Samsung SF-4500 Service Manual page 59

6-4 SMPS
6-4-1 Block Diagram of Power Circuit
Refer to the following block diagram.
POWER SUPPLY
AC250V2A
INLET
a
N
b
AC220-240V2A
SWITCHING
DEVICE
OVER
CURRENT
DETECTION
6-4-2. Specifications of Power Circuit
6-4-2-1. INPUT CONDITIONS
1 Input Rated Voltage
2 Input Voltage Turning Range
3 Rated Grequency
4 Frequency Range
5 Input Current
6-28
INPUT FULL WAVE
FILTER RECTIFIER
START-UP
CIRCUIT
PWM
CONTROL
CIRCUIT
AC85–135Vac (b)
Ns1
SNUBBER
Nb1
CIRCUIT
Ns2
Nb1
Ns2
PHOTO
COUPLER
120V
AC120Vac (a) AC220–240Vac (a)
AC180–270Vac (b)
60Hz
57–63Hz
0.5Arms
HALF WAVE 3-TERMINAL
RECTIFIER REGULATOR
HALF WAVE
RECTIFIER
HALF WAVE
RECTIFIER
VOLTAGE
VOLTAGE
DETECTION
PROTECTION
ERROR
AMPLIFIER
a b
* ,
220V
50–60Hz
47–63Hz
0.3Arms
CH1
+5V
RED
#1
GND
BLACK
#2
CH3
+30V
GREEN
#6
CH2
+11.75V
YELLOW
#3
OVER
GND
BLACK
#4,#5
See Below Table
Free Voltage
AC110–240Vac (a)
AC85–270Vac (b)
50–60Hz
47–63Hz
0.5Arms
Samsung Electronics