Agilent Technologies 89410A Service Manual page 47

f
Check for + 65 Vdc on both sides of F1.
g
If the voltage is correct on one side of F1 and incorrect on the
other replace F1.
h
If the voltage is incorrect on both sides of F1, then the A95 Main
Power Supply is probably faulty.
4
Check the programming signals from A81 to A82.
a Using a logic probe verify that TTL logic pulses are present at TP
18 and TP19 within 30 seconds of power up. These test points will
remain high after programming is complete.
b
If the signals are incorrect at TP18 or TP19 the A81 Keyboard
Assembly is probably faulty.
Troubleshooting the Analyzer
To troubleshoot display failures
1-29