Schematic diagram of the TV set electronics 409 d. "Electronics and Radio Engineering" to the home master! Specifying Security Measures
The television receiver of the black-and-white image "Electronics-409 / D" since 1988 has been producing the Khmelnytsky plant "Cation". "Electronics-409 / D" - a small-sized semiconductor TV using integrated circuits. The model uses a 16LK8B kinescope with a screen size of 16 cm diagonal and an electron beam deflection angle of 70°. The TV provides reception of television programs on any of the 12 channels of the MV range, and the TV with the index "D" and on any of the 40 channels of the UHF range; listening to the soundtrack on the headphones, with the speakers turned on. Effective AGC ensures a stable image. The model consists of several functional units placed in a plastic case. Printed mounting is made on 3 rotary boards. The TV is electronically tuned to the received channel with the "Tuning" knob located on the front of the TV. Image size 98x120 mm. The sensitivity of the model is in the range of MV - 40, UHF - 70 μV. Resolution 400 lines. Rated output power 0.15 W. Power consumption from a network of 17 W, from a source of 12 V. 8 W. TV dimensions 178x160x525. Weight 3.15 kg. Since 1990, the Khmelnytsky plant "Kation" and the Rakhovsky plant "Condenser" based on the TV produced the video control device "Electronics-409 VKU" designed to work with the video camera "Electronics L-50".
Instruction manual for TV "Electronics-409/D". Operation manual "Electronics-409 VKU". Photo TV Valery Kruchina, Kharkiv.
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Portable transistor TV "Electronics 409-409D"
MANUAL
ATTENTION!
When buying a TV, demand to check its performance by demonstrating the quality of the picture and sound.
Make sure that the warranty and tear-off coupons for the TV and kinescope are stamped by the store, legible signature or stamp of the seller and the date of sale.
Remember that if you lose the warranty (tear-off) coupon for maintenance, you lose the right to warranty repairs. Check the integrity of the seals on the TV and its completeness.
The installation and maintenance of the TV should be carried out by a specialist repair company serving your area. Repair of TVs is carried out only in stationary workshops.
Before turning on the TV, carefully read this user manual, the controls and the inscriptions on the back of the casing and the control panel of the TV.
When a bright stripe or spot appears, in order to avoid burning through the kinescope. turn off the TV immediately and contact a repair shop. Do not leave the TV unattended while it is on.
Completeness
1. TV - 1 pc.
2. Operation manual with warranty and tear-off coupons for the TV - 1 pc.
3. Passport (label) with a warranty card for a kinescope - 1 pc.
4. Individual packaging - 1 pc.
5. Cord for powering the TV from AC mains voltage 220 V - 1 pc.
6. Cord for powering the TV from the car battery through the cigarette lighter socket - 1 pc.
8. UHF frame antenna (in the TV "Electronics 409D") - 1 pc.
Fusible insert VPTb-2-025 - 3 pcs.
CAT-Shch plug for connecting an external antenna cable - 1 pc.
Specifying Security Measures
Be careful! A working TV has a life-threatening high voltage (8-9 kV).
To avoid accidents, it is strictly forbidden to turn on the TV with the cover removed.
Before replacing the fuse (fusible insert) in the TV, do not forget to remove the plug from the power outlet.
Do not use homemade fusible inserts. This may damage the TV.
Particular care should be taken when handling the kinescope:
a) protect the kinescope from bumps and scratches;
6) transport and store the kinescope in a packaged form;
c) the replacement of the kinescope must be carried out by a specialist of the repair company.
If you use an outdoor antenna, then when a thunderstorm approaches, stop receiving and disconnect the antenna from the TV.
Fire safety memo
When using the TV:
1. Use only standard fusible inserts, the rating of which is provided for in the instruction manual.
2. Do not install the TV in close proximity to flammable and fire-propagating objects; do not install the TV near heating appliances where it does not cool well. Do not block the ventilation holes on the back wall and on the bottom of the TV.
3. The socket for connecting the TV's power plug must be in an accessible place to quickly disconnect the TV from the mains.
4. Do not allow the TV to be powered from a high voltage mains.
5. Do not leave the TV turned on unattended, do not allow children to watch television programs in the absence of adults. Always turn off the TV when you leave the room. Provide conditions that exclude the possibility of young children turning on the TV on their own.
