uniphy Phyaction 740 Series, Service Information

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Service Information Phyaction 740 & 790-series Page 15
CHAPTER 2
THEORY OF OPERATION
2
.1 Introduction
In this chapter a description of the electronic construction of the Phyaction 790-series is given on the
functional level. Only where safety aspects are concerned we will look into the actual circuitry. The next
paragraph deals with the whole appliance and those blocks that are in use with all therapies. In the
subsequent paragraphs more detailed block diagrams for each kind of therapy will be discussed.
2
.2 General block diagram
Figure 1 shows the functional blocks of the Phyaction 797VIP. The most extensive appliance of the
series. The microcontroller core controlling the entire appliance is featured in the middle. Immediately
below that are the blocks associated with the three therapies and the output panel. At the left there is the
user interface and at the right the serial interface. In the upper part there is the inevitable power supply.
The parallel interface which is only present in the VIP versions is also drawn here.
Figure 1, Functional blocks of the Phyaction 797VIP