Pc Board - Respironics BiPAP Vision Service Manual

Chapter 3
Theory of Operation

3.3 PC Board

DC PWR
feed*
J1
J1
DC PWR
interconnect
J15
DC PWR
feed**
ICB
J2
PAL
ICB
J3*
* Applies to units built s/n 106000 and above
** Applies to units built s/n 105999 and below
3-12
The PC board functions through a microcontroller to:
• Communicate with the MC board
• Communicate to a service laptop computer for diagnostics
• Acquire sensor data through an analog-to-digital converter (ADC)
• Control valves and the blower motor through a digital-to-analog
converter (DAC)
• Respond to or invoke an error signal
DC power
conversion
MC PWR
feed
J11
Microprocessor
DC PWR
junction
RAM ROM
Chip select
ELC
RS-232
interface*
pressure control board
NOTE: The
When referring specifically to
(built s/n 105999 and below), it is called the
subsystem (PAS) board.
BiPAP Vision Service Manual © Respironics, Inc.
DAC
ADC
EEPROM
Figure 3-5: PC Board Block Diagram
is generally abbreviated as the PC board.
older boards in non-upgraded units
J5
Blower
driver
J7
PRV
Valve
drivers
J8
ILFR
J4
AFM
J6
OM
PC sensors
MT1 MT2
MT3**
J12
Fan
current
sense
pressure airway
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