(d) Electrical Test.
Immediately following the sequential displays, a series of eight
internal electrical tests occur. During these tests, one-digit
numbers may appear on the display. These are the code numbers related
to the test being made, and you can ignore them.
b. Preoperational Test Procedures.
Set PWR to ON.
Set ALM switch to AUD.
Press and hold CLR/TEST button until alarm sounds
for two seconds; then release.
When segment display appears, check that display is
exactly as shown here and then perform all of Step 5
within ten seconds.
Set ALM switch to OFF. (Alarm sound stops.) Set
ALM switch to VIS. (Rate and dose lights come on.)
Set ALM switch back to AUD. (Lights go out; alarm
sounds.) Set ALM switch to OFF.
At the end of the ten-second segment test, the
digit/unit test begins with three zeros and
continues in the sequence shown in Figure 5-15.
Check each display in the sequence for correctness
During the electrical test that starts immediately
after the 999 Gy display, you may see one-digit
codes on the display, (Figure 5-16). You can ignore
If all tests are OK, after 10 to 60 seconds, a
flashing 9 appears with the pulsating alarm. When
you see the flashing 9, (Figure 5-17), proceed to