CP-520/520A/520F Service Manual

available on one of the other CVBS inputs.In this condition the connections between the vision IF amplifier and the synchronisation circuit can be switched on and off by means of the VDX bit. The VDXEN bit must be set to “1” for this mode.

The vertical synchronisation is realised by means of a divider circuit.

5.2.7 Horizontal and vertical drive

The horizontal drive is switched on and off via the soft start/stop procedure. The soft start function is realised by means of variation of the TON of the horizontal drive pulses. During the soft-stop period the horizontal output frequency is doubled resulting in a reduction of the EHT so that the picture tube capacitance can easily be discharged. In addition the horizontal drive circuit has a ‘low-power start-up’ function.

The vertical ramp generator needs an external resistor and capacitor. For the vertical drive a differential output current is available. The outputs must be DC coupled to the vertical output stage.

The IC has the following geometry control functions:

nVertical amplitude

nVertical slope

nS-correction

nVertical shift

nVertical zoom

nVertical scroll

nVertical linearity correction. When required the linearity setting for the upper and lower part of the screen can have a different setting.

nHorizontal shift

nEW width

nEW parabola width

nEW upper and lower corner parabola correction

nEW trapezium correction

nHorizontal parallelogram and bow correction.

When the East-West geometry function is not required (e.g. for 90 picture tubes) the EW output pin can be used for the connection of the AVL capacitor. This function is chosen by means of the AVLE bit.

5.2.8 Chroma, luminance and feature processing

Someversionscontaina4H/2H(2D)adaptivePAL/NTSC comb filter. The comb filter is automatically activated when standard CVBS signals are received.A signal is considered as “standard signal” when a PAL or NTSC signal is identified and when the vertical divider is in the modes ‘standard narrow window’ or ‘standard TV norm’.For non-standard signals and for SECAM signals the comb filter is bypassed and the signal is filtered by means of bandpass and trap filters.

The chroma band-pass and trap circuits (including the SECAM cloche filter) are realised by means of internal filters and are tuned to the right frequency by comparing the tuning frequency with the reference frequency of the colour decoder.

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Daewoo DTC-21Y1/21Y2, DTZ-29U7/U3, DTZ-2881/28W8, DTY-21U7/21B4, DTC-20T2, DTY-25G6/25G7 Horizontal and vertical drive
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DTZ-2481, DTZ-29U7/U3, DTC-21Y1/21Y2, DTY-21U7/21B4, DTY-2880/28W5 specifications

The Daewoo DTC-20T2, DTY-28A8, DTY-28A6, DTY-28A7, DTZ-2881/28W8, DTY-25G6/25G7, and DTY-2880/28W5 represent a range of innovative and feature-rich vehicles that reflect Daewoo's commitment to quality and advanced technology. Each model combines sleek design with performance excellence, appealing to a wide range of consumers.

Starting with the DTC-20T2, this compact car offers a combination of efficiency and agility. Its lightweight design enhances fuel economy while maintaining stability on the road. Equipped with a state-of-the-art engine, the DTC-20T2 delivers a responsive drive, making it ideal for city commuting and weekend getaways.

The DTY-28A8 is known for its spacious interior and comfort features. It boasts advanced infotainment systems, including touch screens and smartphone connectivity, catering to modern drivers. Safety is paramount, with multiple airbags and advanced braking systems ensuring peace of mind on every journey.

Similarly, the DTY-28A6 and DTY-28A7 share many design elements but have unique enhancements that differentiate them. They incorporate advanced suspension systems that provide a smooth driving experience while navigating urban and rural landscapes. These models also feature high-efficiency engines that strike a balance between power and fuel consumption.

Moving to the DTZ-2881/28W8, this vehicle makes a statement with its bold design and robust performance. This model is designed with aerodynamics in mind, reducing drag and enhancing fuel efficiency. It includes innovative technologies like regenerative braking, which captures energy during deceleration, extending the vehicle's overall efficiency.

The DTY-25G6/25G7 and DTY-2880/28W5 are particularly impressive with their emphasis on versatility. These models offer various configurations and layouts to cater to different needs, whether for families or individuals. They feature expanded cargo capacity and modular seating arrangements that can accommodate both passenger and transportation requirements.

In conclusion, the Daewoo DTC-20T2, DTY-28A8, DTY-28A6, DTY-28A7, DTZ-2881/28W8, DTY-25G6/25G7, and DTY-2880/28W5 showcase a blend of performance, technology, and comfort across their varying models. From advanced safety features to innovative fuel efficiency technologies, these vehicles are tailored to meet the needs of a diverse clientele, reinforcing Daewoo’s stature in the automotive industry.
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