The transportation process ofcell phone jammeris very important

Ringing tone or a hoarse voice, audio amplification for small IC Weld, is required to reinstall or replace, do not recognize the card or sometimes do not recognize the card, power supply IC damaged must be replaced, no less part of the CPU Weld required to reinstall the CPU is displayed, if it is flip or slide of a group of cable, some photographic IC Weld or CPU cold solder joint will cause the display or display bad no services or show the "emergency call", in both cases there is a difference, if there is no service , indicating that the received signal, write data after reinstall the CPU, a small part of the damage to the CPU or IF this case do not check antenna loop (antenna switch, filters, etc.), because they are dual-band or even tri-band cell phone, If the antenna circuit (antenna switch, filters, etc.) go wrong will have at least one or two cell signal and no service will not be displayed if the "emergency call". The transportation process of cell phone jammer is very important.
Can play 112, focus on examination of the antenna circuit (antenna switch, filters, etc.) do not install card, generally short-access filter or capacitor replacement, not to play 112 transmitter problem, replace the amplifier and reinstall the CPU, a small number of IF damage to the boot screen, the main software, MP3 Memory ICs, CPU Weld. Camera crashes, software, CPU Weld or camera IC Weld, clamshell or slider, bad cable will cause camera crash to call shutdown, RF3146 power amplifier MTK cell phone, prone to call shutdown online discussion, there are many solutions, most of the changes to the matching circuit inductance or capacitance, but this method has an annoying shortcomings will receive signals in poor signal areas prone to the "emergency call". The transportation process ofcell phone jammershould be maintained well.

The best way is to not change the inductance or capacitance of the circuit, adjust the power amplifier control voltage that is lower. Amplifier control voltage, the RF3146 power control pins 18,19,20,21, linked together, and two small bypass capacitor connected between the 18, 19, 20, 21 heel motherboard string a K left some resistance (I usually waste board next to the keyboard light resistance, can current string of N, the emission current adjustment in the 330 - 380MA), generally 1 ---- 2 can, the method is Remove the power side of the foot solder drag clean, with the point of double sided tape to seal fitted with amplifier amplifier 18,19,20,21 heel board feet each cited an enameled, resistance to string. The market distribution of mobile phone jammer has been finished.
This method, although the trouble spots, but no negative effects, victorious, of course, some find the power to control resistance. Whether repair machine, the method is very important, not blindly chaotic change things, to ask the customer's use of clear judgment about the failure, after some of the key test points detection, and then hands. First to write data to avoid demolition, to rule out software problems (do backup), the judgment is IF CPU part. 26M of the output signal using the oscilloscope measured IF 31 feet over there to check the CPU part of the unit (CPU Weld majority), no signal, check the IF part of (26M, IF ICs). First to write data to avoid demolition, to rule out software problems (to do the backup). In the high-frequency filter output pin, as quoted in one day line, if the signal, antenna switch, an external antenna plug, high-frequency filter (this stuff is likely to cause weak signals, emergency calls can be short or capacitors). The market distribution ofcell phone jammeris not even.