Agilent Technologies 7820A Service Manual page 71

Agilent 7820 GC Service
71
Hazardous voltages are present in the
mainframe when the GC power cord is connected.
Avoid a potentially dangerous shock hazard by
disconnecting the power cord before removing
any GC panels.
Components can be damaged by static electricity:
be sure to wear an ESD strap grounded to the GC
chassis while performing this procedure.
Turn off all gas flows at their sources.
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.
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.
Disconnect three electrical connections (to electrometer, to
heater, and the 4-wire communication buss).
Turn thumb screw counterclockwise, lift screw to disengage,
slide board down, and then lift out. (Note that the grounding point
for the board is at the thumbscrew.)
Insert the replacement board.
Reassembly is the reverse of these steps.
Additionally, if the