Theory of operation
Puritan Bennett™ 700 Series Ventilator System Service Manual
10070389 Rev. A
2-59
2.3.8 Miscellaneous electronic parts
2.3.8.1 Speaker
The speaker provides a multi-frequency alarm. (See Figure 2-45 for speaker and Figure 2-47
for installation in ventilator). The speaker volume, which has five settings, is software-
controlled through the MENU key.
Figure 2-45. Speaker
2.3.8.2 Piezo alarm
The piezo alarm serves as a backup for the speaker. (See Figure 2-46 for piezo alarm and
Figure 2-47 for installation in ventilator.) It can sound for two or more minutes. The alarm
sounds under these conditions: following a total loss of power (in certain circumstances);
when the ongoing tests detect a main alarm failure; and during part of POST, SST, and EST.
NOTE:
If the ventilator does not have a battery or the battery is inadequately charged, the
piezo alarm will sound when the ventilator is powered off. The ventilator interprets
this powering down as an unintentional total loss of power.
Figure 2-46. Piezo alarm
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Summary of Contents for Puritan Bennett 700 Series
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