Orion Benchtop pH/ISE Meter Instruction Manual
Troubleshooting
67
Chapter X
Troubleshooting
A. Self-Test
The self-test is performed by holding yes down while the meter is being
powered on.
NOTE: Before starting the self-test securely attach the
shorting cap to the electrode input(s).
During the self-test the meter will display the number of the test being
performed. If any problems are found, an operator assistance code
corresponding to the test that failed will be displayed. See Table 1 under
operator assistance codes. Should an operator assistance code appear
during self test, press yes to acknowledge and continue the test. Check to
make sure the shorting cap is securely attached then repeat the test. If the
problem persists, contact Technical Service Department at 1-800-225-1480.
Orion 410Aplus, 420Aplus and 710Aplus: During the self-test the meter
displays the code 7E57 in the main display and the number of the test
being performed in the lower display. Additional meter displays occur
depending on the test being performed.
Orion 520Aplus, 525Aplus, 720Aplus, and 920Aplus: During the self
test the meter displays the number of the test in the prompt line. Example:
TEST 1
NOTE: Ensure shorting cap is on the meter prior to self-test.
Test Function/Display Sequence
TEST #1 Segment Display Checks meter display. Ensure all
segments are lit at this time.
TEST #2 RAM Check Verifies the external RAM is
functioning properly.
TEST #3 External Input 1 Checks the electrode input channel
1. The shorting cap must be
connected for this test to pass
properly.
TEST #4 External Input 2 Checks the electrode input channel
2. The shorting cap must be
connected for this test to pass
properly.
TEST #5 Internal Reference Checks the internal reference on
the meter.
TEST #6 Ground Reference Checks the meter ground.
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