Motorola ASTRO MT 1500, Service Manual

Page: 333 / 817

6816985H01-B August 16, 2007
UHF1 Troubleshooting Waveforms: RF Test Points 7.2-3
Table 7.2-2. RF Block Diagram Probe/Test Points
PP/TP Name Location
Under RF
Shield?
Page
1 Antenna Input J101, pin 5 No. 7.2-6
2 TX Signal at Harmonic Filter Input C192 Yes. 7.2-7
3 Coupler RF Out U103, pin 1 No. 7.2-8
4 TX Signal at PA Q101, pin 3 No. 7.2-9
5 Coupler RF Feedback to PCIC TP160 No. 7.2-10
6 PCIC Control Voltage TP_146 No. 7.2-11
7 TX LO R289 No. 7.2-12
8 Higher Level Voltage Multiplier C210 Yes. 7.2-13
9 Superfilter Output SF_TP Yes. 7.2-14
11 Prescalar Input to FracN Synthesizer TP23 Yes. 7.2-15
12 Reference Crystal Output R729 and C726 No. 7.2-16
13 Mod In TP36 No. 7.2-17
14 1st LO Control Voltage VC_TP No. 7.2-18
15 VCO Output R266(Rx), R289(Tx) and
TP23(prescaler)
Yes. 7.2-19
17 Frequency Out (16.8 MHz) 16out No. 7.2-21
18 RX RF Input at Antenna Switch D20, Pin 1 No. 7.2-22
20 Preselector Tuning Voltage C139 No. 7.2-24
22 Analog 5V U500, pin 5 No. 7.2-25
23 Preselector 1 Output U2, Pin 3 Yes. 7.2-26
24 Low-Noise Amplifier Output C35 Yes 7.2-27
25 Preselector 2 Output TPOO Yes 7.2-28
26 Mixer Out (IF) T53, Pin 4 Yes. 7.2-29
27 Crystal Filter Out R38 Yes 7.2-30
28 Abacus Analog 3V U501, pin 5 No. 7.2-31
29 2nd LO Control Voltage U401, pin 38 Yes. 7.2-32
30 2nd LO VCO Buffer Output C433 Yes. 7.2-33
31 Analog 5V U500, pin 5 No. 7.2-34
32 Abacus Digital 3V U502, pin 5 No. 7.2-35
33 SPI Data R802 No. 7.2-41
34 SPI CLK R803 No. 7.2-42
35 Universal Chip Select U102, pin 29 No 7.2-43
36 Abacus Chip Select U401, pin 25 Yes. 7.2-44
37 RX SSI Data SSI_D No. 7.2-45