20 February, 2001 LASER EXPOSURE
6-31
Detailed
Descriptions
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.
The laser diode power is adjusted on the production line.
NOTE: Do not touch the variable resistors on the LD unit in the field.
LD Drive Board
LD
PD
+5VLD
Sync
Detector
XLDENB
+5VLD
Video Data
(1 bit)
XDETP
GND
APC_SH
LD PD
1
M61880
B039D013.WMF
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