Agilent Technologies 35670-90066 manual Set the power switch to off O Remove the A7 CPU assembly

Troubleshooting the Analyzer	Agilent 35670A
To troubleshoot the power supply

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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.

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