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Troubleshooting the Analyzer
To troubleshoot display failures
d Set the power switch to on ( l ).
e Check the following display signals using a voltmeter.
f If any of the signals are incorrect, the A47 DSP/Display Controller
assembly is probably faulty.
2 Determine the probable faulty assembly by comparing the analyzer’s
symptoms to the following table.
† Before replacing the A100 Display assembly, go to page 1-15‘’To troubleshoot the power supply,’’ and
do Step 7 to check the +65 V power supply voltage.
Test Location Signal Name Amplitude (±10%)
A90 P10 pin 7 490 mVdc INTEN
A90 P10 pin 15 R 25 to 45 mVdc
A90 P10 pin 17 G 25 to 45 mVdc
A90 P10 pin 19 B 25 to 45 mVdc
Symptom Probable Faulty Assembly
Vertical and horizontal scanning is occurring.
Part of information is missing, for example only half letters.
Blocks of information are missing.
Information on the screen is scrambled or mixed up.
Vertical or horizontal stripes appear across the screen.
A47 DSP/Display Controller
Screen is blank.
Screen is tilted, compressed, or distorted.
Line across the screen.
A100 Display †
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