3.3 TROUBLESHOOTING PROCEDURES
In the event that a problem occurs during the operation of the ADM300, the
following list of symptoms and corrective actions should be observed:
1. Display is blank when unit is turned ON. Install new batteries (see section
2.2.3.1, Battery Installation).
2. Improper or no alarm indications during normal operation. Check and/or reset
alarm points.
3. Display alternates between high and low reading.
Two possible causes: Defective high-range tube or the Beta cover is open and
the low-range tube is responding to Beta radiation in excess of 5 R/h. This is a
normal condition.
Note: The high-range tube is not sensitive to Beta radiation and in the second
condition above, the low-range tube is receiving radiation above its rated value.
When the display alternates between high and low, the operator should close the
Beta shield if it is open. The alternating condition should stop. If it continues,
the high-range tube is defective. In this event, the ADM300 set should be
referred to maintenance.
4. ADM300 fails to recognize external probe. Make sure that ADM300 is turned
OFF before probe was attached. Inspect connectors for foreign material and
make sure cable pins are straight.
If fault remains, try connecting another probe, if available, to the ADM300. If
no fault is observed, return original probe to maintenance. If a fault still exists,
try another probe cable, if available.
The inspections, tests, and corrective actions listed should be performed. If normal
operation cannot be restored, or if the observed malfunction symptom is not on the
list, return for maintenance.
3.4 AP100A MYLAR WINDOW REPLACEMENT
PROCEDURES
When an AP100A is attached to the ADM300, an increase in the displayed rate,
when the protective cover is removed, indicates a probable light leak through the
Mylar window of the AP100A. The larger the light leak, the greater the increase in
counts. A gross leak caused by a tear or large hole in the Mylar window will
sometimes cause the ADM300 to display zero counts. The Mylar window only
needs to be replaced if a light leak is present.
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