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Walkie-talkie knowledge: common fault judgments and troubleshooting methods of walkie-talkies
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Walkie-talkie knowledge: common fault judgments and troubleshooting methods of walkie-talkies

  • Categories:Industry News
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  • Time of issue:2018-09-25 08:00
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Walkie-talkie knowledge: common fault judgments and troubleshooting methods of walkie-talkies

(Summary description)Some machines have leakage due to different operating environments or battery quality problems, and the machine and battery contacts will oxidize and corrode. It causes poor contact between the battery and the machine, and it does not turn on when it is severe. This phenomenon can generally be seen from the surface, the lighter can be scraped clean with a blade before use. If the battery is severely corroded, it is recommended that the battery be scrapped and the machine sent for repair.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2018-09-25 08:00
  • Views:
Information

In recent years, the use rate of walkie-talkies in various industries in the country has been increasing. The use of public security, armed police, forestry and other professional users, construction sites, property, security, and civilian amateurs has become more and more widely used. The following is a brief introduction to some of the most common faults and correct usage methods in daily use based on the author's maintenance experience over the past ten years, for the reference of walkie-talkie users.
  
   1. Antenna: The antenna is the most critical part of the transceiver. Once the antenna fails or is defective, it will affect the communication effect of the transceiver. Users often use the antenna with their hands to drive the entire walkie-talkie, and more seriously, pinch the tail of the antenna to shake the walkie-talkie. Since the antenna port is the entrance and exit of the whole machine for high-frequency reception and transmission, professional TNC, BNC, SMA and other interfaces are often used. At this time, due to the mechanical strength of the antenna itself, the antenna skin will fall off over time, the antenna pin will break, or the antenna pin will contact The surface becomes smaller, and in severe cases, the joint between the antenna pin and the circuit board will be desoldered. At this time, the standing wave emitted by the machine has become larger. In the case of continuous operation, some machines with poor protection measures will have troubles such as power tube, power amplifier module burnout, or power resistor burnout, and users will generally be unable to accept words. It will be sent for repair only if it is not. It is recommended to master the correct method of use during normal use, and always check whether the connection between the antenna and the antenna base is reliable, whether it is black or dirty, and whether the antenna is damaged. If it is damaged, it is recommended to replace the antenna and antenna base of the same model.
  
   2. Battery: The battery is the source of energy for the whole machine. Because the current is relatively large when the walkie-talkie is transmitting, the use of disposable alkaline batteries is relatively small. Most walkie-talkies use rechargeable nickel-cadmium, nickel-metal hydride, or lithium-ion batteries. Users often ask that the battery is not used for long enough, and the battery will be out of power after a few presses of the charge (PTT). In addition to the use of inferior batteries by some operators, which affects normal use, the correct use method can extend the battery. Use time and service life. Investigating and questioning users found that some users will charge it for a period of time in the charger when they want to use it, pick it up and use it, charging and discharging irregularly. Since the charge and discharge of nickel-cadmium batteries have memory characteristics, the phenomenon of insufficient charge will occur. There are also some users who do not use it for a long time, and put the machine with the battery on the charging stand for a long time. It is important to know that many simple chargers on the market do not have a full charge prompt and protection circuit, so that the battery will be overcharged after a long period of time, and the battery will be scrapped in severe cases. Users who use lithium-ion batteries are generally equipped with professional lithium battery chargers, but it is recommended that users recharge after every charging cycle. Although the lithium battery has no memory characteristics, the capacity will be greatly reduced after two to three hundred charge and discharge cycles.
  
   In addition, there are some machines due to different operating environments or battery quality problems, causing liquid leakage, and the machine and battery contacts will be oxidized and corroded. It causes poor contact between the battery and the machine, and it does not turn on when it is severe. This phenomenon can generally be seen from the surface, the lighter can be scraped clean with a blade before use. If the battery is severely corroded, it is recommended that the battery be scrapped and the machine sent for repair.
  
