ALS and Detector Symptoms 2
Agilent 7890 Series Troubleshooting 39
Blinking Not Ready Light: Detector Hardware Fault/TCD Filament Voltage
If the TCD filament is open, the Not Ready LED blinks and the
GC will not become Ready.
1 Press [Status]. If the display reads Front detector hardware fault
or (Back or Aux detector hardware fault), the problem may be
the TCD filament.
2 Press [Front Det] (or [Back Det] or [MS/Aux Det]).
3 For GCs with firmware B.02.02 or higher, the display will
read either TCD Open Filament for an open filament, or TCD
Bridge Voltage for a shorted filament.
For GCs with earlier firmware: If the display reads Fault: TCD
Filament Voltage, scroll to the Filament setpoint. If the setpoint
is flashing Off, the problem is an open TCD filament.
4 Power cycle the GC.
5 Press [Front Det] (or [Back Det] or [MS/Aux Det]).
6 Scroll to the Filament and press [Off/No] to disable the TCD
filament. Contact Agilent for service.
To continue to use the GC without the TCD:
1 Turn off all TCD parameters. Save the method.
2 Reconfigure the GC to use another detector. Move the column
and set other parameters as needed.
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