Daewoo DSC-3220E/3220L service manual Forced KEY

Page 55

Service manual SC-150

5-4-6 EXTERNAL source control logic

The following schematic, illustrates the logic of control for the two SCART connectors.

 

 

 

AV

KEY

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F/SW

 

 

 

 

 

LOW

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

ENABLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S/SW

 

2

LOW

FORCED

 

 

 

 

 

 

 

 

 

 

 

 

 

& S/SW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ENABLE

AV

FORCED

 

 

 

 

 

 

 

 

 

 

 

 

 

RF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F/SW 1

 

 

 

AV

 

 

 

 

 

 

 

 

 

 

KEY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KEY

 

 

 

 

 

 

 

 

 

 

 

AV 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AUTO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LOW

&

 

 

RF

 

 

 

 

 

 

 

 

FORCED

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F/SW

 

AV

S-VHS3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

LOW

S/SW 1

 

 

 

 

 

1

 

KEY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S/SW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S/SW

 

 

 

S/SW

 

 

 

 

 

 

 

 

 

 

HIGH

 

 

HIGH

 

 

HIGHS/SW

 

 

DISABLE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

AV

AV F/SW 1

 

 

 

 

 

 

 

 

 

 

 

 

F/SW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

KEY

KEY

 

 

 

 

 

AUTO

 

 

 

 

 

 

DISABLE

 

 

OPTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

AV 1

 

DISABLE

 

 

 

 

 

WP895

 

 

 

 

 

 

 

 

 

 

 

FORCED

 

KEY

 

 

 

 

 

 

F/SW

 

 

 

 

 

 

 

 

 

 

S/SW

 

1

 

 

 

 

AV3

 

 

 

 

 

 

 

 

 

 

 

 

 

AV

 

 

1

 

 

 

 

 

S/SW

1

LOW

 

 

AUTO

 

 

DISABLE

 

 

 

 

 

2 LOW &

 

 

 

 

 

 

 

F/SW

 

 

 

 

 

 

 

 

 

 

 

 

AV 2

AV

 

 

 

 

 

 

 

 

 

 

 

 

 

S/SW 1

 

 

 

 

AV

FORCED

 

 

 

 

 

 

ENABLE

 

 

 

 

KEY

 

 

 

 

 

 

 

 

HIGH

 

 

 

 

KEY

AV 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

F/SW

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AV KEY

FORCED

 

 

 

 

 

 

 

 

 

 

 

 

 

S-VHS2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The terms used in the schematic are described below ;

1.AUTO represents a situation where the television has self-selected its picture source. This could be when the SCART SLOW SWITCHING pin has gone to a high state, and the AV 1 input is selected without the intervention of the user.

2.FORCED represents the change of source which has been commanded by the user (using the EXTERNAL button). The user always has priority, and can override the AUTO change of source by the television.

3.AV KEY represents the EXTERNAL button of the remote control, or on the television.

4.S/SW 1, or S/SW 2 represent the SLOW SWITCHING inputs of the first SCART (AV 1) or second SCART (AV 2), these each being pin number 8.

5.F/SW 1 represents the FAST SWITCHING input of the first SCART (AV 1), on pin number 16. The second SCART, AV 2, input does not possess a FAST SWITCHING input.

The HIGH state of a slow switching input represents the request from the external source to be selected by the television. Whether this is accepted or not depends on the position in the logic diagram. The general rule is that the user always has priority, so the use of the AV KEY will always result in a defined logic path being followed.

Under certain circumstances, defined in the diagram, the change of state of a slow switching input will result in the automatic change of source by the television. This change, such as the change from RF broadcast to the AV 1 input,

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Contents Chassis SC-150 Contents General description Main PCB Union PCB Tuning system Main FeaturesPower consumption Sound Output PowerSvhs Pin Signal Description Matching value Page C04 C01C02 C03639.25 S13 S10S11 S12Special case Country selection = Others Program Group SkipITV RAY Radiation Precaution Safety instructionHOR Width Order Default settingh for SC-150Alignment instructions ParabolaOption HOR Paral BOW HOR Width Corner EW Trapez VCT IC descriptionPage Page Chassis IC marking OSD languages Atss countries Text IC version VCT 3832A VCT 3834APin Name Type Short Description Gndaf Supply AGC Page German 2-Carrier System Dual FM System DSP-Section Audio Baseband ProcessingAnalogue Section Nicam plus FM/AM-MonoAdrsel PALSECAM-L UssrVREF2 ResetqDvsup DvssXtalin FeaturesANAIN1 TestenPin Symbol Function Mode OUT1GND1 OUT1+TDA8946J Page GND Block diagram TDA6107Q SCL SDAPage TJ TSD Pin Name Symbol DescriptionVIN OVP IIN HDescription IC Pins Symbol Rating Unit I2C Decoder SW3 SW1SW0 SW2IN2 IN3OUT IN1VEE Circuit description If section Block diagram Vision if Amplifier FPLL, VCO and AFC Standard FeaturesPage Page Adaptive Comb Filter VCT3834A only Video Sync Processing CRT Measurement and Control Page Stand by ConfigurationDescription Application Forced KEY Page Quadrature Mixers ESCPage Page STR-F6654 general description Power supply primary part operationsPage STR-F6654 oscillating operation Overvoltage protection circuit OVP Overcurrent protection function OCPLatch circuit Thermal shutdown circuit TSDTV start-up operations TV normal run and stand-by mode operations Page FBT SC-150 Controlled Rectifier 6V DC High Service Parts List Cord Power Oxide Film 2W 1.2 OHM J Small Semi Fixed CCZB1H561K Cera Carbon Film Metal Film Carbon Comp PA01A RF27 RD-4Z221J Jumper Different Part List by PCB & Micom Version Main PCBUnion PCB Jumper DELExplode View PCB Main PCB Union Schematic DiagramMAIN Schematic DiagramUNION

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