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Step 2. Check the CPU signals to the Display assembly.
Set the power switch to on ( l ).
Using a logic probe, check that the following TTL signals are toggling.
Test Location Signal Name In/Out
A7 P2(9) VSYNCEL A7 Out
A7 P2(11) HSYNCELn A7 Out
A7 P2(13) VCLK A7 Out
A7 P2(15) VID A7 Out
If the signals are incorrect, do the following:
Set the power switch to off ( O ).
Disconnect the display cable from A7 P2.
Set the power switch to on ( l ).
Check the signals again.
If the signals are now correct, the A101 Display assembly is probably faulty.
A7 Component Locator, Circuit Side
Agilent 35670A Troubleshooting the Analyzer
To troubleshoot display failures
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