Service manual SC-150

5-4-3 - Controller I/O pin configuration and function

There exist different kinds of ports. The universal ports serve as digital I/O and have additional special input and output functions. A subset of the universal ports serves as input for the analogue-to-digital converter.

- Controller I/O pin configuration and function table

pin

name

configuration

description

Stand by

TV ON

 

 

 

1

Power

Push Pull Low

Push Pull High

Switch OFF / ON SMPS

2

AGC

High impedance

High impedance

Tuner AGC level input –

 

 

 

 

For factory use only

5

Mod SW

High impedance

Push Pull

High = Negative

 

 

 

 

modulation, Low = Positive

 

 

 

 

modulation (L/L’).

 

 

 

 

 

6

SECAM L’

High impedance

Push Pull

Low = L, High =L’

7

AFC

High impedance

High impedance

ADC input

8

IR

High impedance

High impedance

Interrupt input

9

SC1 SW

High impedance

High impedance

SCART 1 slow switching –

 

 

 

 

ADC input

10

SC2 SW

High impedance

High impedance

SCART 2 slow switching –

 

 

 

 

ADC input

 

 

 

 

 

61

Mute

Push Pull

Push Pull

High = Mute active

62

LED

Open Drain

Open Drain

 

63

KB

High impedance

High impedance

Keyboard input – ADC

 

 

 

 

input

 

 

 

 

 

64

OCP

High impedance

High impedance

Over Current Protection –

 

 

 

 

Switch the set to Std by if < 2.

To reduce power consumption in stand by mode all ports not used are configured in high impedance mode.

5-4-4 Tuning

The AFC information is supplied by the demodulator IC, and becomes available on VCT pin 7 for controlling software. The controlling software uses this information for tuner frequency tracking ( automatic following ). The AFC window is typically between 50 KHz and 100 KHz.

The minimum frequency step of the tuner is 50 Khz.

This AFC function is disabled when a program is tuned using the direct frequency entry or after fine tuning adjustment. Therefore it is recommended to tune channel with the TV search function ( manual or ATSS ) or using the direct channel entry to enable the Automatic Frequency Control.

5-4-5 Automatic Format switching and WSS

When AUTO mode is selected by the user, the television will automatically select a mode for the user. The format information is supplied by SCART pin 8 level when in AV mode or by WSS data. The signal contains codes as defined in the WSS European Telecommunication Standard, ETS 300 294. Briefly, the signal is received at the beginning of line

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Daewoo DSC-3220E/3220L service manual Configuration, Stand by
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DSC-3220E/3220L specifications

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