Motorola XTS 2500 Service Manual page 16

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7.4.30 PP26 Mixer Out (IF)................................................................................................................. 7.4-31
7.4.31 PP27 Crystal Filter Out............................................................................................................ 7.4-32
7.4.32 PP28 Abacus Analog 3V ......................................................................................................... 7.4-33
7.4.33 PP29 2nd LO Control Voltage ................................................................................................. 7.4-34
7.4.34 PP30 2nd LO VCO Buffer Output............................................................................................ 7.4-35
7.4.35 PP31 Analog 5V DC ................................................................................................................ 7.4-36
7.4.36 PP32 Abacus Digital 3V .......................................................................................................... 7.4-37
7.4.37 TX Audio 1 kHz Tone .............................................................................................................. 7.4-38
7.4.38 16.8 MHz Buffer Input and Output........................................................................................... 7.4-39
7.4.39 32.768 kHz Clock Outputs....................................................................................................... 7.4-40
7.4.40 SPI B Data............................................................................................................................... 7.4-41
7.4.41 RX Serial Audio Port (SAP) ..................................................................................................... 7.4-42
7.4.42 PP33 SPI Data ........................................................................................................................ 7.4-43
7.4.43 PP34 SPI CLK ......................................................................................................................... 7.4-44
7.4.44 PP35 Universal Chip Select .................................................................................................... 7.4-45
7.4.45 PP36 Abacus Chip Select ....................................................................................................... 7.4-46
7.4.46 TP37 RX SSI Data................................................................................................................... 7.4-47
7.4.47 TP38 RX SSI Clock ................................................................................................................. 7.4-48
7.4.48 TP39 RX SSI Frame Sync....................................................................................................... 7.4-49
7.4.49 TP40 RX SSI Sync B............................................................................................................... 7.4-50
Chapter 7.5 Troubleshooting Waveforms .......................................... 7.5-1
7.5.1 Introduction................................................................................................................................ 7.5-1
7.5.2 List of Waveforms...................................................................................................................... 7.5-1
7.5.3 RF Test Points........................................................................................................................... 7.5-2
7.5.4 Main Circuit Board RF Shield Locations.................................................................................... 7.5-4
7.5.5 PP1 Antenna Input .................................................................................................................... 7.5-6
7.5.6 PP2 TX Signal at Harmonic Filter Input..................................................................................... 7.5-7
7.5.7 PP3 Coupler RF Out.................................................................................................................. 7.5-8
7.5.8 PP4 TX Signal at PA ................................................................................................................. 7.5-9
7.5.9 TP5 Coupler RF Feedback to PCIC ........................................................................................ 7.5-10
7.5.10 TP6 PCIC Control Voltage....................................................................................................... 7.5-11
7.5.11 PP7 TX LO .............................................................................................................................. 7.5-12
7.5.12 PP8 Higher Level Voltage Multiplier ........................................................................................ 7.5-13
7.5.13 PP9 Superfilter Output............................................................................................................. 7.5-14
7.5.14 TP10 TRB................................................................................................................................ 7.5-15
7.5.15 PP11 Prescalar Input to FracN Synthesizer ............................................................................ 7.5-16
7.5.16 PP12 Reference Crystal Output .............................................................................................. 7.5-17
7.5.17 TP13 Mod In ............................................................................................................................ 7.5-18
7.5.18 TP14 1st LO Control Voltage................................................................................................... 7.5-19
7.5.19 PP15 VCO Output ................................................................................................................... 7.5-20
7.5.20 PP16 VCO RX LO ................................................................................................................... 7.5-21
7.5.21 PP17 Frequency Out (16.8 MHz) ............................................................................................ 7.5-22
7.5.22 PP18 RX RF Input at Antenna Switch ..................................................................................... 7.5-23
7.5.23 PP19 Antenna Switch Bias...................................................................................................... 7.5-24
7.5.24 PP20 Preselector Tuning Voltage ........................................................................................... 7.5-25
7.5.25 PP21 RX RF Input after Antenna Switch................................................................................. 7.5-26
7.5.26 PP22 Analog 5V ...................................................................................................................... 7.5-27
7.5.27 PP23 Preselector 1 Output...................................................................................................... 7.5-28
7.5.28 PP24 Low-Noise Amplifier Output ........................................................................................... 7.5-29
7.5.29 PP25 Preselector 2 Output...................................................................................................... 7.5-30
7.5.30 PP26 Mixer Out (IF)................................................................................................................. 7.5-31
February 14, 2012
Table of Contents
6816985H01-F