Cocoon CWS 4000 - Troubleshooting; Warming Blanket Will Not Inflate; Standby Indicator Will Not Light; Equipment Repairs

Care Essentials CWS4000 Cocoon Warming System Service Manual
5. TROUBLESHOOTING
5.1. Warming Blanket Will Not Inflate
e Make sure the CWS4000 is plugged in to an energized mains power socket-outlet.
e Check both ends of the delivery hose for proper connection.
e Check the delivery hose and warming blanket inlet for kinks.
e Check that there are no obstructions to the air inlet slots.
e Check the warming blanket for damage. If air is flowing from the hose, try another warming
blanket. Small rips or tears in the warming blanket may be temporarily repaired with
adhesive tape.
e Request qualified service personne! check for a clogged or dirty filter.
e Check for fault alarm.
5.2. Standby Indicator Will Not Light
e Extremely high storage temperatures (such as those found motor cars on hot summer days)
can cause the temperature limit thermostats in the CWS4000 to actuate. Should this occur,
the STANDBY indicator will fail to light when the CWS4000 is connected to mains power. If
this occurs, simply wait for the CWS4000 to cool down and eventually the thermostats will
automatically reset and the STANDBY indicator will light.
e Request qualified service personnel check for blown mains power fuses.
5.3. Equipment Repairs
Repairs to the CWS4000 should be preformed by qualified personnel such as certified
biomedical electronics technicians or clinical engineers familiar with repair practices for
servicing medical devices, and in accordance with the CWS4000 Service Manual. Damage to
the CWS4000 or malfunction may otherwise result.
6. SCHEMATIC DIAGRAM DESCRIPTION
This section describes the CWS4000 schematic diagrams. Reference should be made to the
printed circuit board (PCB) component legend contained in Section 7 and the schematic
diagrams contained in Section 8 below.
The following should assist with the interpretation of the Schematic Diagrams:
e The schematic diagrams are organised in a flat structure.
e Electrical connectivity is shown by continuous wires or net labels on partial wires.
e Netlabels (signal names) are prefixed with a forward slash when they are asserted with
logic “0” (eg: /SIGNAL).
The CWS4000 Control Board implements the following functions:
e Microcontroller.
» RS232 transceiver (Control Board revision E and later).
ο Microcontroller reset circuit.
e Fan control.
e Heater control.
Revision | 13 June 2006 Page 13