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Service
Troubleshooting the Oscilloscope
To run the internal self-tests
Perform the keyboard test.
1
Press
a
Print/Utility
Press the Self Tst softkey, then press the Keyboard softkey.
b
A pictorial diagram of the front panel will appear on the display.
Press each key, and notice that when you press a key a corresponding
c
block on the display fills in.
Rotate the knobs (except the intensity) and notice that an arrow
d
appears on the display that points in the direction you rotate the knob.
Do all the keys and knobs work?
e
If yes, Press the Stop softkey two or three times (the display indicates
how many times), then go to step 2. If not, replace the keyboard and
keyboard assembly.
Check the output level of the
2
Press the DAC softkey.
a
Connect a multimeter to the rear panel
b
The multimeter should read 0 V ±500 µV.
Press any key to continue.
c
The multimeter should read 5 V ±10 mV.
Are the DAC voltages correct?
d
If yes, press any key to continue. If not, replace the system board.
Perform the
test
3
ROM
Press the ROM softkey.
a
Does the display message say Test Passed?
b
If yes, press any key to continue. If not, (the display message says
Test Failed) replace the system board.
4–46
.
.
DAC
DC CALIBRATOR
connector.
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