architecture (UPA) graphics card diagnostic contains a built-in
diagnostic test that is enabled through the OBP. The UPA graphics card built-in
diagnostic test verifies basic graphics functionality without booting the operating
system software.
To execute the built-in diagnostic test, the system must be at the ok prompt.
To initialize the UPA graphics card diagnostic:
1. At the ok prompt, type:
TABLE 4-10 Selected OBP On-board Diagnostic Tests
Type of Test Description Preparation
test screen Tests system video graphics hardware and
monitor.
diag-switch? NVRAM parameter must
be true for the test to execute.
test floppy Tests diskette drive response to commands. A formatted diskette must be inserted into
the diskette drive.
test net Performs internal/external loopback test of
the system auto-selected Ethernet interface.
An Ethernet cable must be attached to the
system and to an Ethernet tap or hub or the
external loopback test fails.
test ttya
test ttyb
Outputs an alphanumeric test pattern on
the system serial ports: ttya, serial port A;
ttyb, serial port B.
A terminal must be connected to the port
being tested to observe the output.
test
keyboard
Executes the keyboard self-test. Four keyboard LEDs should flash once and
a message is displayed: Keyboard
Present.
test -all Sequentially tests system-configured
devices containing self-test.
Tests are sequentially executed in device-
tree order (viewed with the show-devs
command).
ok setenv diag-switch? true
diag-switch? = true