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Step 2. Check the CPU signals to the Display assembly.
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Set the power switch to on ( l ).
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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
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If the signals are incorrect, do the following:
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Set the power switch to off ( O ).
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Disconnect the display cable from A7 P2.
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Set the power switch to on ( l ).
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Check the signals again.
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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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