Maintenance and Troubleshooting | 6-57
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
1 2 Warning w: ALC out of range
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 Adjustment Plate 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.).
• This condition may also indicate that one or both lamps need to be replaced,
especially if a “w: Excessive zero drift” alarm is also displayed on the Status
tab (in the HC Scode alarm list).
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.
As a temporary solution, initiate an Auto-Setup to increase the ALC Gain to
compensate for the reduced light levels (see “The Auto-Setup Sequence” in
this chapter).
Setup (tab)Optical
Bench
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