Service manual SC-150

Pin No.

Pin Name

Type

Short description

59

ANA_IN1-

In

IF common

60

NC

 

Not Connected

61

TESTEN

In

Test pin

62

XTAL_IN

In

Crystal oscillator

63

XTAL_OUT

Out

Crystal oscillator

64

NC

 

Test pin

4-3 TDA 4470-Multistandard Video-IF and Quasi Parallel Sound Processor

4-3-1- Description

The TDA 4470 is an integrated bipolar circuit for multi-standard video/sound IF (VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processes all TV video IF signals with negative modulation (e.g., B/G standard), positive modulation (e.g., L standard) and the AM, FM/NICAM sound IF signals.

4-3-2-Features

-5V supply voltage ; low power consumption.

-Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true synchronous demodulation.

-Very linear video demodulation, good pulse response and excellent intermodulation figures.

-Alignment-free AFC without external reference circuit, polarity of the AFC curve is switchable.

-VIF-AGC for negative modulated signals (peak sync. detection) and for positive modulation

(peak white/black level detector).

-Tuner AGC with adjustable take over point.

-Alignment-free quasi parallel sound (QPS) mixer for FM/NICAM sound IF signals.

-Intercarrier output signal is gain controlled (necessary for digital sound processing).

-Complete alignment-free AM demodulator with gain controlled AF output.

-Separate SIF-AGC with average detection

-Two independent SIF inputs

-Parallel operation of the AM demodulator and QPS mixer (for NICAM-L stereo sound).

4-3-3- Pinning

Pin

Symbol

Function

1,2

Vi,SIF1

SIF1 input ( symmetrical)

3

VSW

Input selector switch

4,9,16

GND

Ground

5

VAGC

SIF-AGC (time constant)

6,7

Vi,VIF

VIF input (symmetrical)

8

CAGC

VIF-AGC (time constant)

10

RTOP

Take Over Point, tuner AGC

11

Itun

Tuner AGC output current

12

VO,VID

Video output

13

VSW

Standard switch

14

VSW

L’switch

15

Cbl

Black level capacitor

17

Cref

Internal reference voltage

18

LF

Loop Filter

-28-

Page 29
Image 29
Daewoo DSC-3220E/3220L service manual ANAIN1, Testen, Xtalin, Xtalout, Features

DSC-3220E/3220L specifications

The Daewoo DSC-3220E/3220L is a noteworthy addition to the lineup of high-efficiency air conditioning solutions, specifically crafted to meet the demands of varying climatic conditions. With a blend of innovative technologies and robust design, these models stand out in the realm of home and commercial air conditioning.

One of the main features of the DSC-3220E/3220L is its efficient cooling performance. The units are built with advanced rotary compressors, which are designed to operate efficiently while providing powerful cooling capabilities. This allows for quick temperature adjustments, making it an ideal choice for those who seek rapid relief from heat.

Another remarkable aspect of the DSC-3220E/3220L is its energy-efficient operation. With a superior Energy Efficiency Ratio (EER), these air conditioning units ensure that energy consumption is minimized without compromising comfort. This not only reduces electricity bills but also contributes to a smaller carbon footprint, making it an environmentally friendly choice.

The units also come equipped with state-of-the-art air filtration technologies. The multi-layer air filters are designed to capture dust, pollen, and other airborne particles, ensuring that the air in the environment remains clean and healthy. This feature is particularly beneficial for allergy sufferers and enhances the overall indoor air quality.

In terms of user convenience, the DSC-3220E/3220L models are engineered with user-friendly controls. Many features, including temperature settings and fan speeds, can be easily adjusted through a remote control or a digital display panel on the unit itself. This ensures that users can customize their comfort levels with minimal effort.

Noise reduction is another critical characteristic of the DSC-3220E/3220L. Both models are designed with silent operation in mind, making them suitable for bedrooms, offices, and other environments where noise can be a distraction. The sound insulation techniques employed help maintain a serene atmosphere while enjoying optimal cooling.

Furthermore, installation of the DSC-3220E/3220L air conditioning systems is straightforward, making them accessible for residential and commercial settings alike. The compact design and versatility in installation options allow these units to fit seamlessly into various spaces without sacrificing performance.

Overall, the Daewoo DSC-3220E/3220L embodies a fine balance of efficiency, technology, and user-centric design, making it a commendable choice for air conditioning needs in diverse settings. With its reliable performance and thoughtful features, it continues to gain popularity among consumers looking for effective climate solutions.