Step 6. Determine if the Motherboard, Fan, or Rear Panel assembly is causing the
Power Supply to shut down.
•
Disconnect the fan cable from A99 P90.
•
Set the power switch to on ( l ).
•
If the power supply LED is now on, the A90 Fan assembly is probably
faulty.
•
Set the power switch to off ( O ).
•
Reconnect the fan cable.
•
Remove the rear panel and disconnect the cable from A10 P100.
See ‘’To remove rear panel’’ on page 6-7.
•
Set the power switch to on ( l ).
•
If the power supply LED is now on, the A10 Rear Panel assembly is
probably faulty.
•
If the Fan or Rear Panel assembly is not causing the Power Supply assembly
to shut down, then the A99 Motherboard is probably faulty.
Step 7. Check the Fan assembly.
•
Set the power switch to off ( O ).
•
Remove the A7 CPU assembly.
See ‘’To remove CPU’’ on page 6-11.
•
Disconnect the fan power cable from A99 P90 (red and black cable).
•
Connect 5 Vdc to the fan cable. The fan should be turning slowly.
• Increase the voltage to 10 Vdc. The fan should turn faster as the voltage
increases.
•
If the fan did not respond correctly, the A90 Fan assembly is probably
faulty.
•
If the fan responded correctly, the A10 Rear Panel assembly is probably
faulty.
Troubleshooting the Analyzer Agilent 35670A
To troubleshoot the power supply
4-14
