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MODEL 3081 pH/ORP SECTION 12.0
TROUBLESHOOTING
If the sensor is not rebuildable...
Try the reference electrode rejuvenation procedure described in Section 11.3.4.
If the rejuvenated sensor can be calibrated, the problem has been corrected.
If the sensor cannot be calibrated, replace the sensor.
12.4.12 rOM FAIL or CPU FAIL
rOM FAIL or CPU FAIL means the transmitter electronics have failed. Replace the electronic board stack (PN 23574-02).
12.4.13 AdC WArn or CyCLE PWr
The AdC WArn or CyCLE PWr message appears momentarily when the transmitter has recognized an internal calcula-
tion problem. The transmitter repeats the calculation, and the message disappears once the calculation is successful. If
the message is displayed constantly, the transmitter electronics may be faulty.
Troubleshooting-AdC WArn or CyCLE PWr
A. Check transmitter performance by simulating pH inputs. See Section 12.8.
If the transmitter performs satisfactorily, go to step B.
If the transmitter does not respond to simulated inputs, replace the board stack (PN 23574-02).
B. If the transmitter responds to simulated inputs, the problem must lie with the sensor or the interconnecting wiring.
Verify the interconnecting wiring point to point. Fix or replace bad cable. If cable is good, replace the pH sensor.
12.4.14 WritE Err
WritE Err means that jumper JP1 on the CPU board is not in place. If the jumper is not in place, the transmitter cannot be
programmed or calibrated.
Troubleshooting-WritE Err
Refer to Section 2.2. Check the position of jumper JP1 on the CPU board. If the jumper is hanging off one of the pins, place
it across both pins. If the jumper is missing entirely, use jumper JP3 (50/60 Hz), which is not a critical jumper. THERE ARE
SIMILAR NUMBERED JUMPERS ON THE ANALOG BOARD. THE JUMPER TO BE CHECKED IS ON THE CPU
BOARD, WHICH IS THE CENTER BOARD IN THE STACK. Turn the power to the transmitter off and then back on.
Toggling the power should cause the message to disappear.
If the message does not disappear, replace the electronic board stack (PN 23574-02).