Circuit Descriptions
5-8
Samsung Electronics
5-2-2 Circuit description (FLY-Back PWM (Plise Width Modulation) Control)
5-1-2 (a) AC Power Rectification/Smoothing Terminal
1) PDS01, PDS02, PDS03, PDS04 : Convert AC power to DC(Wave rectification)
2) PEF10 : Smooth the voltage converted to DC(Refer to VIN of Fig. 5-17)
3) PLF01, PLS01, PCF01, PCF02, PCD01, PCD03, PCS03 : Noise removal at power input/output
4) PVA1 : SMPS protection at power surge input (PVA1 pattern open is to remove noise)
5) PR10 : Rush current limit resistance at the moment of power cord insertion.
Œ
Rush current = (AC input voltage x 1.414 - Diode drop voltage) / Pattern resi PLF01, PLS01
resi PCD01 resi PRF10) (AC230V based : approx. 26A)
´
Without PRF10, the bridge diode might be damaged as the rush current increases.
5-2-2 (b) SNUBBER Circuit : PRS11, PRS12, PRD12, PCD12, PDS11, PCF11
0
Vswitch
dt
Toff
t
Inverted power
by leakage
inductance
Fig. 5-17
5-2-2 (c) PICF1 Vcc circuit
1) PCD11, PCF12, PCF13, PCF14 : PICF1 driving resistance
(PICF1 works through driving resistance at power cord in)
2) PICF1 Vcc : PDF13, PRF16, PEF12
Œ
Use the output of transformer as Vcc, because the current starts to flow into transformer while
PICF1 is active.
´
Rectify to PDF13 and smooth to PEF12.
ˇ
Use the output of transformer as PICF1 Vcc : The loads are different before and after PICF1 driving.
(Vcc of PICF1 decreases below OFF voltage, using only the resistance due to load increase after PICF1 driving.)
Summary of Contents for dvd-711
Page 29: ...Reference Information 2 22 Samsung Electronics MEMO ...
Page 45: ...4 14 Samsung Electronics Disassembly and Reaasembly MEMO ...
Page 71: ...Circuit Descriptions 5 26 Samsung Electronics MEMO ...
Page 83: ...Troubleshooting 6 12 Samsung Electronics MEMO ...
Page 89: ...Exploded Views and Parts List 7 6 Samsung Electronics MEMO ...
Page 99: ...8 10 Samsung Electronics Electrical Parts List MEMO ...
Page 103: ...PCB Diagrams 10 2 Samsung Electronics 10 1 Main COMPONENT SIDE SOLDER SIDE ...
Page 104: ...PCB Diagrams Samsung Electronics 10 3 10 2 Jack ...
Page 105: ...PCB Diagrams 10 4 Samsung Electronics 10 3 Key 10 4 Deck ...
Page 106: ...Samsung Electronics 11 1 11 Wiring Diagram ...
Page 107: ...Wiring Diagram 11 2 Samsung Electronics MEMO ...
Page 109: ...Schematic Diagrams 12 2 Samsung Electronics 12 1 Power 120 127 Voltage ...
Page 110: ...Schematic Diagrams Samsung Electronics 12 3 12 2 Power Free Voltage ...
Page 111: ...Schematic Diagrams 12 4 Samsung Electronics 12 3 Main Micom ...
Page 112: ...Schematic Diagrams Samsung Electronics 12 5 12 4 Servo ...
Page 113: ...Schematic Diagrams 12 6 Samsung Electronics TO AUDIO 5 1 CHANNEL 12 5 Video RCA Jack Output ...
Page 114: ...Schematic Diagrams Samsung Electronics 12 7 TO AUDIO 5 1 CHANNEL 12 6 Video SCART Jack Output ...
Page 115: ...Schematic Diagrams 12 8 Samsung Electronics TO AUDIO 5 1CHANNEL 12 7 Audio ...
Page 116: ...Schematic Diagrams Samsung Electronics 12 9 12 8 Audio 5 1 Channel ...
Page 117: ...Schematic Diagrams 12 10 Samsung Electronics 12 9 RF ...
Page 118: ...Schematic Diagrams Samsung Electronics 12 11 12 10 ZiVA A V Decoder ...
Page 119: ...Schematic Diagrams 12 12 Samsung Electronics 12 11 DSP ...
Page 121: ...Schematic Diagrams 12 14 Samsung Electronics 12 13 Headphone ...
Page 122: ...Schematic Diagrams Samsung Electronics 12 15 12 14 Key ...
Page 123: ...Schematic Diagrams 12 16 Samsung Electronics 12 15 Deck ...
Page 124: ...Schematic Diagrams Samsung Electronics 12 17 12 16 Remote Control ...
Page 125: ...Schematic Diagrams 12 18 Samsung Electronics MEMO ...