PX8700
LG Electronics Inc.
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2. Digital/Voice Processing Part
2.1 Overview
The digital/voice processing part processes the user's commands and processes all the digital and voice signal
processing in order to operate in the phone. The digital/voice processing part is made up of a keypad/LCD,
receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.
2.2 Configuration
2.2.1 Keypad/LCD and Receptacle Part
This is used to transmit keypad signals to MSM6550. It is made up of a keypad backlight part that illuminates
the keypad, LCD part that displays the operation status onto the screen, and a receptacle that receives and sends
out voice and data with external sources.
2.2.2 Voice Processing Part
The voice processing part is made up of an audio codec used to convert MIC signals into digital voice signals
and digital voice signals into analog voice signals, amplifying part for amplifying the voice signals and sending
them to the ear piece, amplifying part that amplifies ringer signals coming out from MSM6550, and amplifying
part that amplifies signals coming out from MIC and transferring them to the audio processor.
2.2.3 MSM (Mobile Station Modem) 6500 Part
MSM is the core elements of CDMA terminal and carries out the functions of CPU, encoder, interleaver,
deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.
2.2.4 Memory Part
The memory part is made up of a NAND Flash memory and a SDRAM for storing data.
2.2.5 Power Supply Part
The power supply part is made up of circuits for generating various types of power, used for the digital/voice
processing part.
Содержание PX8700
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Страница 53: ...PX8700 LG Electronics Inc 53 Circuit Diagram Waveform SBCK0 SBCK0 SBST0 SBDT0 Graph 4 1 2 c Graph 4 1 2 d ...
Страница 55: ...PX8700 LG Electronics Inc 55 Waveform Graph 4 1 2 e Graph 4 1 2 f U103 Pin U104 Pin Graph 4 1 2 g DP101 Pin ...
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Страница 62: ...PX8700 LG Electronics Inc 62 Circuit Diagram RFT6150 PMIC 2 9V_TX 2 6V_MSMP2 circuit ...
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Страница 90: ...4 3 1 2 Charging Trouble Circuit Diagram Test Points V_BATT Pin1 CON401 U402 ...
Страница 96: ...4 3 4 Audio 4 3 4 1 Speaker Trouble Test Points Circuit Diagram C113 U106 R144 U103 C112 C110 L103 ...
Страница 98: ...4 3 4 2 Receiver Trouble Test Points Circuit Diagram R314 U305 R315 C338 ...
Страница 100: ...4 3 4 4 Headset Trouble Circuit Diagram Test Points CON402 R405 R416 R415 C116 C115 ...
Страница 103: ...4 3 4 3 Mic Trouble Circuit Diagram Test Points R126 M101 ...
Страница 108: ...4 3 6 2 Micro SD Detect Circuit Diagram PMIC Test Points CON105 C140 C141 C138 C136 C313 C142 C139 C137 U302 ...
Страница 110: ...4 3 6 3 USB Interface Circuit Diagram U201 MSM6550 U302 Test Points R307 X202 R306 L302 C314 ...
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