General Maintenance
4. If the Diagnost
ics log reports Audio DSP Self Te st-dsp1 , perform the
following procedure:
a. Check to see if
surround display is functioning correctly by doing the
following.
i. Press and
hold the Audio button.
ii. In the audio menu, select Aux Display>Surround Display.
iii. Press the Audio Input Menu button, then select Audio Input> AES A.
iv. Connect an AES test tone generator to the AES A IN 1, 2 connector.
b. Ifthereisnothingdisplayedonthesurrounddisplay,proceedtostepc;
otherwise, replace the audio board.
c. Probe pins E15 through E22 and pins D16, 17, 18, and C17 on audio
board connector J641, and verify that the signals on all pins are toggling.
If any signals are not toggling, replace the main board.
d. Probe pins C15, C16, and C19 on connector J641 during the boot
sequence, and verify that the signals on the pins toggle. If they do not
toggle, suspect the m ain board.
e. Probe pin B22 on audio board connector J641. If the signal on the pin does
not toggle, replace the audio board; otherwise replace the main board.
f. If all of these steps pass, replace the audio board.
5. If the Power-Up Diagnostics screen reports Audio DSP Self Test - X,where
X is any other number, replace the audio board.
Examine Power-Up
Diagnostics Results in
the Diagnostic Log
To examine the Power-up Diagnostics results, press the CONFIG button, then
select Utilities > View Diagnostic Log.
Each power up is indicated by a boot time stamp, followed by a list of power on
tests. If any failures are indicted then refer to the action as noted above.
Run Advanced Diagnostics
To run the Advanced diagnostics, press the CONFIG button, then select Utilities
> RunAdvancedDiags.
A series of tests will be run; the exact tests will depend on which options are
present in the instrument. There are four distinct parts to the advanced diagnostic
results screen: a top section which shows Frequencies and Versions, a middle
section of Pass/Fail tests, a lower section which shows SDI and Video bus activity,
and, finally, narrow YRGB ramps at the very top and bottom to look for missing
bits on the display interconnect.
WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual 4–19
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