Mainframe Overview; Covers And Fans; Removing And Replacing The Covers - Agilent Technologies 7820A Service Manual

Mainframe overview

Covers and Fans

194
Agilent 7820 GC Service
The GC mainframe consists of the chassis (baseplate) plus the
following:

A set of metal and plastic covers

The oven, oven door, and related parts

Electronic components inside the right side cover. These are
the "mind" of the GC.

Power handling components inside the lower back cover

Wiring cables and harnesses
Inlets, detectors, valves, and other selected components are
mounted on or in the mainframe.
Metal and plastic covers protect the GC components and guard
the user from exposure to heat and electric shock. The covers
also play a part in controlling the flow of cooling air through the
instrument. The GC should not be operated unless all covers are
in place.
Additional cooling is needed in two areas, the inlets and the EPC
pneumatic controllers. The inlet fan is located at the rear of the
inlet cover. The preumatics fan is located on the back of the GC
under the center of the pneumatics slots.

Removing and replacing the covers

Detector top cover
This cover protects the detectors, valve box, and valve
assembly. To remove it, raise it to a vertical position, lift the right
side, and disengage the pin on the lower left side.
Do not force the cover, either when installing it
or closing it. This could break the plastic parts.