In detail: do-it-yourself motorola walkie-talkie repair from a real master for the site my.housecope.com.
The most typical, often recurring malfunction of this type of radio is the break of the spring contacts of the battery compartment, the repair of which is advisable to solder more powerful analogs of domestic production.
- Receiver malfunctions
To troubleshoot the receiving device, the radio station developer offers the technique shown in Fig. 3.18.
- Transmitting device malfunctions
As already noted in the section above, when considering the faults of the transmission device of the portable radio station "Transport", the main external signs of a faulty transmitter of the considered GP300 radio station are:
- lack of output power;
- no modulation in the presence of a carrier;
- no carrier.
In the absence of transmitter output power, the radio station developer proposes a malfunction detection method, shown in Fig. 3.19.
In the absence of modulation and the presence of a transmitter carrier, the troubleshooting procedure proposed by the radio station developer is shown in Fig. 3.20.
Microprocessor, controlled voltage generator and synthesizer malfunctions
As mentioned in the description of the GP300 radio, the microprocessor, VCO and synthesizer are common radio devices and are used both during the operation of the receiver and during the operation of the transmitter.
Consequently, a malfunction in any of these devices is the cause of failure in the operation of both the receiver and the transmitter.
Therefore, it is necessary to search for malfunctions in the named devices in the case when external signs indicate that the radio station as a whole is not working, and not the receiver or transmitter separately.
 |
Video (click to play). |
In fig. 3.21 presents a method for detecting a malfunction in a microprocessor, proposed by the radio station developer.
In fig. 3.22 presents a method for detecting a malfunction in a controlled voltage generator, proposed by the developer of the radio station.
In fig. 3.23 shows the synthesizer malfunction detection method proposed by the radio station developer.
When troubleshooting in all devices and units, it is necessary to know all the modes indicated in the tables below:
The source can be downloaded from the Master Cog website in the Useful Literature section. Ask questions in the comments below. Each transmitter, in the ideal case, should emit only the fundamental frequency - the working frequency on which the transmission is made! It is good practice to start troubleshooting by checking that the supply voltage is present at the consumers. The saturation of the power supply circuit with voltage stabilization, switching, monitoring and control devices, complicating it, increases the likelihood of a malfunction and, at the same time, makes it easier to find them. More details ... Earlier, we considered one of the simple ways to control the frequency synthesizer of domestic radio stations popular among radio amateurs "Mayak", "Overpass", "Transport", etc. They have good characteristics of transmission and reception paths and a built-in frequency synthesizer. Chernigov, Kiev, Kharkov, Lvov, Dnepropetrovsk, Odessa and other cities This section describes malfunctions of professional radios Motorola, Icom, KENWOOD and methods of their elimination in the field, if possible. Amateur radio stations for tourists, hunters, snowboarders have similar problems. The radio station (walkie-talkie) does not turn on. There may be several reasons: The rest of the reasons require more dense intervention, as a rule, it is a check of burnt parts in the power supply circuit. The radio station (walkie-talkie) is not charging. There are also several reasons: In other cases, a thorough check of all circuit elements will be required. The radio station (walkie-talkie) turns on, but does not work. The reasons may be as follows: These are just some of the most common reasons why the radio turns on, but refuses to work at the same time. There is no signal transmission from the radio station (walkie-talkie). Or "why can't you hear me": The rest of the radio station malfunctions are checked and eliminated by the master using special equipment. There is no signal reception from the radio station (walkie-talkie). "I can't hear anyone." Further more complex problems follow and, as a rule, require replacement of faulty radio receiver units. Users browsing this forum: no registered users and 1 guests You you can not start threads Motorola walkie-talkies are convenient to use in many areas of human life: hunting, in everyday life, the work of truckers, to ensure the security of enterprises. This is achieved due to the compactness, versatility, as well as the comfort of wearing the product. Radios provide wireless, free communication between users within a specified radius, usually 5 to 10 km, on selected frequencies. Usually Motorola products have several channels, are provided with anti-noise, a small selection of sound signals. If the Motorola walkie-talkie is out of order, then on the website> you can order motorola walkie-talkie adjustment and repair. The price of repair services is low, and sometimes even free. The ability to repair almost any kind of malfunction. They are so simple that they are trusted by children from 8 years old. This is a great way to walk around the hypermarket and not worry about your baby getting lost. To gain dexterity, you can practice in the yard, playing hide and seek with the younger generation using radio stations. For a specific case, a model with the following characteristics is ideal:
