On Mon, Sep 16, 2024 at 07:02 PM, Damon wrote:
So, What in the world would cause the PA’s to be gated and dump all that power to overload?
Damon, with default settings the PA voltage is high in RX mode (see
here). With one problem in the PA stage a current may flow also in RX mode.
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Additionally, pressing the encoder to turn the radio on does not work. I actually have to press my fingertip to Q105 to latch it on. Pressing the encoder to power down the radio “works” but there is a current draw of 0.065A until I remove the plug. Trying to restart the radio does not work until it is unplugged.?
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I’m starting suspect IC503 and the MCU. I’m not wanting to reinvent any wheels so any and all advice to move forward is graciously appreciated!
Thats not my first place.
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Further tests show poor 80/60m performance and there is a significant voltage drop compared with the other LPF’s.
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All together it looks to me like more than one failure. So a remote debugging is very difficult. It would be good to sort out one of the problems to start. I think the best is to start with the switch on / off problem.
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Like I wrote before
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Additional remove SMPS and check resistance from PWR_ON (mainboard) to GND with and without left encoder depressed.
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I actually have to press my fingertip to Q105 to latch it on.
Which contact of Q105?
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73 Ludwig
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