6. Unplug the power cord from the outlet if the TV is left unused for a long time.
7. If the controls are damaged or the TV is malfunctioning (no picture, buzzing, burning smell, etc.), unplug the TV immediately and call a repair company.
8. In the event of a malfunction in the TV, do not turn on the TV again.
9. Do not entrust TV repair to random people.
10. After the end of the warranty period, at least once a year, it is recommended to call a repair company specialist for preventive inspection of the TV and clean it from dust and dirt. The work is carried out at the expense of the owner of the TV in the time agreed with the repair company.
REMEMBER! Neglecting one of the above rules can lead to overheating of the TV, its failure and even to its fire.
If the TV catches fire, unplug the TV's power cord from the wall outlet immediately. If the burning has not stopped, then fill the TV with water through the holes in the back wall, (being on the side of the TV) cover it with a thick cloth, blanket or other object so as to stop air from entering the TV case.
To avoid poisoning by combustion products, immediately remove from the room all people who are not involved in the elimination of fire and, first of all, children.
Report the fire to the fire department.
After extinguishing the fire, call a specialist repair company serving your area.
Brief description of the TV
General information
"Electronics 409" and "Electronics 409D" - small-sized semiconductor TVs using integrated circuits.
The TV is available in 2 versions:
1) with a decimeter channel selector SK-D-30-1S - "Electronics 409D";
2) without a decimeter channel selector, but with the possibility of installing it - "Electronics 409".
The televisions used a 16LK8B type kinescope with a screen size of 16 cm diagonal and an electron beam deflection angle of 70 °
TV "Electronics 409" provides:
Reception of television broadcasts of a black and white image on any of the 12 channels of the meter wave range, and the Elektronika 409D TV, in addition, on any of the 40 channels (from 21 to 60) of the decimeter wave range in the zone of confident television signal reception (in the zone of uncertain picture and sound quality cannot be guaranteed);
Listening to the soundtrack on headphones with the speakers turned off.
Headphones are used with a resistance of at least 200 ohms with a Sh2P plug.
Efficient automatic gain control ensures a stable image.
The TV set consists of several functional units (blocks) placed in a lightweight plastic case.
Printed mounting, made on three rotary boards.
The TV used electronic tuning to the received channel using the "Tuning" knob located on the front panel of the TV (Fig. 1).
On the left side there is a socket for connecting headphones... (Fig. 1),
The panel with control knobs "Sound" ... "Brightness" ... "Contrast" ..., channel switches for meter and decimeter waves, as well as the TV transfer knob are located on top (Fig. 2, 3).
On the bottom of the case there is a folding stand, used if necessary for more convenient viewing of programs.
At the back of the TV housing there is a socket for connecting a telescopic antenna, an external MV antenna and a UHF loop antenna. connector for connecting the power cord, the button to turn on the TV "NETWORK" ... (Fig. 3, 4).
Main technical characteristics
Image size 98X120 mm
Sensitivity limited by synchronization; no worse
I-III ranges 40 µV
IV-V ranges 70 µV
Resolution, not less than 400-50 lines
Audio channel output power 0.15 W
voltage from AC mains with a frequency of 50 Hz 220 V
voltage from an autonomous DC source 12 V
Permissible AC voltage fluctuation -10 to +5%
Power consumption:
from AC mains, not more than 17 W
from a DC source, not more than 8.0 W
Dimensions 178X160X225
Weight, no more than 3.15 kg
Preparing the TV for use
Installation order
When choosing a place to install a TV, it should be borne in mind that extraneous light falling directly on the screen makes it necessary to resort to an increase in image contrast and brightness of the screen, which reduces the life of the kinescope. Therefore, install the TV in the least lit place.
If moisture gets into your TV set, then turn it on and let it dry at room temperature in a dry place for 3-4 hours.
If the TV is brought from the street into a warm room in winter, then before turning it on, it must be allowed to warm up to room temperature for 12 hours,
do not place the TV near stoves, fires, central heating radiators and in damp places.
Place the TV on a solid surface for better sound.
Connecting to AC power and setting up the TV
The TV is produced by a factory prepared for connection to the mains with a voltage of 220 V.