placement in a breast pocket; However, all these amenities are equally important to climbers or bike riders. Good audibility is guaranteed with a noisy traffic of cars, accompanied by working excavators and other construction equipment. By using Motorola radios for more serious activities, additional device functions become important: Motorola radios are provided with: Most of the developed models do not require a license. The reliability and versatility of Motorola radios allow them to be used in various fields of activity: at security companies, hunting, hiking, fishing and other industries. Motorola walkie-talkies with LPD and PMR bands (i.e. 433 and 446 MHz) have earned an excellent reputation and are widely used among various segments of the population. Such popularity became possible due to the competent combination of functionality and prices of various models of Motorola's assortment range. Plus, the high quality of radio stations allows you to use them for a long time without losing the quality of radio communication. The entire range of Motorola radio stations has common patterns. Walkie-talkies are protected from dust getting inside, as well as from shock, vibration and high humidity. The communication range of the radio station in an open space can be up to 10 km, depending on the model. The real range in the field is usually about 4 km, in the forest - 3 km; at sea - 6 km, and in urban conditions with abundant buildings - up to 500 m. Motorola radios have a channel scan mode and other useful functions and modes. Power is usually supplied from a rechargeable battery or from four AAA batteries. Despite the high reliability of Motorola walkie-talkies, breakdowns do occur due to some circumstances. The most common malfunctions include: The radio-repair company is engaged in the repair of radio stations in Moscow. Our specialists are ready to perform the following types of diagnostic and repair work for Motorola radios: - device diagnostics for troubleshooting; The radio-repair service center is ready to perform a full range of repair work to eliminate faults of varying complexity. We are responsible for the quality of the work performed, therefore, we provide a guarantee without fail. Plus, our company maintains a low price level. Models of walkie-talkies that our service center deals with: Radio Forums about radio stations: portable, car, stationary radio stations. Descriptions, reviews, tests of walkie-talkies. shar63 December 24, 2010 11:59 am Partizan "24 Dec 2010, 16:34 The Amateur Radio Forum, by Barracuda (CBC), is in charge of PriceMan. Antiquary "25 Dec 2010, 10:43 shar63 »25 Dec 2010, 12:04 Antiquary "25 Dec 2010, 20:25 shar63 "25 Dec 2010, 22:45 Antiquary "26 Dec 2010, 16:26 shar63 "27 Dec 2010, 13:21 Antiquary "27 Dec 2010, 16:12 shar63 "27 Dec 2010, 23:38 You can download movies, clips, episodes, trailers for free, and you do not need to visit the Youtube site itself. Download and watch an ocean of endless video in high quality. Everything is free and without registration! Next, we rinse the vibrator with a good solvent (646, 647) to remove oxides and other contaminants. We take a rod of silicone glue for hot air guns and use a 40 W soldering iron to melt it between the turns of the vibrator to give the antenna mechanical rigidity and strength. We take a heat-shrinkable tube with a diameter slightly larger than the diameter of the antenna connector, put it on the antenna and press it with a hairdryer, along the entire length of the antenna, at a temperature of 130 - 150 degrees. An example of a repaired antenna of a portable radio station Kenwood TK-2107 is shown in the photo. 