The power of phone for the other is 30W each

The power of phone for the other is 30W each.
Transferred by the base station to mobile switching center (switchboard), it recognizes this card can provide services, the phone has begun to "Standby", then hand letter the machine's power supply, signal, control line voltage including DC voltage and alternating voltage will 1.17s, which is an important symbol of the standby, the standby transmitter is no electricity, no letter, no control. That is: In standby mode, with oscilloscope, multimeter, spectrum analyzer to measure the transmitter will not be any measured data. The second thought is: three machine corresponding to the three fault. Overall the phone is only three failures, and three "machine" corresponds to the three fault. Its name. The output of transmitter of phone is adjustable.
Can not boot, check the microcontroller with an oscilloscope to measure. The two dishes and one soup, soft and hard "formulas," hi "to see the wave. Does not sync, check letter machine, with an oscilloscope, spectrum analyzer. Check your letter of the machine's power, letters, and control signals. Do not go moving the transmitter. Can not talk. Check transmitter with an oscilloscope, spectrum analyzer. Check the transmitter power, letters, and control signals. Do not go to the moving receiver. Often said "No Signal" was renamed "signal bars" are not synchronized better, because some phones such as Motorola and Nokia series clearly has "sync", but does not appear, then many people will go to the fixed receiver, to do so will often burn incense cited ghost "Transmitter is not only "remains the same, and also a good receiver to engage in something wrong. phone is with the small size and light weight.As many details and requirements of phone should be met and satisfied
Another example is often said that "no emission" failure to make use of "do not call" better. Because the vast majority of 'no launch of the "fault plane, the measurement of transmitter power, the letter, the control signal most of some, but not normal or hope" eat ", how can you say the phone launch "? following a Nokia 8310, for example, to illustrate the process of tracking phone way of thinking and implementation process. field sent a N8310 phone can not boot, motherboard and LCD front panel disassemble found serious water mark, and the CPU, character, power / audio IC, IF IC, power amplifier Dengjun passive. phone has the high quality and perfect design.
Analysis: Based on the above measurement results, is obviously part of the power IC "hard" voltage VIO is not out of the cause can not boot. Is "a system". VCORE, the VIO is the CPU power supply, the VIO is 0V, the CPU does not work, the VPP voltage output, it not the truth. Shown in Figure 1. This time do not intend to consider 13MHZ standard frequency VR3 supply problems, this is a very special power supply must be the CPU can work properly will not come out, Now the CPU is only one VCORE power supply, less the VIO VR3 does not come out is taken for granted the.