My QCX+ worked great for more than 2 years. It stopped transmitting step by step. Sometimes 1 Watt output , after switching off and on for a few seconds again 3 Watts (12.6V). Than only 0.5 Watt during transmission.?
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And now no output anymore. Sometimes the trx is switching of, when trying to transmit. I removed the 3 BS170 transistors .? Seems to be that there is one of the FEDs damaged . Im not shure, if my SN74AC00N is still ok.?
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I can still receive, no problem. After removing the 3 Transistors the trx is stable, even when pressing the key.?
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Values during trx without BS170 Pins of? SN74AC00N, DMV Measurement
Pin?
1? ? ? ? ? ? ? ?2.46V
2? ? ? ? ? ? ? ?2.46V
3? ? ? ? ? ? ? ?2.51V
4? ? ? ? ? ? ? ?1.71V
5? ? ? ? ? ? ? ?4.97V
6? ? ? ? ? ? ? ?2.46V
7? ? ? ? ? ? ? ?0V
8? ? ? ? ? ? ? ?2.46V
9? ? ? ? ? ? ? ?0.10V
10? ? ? ? ? ? ?1.71V
11? ? ? ? ? ? ?4.97V
12? ? ? ? ? ? ?0.02V
13? ? ? ? ? ? ?0.02V
14? ? ? ? ? ? ?4.98V
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Im not sure, if this values are good.?
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Any Idea ?
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72 de Matt, DL1SER
