GE Analytical Instruments ©2006 16-8 DLM 14291 Rev. A
• Turn the Main Power Switch to OFF, remove the power cord from the power
entry module and remove the NOA top cover.
• Remove the ozone generator fuse holder from the right-hand side of the NOA,
near the back.
• Remove the fuse from the holder and use an ohm meter to test the resistance
of the fuse. If the fuse is blown then the resistance will be infinite.
• If the fuse is blown, replace it with one of identical type and current rating.
Refer to the System Specification section of this manual for a listing of fuse
types and ratings appropriate for the NOA.
• If the fuse is OK, replace the fuse in the holder, reinstall the fuse holder in the
back panel, replace the top cover, plug-in the power cord, and turn the Main
Power Switch ON.
If the ozone fuse is OK, then the problem may be a clogged restrictor. There are
two restrictors in the ozone flow path, a pre-restrictor before the ozone generator
and a post-restrictor that delivers the ozone to the reaction cell. To test for a
clogged restrictor:
• From the Main Menu, press ENTER to display the Status Screen.
• Note the supply pressure.
• Decrease the pressure to the ozone generator by turning the regulator on the
NOA back panel clockwise (as viewed from the front).
• Check the pressure in the Status Menu, the pressure should drop as the
pressure on the regulator is released.
If the pressure drops, the restrictors are not clogged and the problem is most
likely the ozone generator, the PMT or the electronics. Contact Sievers for
additional instructions on troubleshooting the problem.
Troubleshooting the NOA
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