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7. Schematic Diagrams
7-1 All block Diagram ----------------------------------------------------------------------------------------7-2 7-2 Power ------------------------------------------------------------------------------------------------------------7-3 7-3 S.M.P.S (S.M.P.S PCB) ----------------------------------------------------------------------------------7-5 7-4 Front Key (S.M.P.S PCB) ------------------------------------------------------------------------------7-6 7-5 Video (Main PCB) -----------------------------------------------------------------------------------------7-7 7-6 Audio (Main PCB) -----------------------------------------------------------------------------------------7-8 7-7 Memory (Main PCB) -------------------------------------------------------------------------------------7-9 7-8 Decoder (Main PCB) -----------------------------------------------------------------------------------7-10 7-9 Power (Main PCB) --------------------------------------------------------------------------------------7-11 7-10 Connector (Power Key PCB)- -------------------------------------------------------------------7-12 7-11 Power Key (Power Key PCB) -------------------------------------------------------------------7-13 7-12 Scart (Scart PCB) -------------------------------------------------------------------------------------7-14 7-13 Scart Connector (Scart PCB) -------------------------------------------------------------------7-15 7-14 Karaoke (Karaoke PCB) --------------------------------------------------------------------------7-16
For schematic Diagram - Resistors are in ohms, /8W unless otherwise noted. Special note : Most semiconductor devices are electrostatically sensitive and therefore require the special handling techniques described under the "electrostatically sensitive (ES) devices" section of this service manual. Note : Do not use the part number shown on this drawing for ordering. The correct part number is shown in the parts list (may be slightly different or amended since this drawing was prepared). Important safety notices : Components identified with the mark components. Use only the same type.

Note

have the special characteristics for safety. When replacing any of these

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Schematic Diagrams

7-1 All block Diagram

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Schematic Diagrams

7-2 Power
7-2-1 About S.M.P.S (Ringing Choke Converter Method)
u Terms 1)1st:Commonpowerinputto1stwinding. 2)2nd:Circuitfollowingsoutputwindingoftransformer. 3)f(Frequency):Switchingfrequency(T:Switchingcycle) 4)Duty:(Ton/T)x100 (b)SNUBBERCircuit: PDS11,PCD12,PRS13,PCD11,PPS12 1)Preventresidualhighvoltageattheterminalsof switchduringswitchoff/Suppressnoise. Highinvertedpoweroccursatswitch(PQR11)off, becauseofthe1stwindingoftransformer: (V=-L1xdi/dt.L1:LeakageInduction) Averyhighresidualvoltageexistonbothterminals ofPICF14,5~8pinbecausedtisaveryshort. 2)SNUBBERcircuitprotectsPQR11fromdamage throughleakagevoltagesuppressionbyRC, (ChargestheleakagevoltagetoPDS11,PER13, PCD12anddischargestoPRS11,PRS12).

7-2-2 Circuit description [FLY-Back RCC(Ringing Choke Converter)] Control
(a) AC Power Rectification/Smoothing Terminal 1) PDS01, PDS02, PDS03, PDS04 : Convert AC power to DC(Full wave rectification). 2)PEF10:SmooththevoltageconvertedtoDC. 3)PCD01,PCD02,PBS01:Noiseremovalatpowerinput/output. 4)PVA1:SMPSprotectionatpowersurgeinput.

Fig. 7-2 (c)Drivingcircuit WhenVinsupplied,drivingcurrentIgoccursthrouhgthePICF1.BythisI1(=HfexIg) occursthrougthePICF1andtheVbisinductedtobasewindingcoilNB. By inducted Vb, Ib start flow and the VCC voltage of PQR11 is sustained stable. IbisconstantandI1increasesinProportiontotime.AfterconstanttimepassedIb becometoshortageandPICF1iscutOFF(S/WOFF).

Fig. 7-1

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Schematic Diagrams u Operationdescriptions 1)InternalOP-Amp'+'basepotentialofPICS2is2.5Vandexternal"-"inputpotentialis connectedwithPRS33andPRS34tomaintainVoutof4.4V. 2)Ifloadof4.4Vterminalincrease(orACinoutvoltagedecrease)andVoutdecreaseover4.4V, Then:PICS2"R"potentialdecreaseover2.5V-->PICS2A-KBASECurrentdecrease--> PICS2A-KCurrentdecrease-->PICS1DIODECurrentdecrease-->PICS1C-ECurrentdecrease--> PICS1C-EVoltageincrease ->PICS1F-BVoltageincrease-->OUTDUTYincreaseTRANSPrimaryCuttentIncrease--> TRANSPrimaryPowerincrease-->Voutincrease-->Voutmaintain4.4V -PRD31,PRD32:Reduce4.4Vovershoot. -PRS32,PCS32:PreventPICS2oscillation(forphasecorrection).

7-2-3 Internal Block Diagram
u InternalBlockDiagram

Fig. 7-3 Driving Circuit

(d)FeedbackControlCircuit

Fig. 7-5

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Schematic Diagrams

7-3 S.M.P.S (S.M.P.S PCB)

q PF2S
DC 180V

w PDS0~0
DC 110-350V

e PIC1
AC 100-240V

r PICS1
1. (8.3V) 2. (2.5V) 3. (1.8V) 4. (1.9V)

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7-5

Schematic Diagrams

7-4 Front Key (S.M.P.S PCB)

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Schematic Diagrams

7-5 Video (Main PCB)

Power

Video

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Schematic Diagrams

7-6 Audio (Main PCB)

Audio

q DATA0 Waveform
IC5 Pin(1,7), Q505

u These are the waveforms of DVD-P181K.

Caution There can be some differences (Voltage, Frequency, stc.) among cameras.

7-8

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Schematic Diagrams

7-7 Memory (Main PCB)
Power

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Schematic Diagrams

7-8 Decoder (Main PCB)

Video

q IC2 Pin(21), IC3 Pin(17,18)

r SPD Waveform IC2 Pin(20), IC3(11,12,28)

w FE Waveform
IC3 Pin(13,14)

t OPEN, CLOSE WAVEFORM
IC2 Pin(23,25), IC3(9,10)

e IC2 Pin(125,126), IC3 Pin(15,16)

y CVBS Waveform IC2 Pin(9,90,95,100,101)

u These are the waveforms of DVD-P181K.
7-0 This Document can not be used without Samsung's authorization

Caution There can be some differences (Voltage, Frequency, stc.) among cameras. Samsung Electronics

Schematic Diagrams

7-9 Power (Main PCB)

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Schematic Diagrams

7-10 Connector (Power Key PCB)
Power

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Schematic Diagrams

7-11 Power Key (Power Key PCB)

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Schematic Diagrams

7-12 Scart (Scart PCB)

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Schematic Diagrams

7-13 Scart Connector (Scart PCB)

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7-15

Schematic Diagrams

7-14 Karaoke (Karaoke PCB)

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