Panasonic UF-6300 Service Manual page 201

nS/H
This is the Sample Hold Signal in order to adjust the Laser power. When the Laser switches on
compulsorily, the Laser Power is adjusted to a suitable level and held until the next duty cycle in order to
keep the Laser Power stable.
IC3
SHINE
6.2.13 Power Supply Unit (LVPS)
INPUT
RECTIFIER
INPUT
CIRCUIT
CIRCUIT
A-B Voltage
0
C-D Voltage
0
E-F, G-H Voltage
0
Q24
20
IC34
19
24
163
R328
IC35
23
30
21
SC PCB
Laser Unit Control Circuit Block Diagram
A CONVERTER
CIRCUIT
(Q100)
C103
C
B
D
CONTROL
CIRCUIT
OVER CURRENT
LIMITTER
CN68
nS/H
1
nVIDEO
6
nLDON
Q23
5
+5V
2 nHSYNC
nPMON
Q21 3
+3.3V
nPMRY
2
R326
nPMCK
1
CN69
Q22
GND
OUTPUT
CIRCUIT
OUTPUT
CIRCUIT
+24 VDC
OUTPUT
CIRCUIT
ERROR DETECTION
CIRCUIT
201
Laser
Drive
Laser
Circuit
Timing
Sensor
Scanner
Motor
Drive
Circuit
Scanner
Motor
LSU
+5 VP OUTPUT
CIRCUIT
+5 VDC
-5 VDC
+5 VP OUTPUT
GND
+5 VP OUTPUT
GND
GND
-5 VDC OUTPUT
+24 VDC OUTPUT
GND