Dräger Evita 4 - Conversions; Replacing CO2 Carrier PCB According to IDM No. 3 (Evita 4)

5664.500/800 Evita 4/Evita 2 dura 06/98 Repair Instructions Page 39
For internal use only. Copyright reserved. GBR5664500T055664800.fm 18.03.99
Dräger Medizintechnik
D
5.5 Conversions
5.5.1 Replacing CO
2
Carrier PCB According to IDM No. 3 (Evita 4)
• Switch unit off.
• Observe electrostatic precautions. Use an ESD protection mat and a wrist strap.
• Dismantle CO
2
Carrier PCB (lowest PCB in the electronics unit).
• Replace resistors R82 and R84 with 511 ohms by 332 ohm resistors (order no.
18 16 144).
If the resistance of R82 and R84 cannot be identified by the serial number, you can
determin the ohmic resistance using a multimeter. It is also possible to determine the
ohmic resistance by the colour code. You have to replace the resistors R82 and R84
with the code “green – brown – brown – black – black” or
“green – brown – brown – black – red”.
• Mark the PCB to be replaced with “IDM 3” on the back.
• Assemble the unit ready for operation.
• Switch unit on and activate CO
2
measurement via “alarm limits” and “monitoring”.
• Carry out function check in standby mode after 3 minutes.
• Switch to ventilation and call up CO
2
real-time curve.
• Test plausibility of CO
2
real-time curve and etCO
2
measured value by breathing through
the cuvette. Alternatively, test CO
2
measurement according to test items 9 to 9.2 of the
Test Certificate.
• Check electrical safety following test items 10 to 10.3.1 of the Test Certificate.
R 84
R 25
V13
R 78 R 58 R 92
V14
R 27
R 24
U 8
U 9
U 11
R 77
V15
R 28
R 82 R 85