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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.
Released: April 2004
There are other more subtle symptoms, including:
• No relays clicking as the GC goes through
• The oven flap motor will not be positioned
• 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
• Appropriate firmware is installed properly on
6850 Series Gas Chromatograph Service Procedures
the Power On self test
for initial operation
in specification. This supply is on the main
board.
the GC main board.
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