Rf Test Points; Figure 7.5-1. Rf Block Diagram Test Points - Motorola XTS 2500 Service Manual

7.5-2

7.5.3 RF Test Points

The following RF block diagram and accompanying table
probe points (PP) and test points (TP) for the XTS 2500 radio.
5
Coupler
Detector
3
4
Antenna
Switch
TX
2
1
Harmonic
Filter
19
20
18
Antenna
Preselector #1
21
Switch
(Tunable)
Test Points Not Shown
33
SPI Data 37 SSI Data
34 38
SPI Clock SSI Clock
39
35
Chip Select SSI FS
36 40
Abacus CS SSI Sync B
February 14, 2012
PCIC
6
Power
Amplifier
Capacitive
Multiplier
8
16.8MHz
12 LV-FractN
Crystal
Synthesizer
13
DAC
Preselector #2
25
(Fixed)
22
24
23
5V DC
5V DC

Figure 7.5-1. RF Block Diagram Test Points

Troubleshooting Waveforms: RF Test Points
(Table 7.5-2) shows the location of key
7
TRB
Level
Shifter
10
11
Buffer
9 VCO
Output
15
Buffer IC
Match
14
VCO
Crystal
26
Mixer
Filter
RF
Amplifier
31
Abacus 3V
Regulator
Legend
RF
Bias
DC
Probe/Test Point
#
17
Abacus 3 32
27
3V DC
Sampling
29
Clock
Tank
28
30
2nd LO
VCO
MAEPF-27353-O
6816985H01-F