Replacing The Logic Board - Agilent Technologies 7820A Service Manual

216
Agilent 7820 GC Service

Replacing the logic board

The logic board contains information specific to the GC and its
configuration, including methods, sequences, serial number, date
of manufacture, the Gateway, Subnet Mask, and IP address of
the LAN, logs, oven type, heater configuration(s), detector frit
data, and so forth. These items must be reentered after the new
logic board is installed.
If the GC is functional, use the keypad to view and record the
following information:

Configuration-required

Oven Type

Gas types

Heater assignments: valve box, others

Valve types

If the configuration includes non-Agilent components or
specials, you may need to re-enter custom heater or
pneumatic PIDs. View and record this information.

Make sure you have the correct frit data on hand. Download
the latest from the Agilent web site, and make sure you have
Instrument Utility B.01.06 (or greater) on hand to upload the
frit data values to the new main board. Obtain the detector
serial numbers from the detector bodies (lift the detector top
cover and look on each detector chassis).
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.