Replacing The Entire Npd - Agilent Technologies 7820A Service Manual

Agilent 7820 GC Service
67
Lift up the hinged detector tower cover and remove the Torx T-20
screw and the clamp on the electrical interconnect.
Loosen the three Torx T-10 screws on the lid weldment and
remove the lid.
Remove one Torx T-20 screw from each end of the electrometer.
(You do not need to remove the screw on the top of the
electrometer that holds the cover on.)
Unlock and detach the electrometer's ribbon cable from the
detector's interface board and lift the electrometer from the
detector pallet.
Reassembly is the reverse of these steps.

Replacing the entire NPD

Before physically installing the detector and EPC into GC, power
GC on and update firmware to A.01.12.003 or higher.
The new version detector requires GC FW revision A.01.12.003
or higher. The lower FW revision would potentially result in
wrong EPC frit constants uploaded. Refer to service note 7820A
-35.