Image forming apparatus
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United States of America Patent
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Nov 26, 2019
Grant Date -
Apr 4, 2019
app pub date -
Sep 26, 2018
filing date -
Sep 29, 2017
priority date (Note) -
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Abstract
Optical scanning devices each have a Hall device for outputting a rotation signal by detecting a rotation of a motor. An optical scanning device controller has ASICs for performing startup control of the optical scanning devices, a CPU for controlling the ASICs, and a power supply path for supplying power to the optical scanning devices. The ASICs each have a FG counter for counting a clock signal and having a counter value to be reset by a rotation signal output from the Hall device. In a case where the motor is not normally driven when the optical scanning devices are started up, the CPU notifies an abnormality of the power supply device or the power supply path, based on a counter value of the FG counter acquired from each of the ASICs.
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