Laser Exposure
D017/D018/D019/D020 6-30 SM
6.6.2 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 while
the laser diode is active.
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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