Bayer HealthCare RapidPoint 400 Series Service Manual page 213

Message
D77 Qualifier Descriptions
D77 indicates a CO-ox sample chamber temperature error is detected if:
• during shutdown and restart of the thermal system, the measured
temperature of the CO-ox sample chamber is beyond the range of
0.7 to 50°C.
• during normal operation when more than 15 minutes has elapsed
since thermal system startup and
the system is not currently running a fluidic operation and has not run
one for 60 seconds, and
the measurement cartridge door is closed, and
the CO-ox sample chamber is beyond the range of 36.85 to 37.25°C.
• the error is generated if the temperature is beyond the range of 36.85
to 37.25°C and is still out of range 15 minutes after the temperature
operational exception is detected.
CO-ox results are not reported, all other parameters in calibration report
results.
CO-ox sample results are not reported until the error is cleared.
.
Rev. C
Probable Cause and Corrective Action
Service Solutions
Perform service solutions only after all other corrective
actions have been completed.
1. Perform the temperature test with the measurement
cartridge simulator installed.
Repeat test and look for temperature increase.
2. If temperature increases over time, replace the
measurement cartridge.
3. If temperature fails to increase, check cables and
connections to and from the cartridge interface assembly.
4. Repeat temperature test.
5. Replace the sample chamber interface assembly.
6. Repeat temperature test.
7. Replace connector block.
Troubleshooting 213