A number of diagnostic readings appear on the right side of the service screens.
Figure 4-6 Service Screen
HFS High fan speed. Should be 1500 +/- 100 (measured at power up only).
LFS Low fan speed. Should be 1000 +/- 100 (measured at power up only).
RH Relative Humidity. % humidity read in the patient chamber.
SR Scale counts raw.
SC Scale counts corrected. (1 count = 1 gram)
ADT
Air display temperature. Temperature read by the îš¿rst thermistor in the compartment air
probe. Should be + 0.3ºC of ACT temperature.
ACT
Temperature read by second thermistor in the compartment air probe. Should be + 0.3ºC of
ADT temperature.
P11 Reading from the rst thermistor in patient jack 1. Should be +/- 0.5ºC of P12 temperature.
P12 Reading from the second thermistor in patient jack 1. Should be +/- 0.5ºC of P11 temperature.
P21 Reading from the rst thermistor in patient jack 2. Should be +/- 0.5ºC of P22 temperature.
P22 Reading from the second thermistor in patient jack 2. Should be +/- 0.5ºC of P21 temperature.
HSP
Heat sink sensor resistance. Should be 20000 ohms @ 25ºC. Refer to the Tips section (4.6.8) for
resistance verses temperature values.
LV1 Line voltage in îš¿rst mains circuit. Should be +/- 4V of LV2.
LV2 Line voltage in second mains circuit. Should be +/- 4V of LV1.
LF 60Hz or 50Hz.
MC Motor current. Shows current drawn by the canopy or e-base motor.
TV Thermistor voltage. Voltage of thermistor circuits located on the mother board.
5V Power supply voltage. Should be + 0.25V of 5V.
VR Voltage reference. Independent voltage reference. Should be 1.235V + 1%.
DV DAC output voltage. It should match the DAC volt value within 10 mV.
BV Used for manufacturing only, not for service use.
Across the bottom of the screen the date of last time the temperature and line voltage calibration was
performed appears plus the current time settings of the unit.
© 2001 by Datex-Ohmeda, Inc.. All rights reserved. 6600-0343-000 104 33
Chapter 4: Troubleshooting
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