Motorola SSETM 5000 - Manual (Page 129)

6881094C12-A November 11, 2004
Troubleshooting Charts: TX RF 9-25
9.14 TX RF—Page 1
TX
power OK?
Place XCVR and VOCON
into the analysis fixture.
Key up. Measure RF
power at remote port
(fixture default).
Yes
No
No
Yes
Yes
No
No or low
TX power
Check
FGU
Frequency
OK?
No
Yes
Check
FGU
Level
about
+4 dBm?
Check remote
port launch J102
& radio assembly
Measure RF level
at driver amp
outlet, just after C107.
Use a spectrum analyzer
and high-impedance RF
probe. Measure TXRF
at FGU side of C106.
RF level at
approx. +26 dBm?
No
No
Yes
Yes
Level about
+38 dBm?
Check/fix
TX/RX switch
Measure RF levels at
C722 & C723 (AC
coupled). Calculate
TX/RX switch loss.
Measure RF level
at PA output,
C103.
Check/fix antenna/
remote switch and
remote harmonic
filter.
Loss < 1 db?
2
3
MAEPF-27475-B
Original
power issue
with remote
port?
Yes
No
1