220
Agilent 7820 GC Service
Replacing the analog and power board
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.
Remove the right side electronics panel cover.
If present, remove the ALS controller module. See Replacing
the ALS board ( 209).
Remove the logic board. See Replacing the logic board ( 216).
If present, disconnect valve box heater/sensor(s) from the valve
bracket and remove the bracket. See Removing the valve
bracket ( 214).
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