Before connecting the TV to the network, you need to make sure that the TV's power button "NETWORK" is in the up (off) position. Then connect the power cord to the power connector located on the back wall of the TV casing (Fig. 3), and plug the plug into the power outlet.
Turn on the TV by pressing the "NETWORK" button.
When receiving television broadcasts in the meter wave range, press the appropriate button for the "MV" range switch, depending on which of the television channels is broadcasting "1-5" or "6-12" channels.
The tuning scale on the front panel of the TV is applied approximately. After the raster (luminous screen) appears, use the “Settings” knob to tune the TV to the desired program. After the appearance of sound and image, turn the knobs "Adjustment", "Brightness", "Contrast", "Sound" to set the best quality of image and sound,
The TV set can be adjusted according to the test table in Fig. 6, as well as during the transmission of a television program, achieving the correct image using the main control knobs. In this case, it is necessary to be guided by the following: the “Contrast” knob is set to a position in which the image will have the correct halftone ratio and the clarity of the boundaries between white and black.
The Brightness knob is set to a position where the white parts of the image would look fairly light. You should never make the brightness excessive, as increased brightness tires the eyesight and shortens the life of the kinescope.
The main criterion for image quality is clarity. Clarity but vertical is determined by the horizontal wedges in the middle of the table (Fig. 6).
Horizontal clarity is determined by the vertical wedge of the table. The numbers next to the section of the wedge, where these lines begin to merge, characterize the clarity of the image.
The contrast and brightness of the image are checked against two vertical gradation bands located in the central circle of the test chart. Each stripe is divided into 10 different white-to-black staggered sections. Getting different 6-8 gradations corresponds to the correct setting of contrast and brightness.
With a properly configured TV:
a) the image of the table must occupy the entire screen area and must be correctly oriented;
b) the image must be stable;
c) the image must be clear and well focused;
d) the large circle in the center of the table should be as correct as possible;
e) the sound should be clear and its volume should be well regulated.
When viewed from a close distance, the line structure of the image should be visible.
Turning off the TV is done by pressing the "Network" button (upper position), after which the power cord plug is removed from the power outlet.
Connecting the TV to the car's on-board network
Set the "Network" button to the "On" position (lower position of the button).
One end of the special power cord supplied with the TV is connected to the power socket on the back of the TV casing, and the other end is connected to the car's cigarette lighter socket. After that, press the "Network" button, setting it to the upper position "Off". Further operation with the controls is similar to turning on the TV in the AC mains.
The performance of the TV is maintained at a DC voltage of at least 12 V.
Using the Telescopic Antenna and Connecting an Outdoor Antenna
To receive television broadcasts in the meter wave (MV) range, the TV has its own retractable telescopic antenna located behind the TV (Fig. 3).
The telescopic antenna is oriented in such a way as to obtain the best picture and sound. With a strong signal, the length of the extended antenna can be reduced. When carrying the TV, the telescopic antenna must be folded and fixed on the stop.
If the signal is weak (at home), you must use an external antenna, for which you need to disconnect your own and connect the external antenna to the antenna jack located at the back of the TV (Fig. 4). As an outdoor antenna in the field at a great distance from the TV center, you can use a wire 6-10 m long, which is attached to a mast, tree or any other tall object. In this case, the higher the antenna is mounted, the better the reception.
Reception of television programs in the range of decimeter waves (UHF)
To receive broadcasts in the UHF range on a TV, you must:
Install the vertically folded telescopic antenna, first disconnecting its connecting plug from the socket. Fix the UHF loop antenna on the body of the telescopic antenna. Connect
Connecting the TV to the car's on-board network
Using a telescopic antenna and connecting an outdoor antenna
UHF antenna cable to socket
Press the "DMV" range switch key to the "DMSH" position (lower position of the switch);
Turn on the TV in the network;
Slowly turning the knob "Settings" on the scale on the front panel, select the desired program.
Additional adjustments
In addition to the main control knobs on the TV, there are auxiliary adjustments that are brought out under the slot and located at the bottom of the TV casing.
Frame frequency. If the image is moving in the vertical direction, use a screwdriver to carefully turn the Op. get a stable image.
