Teledyne MX300-I manual Watchdog, Error Codes

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Service Manual

MX300-I

 

 

 

Symptom

Why

What To Do

Cannot adjust

Critical settings require

A) If display is not flashing

calibration or alarm

two keys be pressed in

press lock key once to

settings

a specific order.

activate keys. Press desired

 

LOCK/UNLOCK key is

function followed by the Up

 

and Down key.

 

active

 

 

 

 

 

Note: In the event that none of these procedures produce desired results, remove the batteries and return the unit to Teledyne for repair.

3.9 Watchdog

The MX300-I is equipped with a watchdog circuit that continuously monitors the electronics for proper operation. If the watchdog detects a failure, one of the following codes will appear on the LCD.

The error codes can appear on the LCD when batteries are first installed, during normal operation or if the unit is subjected to extreme shock. In some cases an additional digit is used in the error code to supply additional information. For example, the error code 6 and 7 are followed by another digit listed as (N) in Table 3.2. The error code 65 would indicate that a key is stuck and this key is the Silence key.

In addition to supplying visual error codes, the audio device will beep a number of times to indicate the general error in case the display is not functional.

NOTE: To reset the watchdog error code. Remove one battery for 5 seconds and replace. If the error persists contact your local representative or Teledyne for assistance.

Table 3-2 Error Codes

Error Code

Audio Beeps

Error

Indeterminate

2

The watchdog timer has timed out indicating a

 

 

serious software error

30

3

Analog output is different from the expected value.

 

 

May indicate a shorted or over-loaded analog

 

 

output or a failure of the analog to digital converter

 

 

or digital to analog converter circuit.

Teledyne Analytical Instruments

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Contents MX300-I MX300-I How To Use This Manual About This ManualSafety Messages Table of Contents Appendix List of Figures MX300-I Front ViewList of Tables Introduction MX300-I Front ViewApplicable Standards Introduction MX300-IFeatures OptionsApplications Theory of OperationSignal Processing SensorIntroduction MX300-I Setup OperationSensor Installation or Replacement Installing the R17MED SensorSensor Cable Connection to Monitor V-Mount Adapter Installation MountingBattery Installation Installing BatteriesCalibration Calibration SequencePortable Oxygen Monitor Operation Alarms Setting the AlarmsOutput 0-1 VDC or RS232 0-1 VDC or RS 232 Digital Output Port Procedure UseGas Sampling HumidityTemperature PressureDiscrepancy in Readings Anesthetic GasesOxygen Reading Error in a Mixture of Anesthetic Gas Cleaning Do’s and Don’tsPortable Oxygen Monitor Operation Operation MX300-I Overall Maintenance General Service InformationBattery Maintenance Sensor Maintenance CalibrationAlarms Pressure Troubleshooting Troubleshooting√ Sensor Ventilate the patient, water Error Codes WatchdogOther Problems with the Instrument Return Authorization for Service Specifications AppendixSpare Parts List Optional AccessoriesOrders should be sent to Blank Index CrossoverIndex MX300-I