Check For Inhibiting Of Transmitter - Tait TM9100 Service Manual

If the transmitter is drawing no current or the wrong current, check
Task 7 —
Check for Inhibiting
whether it is being inhibited. This check is also required if a CO3 error
of Transmitter
occurs in
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
262 Transmitter Fault Finding (50W/40W Radios)
Task 1.
If not already done, enter the CCTM command 33 to place the radio
in transmit mode.
Check the logic signal at the
The signal should be:
TX INH test point: about 0V (inactive)
If the signal is inactive as required, go to
1.1V — the transmitter is being inhibited; go to
Enter the CCTM command 32 to place the radio in receive mode,
and go to Task 12 in "Biasing of PA Driver and PAs" on page
Check the logic signal at the
on page 288 (B1 band) or
should be:
D TX INH test point: about 0V (inactive)
If the signal is inactive as required, go to
3.2V — the temperature sensor is suspect; go to
Enter the CCTM command 32 to place the radio in receive mode,
and go to Task 8.
The lock status is possibly no longer normal. Enter the CCTM
command 72 and check the lock status.
Enter the CCTM command 32 to place the radio in receive mode.
The normal lock status is 110. If it is not, proceed to the relevant
section. If it is, go to Step
Check for short circuits on the
point.
Repair any fault, confirm the removal of the fault, and go to
Tasks" on page 147. If the repair failed or no fault could be found,
replace the main-board assembly and go to
page 147.
test point (see
TX INH
Step 4. If it is active — about
Step
test point; see
D TX INH
Figure 11.6 (H5, H7 bands). The signal
Step 8. If it is active — about
Step
11.
line from the
DIG TX INH
"Final Tasks" on
TM9100 Service Manual
© Tait Electronics Limited August 2005
Figure 11.6).
5.
269.
Figure 11.18
7.
test
D TX INH
"Final