Line frequency. Random stripes on the screen, twitching of individual lines or groups of lines, eliminate with a screwdriver by carefully turning the knob
Listening to the sound of TV programs on the head phone
To listen to the soundtrack of TV programs on the head phone, you need to insert the head phone plug into the socket on the side wall of the TV (Fig. 1), and the TV speakers turn off.
When using a headphone, do not set the volume too high, as this will distort the sound,
Warranty
The TV corresponds to the approved sample.
The manufacturer guarantees the compliance of the TV set with the requirements of technical specifications 2.025.001TU, provided that the owner observes the operating rules set forth in this instruction manual.
The warranty period for the TV set "Electronics 409" ("Electronics 409D") is 18 months from the date of sale through a retail network.
During the warranty period, the owner has the right to free maintenance of the TV, and in the event of a violation of its performance, to free repair upon presentation of the warranty card. At the same time, one tear-off coupon is cut out for the corresponding type of service.
The product is serviced and repaired by a repair facility serving the area where the owner lives.
For warranty repair information, contact your nearest radio store.
Without the presentation of warranty and tear-off coupons and (or) violation of the safety of the seals on the TV, claims to the quality of work are not accepted and warranty repairs are not performed.
During the warranty period installed on the TV, repairs are made at the expense of the owner if he does not operate it in accordance with this “Operating Manual” or does not follow the recommendations of the repair company aimed at ensuring the normal operation of the TV.
The exchange of a faulty TV is carried out through a distribution network upon presentation of a certificate from a repair company and a warranty card in accordance with the current republican rules for the exchange of industrial goods purchased in a retail network of state and cooperative trade.
The documentation supplied with the TV is not renewed if lost.
The shelf life of the TV after release should not exceed 24 months.
Information about the content of precious metals in the TV "Electronics 409, 409D" (in grams)
gold - 0.10654 silver - 0.803942 palladium - 0.275054
1991 and 1993
"Electronics-409" and "Electronics-409D" are Soviet portable black-and-white televisions built using microcircuits. They are distributed throughout the CIS countries, where they became famous as reliable, lightweight and easy-to-repair portable TVs. These "TVs" are able to work both from a 220V socket and from any 12V source, for example, the car's on-board network. This TV model was produced from 1988 to ~1996 at the Kation plant, Khmelnitsky, Ukraine. TVs with the letter "D" in the name are capable of receiving 39 more channels than those without a letter due to the presence of a decimeter range. At the turn of the decade, "409th Electronics" were produced in 3 body colors: white, ivory, black, dark red, green (rare). In the last five years of release, they were produced under the brand name "Electronics" and only in a black case (photo). There may have been other modifications. For export, the model with UHF was produced under the brand name " TeleStar 4004". In addition, the Electronics-409VKU monitor was produced, designed for use with the L-50 video surveillance camera. In the 90s, the “Electronics 16TB-410D” model was produced in small series, which was distinguished by the presence of a push-button channel selection unit. However, it has not been widely adopted.
At the Virtual Museum presented two copies. First, white released in 1991 (not earlier than August, most likely in autumn) and was found in February 2012 near dumpsters. Then I had nothing to do, and I decided to try myself in a new field - the repair of analog electronics. After cleaning, it became clear that this TV is a good opportunity to try your hand. At first there were suspicions that the kinescope was broken, but the trial inclusion showed the conditional performance of the TV. Cracks at the points of glass welding in kinescopes are a normal phenomenon, and do not always mean a loss of tightness. The previous owner soldered the video input for the Spectrum type game console, but it was obviously made on the knee from a big hangover, so it was decided to unsolder it and return the native UPCHIiZ circuit 🙂.
I got the TV with a malfunction, which manifested itself in the form of a complete lack of focus and a dark raster (i.e. image) [ video]. Inspection showed the presence of a burned-out resistor R1 2 and a darkened, but serviceable R1 5. The burned-out resistor was replaced. When the test is turned on, R1 5 burned out completely, with smoke. They are responsible for the formation of focusing (image sharpness) and accelerating (image brightness) voltages. What's the matter? It turned out that the high-voltage capacitors C9, C10 were broken and caused a short to ground. After replacing the resistors and the specified capacitors, the TV worked fine, the image became a little brighter and sharp enough. However, the kinescope was shrunken and shone dimly. After some time, at the then unified forums “Domestic Radio Engineering of the 20th Century”, an announcement appeared for the sale of a new kinescope in its original packaging, which was immediately bought by me. After replacing the tube with a new one, the image became excellent. The repair cost 640 rubles, but most importantly - experience!
