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12
UF-7300/7200
UF-8300/8200
2.2.5.
Laser Scanning Unit Control Circuit
The Laser Unit consists of Laser Drive Circuit and LSU Motor Drive Circuit.
Laser control signals are as follows.
Laser control signals are as follows.
nVIDEO:
This is actual data being printed.
nLDON:
When the nLDON signal is Low, the Laser Unit is activated.
When OPC Drum Unit is not installed, the Laser Unit is deactivated.
When OPC Drum Unit is not installed, the Laser Unit is deactivated.
nHSYNC:
This is the horizontal synchronizing signal sent from the Timing Sensor (Laser Beam
Detect Sensor) which detects the horizontal position of the Laser Beam across the
drum.
Detect Sensor) which detects the horizontal position of the Laser Beam across the
drum.
nADJUST:
When the nADJUST signal is Low, APC (Auto Power Control) is activated.
nSNRCTL:
This is the LSU Motor Control Signal.
nSNRLD:
The PLL (Phase Locked Loop) maintains the LSU Motor speed at approx. 26K rpm.
When the SNRLD is Low, the LSU Motor rotates (approx. 26K rpm).
When the SNRLD is Low, the LSU Motor rotates (approx. 26K rpm).
nSNRCLK:
This is the LSU Motor reference clock (approx. 2.6KHz).
nVIDEO
nLDON
nHSYNC
nADJUST
nHSYNC
nADJUST
nVIDEO
nLDEN
nBD
nADJUST
Laser
Diode
Diode
Toner Cartridge
LSU
Motor
Motor
LSU
(Laser Scanning Unit)
SPC PC Board
IC402
IC006
(Engine CPU)
GND(+24V)
50
5
36
30
R422
+24V
GND (+24V)
nSNRCTL
nSNRLD
nSNRCLK
+24V
SNRCLK
SNRCTL
nPUNIT
nSNRLD
R523
Q509
Q510
C523
C421
C418
C420
PPG02
P14
P52
P30
R520
69
67
66
68
66
68
L400
C419
R409
R419
R407
R408
IC407
R522
+5VSP
C530
C527
IC401
C427
C531
R532
R533
(ASIC)
Sensor
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