284 Transmitter Fault Finding (>25W) TM8100/TM8200 Service Manual
© Tait Electronics Limited November 2007
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 may 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 290. 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 11.6
(UHF shown).
5. If there is no fault, go to “CODEC and Audio Fault Finding” on
page 399. If a fault is found, repair it, confirm the removal of the
fault, and go to “Final Tasks” on page 163. If the repair failed, replace
the board, and go to “Final Tasks” on page 163.
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