Motorola XTS 2500 Service Manual page 15

Table of Contents
7.3.25 PP24 Low-Noise Amplifier Output........................................................................................... 7.3-26
7.3.26 PP25 Preselector 2 Output...................................................................................................... 7.3-27
7.3.27 PP26 Mixer Out (IF) ................................................................................................................ 7.3-28
7.3.28 PP27 Crystal Filter Out............................................................................................................ 7.3-29
7.3.29 PP28 Abacus Analog 3V ......................................................................................................... 7.3-30
7.3.30 PP29 2nd LO Control Voltage ................................................................................................. 7.3-31
7.3.31 PP30 2nd LO VCO Buffer Output............................................................................................ 7.3-32
7.3.32 PP31 Analog 5V DC................................................................................................................ 7.3-33
7.3.33 PP32 Abacus Digital 3V .......................................................................................................... 7.3-34
7.3.34 TX Audio 1 kHz Tone .............................................................................................................. 7.3-35
7.3.35 16.8 MHz Buffer Input and Output........................................................................................... 7.3-36
7.3.36 32.768 kHz Clock Outputs....................................................................................................... 7.3-37
7.3.37 SPI B Data............................................................................................................................... 7.3-38
7.3.38 RX Serial Audio Port (SAP)..................................................................................................... 7.3-39
7.3.39 PP33 SPI Data ........................................................................................................................ 7.3-40
7.3.40 PP34 SPI CLK......................................................................................................................... 7.3-41
7.3.41 PP35 Universal Chip Select .................................................................................................... 7.3-42
7.3.42 PP36 Abacus Chip Select ....................................................................................................... 7.3-43
7.3.43 TP37 RX SSI Data .................................................................................................................. 7.3-44
7.3.44 TP38 RX SSI Clock ................................................................................................................. 7.3-45
7.3.45 TP39 RX SSI Frame Sync....................................................................................................... 7.3-46
Chapter 7.4.4 700/800 MHz Troubleshooting Waveforms .................... 7.4-1
7.4.1 Introduction................................................................................................................................ 7.4-1
7.4.2 List of Waveforms...................................................................................................................... 7.4-1
7.4.3 RF Test Points........................................................................................................................... 7.4-2
7.4.4 Main Circuit Board RF Shield Locations.................................................................................... 7.4-4
7.4.5 PP1 Antenna Input .................................................................................................................... 7.4-6
7.4.6 PP2 TX Signal at Harmonic Filter Input..................................................................................... 7.4-7
7.4.7 PP3 Coupler RF Out ................................................................................................................. 7.4-8
7.4.8 PP4 TX Signal at PA ................................................................................................................. 7.4-9
7.4.9 TP5 Coupler RF Feedback to PCIC ........................................................................................ 7.4-10
7.4.10 TP6 PCIC Control Voltage ...................................................................................................... 7.4-11
7.4.11 PP7 TX LO .............................................................................................................................. 7.4-12
7.4.12 PP8 Higher Level Voltage Multiplier........................................................................................ 7.4-13
7.4.13 PP9 Superfilter Output ............................................................................................................ 7.4-14
7.4.14 TP10 TRB................................................................................................................................ 7.4-15
7.4.15 PP11 Prescalar Input to FracN Synthesizer............................................................................ 7.4-16
7.4.16 PP12 Reference Crystal Output .............................................................................................. 7.4-17
7.4.17 TP13 Mod In............................................................................................................................ 7.4-18
7.4.18 TP14 1st LO Control Voltage .................................................................................................. 7.4-19
7.4.19 PP15 VCO Output ................................................................................................................... 7.4-20
7.4.20 PP16 VCO RX LO ................................................................................................................... 7.4-21
7.4.21 PP17 Frequency Out (16.8 MHz) ............................................................................................ 7.4-22
7.4.22 PP18 RX RF Input at Antenna Switch..................................................................................... 7.4-23
7.4.23 PP19 Antenna Switch Bias...................................................................................................... 7.4-24
7.4.24 PP20 Preselector Tuning Voltage ........................................................................................... 7.4-25
7.4.25 PP21 RX RF Input after Antenna Switch................................................................................. 7.4-26
7.4.26 PP22 Analog 5V ...................................................................................................................... 7.4-27
7.4.27 PP23 Preselector 1 Output...................................................................................................... 7.4-28
7.4.28 PP24 Low-Noise Amplifier Output........................................................................................... 7.4-29
7.4.29 PP25 Preselector 2 Output...................................................................................................... 7.4-30
6816985H01-F
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February 14, 2012