78
Agilent 7820 GC Service
Rinse all surfaces of the parts in methanol; inside and outside
surfaces. To insure good rinsing use either a Teflon wash bottle
or a beaker.
From this point on, handle the parts only with forceps (or
tweezers). Remove the jet from the bath and rinse it thoroughly
with hot tap water and then with a small amount of methanol.
Blow the jet dry with a burst of compressed air or nitrogen and
then place the jet on a clean cloth to air dry.
Cleaning the NPD
1 Turn off all gas flows at their sources.
Turn off the GC main power switch.
Components can be damaged by static electricity:
be sure to wear an ESD strap grounded to the GC
chassis while performing this procedure.
Inlets, detectors, and the oven are insulated
with fibrous materials which may cause
irritation to skin, eyes, and/or mucous
membranes. Always wear gloves when working
with the insulation. Additionally, if the
insulation is flaky/crumbly, wear protective
eyewear and a suitable breathing mask and/or
respirator.
Wear lint-free gloves to minimize source
contamination when servicing the bead assembly.
Remove the right side mainframe panel.
Remove the electronics top cover.
Disconnect the power/sensor cable to the NPD.
Disconnect the electrometer cable from the NPD signal board.
(For the old version detector) Unscrew the three thumbscrews
that secure the detector flow tubing to the EPC module.
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