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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING Repair of a loop in a radiotelephone, a car. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies The connection of moving elements or printed circuit boards to each other in industrial equipment is carried out by flat cables (loops). During operation, one of the conductors in such loops often breaks, and the device's performance is impaired. To search for a faulty contact, the loops are "ringed" with an ohmmeter, carefully bending the connecting tracks in different directions to identify the "flickering" contact in each track. In my "Texet TX-D5300" radiotelephone (made in China), after falling to the floor from a height of 1,5 m, the display of the portable "tube" stopped showing individual character segments. I had to disassemble the radiotelephone and look for a malfunction. It consisted in the loss of contact between the tracks of the loop and the contacts on the display board (Fig. 1)
In my opinion, given the rapid obsolescence of radiotelephone models. it is unreasonable to spend time and money searching for and acquiring a new cable, and then fiddling with its installation. On fig. 2 shows that the contacts of the cable are glued to the display, and in this part the repair is almost impossible.
On the other side of the cable, the contacts are soldered to the board in a checkerboard pattern (Fig. 3).
To repair the cable, remove the back cover of the radiotelephone case and remove the batteries. Unscrew the fixing screws (2 in this model) With a flat screwdriver inserted into the joint of the body halves, carefully separate them. After that, the board mounting screws (2 more) become available by unscrewing them. remove the main circuit board. A plastic cover is removed under the display (it is held on with double-sided tape). With a medical needle, observing through a magnifying glass, they clean off the insulation of the cable conductors, periodically sharpening the needle on a well-aimed emery bar. Then, with a low-power soldering iron (with a power of not more than 25 W) with a piece of copper wire wound around the tip, as a thin and sharp tip, solder the stripped sections of the cable, removing the remnants of plastic insulation With a scalpel blade or a thin knife, 1 ... 2 mm of the plume section is cleaned and irradiated with it. The conductor is then soldered to the PCB. In the event of a break in several conductors, these operations are repeated. An almost repaired loop is checked for gaps between all adjacent conductor tracks. The next step is to wrap the thermal film (from the printer) or thick polyethylene in one layer at the newly soldered tracks of the cable and heat it with an iron until it melts easily (the film of the cable begins to melt and sticks well to the board). At this stage, the main thing is to drive the iron smoothly, with gentle pressure. The cable on the other side is also processed (near the phone display board, if the indicator is attached using rubberized tracks). When one or more trails of the plume broke off not at the edge, but in the middle (usually this is noticeable visually, even with the naked eye). To restore it, it is better to duplicate the tracks with segments of a thin flexible mounting wire, for example. MGTF-0.6. The radiotelephone is assembled in the reverse order. If the loop is small in terms of the number of tracks (for example, up to 10), it can be made "on the knee" by fixing the connecting conductors on a strip of wide medical adhesive tape (on a fabric basis). Conductors are placed on a piece of plaster. corresponding to the length of the standard cable, one to the other. The length of the conductors varies in a checkerboard pattern (in addition to the corresponding "pattern" on the printed circuit board, this is also necessary in order to protect the soldering place of the previous one from touching the soldering tip when soldering the next conductor) In the same way, you can quickly repair radio telephones of other models, and even cell phones. in which the connecting cable has "broken" (frequent malfunction of sliders and "clamshells") or partially lost contact.
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