After a while, the TV suddenly turned off. It turned out that the capacitor C6 broke through in the collector of the horizontal output transistor. The air conditioner was replaced with a new one, and the TV started working again.
There was another malfunction on the TV, this time appearing intermittently. After half an hour or an hour of work, tuning to channels began to run away. At first I thought about the channel selectors, then the +15V stabilizer, but the reason turned out to be ... dirt on the +15V stabilizer board. It was partially washed off with acetone, and the glitch began to appear much less frequently, but still remained. Most likely you will have to buy an ultrasonic bath, some detergents, and somehow wash it there.
Second, black"Electronics-409D" appeared in 2014, similar to the first (white) TV. Unlike him, the TV turned out to be fully functional, with the exception of a planted kinescope. I didn’t want to buy a new kinescope, anyway, it will stand on the shelf most of the time, and I first put my own kinescope from a white TV. He was also shrunken, but not as much as the native black TV. After that, I made a “shoot through” from the cathode to the modulator, and the kinescope began to show almost as brightly as the new one. The backache was done like this: I removed the socket from the kinescope, took a similar socket left over from the disassembly of another TV (Electronics VL-100), and assembled a circuit for shooting through the focusing voltage. I let the kinescope warm up, turned on the power of the TV, and twice for half a second touched the free output of the resistor Rogr (which can be of any value, this is a rudiment from the previous “shooter” that I forgot to remove) the focus resistor slider. The screen immediately lit up with bright light (and this is without accelerating voltage!). I turned off the TV, connected my own socket, turned it on - the picture is a fairy tale! 🙂 Further, it turned out that the reason for the almost complete depletion of emission from the native kinescope was an increased supply voltage. The power supply gave out 10.9 volts instead of the prescribed 10.5. In the white TV, apparently, the voltage was always normal, so the kinescope was better preserved there, although not by much. I set it to 10.50 V, completely adjusted the alignment, as a result, the image became even a little better than that of the white Electronics-409 with a new kinescope.
Interestingly, not a single bad electrolytic capacitor was found in any TV. Only in the “white” I replaced one electrolyte in vain, but it turned out not to be the case. All K50-35s produced by Kation have lived successfully for more than 20 years.
Video about how the TV works
Elektroniki-409 uses a 16LK8B kinescope with a diagonal screen size of 16 cm and an electron beam deflection angle of 70°. The TV provides: reception of television broadcasts of b / w images on any of the channels of the meter wave range, and the TV "Electronics 409D", in addition, on any of the 40 channels of the decimeter range; listening to the soundtrack on headphones, with the speakers turned on. Effective AGC ensures a stable image. The TV set consists of functional units placed in a plastic case. The printed circuit assembly is made on 3 rotary boards according to the “wickets” system. The TV has a varicap tuning to the received channel using the "Settings" knob located on the front panel of the TV.
Specifications:
Image size…. 98x120 mm.
Sensitivity………. 40-70 uV.
Resolution.. 400 vert., 576 hor. lines
Output power UZCH ……….. 0.15 W.
Power consumption.. up to 17 W.
Dimensions 178x160x525. Weight 3.15 kg.
"Electronics 409D" and "Electronics 410D" - small-sized semiconductor TVs using integrated circuits.
The televisions used a kinescope type 16LK8B with a screen size of 16 cm diagonally and an electron beam deflection angle of 70 °.
TV provides:
Reception of television broadcasts of a black and white image on any of the 12 channels of the meter wave range, and on any of the 40 channels (from 21 to 60) of the decimeter wave range in the zone of confident television reception;
Listening to the soundtrack on headphones with the speakers turned off. Headphones are used with a resistance of at least 200 ohms with a Sh2P plug.
Efficient automatic gain control ensures a stable image.
The TV set consists of several functional units (blocks) placed in a lightweight plastic case.
Printed mounting, made on three rotary boards.
