Laser Diode Pcb - Kyocera Mita KM-1530 Service Manual

2-3-4 Laser diode PCB

Photo
sensor
PH1
The laser diode PCB (LDPCB) consists of the laser diode LD1 and laser driver IC1.
The laser driver IC1 on the laser diode PCB (LDPCB) turns the laser diode LD1 on and off according to the image data
received from the main PCB (MPCB). Upon detection of a laser beam from the laser diode LD1, the photo sensor PH1
outputs a horizontal sync signal (/BD) to the main PCB (MPCB).
The laser diode PCB (LDPCB) adjusts the laser diode drive current (APC) for each line scanned outside the image area
when /ADJUST is low to keep the laser beam output constant.
Terminals (CN) Voltage
1-2 1-7 0/5 V DC
1-3 1-7 0/5 V DC
1-4 1-7 0/5 V DC
1-6 1-7 5 V DC
1-8 1-7 0/5 V DC
Laser diode PCB
/ADJUST
Laser driver
IC1
LD1
/ENABLE
/VIDEO
/BD
Figure 2-3-8 Laser diode PCB block diagram
LCDPCB S/H signal, input
LCDPCB VIDEO signal, input
LCDPCB ENABLE signal, input
5 V DC supply for LCDPCB, input
LCDPCB HSYNC signal, output
Main PCB
Driver
Remarks
2AV/X
2-3
2-3-15