Motorola T720 - Motorola T720 User Guide Overview; Understanding Phone Controls; Headset Jack; Volume Controls

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Contents
T720
Product Description
…………………………………
6
Power Amplifier…………………………………….……..
20
Concept of T720…………………………….………..
6
Theory of Operation……………………………………..
20
T720 IC Description………………………………….
6
Receiver Section……………………………………..……
20
Non Qualcomm IC’s………………………………….
6
Transmitter Section……………………………………….
21
Testing and troubleshooting GPS…………………. 6 Frequency Synthesizer Section…………………………. 21
CDMA Dual Band Trimode Phone………………… 7
Receiver Audio……………………………………………
22
General…………………………………………………
7
Transmitter Audio…………………………………………
22
Advantages of CDMA 1X………………………….. 7
RF Side Block Diagram…………………………………..
23
Key Product Features………………………………..
8
Accessory Conncetor……………………….……….
8 Disassembly Procedure
…………………………….……
25
T720 Audio Logic IC's……………………………….
8
Introduction……………………………………………….
25
Brief IC functional description………………………
8
Removing battery…………………………………………
25
CDMA-PCS 1900 Mhz Band………………………..
10
Disassembly Procedure…………………………………..
28
Specifications…………….…………………………..
10
Removing flip Assembly…………………………………
36
Environmental…………………...…..………….…….
13
Foreward………………………………….……………
14 Product Support Tools
…………………………………..
41
Scope of Manual…………….………………..……..
14 Flashing and Flexing / NAM programming……….…… 41
Replacement parts ordering…………………………
14
About junior board operation……………………………
41
Serivce…………………………………….……..…….
14 Junior box setup………………………………………. 42
Genaral Safety Information……….…………………
15
Test and Phasing………………………………………….
43
Portable Operation………………….………….…….
15
Mobile Operation……………….……………..……..
15
Test Procedure
……………………………………………
44
RF cable test……………………………………………….
44
Cellular Overview
………………………...………….
16 To test the RF cable for proper loss……………………. 44
Overall Concept………………………………………
16
Setup for Analog Call…………………………………….
45
Hypothetical Cell System……………………………
17
Registration………………………………………………..
45
Operation………………………………………………
17
Page…………………………………………………………
45
Service Area…………………………………………..
17
Origination…………………………………………………
45
PCS System……………………………………………
17
RX Sensitivity Test (SINAD)……………………..……..
46
TX power out test…………………………………………
47
TX maximum deviation…………………………………..
49
Circuit Description & Theory of operation
………
17
TX SAT Deviation test…………………………….…….
50
Baseband or Audio Logic Section…………………. 18
TX ST Deviation test……………………………………..
51
Basic Features………………………………………..
18
Setup for CDMA Call…………………………………….
52
RF Interface……………………………………………
18
Making a CDMA phone Call…………………………….
53
Clock Support…………………………………………
18 Setup for CDMA RF parametric Measurements………. 54
Audio Features……………………………………….
18 Making a Receiver Sensitivity Measurement…………. 55
RF Section…………………………………………….
19
Receiver Test Termination……………………….………
56
IFR3300…………………………...……………………
19
CDMA Transmitter Test…………………………………
57
RFT3100……………………………………………….
20 CDMA Transmitter Power Range test…………….…… 58
VCO / PLL Module……………………………………
20
FER with AWGN tests……………………………………
59
Reference Oscillator………………………………….
20
NAM Programming procedure……………….…….……
60
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