The PHILIPS 20C939 YEAR 1980 is a 20 inches color television with original remote control (SAF1039 IC).
It has 10 + 10 programs with VST SONG Tuning search system.
With this aim in view, the present invention provides a television tuning device comprising a circuit for continuously scanning at least one band of receivable frequencies, manual control means for starting and stopping the said scanning procedure, a terminal for applying a switch signal for switching from a first band-scanning speed to a second band-scanning speed lower than the first, and detection means for detecting the presence of a television channel by comparing the received sync signals with local signals generated in the television receiver, and applying a switch signal to the said terminal for switching from the said first scanning speed to the said second scanning speed in the presence of the said switch signal, so that the band scanning continues at said lower speed until the control means produce the stopping scanning procedure when a station is found.
The tuning search is performed in the "PHILIPS" marked box you can see in the picture above and it has the rising vertical colored bar showing band exploration during tuning search. The tuning is automatically stopped if broadband signal found and stored on an actual program position.
T
The set is build with a Modular chassis design because as modern television receivers become more complex the problem of repairing the receiver becomes more difficult. As the number of components used in the television receiver increases the susceptibility to breakdown increases and it becomes more difficult to replace defective components as they are more closely spaced. The problem has become even more complicated with the increasing number of color television receivers in use. A color television receiver has a larger number of circuits of a higher degree of complexity than the black and white receiver and further a more highly trained serviceman is required to properly service the color television receiver.
Fortunately for the service problem to date, most failures occur in the vacuum tubes used in the television receivers. A faulty or inoperative vacuum tube is relatively easy to find and replace. However, where the television receiver malfunction is caused by the failure of other components, such as resistors, capacitors or inductors, it is harder to isolate the defective component and a higher degree of skill on the part of the serviceman is required.
Even with the great majority of the color television receiver malfunctions being of the "easy to find and repair" type proper servicing of color sets has been difficult to obtain due to the shortage of trained serviceman.
At the present time advances in the state of the semiconductor art have led to the increasing use of transistors in color television receivers. The receiver described in this application has only two tubes, the picture tube and the high voltage rectifier tube, all the other active components in the receiver being semiconductors.
One important characteristic of a semiconductor device is its extreme reliability in comparison with the vacuum tube. The number of transistor and integrated circuit failures in the television receiver will be very low in comparison with the failures of other components, the reverse of what is true in present day color television receivers. Thus most failures in future television receivers will be of the hard to service type and will require more highly qualified servicemen.
The primary symptoms of a television receiver malfunction are shown on the picture tube of the television receiver while the components causing the malfunction are located within the cabinet. Also many adjustments to the receiver require the serviceman to observe the screen. Thus the serviceman must use unsatisfactory mirror arrangements to remove the electronic chassis from the cabinet, usually a very difficult task. Further many components are "buried" in a maze of circuitry and other components so that they are difficult to remove and replace without damage to other components in the receiver.
Repairing a modern color television receiver often requires that the receiver be removed from the home and carried to a repair shop where it may remain for many weeks. This is an expensive undertaking since most receivers are bulky and heavy enough to require at least two persons to carry them. Further, two trips must be made to the home, one to pick up the receiver and one to deliver it. For these reasons, the cost of maintaining the color television receiver in operating condition often exceeds the initial cost of the receiver and is an important factor in determining whether a receiver will be purchased.
Therefore, the object of this invention is to provide a transistorized color television receiver in which the main electronic chassis is easily accessible for maintenance and adjustment.
The Philips KT3 and K30 K35 chassis have been used in Pye and Philips colour sets from 1979-1980 to 1983. They are of modular construction, consisting of seven plug-in daughter boards units mounted on a main mother panel. The KT3 is designed to drive Philips 90° in -line gun tubes with screen sizes up to 20in. Its big screen sister, the K30, drives 110° 30AX tubes in 22 and 26in. screen sizes. Apart from this the two chassis are electrically very similar, the main differences being associated with the line output stage: the KT3 uses a line output transformer plus tripler powered from a 129V h.t. rail, whilst the K30 has a diode -split line output transformer and 140V h.t. rail. The modules are for the most part directly interchangeable, the exceptions being the chopper control and sound panels. There have been two versions of each chassis. The 1982 versions are known as "edition II". They incorporate slight changes in the mother panel and a completely redesigned decoder panel which is not interchangeable with the earlier panel. The new decoder panel has a single PHILIPS TDA3560 chip whilst the earlier panel uses a TDA2560Q and a TDA2523Q. In addition an improved power supply (chopper control) panel, type BY02, has been introduced. It's a direct replacement for the previous panels. To service a panel "in situ", a module extension board is required (part number 39537085). The KT3 and K30 chassis have proved to be extremely reliable, so there's only a limited fault history.
