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FO-3150U/C
2) Laser beam power control
The laser beam power is controlled in the laser emitting unit PWB.
This circuit functions to keep the laser beam output power at a constant
level.
The laser beam output is monitored with photo diode LD601 for monitor.
When the laser beam output rises above the specified value, the imped-
ance of photo diode LD601 is decreased to decrease the monitor input
(3PIN) voltage of the laser diode control IC (IC701).
Then the laser diode (LTO28GS) drive voltage is decreased to decrease
the laser beam output to the specified level.
When the laser beam output is decreased below the specified level, the
contrary operation are performed.
f. Laser scanning unit
This unit controls the laser beam power and laser beam scanning.
The control is performed with the signals inputted outputted to or from
the CPU and ASIC.
1) Signal functions
PMCLK
Clock signal for driving the scanning motor. (770Hz)
PMD
Scanning motor ON/OFF signal.
APCSTT
Used to start the laser beam generation circuit.
SYNC
This signal is outputted when the laser beam scanned by the laser
beam sensor signal is sensed by sensor (Photo diode D601).
Used for the left margin control.
VIDEO
This signal is used to control the laser diode emitting.
Not only when the laser beam is emitted to perform the LEND proc-
ess, but also when the laser beam is emitted as image data, ASIC
controls and the signal is outputted from video terminal.
CN601
PM-CN
LSU-CN
CN701
+5VL
+24V
10k
R702
1
IC701
1
2
3
7
8
9
10
12
13
14
15
16
17
18
20
C710
0.1uF
/VIDEO
VR601
5k
1
3
C714
N.M
C711
N.M
SHOLD
C709
0.1uF
+5VL
C713
1uF
R713
1M
4
+5VL
R706
+5VL
R704
100
C712
N.M
N.M
N.M
C702
C704
/VIDEO
SHCLD
+5VL
M66515FP
1
2
LD
PD
LD601
RLD78NP
10k
R705
PMCLK
PMRDY
PMD
GND
+24V
2
1
3
4
5
100
R701
R707
100
+24V
/PMD
PMRDY
PMCLK_A
/SYNC
+5V
/VIDEO
DG
APCSTT
SAMP
DG
RS
AGND
RB
VB
Vref
VR
CH
/SH
Vcc1
TEST
DVcc
RO
NC
LD
DGND
PO
/DATA
/ENB
2RM
1RM
R712
2k
CN703
BD-CN
+5V1
/SYNC1
GND1
1
2
3
APC PWB
BD PWB
R715
380
R714
N.M
C705
R709
R708
22
33pF
33
C707
C706
0.1uF
0.1uF
CN702
BD-CN
+5V1
/SYNC1
GND1
1
2
3
C708
0.1uF
1
3
2
Q701
2SA1570A
R711
100
R710
1k
3
1
2
Q702
2SC4081
1
2
D601
HPI-5FCR2
C701
0.1uF
R703
100k
+5VL
10k
C703
0.1uF
C601
47uF/10V
19
5
6
11
2
3
4
5
6
7
8
9
10
11
2
Fig. 14
5 – 15
Содержание FO-3150
Страница 107: ...FO 3150U C 6 9 Control PWB parts layout Top side ...
Страница 108: ...FO 3150U C Control PWB parts layout Bottom side 6 10 ...
Страница 112: ...FO 3150U C 6 14 TEL LIU and Hook SW PWB parts layout Top side ...
Страница 113: ...FO 3150U C TEL LIU and Hook SW PWB parts layout Bottom side 6 15 ...
Страница 116: ...FO 3150U C 6 18 Printer PWB parts layout ...
Страница 118: ...FO 3150U C Power supply PWB parts layout Top side 6 20 Power supply PWB parts layout Bottom side ...
Страница 120: ...FO 3150U C 6 22 Operation panel PWB parts layout Note Since the parts of PWB cannot be supplied change it as a unit ...
Страница 132: ...FO 3150U C 5 4 Drive unit 5 Scanner frame unit 9 1 7 8 2 5 6 4 3 B1 B1 7 8 5 5 6 B1 B1 6 Drive unit 1 2 4 12 3 9 10 11 ...
Страница 136: ...FO 3150U C 9 7 Upper frame 7 16 5 1 6 3 14 8 3 B2 B1 B2 B1 B3 W1 W2 W3 19 4 21 22 10 17 11 2 13 9 12 20 18 1 15 ...