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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, 1/8W unless otherwise noted.
7-3 S.M.P.S (S.M.P.S 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 Video (Main PCB) -----------------------------------------------------------------------------------------7-6
Note :
7-5 Audio (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 Decoder (Main PCB) -------------------------------------------------------------------------------------7-8
Important safety notices :
7-7 Scart (Scart 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.
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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) (b) SNUBBER Circuit :
PDS11, PCD12, PRS13, PCD11, PPS12
w Terms
1) 1st : Common power input to 1st winding.
1) Prevent residual high voltage at the terminals of
2) 2nd : Circuit followings output winding of transformer.
switch during switch off/Suppress noise.
3) f (Frequency) : Switching frequency (T : Switching cycle)
High inverted power occurs at switch (PQR11) off,
4) Duty : (Ton/T) x 100
because of the 1st winding of transformer :
(V=-L1 xdi/dt. L1 : Leakage Induction)
7-2-2 Circuit description [FLY-Back RCC(Ringing Choke Converter)] Control A very high residual voltage exist on both terminals
of PICF1 4, 5~8pin because dt is a very short.
(a) AC Power Rectification/Smoothing Terminal
1) PDS01, PDS02, PDS03, PDS04 : Convert AC power to DC(Full wave rectification). 2) SNUBBER circuit protects PQR11 from damage
2) PEF10 : Smooth the voltage converted to DC. through leakage voltage suppression by RC,
3) PCD01, PCD02, PBS01 : Noise removal at power input/output. (Charges the leakage voltage to PDS11, PER13,
4) PVA1 : SMPS protection at power surge input. PCD12 and discharges to PRS11, PRS12).
Fig. 7-2
(c) Driving circuit
When Vin supplied, driving current Ig occurs throuhg the PICF1. By this I1 (=Hfe x Ig)
occurs throug the PICF1 and the Vb is inducted to base winding coil NB.
By inducted Vb, Ib start flow and the VCC voltage of PQR11 is sustained stable.
Ib is constant and I1 increases in Proportion to time. After constant time passed Ib
become to shortage and PICF1 is cut OFF (S/W OFF).
Fig. 7-1
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Schematic Diagrams
w Operation descriptions
1) Internal OP-Amp `+' base potential of PICS2 is 2.5V and external "-" input potential is
connected with PRS33 and PRS34 to maintain Vout of 4.4V.
2) If load of 4.4V terminal increase (or AC inout voltage decrease) and Vout decrease over 4.4V,
Then : PICS2 "R" potential decrease over 2.5V --> PICS2 A-K BASE Current decrease -->
PICS2 A-K Current decrease --> PICS1 DIODE Current decrease --> PICS1 C-E Current decrease -->
PICS1 C-E Voltage increase -
-> PICS1 F-B Voltage increase --> OUT DUTY increase TRANS Primary Cuttent Increase -->
TRANS Primary Power increase --> Vout increase --> Vout maintain 4.4V
- PRD31, PRD32 : Reduce 4.4V overshoot.
- PRS32, PCS32 : Prevent PICS2 oscillation (for phase correction).
7-2-3 Internal Block Diagram
w Internal Block Diagram
Fig. 7-3 Driving Circuit
(d) Feedback Control Circuit
Fig. 7-5
Fig. 7-4
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Schematic Diagrams
7-3 S.M.P.S (S.M.P.S PCB)
Power
q PTD1
1. (3.3V)
2. (5V)
3. (12V)
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Schematic Diagrams
7-4 Video (Main PCB)
Video Audio Power
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Schematic Diagrams
7-5 Audio (Main PCB)
Audio
q DATA0 Waveform
IC5 Pin1, 7
u These are the waveforms of DVD-C350.
Caution There can be some differences
(Voltage, Frequency, stc.) among cameras.
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Schematic Diagrams
7-6 Decoder (Main PCB)
Video Audio Power
Refer to a pattern image of Table 7-6
u These are the waveforms of DVD-C350.
Caution There can be some differences
(Voltage, Frequency, stc.) among cameras.
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Schematic Diagrams
q FE Waveform w MIC1 Pin 18 e IC3 Pin 15,16 r SPD Waveform
IC3 Pin 13,14 MIC1(Pin 17,123) IC3(Pin11,12,28)
t OPEN, CLOSE WAVEFORM y CVBS Waveform
MIC1(Pin12,41) IC3(Pin9,10) MIC1 Pin102, 103, 104
Fig. 7-6
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Schematic Diagrams
7-7 Scart (Scart PCB)
Video Audio Power
7-10 Samsung Electronics