HAKUBA 26PPM Laser Printer - Base Engine Technical Manual
13-37
Version 1.0
Principles of Operation
PWBA
SOS (Start Of Scan):
A sensor that is in-line with the scanning
laser beam. The laser beam strikes the PWBA SOS at the start of each
scan to let the printer control circuity know that a new scan is beginning.
The Structure and Operation of the ROS
The laser light source for the ROS is a semiconductor laser diode with a
maximum output of 3mW. A monitor circuit keeps laser output at a con-
stant level. Image data received from the print controller modulates the
laser beam, turning it on and off according to image information.
The Current Switching Circuit switches the Laser Diode On and Off
according to /nP.DATA sent by the PWBA HKB26 MCU. When /nP.DATA
is LOW, the laser is ON. When /P.DATA is HIGH, the laser is OFF.
The PWBA HKB26 MCU also supplies the laser drive current (VL1 and
VL2). Circuits within the laser use VL1 and VL2 to maintain a constant
drive current for the laser diode. If either VL1 or VL2 changes value, the
current in IL1 or IL2 change accordingly. The current flowing through the
laser Diode (IL) changes, as does the current flowing through PD. PD
monitors laser current, and supplies that information back to the MCU.
When you use Configuration Mode to adjust laser current, you are adjust-
ing VL1 or VL2, so MO equals the value stored in NVRAM.
Figure 32. Laser Diode Current Control
Summary of Contents for b 6100
Page 1: ...HAKUBA 26PPM Laser Printer Base Engine Technical Manual Version 1 0...
Page 8: ...viii HAKUBA 26PPM Laser Printer Base Engine Technical Manual Version 1 0 Blank Page...
Page 124: ...8 2 HAKUBA 26PPM Laser Printer Base Engine Technical Manual Version 1 0 Diagnostic Mode...
Page 146: ...8 24 HAKUBA 26PPM Laser Printer Base Engine Technical Manual Version 1 0 Diagnostic Mode...
Page 148: ...9 2 HAKUBA 26PPM Laser Printer Base Engine Technical Manual Version 1 0 Adjustment Mode...
Page 152: ...9 6 HAKUBA 26PPM Laser Printer Base Engine Technical Manual Version 1 0 Adjustment Mode...
Page 396: ...12 26 Hakuba 26PPM Laser Printer Base Engine Technical Manual Version 1 0 Parts List...