Roche Diagnostics April 2007
Service manual · Version 2.0 C-5
91xx pH/Electrolyte Analyzers 11 Adjustments
Adjustments
Adjustments
The 9110, 20, 30, 40, 80 and 81 Analyzers have been designed to require minimal
electronic adjustment. The sample contact circuit may require adjustment following a
change of the sample contact components or during a routine troubleshooting (9110
only) or the sample sensor circuit may require adjustment following a change of the
sample sensor or during routine troubleshooting. The temperature adjustment is
active only for models 9110/9140/9180/9181 and requires the temperature
adjustment test plug for correct calibration of the temperature circuit.
Sample contacts adjustment (9110 only)
In preparation for correct electronic adjustment, several steps must be performed.
a To adjust the sample contacts
1
Slide the electrode holder forward and remove the electrode from the analyzer.
2
Disconnect the intake tube from the preheater.
3
Remove the trim panel (located below the needle mechanism) and disconnect the
plug for sample contact 1.
4
Select [TEST SAMPLE CONTACTS] in the [SERVICE FUNCTIONS] menu and
adjust R10 (Display Board) for a reading of 140.
5
Reconnect sample contact 1 plug, intake tubing and electrode.
6
Check to ensure the value (140) remains the same.
e
For details, see Error messages and troubleshooting on page D-5.
Sample sensor adjustment (9120/9130/9140/9180/9181 only)
a To adjust the sample sensor
1
Select [TEST SAMPLE SENSOR] in the [SERVICE FUNCTIONS] menu which
will display the current sample sensor setting.
2
Adjust R93 Sample Sensor Adjust located at the top of the ISE SBC card to a value
of 100.
3
Press YES to turn on peristaltic pump and ensure displayed value remains
constant.
Raise sample door and aspirate clear fluid (e.g. water). Displayed reading should now
be 150 or greater.
Note
If the value drops after reconnecting each of the three sample contacts, follow the troubleshooting
guidelines for fault isolation.
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