Koninklijke Philips Electronics N.V. (Royal Philips Electronics Inc.), most commonly known as Philips, (Euronext: PHIA, NYSE: PHG) is a multinational Dutch electronics corporation.
A comment...........of a 1996 reality ..................
Philips, which seems to be a perennial walking wounded case. The company had appeared to be on the mend after a worldwide cost- cutting programme which was started five years ago when Jan Timmer took over as chairman.
But, following a sharp profits fall, with the company's first quarterly loss since 1992, a further shake up is being undertaken.
The difficulty is that the company operates in a mature market, in which prices are falling at an annual rate of six per cent. Manufacturers are competing by cutting costs to gain a larger share of static demand. It's not a situation in which any firm that does its own manufacturing can achieve much. Philips' latest plan involves an overall loss of 6,000 jobs in its consumer electronics business, with far greater reliance placed on a group of external suppliers which are referred to as "a cluster of dedicated subcontractors".
This is an approach that was pioneered many years ago by major Japanese manufacturers. Rather than make everything yourself, you rely on subcontractors who, in return, rely on you for their main source of work. It is hardly a cosy arrangement: the whole point seems to be that the major fain can exert pressure on its subcontractors, thereby - in theory - achieving optimum efficiency and cost-effectiveness. What happens when lower and lower prices are demanded for subcontracted work is not made clear.
The whole edifice could collapse. However that might be, this is the course on which Philips has now embarked. The company is also to carry out distribution, sales and marketing on a regional rather than a national basis, and has said that it will not support Grundig's losses after this year.
But Philips' chief financial officer Dudley Eustace has said that it has "no intention of abandoning the television and audio business". One has to assume that the subcontracting will also be done on an international basis, as major Japanese firms have had to do. There is a sense of déjà vu about this, though one wishes Philips well - it is still one of the major contributors to research and development in our industry.
Toshiba, which has also just appointed a new top man, Taizo Nishimoro, provides an interesting contrast. Mr Nishimoro thinks that the western emphasis on sales and marketing rather than engineering is the way to go. So the whole industry seems to be moving full circle. Taizo Nishimoro has become the first non engineering president of Toshiba. Where the company cannot compete effectively on its own, he intends to seek international alliances or go for closures. He put it as follows. "The technology and the businesses we are engaged in are getting more complex.
In these circumstances, if we try to do everything ourselves we are making a mistake." Here's how Minoru Makihara, who became head of Mitsubishi Corporation four years ago, sees it. "Technologies are now moving so fast that it is impossible for the top manager to know all the details.
Companies are now looking for generalists who can understand broad changes, delegate and provide leadership." Corporate change indeed amongst our oriental colleagues. Major firms the world over are facing similar problems and having to adopt similar policies.
In a mature market such as consumer electronics, you have to rely on marketing to squeeze the last little bit of advantage from such developments as Dolby sound and other added value features. The consumer electronics industry has been hoping that the digital video disc would come to its aid and get sales and profits moving ahead.The DVD was due to be released in Sept 1996 , but we are unlikely to hear much more about it yet awhile. There's no problem with the technology: the difficulty is with licensing and software. There is obviously no point in launching it without adequate software support. But the movie companies, which control most of the required supply of software, are concerned that a recordable version of the disc, due in a couple of years' time, would be a gift to pirates worldwide. Concessions have been made by the electronics industry, in particular that different disc formats should be used in different parts of the world. But a curious problem has arisen.
The other main use of the DVD is as a ROM in computer systems. For this application flexible copying facilities are a major requirement. But the movie companies are unwilling to agree to this. At present the situation is deadlocked and the great hope of an autumn launch, all important for sales, has had to be postponed. Next year maybe? It's a great pity, since the DVD has much to offer.
There's a lot of sad news on the retail side as well. Colorvision has been placed in administrative receivership in 1996 , with a threat to 800 jobs at its 76 stores, while the Rumbelows shops that were taken over by computer retailer Escom have suffered a similar fate. The receivers have closed down the UK chain with the loss of 850 jobs at some 150 stores. Nothing seems to be going right just now.
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I.J. Blanken: Under German rule. Zaltbommel, European Library, 1999. (Vol. 4 of The history of Philips Electronics N.V). ISBN 90-288-1440-XReferences
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