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Knowledgebase Home > Timers & Counters

Why does my Tenor / ATC 650 series timer display show question marks (????) on the display?

Would you like to... Print this page Email this page Post a comment Subscribe me Add to favorites User Opinions How would you rate this answer? Helpful Not helpful Help us improve. Why was this unhelpful? Thank you for rating this answer. Check your internal configuration DIP switches.  You have chosen a setting that does not exist.  The configuration is invalid. Pertains to ATC and Tenor models 655, 651, 652, 653

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