4
Perform the
RAM
test.
a
Press the
RAM
softkey.
b
Does the display message say
Test Passed
?
If yes, press any key to continue. If not, (the display message says
Test Failed
) replace the system board.
5
Perform the display test.
a
Press
Print/Utility
.
b
Press the
Self Tst
softkey, then press the
Display
softkey.
c
Do the half bright and full bright squares appear?
If yes, continue with the steps below. If not, replace the display.
d
Press any key to continue.
e
Do squares appear in the four corners?
If yes, the display is good. If not, replace the display.
f
Press any key to end the test.
g
If you still have the failing symptom, replace the system board.
Service
Troubleshooting the Oscilloscope
4–47
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