In this issue, the "lion's share" was reserved for color television. It deals with the supply of circuits in extenso because it presented new notions in 1983 compared to black and white TV: power supply, chrominance and kinescope.
The beginnings of color TV manufacturing in Romania
The color TV that was to be manufactured at Electronica in 1983 consumes less than 100W from the mains and operate freely at mains voltages between 150V and 250V. In this way, the design ensures that an essential task for the national economy and for the remote owner is achieved: energy saving.
Consumption of approx. 80W a color TV with a 56 cm screen was a reality in 1983; in 1979 this was a hope, a desideratum and because this desideratum was of major importance it was given a wider space than it seemed necessary.
In short, compared to a 1983 TV-AN, a Secam color TV requires 4 new integrated circuits for that time: TCA640, TCA650, TCA660, TBA530.
A standard PAL-SECAM TV requires only an extra IC: TBA540, which for the technical capacity of IPRS since 1983, did not constitute any difficulty. Therefore, a standard PAL-SECAM chrominance module is outlined, containing CI TCA 640, TCA650, TBA540 and two color channel modules common to both systems:
- Luminance amplifier with TCA660 (Y mode);
- Matrix and final R, G, B with TBA530 (RGB mode).
HEAD. 1. 4 CI TVs
1.1. Some TV defects with 4 ICs
1.2. Troubleshooting functional modules
1.3. More common module defects
HEAD. 2. THE PRACTICE OF TV with CI troubleshooting
HEAD. 3. COLOR TV POWER SUPPLY
3.1. Switching power supply and series storage inductor
3.2. Self-locking converter as power supply for color TV
- Self-locking converter as voltage stabilizer
- Self-locking converter with BO series power supply
- The chopper principle CESSY
HEAD. 4. VOLTAGE RECTIFIER AND MULTIPLICATORS
4.1. Monoalternating recovery with resistive load
4.2. Monoalternating recovery with filtering capacity
4.3. Recovery of both alternates
4.4. Voltage recovery
4.5. Voltage multiplication for FIT
- FIT rectification with voltage doubling
- Tension triplet for color TV
4.6. Voltage triplet DIODE-SPLIT
4.7. Line pulse recovery
CHAPTER.5. COLOR TV OPTIONS
5.1. NTSC? SECAM? pal
5.2. TCA 600 series
- Chrominance amplifier
- The chrominance demodulator
- Luminance amplifier
- RGB matrix
5.3.Module adjustment bench
Thanks too Mr. Adrian Dobrescu for completing the collection of Electronica Bucharest technical bulletins, with this book.
Author: Ing. Statnic Eugen
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