Common fault judgment and maintenance of intercom

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  • 上传时间:2021-07-29

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Intercom maintenance some of the daily use of the most common faults and the correct use of some simple introduction, for intercom users reference.

1. Antenna: Antenna is the most critical component of the whole transceiver. Once the antenna fails or is bad, it will affect the transceiver communication effect. Users often use the hand antenna to drive the whole walkie talkie in use, more serious is in the antenna tail swing walkie talkie. Due to the launch of the inward and outward mouth machine is high frequency receiving antennas, often use is professional, TNC, BNC, SMA interface at this time due to the mechanical strength of the antenna, antenna skin fall off over time, the antenna fracture, needle needle or antenna interface is smaller, serious when they make the antenna and the circuit connection between needle desoldering. At this time, the machine transmitting standing wave has become larger, in the case of continuous work, some of the machines with poor protection measures will produce power tube, power amplifier module burning or power resistance burning circuit failure, the user will generally be unable to receive the case will be repaired. It is recommended that you master the correct use method during normal use, and often check whether the connection between the antenna and antenna base is reliable, whether the antenna is black or dirty, and whether the antenna appearance is damaged. If the antenna and antenna base are damaged, it is recommended to replace the antenna and antenna base of the same model.

Two, battery: battery is the source of energy supply to the whole machine. Due to the high current when the intercom is transmitting, the disposable alkaline battery is used less. Most interphones are rechargeable nickel-cadmium, nickel-metal hydride, or lithium-ion batteries. Often there will be users put forward that the battery life is not long enough, just charged (PTT) did not press a few times to run out of power, in addition to the individual operators using inferior battery, affect the normal use, the correct way to use is to extend the battery life and life. According to the survey and user inquiry, some users will put it in the charger for a random period of time when they want to use it, and then use it without regular charging and discharging. Because the charge and discharge of nickel-cadmium battery has the characteristics of memory, it will produce the phenomenon of insufficient charge. There are some users who do not use the machine for a long time will put the battery on the charging seat. You should know that many simple chargers on the market are not full of hints and protection circuit, so that a long time will form battery overcharge, serious when the battery is discarded. Users who use lithium-ion batteries are usually equipped with professional lithium battery chargers, but users are advised to charge them after each charging cycle. Although lithium battery has no memory characteristics, its capacity will be greatly reduced after two to three hundred charging and discharging cycles.

In addition, some machines due to different use environment, or battery quality problems, leakage, machine and battery contact will produce oxidation, corrosion, resulting in poor contact between battery and machine, serious do not turn on. This phenomenon can generally be seen from the surface, the light can be used to clean the blade and then use, serious corrosion of the battery recommended scrapping, machine repair.

Three, PTT(launch button) : the launch button is the part with the highest frequency in daily use. In some repair machines, it is found that part of the machine is the aging or damage of the rubber outside the launch key, which affects the normal use. Some affect the buttons on the circuit board, there are bad button contact, button failure and other faults, the best maintenance and the original machine with the same model of the device.

Four, the power switch, static and manic potentiometer, stepping potentiometer: the power switch in the intercom and the volume potentiometer are generally integrated, there are a part of low-end machines using device quality problems, can switch the power supply, but the volume adjustment has problems. You are advised to replace an excellent component of the same model. Static and manetic potentiometer repeatedly adjust less opportunity, but need to work in a specific position, some users afraid of adjustment trouble, simply use glue to stick, so to future maintenance buried hidden trouble. Step potentiometer is used to convert channel and use when manual programming, good potentiometer feel is very good, clear between the steps when rotation, will not have smooth feeling. Some machines will damage the potentiometer shaft when falling, so that it can not change the channel and programming, repair can only replace the new parts. At present, some machines use button switches. This type of machine should pay attention to the change of conductivity after a long time. Sometimes cause not to start, or repeatedly press several times to start, maintenance should be considered to clean the keyboard and circuit board.

Five, conductive keyboard: most of the walkie-talkies are equipped with DTMF keyboard and programming keys. In the machine for repair, it was found that the keyboard was damaged, greasy, some keys fell off, rats, cockroaches bite. Such faults need only be cleaned or replaced.

Six, the speaker (speaker) : the speaker is the key component of the intercom, some users like to open the volume to the largest, some machine audio power amplifier and the speaker match is not designed very well will burn the speaker. There are some special environment users, with a period of time the sound of the speaker is getting smaller and smaller, the maintenance found that there are a lot of iron powder on the horn sound film, the iron powder can be completely cleaned up.

Seven, audio components (headset) : some users due to the work relationship will use headphones and other external accessories, audio plug is generally connected by special plug and socket, over time will produce poor socket contact or unwelding, because the socket is generally with a broken contact point, at this time will produce bad fault reception. It is recommended to replace a good socket during maintenance.

8. Machine clip (back clip) : machine clip is the necessary accessory of intercom, it is equipped with special fixed screws when leaving the factory. When the user is in use, there will be the phenomenon of the screw falling off. Some users will casually find a screw regardless of the length, and use self-tapping screws. Some machine shell back clip screw hole is through hole type, screw long will damage the circuit board, serious when the machine will be scrapped. Intercom back clip is generally marked with screw size, such as: M3X5mm screw diameter 3 mm, 5mm length, must be required to use the back clip screw.

Most of the above is about the appearance and mechanical faults of the intercom. Mechanical faults most often occur and machine fall fault, general fall fault sometimes will not start, or can start can launch but not receive, or receive distance becomes close, inspection and maintenance of the appearance of the machine, LCD (LIQUID crystal display) is damaged, LCD damage generally replace the same type of LCD can be. After the drop caused by no boot (boot is generally prompt sound) generally check whether the power supply is normal, CPU crystal foot is voltage, voltage with oscilloscope to detect whether the vibration, if not vibration, is generally damaged crystal, crystal replacement. Similarly, if the receiving fault is caused by a drop, please check the intermediate frequency two local oscillator crystal and some relevant filters of the receiving channel. Here by the way to mention the water or rain caused by the fault, the user encounter such problems, must be in the first time to shut down, remove the battery, dry with dry cloth, dry with hair dryer, serious should be timely please professional disassembly processing, do not delay. Because the circuit board water caused by the failure repair rate is low, high scrap rate.

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