3.3. TLKR-T3 Portable Radio Squelch Adjustment Adjustment A fairly popular portable radio station Motorola TLKR T3 with all its advantages (weight 73 g - without batteries, real reliable communication in open areas 2 km, work at low power 0.5 W in the "allowed" 446 MHz band, price range - up to 1,000 rubles per set and others) there is one significant drawback. A rare walkie-talkie "survives" up to 1 year of active operation. Moreover, the malfunction always often manifests itself the same - the lack of reception at one of the radio stations of the set. Insofar as Motorola TLKR T3 does not have an adjustable noise suppressor, this significant drawback of a useful device becomes an obstacle to its intended use. But the drawback can be quickly eliminated by returning the device to normal mode, which will be discussed below. And at the same time, we will consider several more possible options for improving this model. Motorola TLKR T3 is still actively sold. It can work up to 20 hours without changing batteries. Additional interest in this lineup is also aroused by the fact that today a set of T3 radios, which was in use or stale in warehouses, if you are lucky, can be bought for only 600-700 rubles. Motorola produces quite a lot of stations for "local" radio communication. And for many reasons, several different designs were produced under the T3 brand (with changes in the printed circuit board that did not violate the principle of operation of the devices).The instructions contain a record that the manufacturer has the right to change the design without warning consumers. The TLKR T3 model differs from its brothers in a particularly original case "with curls" (Fig. 3.9); for these "fish soup" it is convenient to hang the radio on a carabiner (on a belt or a backpack), which has been repeatedly noted by tourists as a convenient function for carrying (see the comparative table). Rice. 3.9. The appearance of the original case Motorola TLKR T3 The radio antenna itself is built into the "ear" inside the case. Thus, in the T3 model there is nothing that could catch on, even with a small, but still protruding antenna pin (as in the T4, T6, T8 models). Such an "antenna" solution does not at all interfere with the stable communication of the T3 model, operating at a frequency of 446 MHz and a step of 12.5 kHz (with a maximum power of 0.5 W) for a distance of 2 km in an open countryside, which I confirm with real tests carried out by me in Verkhovazhsky district of the Vologda region in the summer of 2013. So, the automatic (unregulated) squelch in some cases of poor reception can be considered a disadvantage, but it is not difficult to fix it. To do this, you need to disassemble the station by unscrewing two self-tapping screws from the side of the sloping curves - "ears" (on the device body they are closed with plastic plugs) and one self-tapping screw in the battery compartment. After that, the body Motorola We open TLKR-T3 into two parts and get access to the printed circuit board and directly to the controls (see Fig. 3.10). Rice. 3.10. Portable radio station Motorola TLKR-T3 open case On PCB Motorola TLKR-T3 inscription Uniden. We turn the printed circuit board over to the other side and we have the view shown in Figure 3.11. Rice. 3.11. View of the printed circuit board from the side of the location of the main elements On the board you can see a trimmer with the designation (on the board) RT03. We will twist it. When you turn the resistor slider clockwise, the squelch sensitivity decreases, and it "passes" background radio interference (acoustic noise is heard in the dynamic head). This information, according to my idea, will be useful to everyone who does not have the electrical circuit of this model (it is not presented in open sources) or the time to study it. Thus, in cases of unstable communication, for example, when it is necessary to carry out radio exchange "at any cost" and health and life itself depend on it (in the mountains, on hikes, in case of loss of orientation in an unknown area), adjusting the resistance of this trimming resistor (you will need a miniature screwdriver with "Spade" 1 mm), you can improve the sensitivity on the air and receive an important message. The same possibility exists in software. After turning on the radio, by successive pressing of the “Menu” button, they switch to the “Monitor” mode, select / confirm it by pressing the RTT key, and the squelch is “automatically” turned off. But this option, which is described in the manual, does not perform the task when it is necessary not to turn off, but to adjust the squelch. And for this it is convenient to use the method discussed above - forced adjustment of the trimmer resistor marked on the printed circuit board RT03. Attention, advice! By the way, for those who will disassemble this device for parts, I highly recommend the SP487 16 Ohm speaker, 0.2 W. The same are used in "portables" of a higher class, for example Kenwood TH-F7, Yaesu VX-6R and others. As a recommendation, I suggest removing the protective sticker from the microphone. After such a refinement, the acoustic sensitivity becomes much better (compared to the second walkie-talkie of the set). Eliminating a frequently occurring malfunction. A common malfunction of this model is expressed in the fact that one of the radio stations in the set stops receiving a signal from the other; just silence in the dynamics. Accordingly, the squelch does not open at the receiving radio station and the radio