TB7100 Service Manual Transmitter Fault Finding (25W) 233
© Tait Electronics Limited October 2005
12. Repair any fault, confirm the removal of the fault, and go to “Final
Tasks” on page 123. If the repair failed or no fault could be found,
replace the main-board assembly and go to “Final Tasks” on
page 123.
Task 8 —
Check Temperature
Sensor
If the transmitter is being inhibited and the logic signal at the DTXINH test
point is active, a fault in the temperature sensor might be the cause.
1. Enter the CCTM command 47 to check the temperature reading.
2. Of the two numbers returned, the first is the temperature in degrees
celsius and should be about 25°C. If it is, go to Task 12
in “Biasing of
PA Driver and PAs” on page 239. If it is not, go to Step 3.
3. If not already done, remove the
PAF TOP can.
4. Check D301 and the surrounding components — see Figure 13.6
(B1 band) and Figure 13.7 (H5 and H6 bands).
5. If there is no fault, go to “CODEC and Audio Fault Finding” on
page 343. If a fault is found, repair it, confirm the removal of the
fault, and go to “Final Tasks” on page 123. If the repair failed, replace
the main-board assembly and go to “Final Tasks” on page 123.
To Next Page
Loading...
Need help?
General
