In many cases the fault of the radiobut is not connected with the failure of some parts, and bad contacts in the power supply circuit. If the receiver shows no signs of life, then the Troubleshooting should begin with checking the supply chains.
Most modern radios connected to the road network or work through the power supply from the mains of 220 V. With a tester (multimeter) check whether the receiver supply voltage. To do this, first disconnect the power cord and check whether the necessary voltage on its connector. If supplied, open the radio, connect the power and check the circuit to the switch and after it. Very often it is faulty power switch.
If the receiver turns on, but does not accept the radio for repair you will need its concept. As all now produced by electronic equipment comes without a schema, it will have to find on the Internet. Type in the search bar the exact name of your receiver and the word "concept". A chance to find it.
The scheme is found, you can begin to troubleshoot it. Turn the knob and listen to, whether coming from a speaker some sounds – noises, crackling etc. If so, it speaks about the serviceability of the output of the sound stages (low frequency amplifier). So the fault is on the section from the antenna to the amplifier bass.
Carefully check the antenna – ferrite rod with a wound on it a coil. Inspect the transmission range switch, it could be a bad contact. Check on / off the receiver everything switch circuit, if necessary disassemble it and clean the contacts.
If the antenna and switch in order for further work you will need high-impedance headphones, for example, TONE-2 or any other with a resistance above 1000 Ohms. We will study the concept, look for a high-frequency amplifier stages – that they are fed from the antenna the received signal. Maybe failed one of their elements. Connecting to headphones thin probes, one of them touch the common wire ("ground"), and the second collector of the transistor check the cascade.
The advent of sound in the headphones suggests that this part of the circuit of the receiver is OK. Check the following cascade – if no sound, look for a fault it is necessary in this area. Most often, the defective transistor of the cascade or one of the capacitors.
Capacitors in electronic equipment fail quite often, so always pay attention to their appearance. Swollen capacitors, or dried drips of electrolyte need to be replaced. Failure of the filter capacitors of the power to speak a large current consumption.
Advice 2: How to repair beep
Despite the fact that an audible signal in the car can be used only in cases of extreme necessity, it should always be serviceable. If a failure has occurred, need not go to the service. Such damage you can try to fix it myself.
You will need
- - multimeter;
- - tools (screwdriver, wrench, etc.);
- - new details.
As a rule, the failure of a sound signal of the car or realize the binding check, or breakage, or damaged relay switching signals. Accordingly, it is first necessary to determine the type of failure.
Check the continuity of all wires. To do this, remove the alarm panel, gently pull out the mechanism and start the test. The wires should be intact, without any damage to the winding. Any crack or crease is a reason to replace it, because sooner or later this fault will be felt.
The next step is to check the relay and switch. You can verify the integrity of transactions or directly by the buttons of the horn, either visually or with a multimeter. Check the entire chain gradually. First relay clicks on - they have to be heard. Next, determine whether the supplied voltage to the signal. It is quite simple - connect a multimeter to the signal and hit the horn. If no sound, it does not mean that it hasn't broken down completely. First, a little stir mechanism maybe the cause of failure is trivial rust. It happens, if it affects the attachment.
If the item is still very new, buy new and just replace it. Such spare parts sold in any specialty shop or market. Carefully Unscrew the broken piece, remove it from the General mechanism. In its place insert the new, and secure. Connect all the necessary contacts.
It so happens that the signal is, but it sounds very quiet or hoarse. This indicates that the problem originated in the battery that feeds the horn. If it is almost village, change it to new one. In the case when the charge it is sufficient, but the sound is very weak, start repair. To do this, take the screw, connect it to the lever of adjustment of a sound signal and begin to rotate it in different directions, checking the sound.
When you collect the signal back, do it very carefully. It is important at the time of Assembly to properly install the gasket between the membrane and the device. Need to save a certain provided by the manufacturer, the gap between the core and the armature in the device.