TM8100/TM8200 Service Manual Transmitter Fault Finding (25W) 337
© Tait Electronics Limited June 2006
12. Repair any fault, confirm the removal of the fault, and go to “Final
Tasks” on page 157. If the repair failed or no fault could be found,
replace the board and go to “Final Tasks” on page 157.
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 Tas k 1 2
in “Biasing of
PA Driver and PAs” on page 342. 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 12.6.
5. If there is no fault, go to “CODEC and Audio Fault Finding” on
page 381. If a fault is found, repair it, confirm the removal of the
fault, and go to “Final Tasks” on page 157. If the repair failed, replace
the board and go to “Final Tasks” on page 157.
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