The TV "Electronics 409D" used electronic tuning to the received channel using the "Settings" knob located on the front panel, and the channel switches for meter and decimeter waves are located on top of the TV receiver.
In the TV "Electronics 410D" channel switching is push-button, the choice of television programs is made by a 4-program switch located on the front panel of the TV. To switch to the desired program, you must press the button corresponding to the number of the selected program. With any button pressed, the TV can be tuned to any of the received programs.
To do this, press the selected button on the program selector;
set the range switch to one of three positions (I-III):
I position - for 1 - 5 channels of the meter range;
II position - for 6 - 12 channels of the meter range;
III position - for 21 - 60 UHF channels;
and turn the tuning knob to find the best picture and sound. The direction of rotation of the regulator in one direction or the other is indicated by the moving arrow located to the right of the adjustment knob.
The presence of automatic adjustment of the local oscillator frequency ensures program switching without additional adjustments and improves the quality and stability of the received image.
Headphone jack on the left side 
Above is a panel with "Sound" control knobs. 
, "Brightness" 
"Contrast" 
, as well as the TV carrying handle.
At the bottom of the case there is a horn speaker system with two loudspeakers. At the back of the TV case there is a socket for connecting a telescopic antenna, an external antenna. MB "and loop antennas" "UHF", a connector for connecting the power cord, a button to turn on the TV "NETWORK".
Main technical characteristics:
Image size 98X120 mm
Sync-limited sensitivity is no worse
I-III ranges 40 µV
IV-V ranges 70 µV
Resolution, not less than 400-50 lines
Audio channel output power 0.15 W
Nutrition:
voltage from AC mains with a frequency of 50 Hz 220V
voltage from an autonomous DC source 12V
Permissible AC voltage fluctuation -10 to +5%
Power consumption:
from AC mains, not more than 17 W
from a DC source, not more than 8.0 W
Dimensions 178X160X225
Weight, no more than 3.15 kg
Headphone Jack and TV Tuning Knob
Figure 1. Front view of the TV
Fig, 2. View of the TV from above,
Rice. 3. View of the TV from the back.
Rice. 4. Location of TV setting items"Electronics 410D".
Schematic diagram of the TV set "Electronics-409D" (PIT-16-6)
Radio channel.
SKM-30-1 (A1.2) and SK-D-30-1 (A1.1) are used as SC, using connectors installed on the AI cross-board (Fig. 3.28). The IF signal from the block A1 .2 (contact XS5/8) through the contact XS6/8 is fed to the input of the UPCHiZ block (A1.3)
Through the terminating resistor R2, the IF signal comes to the preliminary UPCH, made on transistors VT1, VT2, which compensates for the attenuation of the filter Z1 (SAW), which is its load; elements L1, R9, L2, R10 - matching. The main amplification of the IF signal is carried out by the D2 chip; it also performs synchronous detection of the IF signal (reference circuit L3, C12, R17) and preamplification of the video signal.
Video channel.
From the output of the D1 / 11 chip through R19 and contact XS6 / 4, a positive polarity video signal is fed to a variable resistor R15 (A2). So that when adjusting the contrast, the brightness of the image does not change, the conclusions of R15 are made equipotential in direct current using a divider 2R18, 2R14.
The VU circuit on the 2VT2 transistor is similar to those considered: 2C11 - RF correction capacitor, elements 2VD3, 2C15, 2R31 serve to limit the kinescope current.
A quenching device is made on the 2VT3 (OK) transistor: personnel (from the 1VT2 emitter) and line (from the ZT1 / 10 output) reverse pulses, passing through it, increase the potential of the 2VT2 emitter, which ensures its closing.
Sound channel.
The selection of the signal of the second IF sound is carried out in the microassembly El (A1.3) (see Fig. 3.28) using a piezoceramic filter located in it; signal clipping, amplification and frequency detection also take place here (a piezoceramic filter inside the microassembly is also used as a reference circuit).
The audio signal is removed from the output E1 / 6 and through the capacitor 15 is fed to the output of the block - contact XS6 / 2. The operational volume control (see. Fig. 3.27) is a variable resistor 2R12. The 2R9 trimmer resistor allows you to change the gain of the 2D1 chip.
The cascade on the transistor 2VT1 (OK) generates a voltage of +9 V to power the 2D1 microcircuit.
