Motorola XTS 2500 Service Manual page 14

xiv
7.2.20 PP18 RX RF Input at Antenna Switch ..................................................................................... 7.2-22
7.2.21 PP19 Antenna Switch Bias...................................................................................................... 7.2-23
7.2.22 PP20 Preselector Tuning Voltage ........................................................................................... 7.2-24
7.2.23 PP22 Analog 5V ...................................................................................................................... 7.2-25
7.2.24 PP23 Preselector 1 Output...................................................................................................... 7.2-26
7.2.25 PP24 Low-Noise Amplifier Output ........................................................................................... 7.2-27
7.2.26 PP25 Preselector 2 Output...................................................................................................... 7.2-28
7.2.27 PP26 Mixer Out (IF)................................................................................................................. 7.2-29
7.2.28 PP27 Crystal Filter Out............................................................................................................ 7.2-30
7.2.29 PP28 Abacus Analog 3V ......................................................................................................... 7.2-31
7.2.30 PP29 2nd LO Control Voltage ................................................................................................. 7.2-32
7.2.31 PP30 2nd LO VCO Buffer Output............................................................................................ 7.2-33
7.2.32 PP31 Analog 5V DC ................................................................................................................ 7.2-34
7.2.33 PP32 Abacus Digital 3V .......................................................................................................... 7.2-35
7.2.34 TX Audio 1 kHz Tone .............................................................................................................. 7.2-36
7.2.35 16.8 MHz Buffer Input and Output........................................................................................... 7.2-37
7.2.36 32.768 kHz Clock Outputs....................................................................................................... 7.2-38
7.2.37 SPI B Data............................................................................................................................... 7.2-39
7.2.38 RX Serial Audio Port (SAP) ..................................................................................................... 7.2-40
7.2.39 PP33 SPI Data ........................................................................................................................ 7.2-41
7.2.40 PP34 SPI CLK ......................................................................................................................... 7.2-42
7.2.41 PP35 Universal Chip Select .................................................................................................... 7.2-43
7.2.42 PP36 Abacus Chip Select ....................................................................................................... 7.2-44
7.2.43 TP37 RX SSI Data................................................................................................................... 7.2-45
7.2.44 TP38 RX SSI Clock ................................................................................................................. 7.2-46
7.2.45 TP39 RX SSI Frame Sync....................................................................................................... 7.2-47
Chapter 7.3 UHF2 Troubleshooting Waveforms ................................ 7.3-1
7.3.1 Introduction................................................................................................................................ 7.3-1
7.3.2 List of Waveforms...................................................................................................................... 7.3-1
7.3.3 RF Test Points........................................................................................................................... 7.3-2
7.3.4 Main Circuit Board RF Shield Locations.................................................................................... 7.3-4
7.3.5 PP1 Antenna Input .................................................................................................................... 7.3-6
7.3.6 PP2 TX Signal at Harmonic Filter Input..................................................................................... 7.3-7
7.3.7 PP3 Coupler RF Out.................................................................................................................. 7.3-8
7.3.8 PP4 TX Signal at PA ................................................................................................................. 7.3-9
7.3.9 TP5 Coupler RF Feedback to PCIC ........................................................................................ 7.3-10
7.3.10 TP6 PCIC Control Voltage....................................................................................................... 7.3-11
7.3.11 PP7 TX LO .............................................................................................................................. 7.3-12
7.3.12 PP8 Higher Level Voltage Multiplier ........................................................................................ 7.3-13
7.3.13 PP9 Superfilter Output............................................................................................................. 7.3-14
7.3.14 PP11 Prescalar Input to FracN Synthesizer ............................................................................ 7.3-15
7.3.15 PP12 Reference Crystal Output .............................................................................................. 7.3-16
7.3.16 TP13 Mod In ............................................................................................................................ 7.3-17
7.3.17 TP14 1st LO Control Voltage................................................................................................... 7.3-18
7.3.18 PP15 VCO Output ................................................................................................................... 7.3-19
7.3.19 PP17 Frequency Out (19.2 MHz) ............................................................................................ 7.3-20
7.3.20 PP18 RX RF Input at Antenna Switch ..................................................................................... 7.3-21
7.3.21 PP19 Antenna Switch Bias...................................................................................................... 7.3-22
7.3.22 PP20 Preselector Tuning Voltage ........................................................................................... 7.3-23
7.3.23 PP22 Analog 5V ...................................................................................................................... 7.3-24
7.3.24 PP23 Preselector 1 Output...................................................................................................... 7.3-25
February 14, 2012
Table of Contents
6816985H01-F