TPS 901-PH - pH and mV Troubleshooting Guide

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10. Troubleshooting
10.1 General Error Messages
Error Message Possible Causes Remedy
Not Factory Cal.Not Factory Cal.
(displayed at turn-on)
The EEPROM chip which
contains the factory
calibration information has
failed.
Switch the 901-PH off,
wait 10 seconds, and try
switching on again.
If message persists, then the
unit must be returned to
TPS for service.
EEPROM WriteFailEEPROM WriteFail
then:
Contact FactoryContact Factory
(displayed at calibration
or set-up).
Storage of user calibration
settings to the EEPROM
has failed.
Switch the 901-PH off,
wait 10 seconds, and then
switch the unit on again.
Attempt calibration/setup
again.
If message persists, then the
unit must be returned to
TPS for service.