Chapter 3
3-6 BiPAP Focus Ventilator Service Manual © Respironics, Inc. REF 1029568 Rev B
Theory of Operation
3.2.2 Controller PCB
The controller PCB (Figure 3-4) includes:
• Blower on/off/closed-loop speed control
• Air flow valve controller
• Pressure measurement
• RS-232 communication
• Inter-processor communication with user interface PCB
• Backup alarm driver
• Flow sensor measurement and calibration
• Real-time clock with battery backup
• Microprocessor watchdog
Figure 3-4: BiPAP Focus Controller PCB
Interprocessor
communications
cable J1
Connects to user
interface PCB (J1)
Backup alarm
cable
Blower
connection J5
Switch control
cable
MT2 -P1 connects to air
flow sensor nipple
(closest to patient outlet)
MT2 -P2 connects to air
flow sensor nipple (away
from patient outlet)
Flow valve assembly J9
Interprocessor
communications
cable J10
Connects to user
interface PCB (J1)
MT3 blower sensor port
MT4 patient
outlet port
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