Got this out of the archives (however it is for the 1272, although it should work the same):
"You push the 'page' button repeatedly until the hour counter appears. If I am not mistaken, the projector has to be in service mode first, which means holding down the 'test' key until you are prompted to push the 'up arrow?' to enter service mode."
"After entering the serviceman mode and pressing page 5 times you'll see "1. CRT TIMER DISPLAY". When hilighted press right once"
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