4.6.8 Heat Sink Sensor Thermistor
Use the service screen to read the resistance of the heat sink sensor.
Thermistor Control bd J3 pins 1-2
Temperature (C) Resistance (Ohms)
20 25000
25 20000
30 16102
35 13048
40 10636
80 2506
90 1827
100 1353
110 1017
120 775
4.6.9 E-base Motor and Canopy Motor
If you must replace a footswitch when the bed is all the way down, use pedal screen on service screen to raise
or lower the bed.
To troubleshoot the canopy clutch and roll pins, run the e-base all the way up. Take the bottom end cap oî º the
rail and the back panel oî º the electrical enclosure. Use a ash bulb to look up into the rail and see what moves
when the canopy slips. If the motor coupler is turning, then either the slip clutch or one of the roll pins is missing
or defective. If the clutch turns and not the sprocket, then the problem is a defective slip clutch. If neither turns,
the problem is probably a sheared roll pin.
The e-base motor and canopy motors are driven by the same circuits. The e-base is always driven at 24 volts
DC (acceptable range 24-32), and the canopy motor is driven at 24 volts (acceptable range 24-32) when going
up and 12 volts (acceptable range 12-16) when going down.
62 6600-0343-000 104 © 2001 by Datex-Ohmeda, Inc.. All rights reserved.
Chapter 4: Troubleshooting
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