Main Pcb - Respironics ESPRIT Service Manual

Main PCB

REF 580-1000-02 G
Three main PCBs exist in the field: the original main PCB accommodates the
standard alarm, the revised main PCB accommodates the standard alarm, and
the high-volume primary alarm. The third version accommodates the standard
and high-volume primary alarm, has a lithium battery on the board, and the
remote alarm jack is mounted to the top enclosure. Contact technical services
for assistance if there is any question regarding the main PCB version.
Follow these steps to remove the main PCB (Figure 9-55, Figure 9-56, Figure
9-57). Reverse removal steps to install.
NOTE: When reinstalling the main PCB, do not tighten jackscrews on the CN
connectors until all are assembled.
1. Remove the top enclosure (see "Top Enclosure" on page 9-4).
2. Remove all vertically mounted PCBs from the main PCB (section
9.25), and store each PCB in a conductive bag.
3. Remove the backup alarm (section 9.21), but do not disconnect the
red and black wires from the alarm.
4. Hang the alarm assembly over the edge of the bottom enclosure.
5. Remove the outer backup alarm cover and mesh filter.
6. Remove the AC distribution panel (section 9.22).
7. Remove the ten screws that hold these cables, then disconnect by
pulling the connector (not the cable): MAIN CN7, MAIN CN8, MAIN
CN9, MAIN CN10, and MAIN CN21.
8. Remove twelve jackscrews from female connectors on the main PCB.
9. Remove the port covers and six jackscrews that hold the external
connectors to the rear of the enclosure.
10. If necessary, remove the remote alarm jack (see "Remote Alarm Jack"
on page 9-49).
11. Remove the nine screws that hold the main PCB to the tray, then
remove the main PCB.
Remote Parallel
RS-232
port alarm port
Figure 9-55: External Connectors with Port Covers and Jackscrews Removed
Esprit® Ventilator Service Manual © Respironics, Inc.
Component Removal/Installation
PCMCIA
slot
port
Chapter 9
Analog
output port
9-47