TX high temperature

Fault Name: TX high temperature
Related faults: SO TRXC I2A:11 – TX high temperature
SO TRXC I2A:25 – TX max power restricted
AO TX I1B:27 – TX max power restricted
Description: The temperature of the PA transistors is supervised. At maximum component temperature, faults SO TRXC I2A:11 and SO TRXC I2A:25 are raised on TRXC and maximum TX output power is reduced by 2 dB.
If the temperature is still over maximum component limit after 2 minutes, the maximum output power is reduced by another 2 dB.
If the temperature is still over maximum component limit after 2 minutes more, the transmitter is automatically shut down and faults AO TX I1B:12 and AO TX I1B:27 are raised.
The fault stays active until temperature stays below the limit for 5 minutes. The TX is then enabled and maximum output power is progressively increased.
Possible reasons: Climate system failure – TRU dummies missing – high temperature outside the cabinet