Table Of Contents - Motorola T720 Service Manual

M
Product Description....................................... 6
Concept of T720............................................. 6
T720 IC Description........................................ 6
Non Qualcomm IC's........................................ 6
Testing and troubleshooting GPS...................... 6
CDMA Dual Band Trimode Phone..................... 7
General......................................................... 7
Advantages of CDMA 1X................................ 7
Key Product Features...................................... 8
Accessory Conncetor...................................... 8
T720 Audio Logic IC's..................................... 8
Brief IC functional description...........................8
CDMA-PCS 1900 Mhz Band.............................10
Specifications................................................ 1 0
Environmental................................................. 13
Foreward....................................................... 14
Scope of Manual............................................ 14
Replacement parts ordering.............................. 14
Serivce.......................................................... 14
Genaral Safety Information...............................15
Portable Operation..........................................15
Mobile Operation............................................ 1 5
Cellular Overview........................................... 16
Overall Concept............................................. 16
Hypothetical Cell System.................................17
Operation...................................................... 17
Service Area.................................................. 17
PCS System................................................... 17
Circuit Description & Theory of operation......... 17
Baseband or Audio Logic Section...................... 18
Basic Features...............................................18
RF Interface................................................... 18
Clock Support................................................ 18
Audio Features..............................................18
RF Section.................................................... 19
IFR3300......................................................... 1 9
RFT3100....................................................... 20
VCO / PLL Module.......................................... 20
Reference Oscillator........................................ 2 0
Power Amplifier................................................... 20
Theory of Operation............................................ 20
Receiver Section.................................................. 20
Transmitter Section.............................................. 2 1
Frequency Synthesizer Section............................... 21
Receiver Audio................................................... 22
Transmitter Audio................................................ 22
RF Side Block Diagram......................................... 2 3
Disassembly Procedure........................................ 25
Introduction....................................................... 2 5
Removing battery................................................ 25
Disassembly Procedure.........................................28
Removing flip Assembly.......................................36
Product Support Tools......................................... 4 1
Flashing and Flexing / NAM programming................ 41
About junior board operation................................. 41
Junior box setup.............................................. 42
Test and Phasing................................................. 4 3
Test Procedure................................................... 44
RF cable test....................................................... 44
To test the RF cable for proper loss......................... 44
Setup for Analog Call........................................... 4 5
Registration........................................................ 45
Page.................................................................. 4 5
Origination......................................................... 45
RX Sensitivity Test (SINAD).................................. 46
TX power out test................................................ 47
TX maximum deviation......................................... 4 9
TX SAT Deviation test.........................................50
TX ST Deviation test............................................ 5 1
Setup for CDMA Call........................................... 5 2
Making a CDMA phone Call..................................53
Setup for CDMA RF parametric Measurements.......... 54
Making a Receiver Sensitivity Measurement............. 55
Receiver Test Termination.....................................56
CDMA Transmitter Test.......................................57
CDMA Transmitter Power Range test...................... 58
FER with AWGN tests.......................................... 59
NAM Programming procedure................................60
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Contents
T720