Tx Rf (Vhf And Uhf Range 2) - Motorola ASTRO XTS 5000 Detailed Service Manual

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5.15 TX RF (VHF and UHF Range 2)—Page 1
No or low
TX power
Place XCVR and VOCON
into the analysis fixture.
Key up. Measure RF
power at antenna port
TX
power OK?
No
Use a spectrum analyzer
and high-impedance RF
probe. Measure TXRF
at C016
Frequency
OK?
Yes
Level
about
-3 dBm?
Yes
Measure RF level
at Q107 pin 2
Level about
+15 dBm?
Yes
November 16, 2006
Check coaxial
Yes
connector and
cable assembly
No Check
FGU
No
Check
FGU
No
1
Troubleshooting Charts: TX RF (VHF and UHF Range 2)
Measure RF
level
at C147
Level about
0 dBm?
Yes
Measure
drain of
Q104
No
Is voltage
5 V?
Yes
Remove SH701
and check for
parts off pad
No
2
Check bias of Q101,
Q103, and Q106.
Replace bad
transistors
MAEPF-27635-O
6881094C31-E