The method in which each half digit of the display is
coded to represent a functional section condition is by
deleting a segment of the digit for a “good” or “bad” in-
dication, or by displaying all segments if a section is not
used. This is shown in Figure 4-5.
As a result of the coding, the four digits in the display
can be one of the characters shown in Figure 4-6 (an ex-
ception is shown in Table 4-6).
Table 4-6 shows all of the possible characters that could
appear in each digit of the 4-digit Main Panel Display.
Any combination of these characters could make up the
Self Test Result. Table 4-6 also indicates, within each
half character, the functional section number and its con-
dition that caused the half character. The examples be-
low show possible self test results and the meaning of
each.
BAD
GOOD
NOT
USED
Figure 4-5. Coding of Display Results for Self Test Result
Figure 4-6. Characters Displayed in Self Test Result
Function of
Controls
Self Test Routine
4-27
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