Oki LD670 User Manual page 157

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ADJUSTMENT
1) When "ADJUSTMENT" is printed, press and hold down the FEED switch for
one second or longer to start sensor adjustment.
a. The printer prints the selection items.
2) The printer prints "BM SENSOR," "LABEL SENSOR," "PNE SENSOR,"
"PE SENSOR," "BM SENSOR," and so on cyclically in this order.
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