communication indicator does not turn on on the LCD.The radio station did not fall down, did not "overextend" from incorrect power supply, and yet the "shaitan" inside it makes itself felt. This malfunction manifests itself literally six months or a year after purchase (from the beginning of the device's operation). Moreover, it was noticed that the less the radio station is used (it lies / gathers dust in the "bins"), the greater the danger of this situation, which, however, is quite easily removable. It is important to understand here that if you enable the “Monitor” mode by force-hardware (see above), then you can still hear the first radio through the background. But you won't work with this mode for a long time, the batteries run out, and it's just inconvenient. Therefore, we will still consider how to fix this problem. Using the first station periodically switched on for transmission as a signal generator, the oscilloscope found that the signal disappeared after a 450 kHz IF filter labeled CQ WM50HTV (see Fig. 3.11 - black rectangle in the center). You can check this version without an oscilloscope, literally on the knee. At the receiving station, turn clockwise the squelch resistor (see above) until the noise effect ("radio background") appears and press the transmitting push-button. If the call / speech passes against the background of noise, then the malfunction is detected correctly and the IF filter must be soldered / replaced. After replacing it, the noise will increase several times, so it will be necessary to adjust the trimmer resistor with the designation RT03 again. Further, after unambiguous identification of the source of the problem, you can go even in three ways. The first is to solder the filter contacts on the printed circuit board (on the reverse side - see Fig. 3. 10), the second is to replace the filter. In this case, the 450 kHz FPF can not only be purchased, but also removed from the radiotelephone cards; these are found in old cell phones Nokia 630 (the "outdated" NMT450 standard), modern GSM-form cell phones (even two each), radiotelephones, receivers, as well as in a key fob (with feedback) from the Alligator alarm (perhaps not only in these models ). The third way is as follows. If there is absolutely nowhere to take the WM50HT, and business does not tolerate, instead of the FPF, you can temporarily put a non-polar capacitor with a capacity of 1000-1500 pF. In this case, the sensitivity will decrease, but it will work. It happens in another way. In the receive mode, the "background noise" of the HF path is heard from the speaker. In this case, the signal from the first (transmitting) station does not turn off, but, on the contrary, turns on the squelch at the receiving station (the opposite effect to the above effect is obtained). The faulty (tested) radio station itself normally works for transmission. If the FPF is known to be working properly / checked, then in this case the problem is in the incorrect adjustment of the trimming resistor, which is also easily eliminated. Figures 3.12 and 3.13 show the adjustment illustration and appearance of the RT03 trimmer. Rice. 3.12. Practical adjustment of the RT03 trimmer Rice. 3.13. The appearance of the trimmer resistor near This problem is quite typical for many portable radios of this class and various models under the Motorola brand. It makes sense to restore these portable stations in this way, if only because they have a very decent sensitivity (relative to some other stations). Before me, there was interference in the radio station and not entirely accurate, since the entire circuit of the master oscillator. Before us is a magic station that works on magic smoke until the last one came out of it and the sound disappeared. Portable radio stations Motorola TLKR-T41 digital Multimeter DT9205A-. it became possible to record on video the process of restoring the disassembly of the regular battery repair. Radio station Karat-2N, repair. Complete replacement of electrolytic capacitors gives a truly magical. We get rid of piggy, pink and blue backlights without replacing the LEDs and even without a soldering iron. Eventually. My TOP USB oscilloscope MDSO ISDS205 Soldering station Yaogong 8586D + (878DA). In this video, you will see how I assembled a reinforced battery for the Baofeng uv-5r radio station at 2600 mA from the elements. Repair of the radio station. Search for the cause. Unusual cause of breakdown. Troubleshooting of a special breakdown. Good day ladies and gentlemen, frankly speaking, I don't often come across radio stations in such a dull state. It does not happen with the Chinese that you buy something, but it works fine and does not ask for modifications! Or in the most. We increase the communication range of the TLKR T4 Motorola radio, 446 MHz. By changing the standard antenna, by a quarter of a wave,. Repair restoration MegaJet MJ-3031M Turbo Video report on the