Daewoo DUB-2850, Руководство по обслуживанию

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CP-780 Service Manual
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Tint control for external RGB/YPBPR signals
Scan Velocity Modulation output. The SVM circuit is active for all the incoming CVBS, Y/C
and RGB/YPBPR signals. The SVM function can also be used during the display of teletext
pages.
RGB control circuit with Continuous Cathode Calibration , white point and black level off-
set adjustment so that the colour temperature of the dark and the light parts of the screen
can be chosen independently.
Contrast reduction possibility during mixed-mode of OSD and Text signals
Adjustable wide blanking of the RGB outputs
Horizontal synchronization with two control loops and alignment-free horizontal oscillator
Vertical count-down circuit
Vertical driver optimized for DC-coupled vertical output stages
Horizontal and vertical geometry processing with horizontal parallelogram and bow
correction and horizontal and vertical zoom
Low-power start-up of the horizontal drive circuit
Analogue video processing (stereo versions)
The low-pass filtered mixed down I signal is available via a single ended or balanced
output stage.
Analogue video processing (mono versions)
The low-pass filtered mixed down I signal is available via a single ended output stage
Digital Video Processing (some versions)
Double Window mode applications. It is possible to display a video and a text window or 2
text windows in parallel.
Linear and non-linear horizontal scaling of the video signal to be displayed.
Sound Demodulation (all versions)
Separate SIF (Sound IF) input for single reference QSS (Quasi Split Sound) demodulation.
AM demodulator without extra reference circuit
The mono intercarrier sound circuit has a selective FM-PLL demodulator which can be
switched to the different FM sound frequencies (4.5/5.5/6.0/6.5 MHz). The quality of this
system is such that the external band-pass filters can be omitted. In the stereo versions of
UOCIII the use of this demodulator is optional for special applications. Normally the FM
demodulators of the stereo demodulator/decoder part are used (see below).
The FM-PLL demodulator can be set to centre frequencies of 4.72/5.74 MHz so that a
second sound channel can be demodulated. In such an application it is necessary that an
external bandpass filter is inserted.
The vision IF and mono intercarrier sound circuit can be used for the demodulation of FM
radio signals. With an external FM tuner also signals with an IF frequency of 10.7 MHz can
be demodulated.
Switch to select between 2nd SIF from QSS demodulation or external FM (SSIF)
Audio Interfaces and switching (stereo versions with Audio DSP)
Audio switch circuit with 4 stereo inputs, a stereo output for SCART/CINCH, 1 stereo output
for HEADPHONE. The headphone channel has an analogue volume control circuit for the L
and R channel. Finally 1 stereo SPEAKER output with digital controls.
AVL (Automatic Volume Levelling) circuit for the headphone channel.
Digital input crossbar switch for all digital signal sources and destinations