Oki C7200 Service Manual page 73

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When the toner low condition is detected 20 consecutive times, toner low is determined. (The toner low message is displayed when about 500 A4 sheets at
5% density have been printed after toner low had been detected.)
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When the toner full condition is detected 10 consecutive times, toner low is removed.
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When the toner sensor remains unchanged for more than 15 cycles of 2.3 seconds, the toner sensor alarm is activated.
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The toner sensor does not perform the detection while the drum motor is not running.
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