Service manual

5-30 Samsung Electronics
5-3-1 BLOCK DIAGRAM OF POWER CIRCUIT
Refer to the following block diagram.
5-3 SMPS
INLET
INPUT
FILTER
SNUBBER
CIRCUIT
START-UP
CIRCUIT
HALF WAVE
RECTIFIER
HALF WAVE
RECTIFIER
HALF WAVE
RECTIFIER
VOLTAGE
DETECTION
OVER
VOLTAGE
PROTECTION
3-TERMINAL
REGULATOR
CH1
+5V
RED
#1
GND
BLACK
#2
CH3
+30V
GREEN
#6
CH2
+11.75V
YELLOW
#3
GND
BLACK
#4,#5
SWITCHING
DEVICE
PHOTO
COUPLER
Nb1
Nb1
Ns2
Ns2
Ns1
ERROR
AMPLIFIER
PWM
CONTROL
CIRCUIT
OVER
CURRENT
DETECTION
FULL WAVE
RECTIFIER
AC250V2A
N
5-3-2. SPECIFICATIONS OF POWER CIRCUIT
5-3-2-1. INPUT CONDITIONS
1) INPUT RATED VOLTAGE : AC220 - 240V FREE VOLTAGE
2) INPUT VOLTAGE TURNING RANGE : AC 85 - 270V
3) RATED FREQUENCY : 50 - 60 Hz
4) FREQUENCY RANGE : 47 - 63 Hz
5) INPUT CURRENT : 0.5Arms
AMUNDSEN & SMARTJET POWER
SUPPLY (220-240Vac)