Replacing The Fuse On The Als Controller Board - Agilent Technologies 7820A Service Manual

212
Agilent 7820 GC Service
Replacing the fuse on the ALS controller
board
A small fuse on the ALS controller board protects it from
over-currents originating in the ALS components (Injector, for
example), or shorts in their cables. The fuse is associated with
the 42 VAC circuit. You can easily replace this fuse.
1 Cool down the oven.
Turn off the GC main power switch and disconnect its power
cord.
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.
Gather ESD protection, T-10 driver, and tweezer.
Remove the ALS controller board. See Replacing the ALS
board ( 209).
Unscrew the T-10 screw and remove the cover.