Maintenance and Troubleshooting | 6-63
Alarm Type / Alarm Condition Description and Suggested Corrective Action
Warning ALC One or both lamp pulse current-control signals has exceeded 9500 mV. The
Lamp Maximum range is typically 4500–7800 mV. When this alarm occurs,
the analyzer will initiate an Auto-Zero and then an Auto-Setup, to a maximum
of three times.
If the lamps are within range after the Auto-Setup, the counter resets to zero.
If not, the alarm will remain on to indicate there is a problem with the lamps,
which may need replacing.
This alarm may occur during a cold start, but should clear after the source
lamps have stabilized.
Corrective Action:
Take appropriate safety precautions, open the Upper Enclosure, and:
• Check that the lamp sockets are attached securely to the lamps and that
the Lamp Retaining Bracket is in place.
• Check that the lamps are inserted completely into the Lens Block in the
Detector Block Assembly.
• Check the at cables between the Optical Bench board and Optical
Bench for proper connections and inspect them for damage (cuts, nicks,
burn marks, etc.).
• The light levels may be too low as a result of natural aging of the lamps.
This is an indication that the lamps are nearing the end of their useful lives
and should be replaced.
Eventually, a “Fault Lamp Failure” alarms will be activated. Refer to the
description of this alarm for more details.
As a temporary solution, initiate an Auto-Setup to increase the PMT
gain to compensate for the reduced light levels (see “The Auto-Setup
Sequence” in this chapter).
Setup (tab)Optical
Bench
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