Agilent Technologies 89410A Service Manual page 44

Troubleshooting the Analyzer
To troubleshoot display failures
d
Set the power switch to on ( l ).
e
Check the following display signals using a voltmeter.
Test Location
A90 P10 pin 7
A90 P10 pin 15
A90 P10 pin 17
A90 P10 pin 19
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.
Symptom
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.
Screen is blank.
Screen is tilted, compressed, or distorted.
Line across the screen.
† Before replacing the A100 Display assembly, go to
do Step 7 to check the +65 V power supply voltage.
1-26
Signal Name
490 mVdc
R
G
B
page 1-15''To troubleshoot the power supply,'' and
Amplitude (±10%)
INTEN
25 to 45 mVdc
25 to 45 mVdc
25 to 45 mVdc
Probable Faulty Assembly
A47 DSP/Display Controller
A100 Display †