Oki OKIOFFICE 84 Service Manual page 399

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Setting of the chopping operation
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Setting of the motor excitating method (1-2/2-1 phase excitation)
a) Send motor rotation control
There are several cases of the rotation operation:
Forward rotation for feeding documents.
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Case 1: Feeding document from hopper to the position where one line data is read.
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Case 2: Feeding document while reading.
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Case 3: Feeding document after a page has been read.
b) Send motor chopper control
The purpose of chopper control is to reduce the current to the motor by setting the phase signal on and off
intermittently when a time lapse exceeding a specific time occurs without a phase update.
2) Clutch
When starting to print, performs the paper supply of recording paper by using this clutch. Clutch is driven by clutch
signal generated from IOGA4.
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