Roche Diagnostics April 2007
D-6 Service manual · Version 2.0
13 Troubleshooting 91xx pH/Electrolyte Analyzers
Error messages and troubleshooting
Standard A sample is sensed, the peristaltic pump stops and measurement occurs. If
aspiration fails, the analyzer will wash and repeat up to 3 times.
Possible causes and remedies
o Check for air leaks preventing the Standard from being drawn into the chamber.
Ensure that all O-rings are in place.
There must be a continuous draw of standard solution, free of air bubbles.
o Check solenoid V for proper sealing of the vent line.
o Check fill port to ensure the absence of air leaks.
o Verify that the sample needle is not bent.
o Check/replace fill port and wash port to ensure the absence of air leaks (9110
only).
o Check for clots or crystals formed in the Standard A tubing or electrode chamber.
o Replace peristaltic pump tube set to ensure proper sample aspiration.
o Ensure that the preheater cable (9110 only) or the sample sensor is plugged in
securely and perform h [TEST SAMPLE CONTACTS] or h [TEST SAMPLE
SENSOR] to ensure correct operation. Clean, adjust or replace sample sensor to
correct sample sensor operation.
o Check the fluid remaining in the ISE SnapPak
TM
. If less than 5% remains, replace
the ISE SnapPak
TM
.
STANDARD B NOT DETECTED, STANDARD C NOT DETECTED (9180/9181 only)
The system for drawing Standard B or C is like that of Standard A. If Standard A is
drawn properly and Standard B or C is not detected, check Standard B tubing for
crystallization. Perform checks for Standard A detection problems to correct. During
the calibration sequence, Standard B or C is drawn into the measuring chamber prior
to Standard A, therefore check if Standard A calibrant can be properly detected to
isolate possible fluidic faults. If neither Standard A, B nor C are detected check for air
leaks or blockages within the fluidic path.
CHECK SAMPLE CONTACTS(9110), CHECK SAMPLE SENSOR (9120/30/40/80/
81)
The sample contacts must provide a reading of 135 - 145 when air is detected and the
sample sensor must provide a reading of 80 - 120 when air is detected.
Perform h [TEST SAMPLE CONTACTS] or h [TEST SAMPLE SENSOR] to
observe sample contact or sample sensor response. When clear fluid (e.g. water) is
aspirated, the sample sensor display must indicate an increase of of at least 40 units.
For blood samples (not transparent), the reading should decrease by at least 40 units.
The sample contacts can be adjusted (see cross reference below), the sample sensor is
calibrated with air during each calibration.
e
For details, see Sample contacts adjustment (9110 only) on page C-5.
Perform a calibration to remove the error message after troubleshooting.
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