ARU device.
A feature of the circuit is the use of a peak detector; a control voltage proportional to the amplitude of the video signal is allocated on the capacitor SP (A 1.3) and is fed to the first two cascades of the UPCH located
inside the chip Dl (A1.3). The AGC voltage with a delay, which is determined by the position of the slider R16 (A1.3), is allocated to the capacitor C4 (A1.3) and fed to the base VT2 (OK), from the emitter of which through the divider R3, R1 enters the base VT1 to adjust the gain of the preliminary UPCHI. With an even higher video signal level, the voltage at C4 (A1.3) becomes less than the voltage at the connection point of the resistors R8 and R11, the VT4 EP opens, and the AGC voltage is supplied to the SC.
Synchronization channel.
The video signal of negative polarity from the XS6 / 3 contact through the noise suppression circuit R3, C7, C9, R4, C8 (A1) is fed to pin 9 of the 1D1 microcircuit (amplitude selector input), and also through C10 to the output
1D1/10 (interference selector input).
The selected frame SI from the 1D1/8 output through the 1R20, 1C20 filter and the EC on the 1VT3 transistor with the 1C22 isolation capacitor are fed to the ZGKR for its synchronization. The lowercase SI is used to synchronize the ZGSR located inside the 1D1 chip.
Frame scan block.
On transistors 1VT1, 1VT4, ZGKR is made according to the scheme of an asymmetric multivibrator; the repetition rate of the generated pulses can be changed using a variable resistor 1R25; on the transistor 1VT5, the pre-output stage is made, and on the transistors 1VT6, 1VT7, the output stage of the KR, similar to those previously considered.
The cascade on the 1VT2 transistor serves to supply personnel pulses to the damping device.
Horizontal block.
The repetition rate of horizontal pulses generated by the ZGSR in the 1D1 chip can be changed using the 1R12 resistor. A feature of the APCiF circuit is the use of automatically switched low-pass filter on the elements R7 C12, R8 C13 (A1) according to the presence or absence of synchronism in the system, which allows you to combine high noise immunity with
wide swath. The same microcircuit is included in the automatic control ring, which provides an earlier arrival of the opening pulse to the base of the output transistor 3VT1 (taking into account the finite time of its switching); the position of the front of the control pulse can be adjusted using R15 (A1) The 3VT2 transistor is a pre-output transistor, line pulses from the 2D 1/3 output come to its base.
Power Supply
A5
AC mains voltage is supplied to pins 5-6 of the XP9 connector, then through the fuse FU1, and switch S1 to a step-down transformer T1, after which to a rectifier assembled on diodes VD1-VD4.
The rectified voltage, after filtering by capacitors C2, C3, is fed to the emitter of the regulating transistor. The stabilizer is made on transistors VT1-VT3. Elements R1, R2, R4, R6, VD5 form a balanced bridge, the diagonal of which includes a DC amplifier on a transistor VT1. When the bridge is unbalanced from the collector of the transistor VT1, the amplified voltage is applied through the emitter follower (VT2) and the limiting resistor R5 to the base of the transistor VT3. Depending on the sign of the change in the output voltage, the transistor VT3 changes its conductivity in such a way as to compensate for the output voltage drift and restore the balance of the bridge. Trimmer resistor R4 sets the initial bridge mode. The stabilization circuit also performs the functions of protecting the power supply from short circuits. In the event of a short circuit or severe overload, the output voltage drops and the Zener diode VD5 closes, which also leads to the closing of the regulating transistor VT3.
Capacitor C4, when the power supply is turned on, ensures a smooth increase in the output voltage of the stabilizer to the nominal value.
When the TV is powered from a DC source, a voltage of + 12 V is supplied through contacts 1-2 of the XP "9 connector and switch S1 to the emitter of the transistor VT3. At the same time, the filter capacitors C2, C3 and the rectifier bridge are disconnected from the stabilizer. The R9VD6 circuit is used to start the stabilizer and protect it in case of incorrect connection of the polarity of the constant source.
At the moment a positive voltage appears on pin 7 of the A5.1 board, the regulating transistor VT3 is closed and the positive voltage, passing through the resistor R9 and the VD6 diode, begins to charge the power filter capacitors installed on the A1-A3 boards. As these capacitors charge, the voltage rises, reaches the breakdown voltage of the Zener diode VD5, and the stabilization circuit begins to work.
