238
Agilent 7820 GC Service
Figure 7. Installing the valve box top
assembly
Removing the valve box assembly
1 Place the main power switch in the off position.
Hazardous voltages are present in the
instrument when the power cord is connected.
Avoid a potentially dangerous shock hazard by
disconnecting the power cord before working on
the instrument.
Unplug the line power cord from its receptacle.
Allow some time for the oven and heated zones to cool.