Pressure Control (Pc) Board - Respironics BiPAP Vision Service Manual

Chapter 5
Component Removal/Installation
5.19 Pressure Control
(PC) Board
5-28
Follow these steps to remove the PC board (Figure 5-27). Reverse to install.
1. Remove the blower (section 5.12).
2. Remove the screw that attaches the cable retainer to the PC standoff.
Note that this step does not apply to older boards (called PAS boards)
in non-upgraded units (built s/n 105999 and below).
3. Remove the aluminum standoff from the PC board. Note that this step
does not apply to older boards (called PAS boards) in non-upgraded
units.
4. Remove these cables from the PC board:
• PSS-PC cable (PC J1-PSS J2).
• ICB cable (PC J2-DC J14).
• OM ribbon cable (PC J6-OM).
• Blower harness (PC J5-blower).
• AFM ribbon cable (PC J4-AFM).
• PRV cable (PC J7-PRV).
• ILFR cable (PC J8-ILFR).
• PSS voltage monitoring cable (PC J12-PSS J8)
NOTE: Although the OM and AFM ribbon cables are interchangeable, they
are designed so that the shorter cable connects to the AFM and
longer cable connects to the OM.
5. Remove the pressure tubing from pressure transducers MT1 and MT3.
To reinstall pressure tubing:
• Connect front panel proximal pressure port tubing to MT1 (port
closest to OM/AFM).
• Connect AFM tubing to MT3 (if transducer has two ports, connect
tubing to port closest to "MT3" on PC board).
CAUTION:To avoid damaging pressure transducers, avoid using excessive
pressure to remove tubing. Carefully twist the tubing slightly to break
the seal, the continue to rotate the tubing as you lift it away from the
transducer.
6. Release the tabs on the 7 nylon standoffs that retain the PC board.
7. Lift the PC board away from the bottom enclosure.
BiPAP Vision Service Manual © Respironics, Inc. 1062788