Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 321
Other
Electronic failures
Blown fuses (dead instrument)
The GC is a microprocessor-based instrument.
Virtually all functions of the GC are monitored
and controlled by the microprocessor. If the
processor is not operating properly, then the GC
will appear to be dead. The obvious symptom of a
dead GC is no front panel display characters.
There are other more subtle symptoms, including:
• No relays clicking as the GC goes through
the Power On self test
• The oven flap motor will not be positioned
for initial operation
• The inlet cooling fan will not turn on
The GC powers up correctly if the following
conditions are true:
• The +5 VDC power supply is operational and
in specification. This supply is on the main
board.
• Appropriate firmware is installed properly on
the GC main board.
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