Digital Clock, Timer, Chronometer Operation; Timer Operation; Display Test - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
10-103. DIGITAL CLOCK, TIMER, CHRONOMETER OPERATION (Refer to Figure 10-11). The
face of the digital clock contains a digital display, set/reset button, mode button and date/advance, start/stop
button. The digital display indicates either the time in hours and minutes, the date in month and day or the
timer which counts minutes and seconds for the first hour, then hours and minutes to 24 hours. The desired
display is selected by pressing the mode button and the mode is then indicated by a decimal point annunciator
in either the TIMER or CLOCK position.
a.
TIMER operation:
1.
Press the MODE button to position the decimal point annunciator over the TIMER legend
and to place the display in the TIMER mode.
2.
Press the ST/SP button once to begin counting and again to stop the count.
3.
To reset the digital display to zero, press the RST button.
b.
CLOCK operation:
NOTE
The annunciator appears over the CLOCK legend in 12 hour clock
only. When using 24 hour clock, utilize TIMER annunciator to
indicate mode.
1.
Press the MODE button to position the decimal point annunciator over the CLOCK legend
and to place the display in the CLOCK mode.
2.
Press the SET button once. The digital display will indicate the date. Advance to the desired
month by pressing the DT/AV button.
3.
Press the SET button once. Advance to the desired day by pressing the DT/AV button.
4.
Press the SET button twice. Advance to the desired hour by pressing the DT/AV button.
5.
Press the SET button once. Advance to the desired minutes by pressing the DT/AV button.
6.
Press the SET button once. The clock will hold at the time at which it was set.
7.
Press the DT/AV button once to start the clock.
NOTE
To change the hour without changing the minutes, set the hour as
described above then press the SET button twice to continue the
time. If the clock colon is missing or does not blink, press the
DT/ AV button for two seconds until the date returns to the digital
display. Colon activity will resume. To display the date press the
DT/AV button momentarily. The date display will return to clock
display automatically.
c.
Display Test:
1.
Select CLOCK mode.
2.
Hold the SET and DT/AV buttons down together to display all characters.
3.
The display should return to the SET mode.
4.
Press the MODE button twice to get out of the SET mode.
Added: 9/24/81
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INSTRUMENTS
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