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7. Schematic Diagrams
7-1 All block Diagram ----------------------------------------------------------------------------------------7-2 Note
For schematic Diagram
7-2 Power ------------------------------------------------------------------------------------------------------------7-3 - Resistors are in ohms, /8W unless otherwise noted.
7-3 S.M.P.S (VCR Main PCB) ------------------------------------------------------------------------------7-5 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.
7-4 Power (VCR Main PCB) --------------------------------------------------------------------------------7-6
Note :
7-5 S.M.P.S (DVD Main PCB) ------------------------------------------------------------------------------7-7 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).
7-6 SYSCON / SERVO (VCR Main PCB) --------------------------------------------------------------7-8
Important safety notices :
7-7 A/V (VCR Main PCB) ----------------------------------------------------------------------------------7-10 Components identified with the mark have the special characteristics for safety. When replacing any of these
components. Use only the same type.
7-8 Hi-Fi (VCR Main PCB) ---------------------------------------------------------------------------------7-12
7-9 OSD, VPS/PDC (VCR Main PCB) ----------------------------------------------------------------7-13
7-10 TM Block (VCR Main PCB) ------------------------------------------------------------------------7-14
7-11 SECAM (VCR Main PCB) ---------------------------------------------------------------------------7-15
7-12 A2 / NICAM (VCR Main PCB) -------------------------------------------------------------------7-16
7-13 Audio (DVD Main PCB) -----------------------------------------------------------------------------7-17
7-14 Video (DVD Main PCB) -----------------------------------------------------------------------------7-18
7-15 Decoder (DVD Main PCB) ------------------------------------------------------------------------7-19
7-16 Motor Driver (DVD Main PCB) -----------------------------------------------------------------7-20
7-17 Front / Timer (VCR Main PCB) -----------------------------------------------------------------7-21
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Schematic Diagrams
7-1 All block Diagram
A/V Common
DECK ASS'Y
AUDIO R
AUDIO R
AUDIO L
AUDIO L
Coaxial
VIDEO
(RGB,CVBS)
Y Pb Pr SCART JACK
G B R
CVBS
Pick-up & I/V Amp
CVBS IC802
Disk Motor Sled Motor (BU4053) AUDIO L/R IC501
Output Signal Switch (LA72646)
Hi-FI Audio Processor
MDIC1
AUDIO L/R
(AM5766)
Motor Driver
IC301
(LA71750EM)
Video Signal Processor
ZIC1 DIC5 64MB SD RAM
ZORAN
ZR36966
DIC7 IC601
(TC74VHCT125) (UPD78F4928) IC605 EEPROM
Level Shifter VCR Main Micom
IC701
ZIC3
(PT6961)
(MX25L1605A)
LED Drive
IMB Flash Memory
Front A/V Jack
STEREO
(DT701)
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Schematic Diagrams
7-2 Power
7-2-1 About S.M.P.S (Ringing Choke Converter Method)
wSNUBBERCircuit:
PDS11,PCD12,PRS13,PCD11,PPS12
q Terms
1)1st:Commonpowerinputto1stwinding.
1)Preventresidualhighvoltageattheterminalsof
2)2nd:Circuitfollowingsoutputwindingoftransformer.
switchduringswitchoff/Suppressnoise.
3)f(Frequency):Switchingfrequency(T:Switchingcycle)
Highinvertedpoweroccursatswitch(PQR11)off,
4)Duty:(Ton/T)x100
becauseofthe1stwindingoftransformer:
(V=-L1xdi/dt.L1:LeakageInduction)
7-2-2 Circuit description [FLY-Back RCC(Ringing Choke Converter)] Control Averyhighresidualvoltageexistonbothterminals
ofPICF14,5~8pinbecausedtisaveryshort.
q AC Power Rectification/Smoothing Terminal
1) PDS01, PDS02, PDS03, PDS04 : Convert AC power to DC(Full wave rectification). 2)SNUBBERcircuitprotectsPQR11fromdamage
2)PEF10:SmooththevoltageconvertedtoDC. throughleakagevoltagesuppressionbyRC,
3)PCD01,PCD02,PBS01:Noiseremovalatpowerinput/output. (ChargestheleakagevoltagetoPDS11,PER13,
4)PVA1:SMPSprotectionatpowersurgeinput. PCD12anddischargestoPRS11,PRS12).
Fig. 7-2
eDrivingcircuit
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
q 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
q InternalBlockDiagram
Fig. 7-3 Driving Circuit
rFeedbackControlCircuit
Fig. 7-5
Fig. 7-4
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Schematic Diagrams
7-3 S.M.P.S (VCR Main PCB)
Power
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Schematic Diagrams
7-4 Power (VCR Main PCB)
Power
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Schematic Diagrams
7-5 S.M.P.S (DVD Main PCB)
Video Audio Power
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Schematic Diagrams
7-6 SYSCON / SERVO (VCR Main PCB)
Video Power
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Schematic Diagrams
q XT0 8MHz w IC601 8,24,75Pin e IC601 Pin 98 r IC601 Pin 99 t IC601 Pin 6, 7
u These are the waveforms of DVD-V6800
Caution) There can be some differences (Voltage, Frequency, stc.) among cameras.
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Schematic Diagrams
7-7 A/V (VCR Main PCB)
Video Audio Power
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Schematic Diagrams
q IC301 Pin 61, 68, 69 w IC301 Pin 48 e IC301 Pin 48 r IC301 Pin 70, 65 t IC301 Pin 25 y IC301 Pin 12 u IC301 Pin 15
u These are the waveforms of DVD-V6800
Caution) There can be some differences (Voltage, Frequency, stc.) among cameras.
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Schematic Diagrams
7-8 Hi-Fi (VCR Main PCB)
Audio Power
u These are the waveforms of DVD-V6800
Caution) There can be some differences
(Voltage, Frequency, stc.) among cameras.
q IC501 6Pin w IC501 78, 80Pin
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Schematic Diagrams
7-9 OSD, VPS/PDC (VCR Main PCB)
Video Power
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Schematic Diagrams
7-10 TM Block (VCR Main PCB)
Power
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Schematic Diagrams
7-11 SECAM (VCR Main PCB)
Video Power
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Schematic Diagrams
7-12 A2 / NICAM (VCR Main PCB)
Power
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Schematic Diagrams
7-13 Audio (DVD Main PCB)
Audio Power
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Schematic Diagrams
7-14 Video (DVD Main PCB)
Video Audio
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Schematic Diagrams
7-15 Decoder (DVD Main PCB)
Video Audio Power
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Schematic Diagrams
7-16 Motor Driver (DVD Main PCB)
Power
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Schematic Diagrams
7-17 Front / Timer (VCR Main PCB)
Video Audio Power
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Schematic Diagrams
MEMO
7- Samsung Electronics