Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 322
• The internal clocks for timing and synchroni-
zation of data for memory and I/O are func-
tioning. All of these clock circuits are on the
main board.
• There are no shorts on the data or address
busses by which the microprocessor
accesses memory and communicates with I/O
devices connected to the GC main board.
• The GC display board must be functional.
NOTE: Be sure to turn off the GC’s power switch
and disconnect the power cord before checking
fuses and removing or re-installing any cable
connectors or printed circuit board assemblies.
Observe electrostatic discharge precautions
while removing or re-installing printed circuit
board assemblies.
Determining the type of GC
To determine the type of GC you have (standard
or networked), refer to the figures below.
Figure 1-2. Standard (Original) vs.
networked GC back panels
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