ALS and Detector Symptoms 2
Agilent 7890 Series Troubleshooting 27
NPD Fails Leakage Current Test
A failed leakage current test usually indicates misassembly,
contamination, or a damaged part.
If you have just performed maintenance on the NPD, first verify
that the detector was reassembled properly before
troubleshooting detector problems.
1 Replace the ceramic insulators. Restest.
2 Set the bead voltage to 0.0 V. Turn off the adjust offset. View
the output (leakage current).
3 Remove the bead and store in a safe place.
4 Remove the three screws that secure the lid in place, then
remove the lid.
5 Examine the interconnect spring. Make sure that the
interconnect spring is not damaged, bent, or dirty. The
interconnect spring should be touching the bottom of the
collector. If the inteconnect spring is damaged, bent, or dirty,
call Agilent for service.
6 If the interconnect spring is not damaged or dirty, and the
detector output signal is still high, contact Agilent for
service.
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