Accutorr Plus Service Manual 0070-10-0691 1 - 13
Theory of Operation SpO
2
Processor Circuit Boards
The isolated DC/DC converter, T1, supplies the regulated +5DIG as required by the
Masimo
®
MS-3 Pulse Oximetry module. The digital 5V is then utilized to generate the
analog 15V used by the MS-3. The optocouplers (U1 and U2) isolate the signals used for
bidirectional serial communication with the Masimo
®
MS-3 Pulse Oximetry module.
Control signal SpO
2
COMM at J4 will allow the Accutorr Plus software to interrupt the
serial transmission for future options. All data and control lines interfaced to the SpO
2
module are opto-isolated. Power to the SpO
2
module is isolated by a DC/DC converter
with the input coming directly from the CPU/LED module.
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