Table 7.3-2. Rf Block Diagram Probe/Test Points - Motorola XTS 2500 Service Manual

UHF2 Troubleshooting Waveforms: RF Test Points
PP/TP Name
1 Antenna Input
2 TX Signal at Harmonic Filter Input
3 Coupler RF Out
4 TX Signal at PA
5 Coupler RF Feedback to PCIC
6 PCIC Control Voltage
7 TX LO
8 Higher Level Voltage Multiplier
9 Superfilter Output
11 Prescalar Input to FracN Synthesizer
12 Reference Crystal Output
13 Mod In
14 1st LO Control Voltage
15 VCO Output
17 Frequency Out (16.8 MHz)
18 RX RF Input at Antenna Switch
20 Preselector Tuning Voltage
22 Analog 5V
23 Preselector 1 Output
24 Low-Noise Amplifier Output
25 Preselector 2 Output
26 Mixer Out (IF)
27 Crystal Filter Out
28 Abacus Analog 3V
29 2nd LO Control Voltage
30 2nd LO VCO Buffer Output
31 Analog 5V
32 Abacus Digital 3V
33 SPI Data
34 SPI CLK
35 Universal Chip Select
36 Abacus Chip Select
37 RX SSI Data
6816985H01-F

Table 7.3-2. RF Block Diagram Probe/Test Points

Location
J101, pin 5
C192
U103, pin 1
Q101, pin 3
TP160
TP_146
R289
C210
SF_TP
TP23
R729 and C726
TP36
VC_TP
R266(Rx), R289(Tx) and
TP23(prescaler)
16out
D20, Pin 1
R1 and R2
U500, pin 5
C5
C12
C18
L72
L55
U501, pin 5
U401, pin 38
C433
U500, pin 5
U502, pin 5
R802
R803
U102, pin 29
U401, pin 25
SSI_D
7.3-3
Under RF
Page
Shield?
No. 7.3-6
Yes. 7.3-7
No. 7.3-8
No. 7.3-9
No. 7.3-10
No. 7.3-11
No. 7.3-12
Yes. 7.3-13
Yes. 7.3-14
Yes. 7.3-15
No. 7.3-16
No. 7.3-17
No. 7.3-18
Yes. 7.3-19
No. 7.3-20
No. 7.3-21
No. 7.3-23
No. 7.3-24
Yes. 7.3-25
Yes 7.3-26
Yes 7.3-27
Yes. 7.3-28
Yes 7.3-29
No. 7.3-30
Yes. 7.3-31
Yes. 7.3-32
No. 7.3-33
No. 7.3-34
No. 7.3-40
No. 7.3-41
No 7.3-42
Yes. 7.3-43
No. 7.3-44
February 14, 2012