Remove The Assemblies - Agilent Technologies HP 8719D Service Manual

If the green LEDs are now on, the Al5 prereguiator and A8 post regulator are
working properly and the trouble is excessive loading somewhere after the
motherboard connections at A8. Continue to "Remove the Assemblies"

Remove the Assemblies

1. Switch off the analyzer.
2. Instaii A8. Remove the jumper from A8TP2 (AGND) to chassis ground.
3.
Remove or disconnect aii the assemblies iisted below. (See F'igure 5-5.)
All phase loch
4.
Switch on the analyzer and observe the green LEDs on A8.
If any of the green LEDs are off or fkshing, it is not likely that any of the
q
assemblies listed above are causing the problem. Continue to "Briefly
Disable the Shutdown Circuitry.~
If ali green LEDs are now on, one or more of the above assemblies may
q
be faulty. Continue to next step.
5.
6. Reconnect cable ASPl.
7.
If the LEDs are off or biinking, replace the A19 assembly.
q
If the LEDs are stiii on, continue to next step.
q
8.
Switch off the analyzer.
9. Switch on the anaiyxer and observe the LEDs
If the LEDs are off, replace the Al8 dispiay.
q
If the LEDs are stili on, continue with the next step.
q
10. Switch off the analyzer.