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Service Guide ML520/521
Chapter 2 Principles of Operation
Low Motor Drive Voltage Alarm
+40V is converted into the POWLEV signal (0 vdc to +5 vdc) by the voltage divider network of R542 and
R544, then input to the A/D port of the MPU. The value of this voltage is used to control the drive time and
the print speed (pass number) of the head.
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