repair of radio station MegaJet MJ-3031M Turbo for. A fully charged battery was enough for a day, given that the radio was turned off. Repair of car radio stations. Repair of the Megajet 3031m radio station. Remote control repair. Refinement of the Motorola XTR 466 walkie-talkie with new AAA batteries for charging in their own charger. I offer the following services: - Repair of radio stations of any complexity - Programming radio stations - Tuning. Repair, disassembly of a walkie-talkie vector, repair of a radio station vector VT 44H 2 walkie-talkies. Walkie-talkies for hunting and fishing. Repair of a civil radio station at 27 MHz there was no sound coming off the wiring on the PTT. We increase the communication range of the TLKR T4 Motorola radio, 446 MHz. We increase the communication range of the TLKR T4 Motorola radio, 446 MHz. Our company offers you services for the maintenance and repair of radio stations. Also, we carry out repair and maintenance of various related and auxiliary radio-electronic equipment of mobile operational radio communications. We carry out repair of radio stations and radio-electronic equipment practically of any level of complexity, starting with testing, setting up and programming radio electronic devices, ending with work on replacing electronic components with a high degree of integration. Also, we carry out work to restore the equipment after the intervention of "specialists", if for one reason or another you deem it appropriate. Repair of radio stations and radio-electronic equipment is not something unique, except for its specifics. It does not differ much from the repair of one or another electronic equipment with the appropriate knowledge, special software, measuring equipment and service documentation. For this reason, in 95% of cases, we are able to do our job without using ultra-complex and ultra-modern hardware and technical complexes. In most cases, our certified specialists are satisfied with the standard capabilities of test and measuring instruments, which allow our employees to realize their many years of experience, extensive knowledge of radio electronic equipment and special skills to achieve a positive result. However, when super-complex and time-consuming tasks arise, you can always count on the fact that we are ready to put at your service the intellectual and laboratory capacities of the leading manufacturers of telecommunications equipment and to solve almost any of your problems, no matter what. Today, using all our resources, we are one of the few Russian company that offers you prompt and high-quality professional repair of the widest range of conventional and trunking radio stations: Also, we carry out: preventive maintenance of equipment and communication facilities; programming / reprogramming of communication facilities; setting up the RES for the operating conditions you need; modernization of equipment within the framework of the capabilities laid down in it by the manufacturer; adjustment, additional equipment and preparation for installation work of antenna-feeder devices. At the end of the repair and restoration work, all serviceable equipment is adjusted according to the standard parameters declared by the manufacturers of this equipment, and a 3-month warranty is provided for the work performed. If necessary, serviceable radio stations and equipment can be reconfigured and reprogrammed according to your needs at the rates applicable for these types of work, upon your prior written notice. Repair services for radio stations are carried out only for legal entities, as well as for individuals, if the equipment provided for repair is purchased from our company. Estimated cost for basic repair services for radio stations / walkie-talkies:
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wearing on a belt or hand with a special strap;
the ability to call a specific user or even a group at once;
- setting the parameters of the radio;
- repair of the 5th category of complexity. Includes cleaning, programming, tuning of the radio station, replacement of body elements;
- 4th category. It implies the replacement of electromechanical elements: microphones, speakers, connectors, resistors, etc.;
- 3rd category. Replacement of components of a low integration chain, block repair, restoration of shielding;
- 2nd category. Replacement of semiconductors, replacement of various elements that are in hard-to-reach places, restoration of printed wiring;
- 1st category. Replacement of a highly integrated processor, replacement of microcircuits, correction of "floating" defects, elimination of microcracks and much more.
Squeeze the heated end of the heat-shrink tube with pliers.
We take another heat-shrinkable tube with a length of about 30 mm and shrink it on top at the junction of the vibrator and the connector, to increase strength, this is the most fragile place in our structure.
Video (click to play).
