B245/B276/B277/B268/B269 Service Manual 18-Jan-06
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Auto Power Control (APC)
The LD driver IC drives the laser diode. To prevent the intensity of the laser beam from
changing because of the temperature, the machine monitors the current passing through the
laser diode (LD). The machine adjusts the current to the laser diode by comparing it with the
reference level from the reference circuit.
This auto power control is done just after the machine is turned on and during printing.
The laser diode power is adjusted on the production line.
Do not touch the variable resistors on the LD unit in the field.
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