226
Agilent 7820 GC Service
Replacing the power transformer
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.
The transformer is very heavy! Make sure you
have a firm grip on the transformer before
removing / replacing it.
Remove the lower rear metal cover on the GC.
Disconnect the cable from the transformer to the AC board.
Also disconnect the ground wire to the GC frame. Finally,
disconnect the cable harness to the Analog and Power Board
and feed the harness and connector back to the rear of the GC.
Feed the two smaller cable connectors through first to maximize
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