226 Transmitter Fault Finding TP9100 Service Manual
© Tait Electronics Limited May 2005
9. Repeat Step 3 to Step 5.
10. Depending on the results of the above measurements, proceed to the
task indicated in Table 10.3. Note that the power and current are
considered to be skewed if they are low at one part of the frequency
band and high elsewhere.
Task 4 —
Power Unchanged
Regardless of
Setting
If all the power and current values measured in Task 3 are correct, it is likely
that the power remains unchanged regardless of the power setting.
1. Enter the following CCTM commands in turn and measure the RF
output power in each case:
■ 326 3 – mid power
■ 326 2 – low power
■ 326 1 – very low power
2. The above measurements should confirm that the power remains
unchanged at all settings. Carry out Tas k 9
and then Task 12 .
Table 10.3 Tasks to be performed according to the results of the power and current measurements
of Task 3
Power Current Task
Correct Correct Task 4 — Power unchanged regardless of setting
Correct Wrong Task 13 — Biasing of PA driver
Skewed Skewed Task 7 — Power and current are skewed
Low (> 0.1 W) Low (> 0.5 A) Task 8 — Power and current are low
None at RF connector (< 0.1 W) Low (> 0.5 A) Task 13 — Biasing of PA driver
None at RF connector (< 0.1 W) None (< 0.5 A) Task 5 — Check for inhibiting of transmitter
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