Schematic diagram of the TV "Electronics-410D" is presented below.
Archive with diagrams here: shema.zip
Kinescope 16LK8B with a flat rectangular aluminized white luminous screen,
70° diagonal beam deflection angle, electrostatic focusing and electromagnetic beam deflection.
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DIAGRAM OF CONNECTING ELECTRODES WITH TERMINALS |
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Parameter name. unit |
N o r m a |
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Heating voltage, V |
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Glow current, A |
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Anode voltage, V |
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Voltage at the accelerating electrode, V |
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Focusing electrode voltage, V |
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Blocking voltage, V |
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Modulation voltage, V |
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Resolution, lines |
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Screen brightness, cd/m2 |
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NOTE:
It is allowed to operate the kinescope at the limit values of the electrical modes established in Table. I
for television receivers designed before 1981.
Table I
At the same time, in the mode U a = 9000V, I a \u003d 40 μA, the brightness of the glow is guaranteed at least 130 cd / m 2
And the focusing voltage is not less than 150V and not more than 450V.
MAXIMUM PERMISSIBLE MODES OF OPERATION
NOTE:
Anode (cathode) current during run and reliability tests for 1500 ns. as part of TVs should be no more than 35 μA
Kinescope 16LK1B
U - accelerating electrode;
2 - focusing electrode;
3 - cathode: 4.7 - modulator;
5 and 6 - heater (filament);
BUT - The side outlet on the cylinder is the anode.
The display color is white.
The resolution in the center of the screen is not less than 600, in the corners - not less than 550 lines.
Durability not less than 1000 h,
Electrical and lighting data
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U k B |
I k A |
U a HF |
U a B |
U F.E. IN |
U M.E.V |
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1,35 |
0,28 |
0-400 |
25±15 |
Modulation voltage (with screen brightness from 0 to 100 cd/m2), V. . . . . 15
Screen brightness (at an anode current of not more than 45 µA), cd/m 2 . . . . . . . . . . . . 150
Contrast . . . . . . . . . . . . . . 100:1
Leakage current, µA:
between the cathode and the anode (at the voltage on the modulator - 50 V). . . . . 3
RADIO CHANNELS OF TV BROADCASTING
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Number channel |
Bandwidth radio channel, MHz |
Carrier frequency, MHz |
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Images |
sound |
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I frequency range |
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48,5-56,5 |
49,75 |
56,25 |
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58,0 66,0 |
59,25 |
65,75 |
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II frequency range |
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76,0 84,0 |
77,25 |
83,75 |
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84,5 92,0 |
85,25. |
91,75 |
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92,0 100,0 |
93,25 |
99,75 |
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III frequency range |
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174,0 182,0 |
175,25 |
181,75 |
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182,0 190,0 |
183,25 |
189,75 |
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190,0 198,0 |
191,25 |
197,75 |
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198,0 206,0 |
199,25 |
205,75 |
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206,0 214,0 |
207,25 |
213,75 |
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214,0 222,0 |
215,25 |
221,75 |
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222,0 230,0 |
223,25 |
229,75 |
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IV frequency range |
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470,0-478,0 |
471,25" |
477,75 |
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478,0 486,0 |
479,25 |
485,75 |
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486,0 494,0 |
487,25 |
493,75 |
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494,0 502,0 |
495,25 |
501,75 |
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502,0 510,0 |
503,25 |
509,75 |
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510,0 518,0 |
511,25 |
517,75 |
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518,0 526,0 |
519,25 |
525,75 |
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526,0-534,0 |
527,25 |
533,75 |
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534,0 542,0 |
535,25 |
541,75 |
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542,0 550,0 |
543,25 |
549,75 |
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550,0 558,0 |
551,25 |
557,75 |
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558,0 566,0 |
559,25 |
565,75 |
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566,0-574,0 |
567,25 |
573,75 |
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574,0 582,0 |
575,25 |
581,75 |
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V frequency range |
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582,0 590,0 |
583,25 |
589,75 |
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590,0 598,0 |
591,25 |
597,75 |
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