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