Toshiba TLP510E 기술 교육 매뉴얼 - 페이지 30

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Toshiba TLP510E에 대해서도 마찬가지입니다: 서비스 매뉴얼 (33 페이지)

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7-2. Input Signal Switch Section

The signal SW section works as a circuit to supply the

signal to the signal process section in the next stage and

each output terminal by switching the signal entered

(video, audio).

Each input signal is sent to QV001 (CXA1855Q) as

shown in Fig. 7-2-1. The IC control is carried out by I

bus.

7-2-1. Video Signal

The composite video signal enters pins 43 (V1) and 45

(Y1) at the same time. When the composite signal

entered is a NTSC/PAL color signal, pin 43 (V1) is

selected. When it is either a SECAM or Black & White

signal and when the input switching is carried out, pin

45 (Y1) is selected.

This is because the composite signal is supplied to the

video/color process IC in the next stage passing through

the Y/C separation IC QV002 (TC9090AN) when the

composite signal is either SECAM or black & white

signal and when the input switching is carried out.

This is also because in the Y/C separation IC QV002

(TC9090AN), the SECAM signal cannot be separated

into Y and C signals, and it is not necessary for the Black

& White signal to be separated in Y and C signals.

The signal developed from pin 34 is Y/C-separated by Y/

C separation IC QV002 (TC9090AN) and then enters the

signal SW IC QV001 (CXA1855Q) again. (Pin 31 (Y),

pin 29 (C))

The Y/C signals entered from S terminal enter pins 3 and

5 respectively.

CXA1855Q

VIDEO

LV1

VIDEO

AUDIO

RV1

S1/S2

CAMERA

LEV

RGB

AUDIO

REV

Fig. 7-2-1

In case of TLP511, the video signal from the camera

section is supplied as Y/C signals and enters pins 9 and

11 respectively.

The video signal selected finally develops from pins 37

(Y) and 29 (C) respectively.

7-2-2. Audio Signal

The audio signal employs two input systems; one is for

video signal and the other is for RGB signals. Each

system is applicable to L and R stereo inputs respec-

tively.

The audio signal for the video signal is selected when

the video signal is selected and the audio signal for RGB

signals is selected when the RGB signals are selected.

The audio signal selected develops from pins 33 (L) and

32 (R).

7-2-3. RGB Signal

The RGB signals are entered using a high density D-SUB

15 and separated in two systems for the internal signal

process and the external output signal. The external

output signal develops at PV002 (RGB output connec-

tor) via QB007 (6 dB amp.). When the power turns on,

the RGB output signals always develop if any signal

enters at the RGB input terminal.

On the other hand, the internal process signals for the

RGB signals enter QB004, QB005 and QB006, respec-

tively. The input signal switch IC controls to mute the

RGB input signals when selecting the video input.

QV001

QV002

TC9090AN

V OUT 1

COMB

Y IN 1

FILTER

C IN 1

Y OUT 1

QV005

TDA9141

C OUT 1

L OUT 1

AUDIO

R OUT 1

SCL

Microprocessor

SDA

7-3