Roche Diagnostics April 2007
Service manual · Version 2.0 B-67
91xx pH/Electrolyte Analyzers 10 Service functions
Service functions
Example displays
TEST PINCH VALVES
This test turns on/off each solenoid valve as indicated and is useful to verify both
electronic control and mechanical operation of each solenoid valve.
Example displays
TEST INTERFACE
The Interface Test can be used to verify correct operation of the RS232C serial port.
To operate this test, jumper pin 2 and pin 3 of the rear interface connector prior to
invoking the test. During the interface test, the analyzer sends out a test string and
checks if it is received within a set period of time. If correct operation is observed after
completion of the test, [INTERFACE OK] will be displayed.
TEST AMPLIFIER
The Amplifier Test displays ground, reference and output voltage of each input
amplifier. The values displayed for each electrode channel will be dependent on the
electrode inputs and may vary. Display of the ground should read between -10 mV
and +10 mV with the reference voltage reading between -2490 mV and -2510 mV.
With all inputs open, the display should read +/- 4095 for each channel. On the 9140/
9180/9181, an additional display indicating the temperature voltage and temperature
in degrees C is available to verify the temperature adjustment. On the 9110, the
temperature reading should be between 36.8 and 37.2°C.
Example display
---Test Pump!---
Very Slow Speed
---Test Pump!---
Slow Speed
---Test Pump!---
Medium Speed
---Test Pump!---
Fast Speed
Test Valve A:
YES/NO = ON/OFF
Test Valve B:
YES/NO = ON/OFF
Test Valve C:
YES/NO = ON/OFF
(9180/9181 only)
Test Valve V:
YES/NO = ON/OFF
Test Valve R:
YES/NO = ON/OFF
Na=#### K=####
Cl/Ca/Li=####
GND =0
-2500mV=-2499
Temp(mV) =-####
Temp(°C) = ##.#
(depending on parameter configuration) (9180/9181 only)
pH=####
(9110 only)
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