Motorola SSETM 5000 - Manual (Page 131)

6881094C12-A November 11, 2004
Troubleshooting Charts: TX RF 9-27
TX RF—Page 3
No
Yes
Measure TEMP
voltage at R130
No
Yes
Measure RFIN
DC voltage at
TP101
TEMP
voltage < 1.0 Vdc
at 25∞C?
PCIC is bad.
Replace U104
TP101
< 0.5 Vdc?
Check RF detector
(D101, C118, R107,
R103, R109) and
coupler (U101, R104,
R110, R118, R119).
Repair defects.
Repair temperature
sensor circuit
(U103, R129,
R130).
4
MAEPF-27476-O
RAWB+
about
7.2 Vdc?
Measure
RAWB+
at Q107-drain
No
No
Yes
Yes
Check
continuity of
nodes to TP111
V.gate
about 2-3
Vdc?
Check
continuity to
J1-1 thru E101.
PA has low gain.
Replace Q107.
Measure
gate bias
at L108
3