Motorola SSETM 5000 - Manual (Page 130)

November 11, 2004 6881094C12-A
9-26 Troubleshooting Charts: TX RF
TX RF—Page 2
MAEPF-27420-B
No
Yes
Driver
has low gain.
Replace U102.
RAWB+
about
7.2 Vdc?
Measure
RAWB+ voltage
at U102-6
No
No
Yes
Yes
TXB+
about
7.2 Vdc?
Check
continuity to
J1-1 thru E1.
Measure
Vgate at TP111,
normally 4 to
5.5 Vdc
Measure
TXB+ at
U102-14
All parts
around U102 & U104
soldered?
Vgate
> 4 Vdc?
2
4
Check
continuity to
J1-1 thru Q1,
F901 & E4.
Loss < 2 dB?
Measure RF levels at C723
& C721 (AC coupled). Calculate
loss thru antenna/remote switch
and antenna harmonic filter.
No
Yes
Check/fix
antenna/remote
switch and antenna
harmonic filter.
Check antenna
launch J101 &
radio assembly.
1
No Solder and
recheck