HL-3450CN SERVICE MANUAL
4-23
1.5
Scanning System
This printer employs a semiconductor laser diode as a light source. This laser diode is
switched according to the transmitted image data (video signal).
The generated laser light scans over the OPC belt through a polygon mirror and lens, by
which method electrostatic latent images will be formed on the OPC belt.
(1)
Structure of the Scanning System (Refer to Fig.4-24.)
The scanner unit is located as shown in Fig.4-8.
The scanner unit consists of the following parts;
c
Scanner Unit:
Light emitting source incorporating a laser diode.
d
Cylinder lens:
Condenser for the laser beam.
e
Polygon mirror:
Hexahedral mirror for scanning the laser beam.
f
F-
6
lens:
Focus lens for the laser beam.
g
Scanner motor:
Motor to rotate the polygon mirror.
h
Mirror:
Reflecting mirror for the laser beam path.
i
LDC:
Laser diode control circuit.
j
PD: Beam
detector.
k
BTD mirror:
Beam timing detector mirror to guide the laser beam
to the PD sensor.
8
9
6
4
5
3
1
7
2
2
Fig. 4-24
Scanner Unit box
Dust proof glass
Developer belt
Summary of Contents for HL-3450CN Series
Page 15: ...HL 3450CN SERVICE MANUAL xiii 3 Rating Label For US For Europe 4 Operation Label 5 Jam Label ...
Page 17: ...HL 3450CN SERVICE MANUAL CHAPTER 1 PRODUCT OUTLINE ...
Page 27: ...HL 3450CN SERVICE MANUAL CHAPTER 2 SPECIFICATIONS ...
Page 39: ...CHAPTER 3 INSTALLATION ...
Page 54: ...HL 3450CN SERVICE MANUAL CHAPTER 4 STRUCTURE OF SYSTEM COMPONENTS ...
Page 104: ...HL 3450CN SERVICE MANUAL 4 51 Main PCB Circuit Diagram 1 8 CODE B512137CIR 1 8 LJ8907001 NAME ...
Page 106: ...HL 3450CN SERVICE MANUAL 4 53 Main PCB Circuit Diagram 3 8 CODE B512137CIR 3 8 LJ8907001 NAME ...
Page 108: ...HL 3450CN SERVICE MANUAL 4 55 Main PCB Circuit Diagram 5 8 CODE B512137CIR 5 8 LJ8907001 NAME ...
Page 110: ...HL 3450CN SERVICE MANUAL 4 57 Main PCB Circuit Diagram 7 8 CODE B512137CIR 7 8 LJ8907001 NAME ...
Page 126: ...HL 3450CN SERVICE MANUAL CHAPTER 5 CONTROL PANEL OPERATION ...
Page 173: ...HL 3450CN SERVICE MANUAL CHAPTER 6 PERIODIC MAINTENANCE ...
Page 208: ...CHAPTER 7 DISASSEMBLY RE ASSEMBLY ...
Page 264: ...HL 3450CN SERVICE MANUAL CHAPTER 8 TROUBLESHOOTING ...
Page 310: ...HL 3450CN SERVICE MANUAL 8 47 5 IMAGE FAILURE 1 2 3 4 5 6 7 8 9 a 9 b 10 11 12 13 14 ...
Page 311: ...CHAPTER 8 TROUBLESHOOTING 8 48 15 a 15 b 16 17 18 19 20 21 22 23 24 25 26 27 28 244m m 29 ...