It is the figure of cell phone jammer

But this lost cause the device to open and close the flip automatically answer and automatically turn off the phone function. Samsung A188 cell phone flip circuit using Hawk components, when the flip is closed, the magnetic field in the cover in the Hawke sensor U2, Hall sensor circuit transistor turn-on, one foot from the sensor output low. During a call, they hang up signal sent to the microprocessor hang up. When opening the flip, the Hall sensor is not sensitive to magnetic fields, Hawk sensor circuit transistor cut-off, a pin output level is high, the change of the pulse voltage (FLIP-SNS) is added to the motherboard CPU-U201 the D5 feet. So the CPU command phone connected to the phone or open the backlight. The biggest problem for the school to consider and avoid is prevent others breaking, turning off or even damaging   phone jammer   .
The other flip or folding phone, such as the Samsung A288, Ericsson T28, Motorola V series mobile phones and other analysis and maintenance can also be carried out in accordance with the above method, if the failure to occur. Launch shutdown. Phone launch the shutdown problem often during maintenance, mainly come from the following reasons. First, the battery voltage is too low or the battery aging. Changed adequate battery-powered battery voltage is too low to cause the phenomenon of emission shutdown, normal can be judged mining. The failure of a miscarriage of justice is due to the aging of the battery lead to launch the shutdown, often encountered in the battery indicator is still full grid, but the emission shutdown.
If the software is set low power alarm threshold voltage is too high, also have a low voltage alarm fault. Overhaul, just rewrite the correct information you can. The battery-powered load circuit leakage. If the battery power supply load circuits such as amplifiers and other large leakage current will pull down the battery voltage, causing the low power alarm. Amplifier circuit is damaged the most important feature is to press the launch button to appear current. This and other reasons are different. The fourth quarter of mobile phone maintenance of the leakage fault. Phone leakage fault repair methods. Mobile leakage is not boot key to the mobile phone with a DC power supply, ammeter pointer there standby current in the current direction or the phone is switched on. Therefore, the selection and use of the anti-damage  phone jammer   can well solve this problem.
Under normal circumstances, the phone does not boot ammeter indicated value should OmA, the standby current is 5 ~ 30mA, the maximum should not exceed 50mA. Reaction of some mobile phone users own mobile phone battery consumption, the fully charged battery with long before the occurrence of low power alarm or automatic shutdown, this failure occurs more commonly due to leakage for the phone. Leakage serious mobile phone will result in boot failure. Leakage failure is generally due to poor supply manifold block or a component of short-circuit phenomenon, the mobile phone into the water is prone to leakage fault leakage troubleshooting more difficult, overhaul, the following three methods can be used for the analysis and judgment  phone jammer  . To the mobile phone power supply a few minutes, and then touch the suspicious elements, the fever is not normal components is faulty.