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4.5.4 Checking PAM Block
PAM control signal
PAM IN/OUT Signal
4. TROUBLE SHOOTING
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PA_ON
TX_AGC_ADJ
PA_ON must be HIGH(over 2.5V)
PA_FET_N must be LOW if the max Tx power is set (lower than 0.5V)
PAM_IN
PAM_OUT
PAM OUT must be over 16dBm
PAM IN must be over -5dBm
PA_ON : WCDMA Tx Power Detect IC(HDET) Enable
TX_AGC_ADJ : WCDMA Tx Power Amp Gain Control
Содержание U880
Страница 1: ...Date November 2005 Issue 1 0 Service Manual Model U880 Service Manual U880 ...
Страница 20: ...3 TECHNICAL BRIEF 21 ...
Страница 32: ...3 TECHNICAL BRIEF 33 Figure 3 5 6 1 GSM PA functional block diagram ...
Страница 35: ...3 TECHNICAL BRIEF 36 Figure 3 5 10 1 Bluetooth system architecture ...
Страница 50: ...3 TECHNICAL BRIEF 51 Figure 3 10 3 2 1 PM6650 Functional Block Diagram ...
Страница 110: ...4 TROUBLE SHOOTING 111 R605 R606 receiver signal serial resistor Receiver CN600 50pin LCD connector FPCB for LCD Module ...
Страница 112: ...4 TROUBLE SHOOTING 113 R605 R606 receiver signal serial resistor CN600 50pin LCD connector CN901 C907 C911 ...
Страница 114: ...4 TROUBLE SHOOTING 115 Loud Speaker U502 U503 Amp ...
Страница 118: ...4 TROUBLE SHOOTING 119 C200 C201 for MIC serial capacitor ...
Страница 121: ...4 TROUBLE SHOOTING 122 Q404 Q403 Q402 VBATT GND ...
Страница 128: ...5 DOWNLOAD 129 5 Choose a Module Image file after clicking on the Browse button ...
Страница 132: ...5 DOWNLOAD 133 Downloading the AMSS Modem image Rebooting and waiting for a while Performing NV restore ...
Страница 134: ...5 DOWNLOAD 135 Download of Module image in progress Download process has completed successfully ...
Страница 143: ...6 BLOCK DIAGRAM 144 6 3 Interface Diagram U880 Interface Diagram ...
Страница 145: ... 146 ...
Страница 154: ... 155 8 PCB LAYOUT ...
Страница 155: ... 156 8 PCB LAYOUT ...
Страница 156: ... 157 8 PCB LAYOUT ...
Страница 157: ... 158 8 PCB LAYOUT ...
Страница 158: ... 159 8 PCB LAYOUT ...
Страница 159: ... 160 8 PCB LAYOUT ...
Страница 166: ...9 CALIBRATION 167 Click START button U880 U880_ver1 1 U880 U880 Click U880 ...
Страница 167: ... 168 ...
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Страница 196: ...Note ...
Страница 197: ...Note ...