Read Panasonic UF-7000 / UF-8000 / UF-7100 / UF-8100 (serv.man2) Service Manual online
12
SEPT 2005
Ver. 2.0
UF-7100/8100
UF-7000/8000
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
LSU
Motor
Motor
Process
Interlock SW
+5V (LD)
GND (+5V)
LSU
(Laser Scanning Unit)
Engine Control PC Board
IC001
(ASIC)
IC006
(Engine CPU)
+5V
GND (+5V)
GND(+24V)
48
50
5
36
30
R042
R043
R041
R040
+24V
GND (+24V)
nSNRCTL
nSNRLD
nSNRCLK
+24V
SNRCLK
SNRCTL
PUNIT
nSNRLD
R091
Q010
Q011
C088
C028
C1
14
C023
PPG02
P14
P52
P30
LD5VSW
R090
69
67
66
68
66
68
L023
C021
C018
R006
R028
C054
R038
R011
R015
R092
+5VSP
C093
C090
C089
IC009
C042
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