  3. PTT (transmission button): The transmission button is the most frequently used component in daily use. In some machines sent for repair, it was found that some of the machines had the rubber outside the transmission button aging or damaged, affecting normal use. Some of them affect the buttons on the circuit board, and there are faults such as poor button contact, button failure, etc. It is best to use the same type of device as the original machine when repairing.
  
   Four. Power switch, static potentiometer, stepping potentiometer: The power switch in the walkie-talkie is generally integrated with the volume potentiometer. Some low-end machines have problems with the quality of the components, which can switch the power supply, but have problems with the volume adjustment. It is recommended to replace good quality devices of the same model. The static potentiometer has fewer chances for repeated adjustments, but it needs to work in a certain position. Some users are afraid of troublesome adjustments and simply stick them with glue, which will bury hidden dangers for future maintenance. The stepping potentiometer is used for channel switching and manual programming. A good potentiometer feels very good, and the steps are clear when turning, and there is no smoothness. Some machines will damage the potentiometer shaft when they are dropped, making it impossible to change the channel and programming, and can only be replaced with new ones when they are sent for repair. At present, some machines use key switches. This type of machine should pay attention to the change in conductivity over time. Sometimes it will cause it to fail to turn on, or to turn it on after repeated pressing several times. When overhauling, you should first consider cleaning the keyboard and circuit board.
  
   5. Conductive keyboard: Most walkie-talkies are equipped with DTMF keyboards and programming buttons. If the keyboard is damaged, oil stains, individual buttons fall off, mice and cockroaches are found in the machine sent for repair. Such failures only need to be cleaned or replaced.
  
  6. ​​Speaker (speaker): The speaker is the key component of the walkie-talkie. Some users like to turn on the volume to the maximum. The audio amplifier of some machines is not designed to match well and will burn it. There are also some users in special environments. After using it for a while, the sound is getting smaller and smaller. During the inspection, it was found that there was a lot of iron powder on the sound film. If the iron powder is completely removed, it can usually be restored to the original state.
  
7. Audio components (headsets): Some users will use earphones and other external accessories due to work. Audio plugs are generally connected by special plugs and sockets. Over time, poor contact or disconnection of the sockets will occur, because sockets generally have movable disconnect points. At this time, a bad reception problem will occur. It is recommended to replace a good socket during maintenance.
  
   8. Machine clip (back clip): The machine clip is an essential accessory of the walkie-talkie, and it is equipped with special fixing screws when leaving the factory. When the user uses the screw, there will be a phenomenon of falling off, some users will randomly find a screw to screw on, no matter the length, or use a self-tapping screw. In some cases, the screw holes of the back clamp of the rear case of the machine are of through-hole type. The excessive length of the screw will damage the circuit board, and the machine will be scrapped in severe cases. The back clip of the walkie-talkie is generally marked with the size of the screw, and the back clip screw must be used as required.
  
   Most of the above introduction is about the appearance and mechanical failure of the walkie-talkie. The most common mechanical failure is the machine drop failure. The general drop failure sometimes causes the phenomenon that it does not turn on, or can be turned on and can transmit but not receive, or the receiving distance becomes closer. Observe the appearance of the machine during maintenance. LCD (liquid crystal display) If the LCD is damaged, replace the LCD with the same model if the LCD is damaged. If it does not turn on after being dropped (generally there will be a prompt sound when turning on), first check whether the power supply is normal, whether the CPU crystal pin has voltage, and use an oscilloscope to check whether it is oscillating. Similarly, if it is a receiving failure caused by a drop, please focus on checking the IF 2 local oscillator crystal and some related filters of the receiving channel. By the way, here is a breakdown caused by falling water or rain. If the user encounters such a problem, he must shut down at the first time, remove the battery, dry the water with a dry cloth, and blow dry with a hair dryer. If it is serious, it should be timely Ask professionals to disassemble the machine and do not leave it alone. Because the circuit board encounters water, the fault repair rate is low, and the scrap rate is high.

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