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Al, I am 82 and I started in 1962 but kept up as I am a retired professor with the subjects in Electronic Technology, Computer Technology, Electronic Media Communications. You can service it. There is only 12 volts and not the 400 and 600 volts or more with tubes. Trace the 12 volts and 5 volts just as if you were tracing the 400 volt line but without the shocks. You can not make it worse so give it a try. We are all here to help.

73's

Thanks

Bob ,K1WYC

Thank you all for your replies.

Unfortunately, I obtained my licence (VE3DLG) in 1963.? The test was entirely on vacuum tubes.? I have not kept up with solid state technology and at 83 years of age, I am unable to do any trouble shooting of this magnitude.? I thank you again for your advice ... I will try to get a new board.??

Al Hill, VE3DLG, Picton, Ontario.

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-----Original Message-----
From: Curt via groups.io <wb8yyy@...>
To: [email protected]
Sent: Tue, Jun 15, 2021 6:27 pm
Subject: Re: [BITX20] Question re transceiver kit UBITX v6

Let's troubleshoot and maybe its something simple. You transition seems to have been from off to receive when this occurred. Trace the path from 12 volt input to the big 5 volt regulator. It could even be the on switch that failed, or a wire fragment could have created a short circuit, taking out the fuse. I would check the path first with no dc input, with an ohmmeter before connecting it to voltage. Sorry for the extra adventure, and I am hopeful its something simple with little damage. Do engage Evan as you follow his deeper instructions.?

Curt

Let's troubleshoot and maybe its something simple. You transition seems to have been from off to receive when this occurred. Trace the path from 12 volt input to the big 5 volt regulator. It could even be the on switch that failed, or a wire fragment could have created a short circuit, taking out the fuse. I would check the path first with no dc input, with an ohmmeter before connecting it to voltage. Sorry for the extra adventure, and I am hopeful its something simple with little damage. Do engage Evan as you follow his deeper instructions.?

Curt

VE3DLG,

I have not read of this issue on this forum, though others may have experienced it.??

You can send an email to support@...,?though not sure that there is a warranty.? Hard to warrant kits as there are too many possibilities for the builder to do something outside of the capabilities of the device.

The first thing that comes to my mind is that your power source for the radio might have sent a surge that then caused the 5volt regulator to fail.? I would start by verifying the 12volt and 5volt supplies.? You will need to download the schematic to trace the power lines to the display.


Verify that there are 12volts on the P1 power connector on both pins 1 and 2.? Then measure the 5volt on pin 6 of the Controls header (the one that goes to the tuning encoder).? The Raduino schematic is here:



If you do have the 12volts, then remove the display and Raduino (the 2 boards that are held together with the standoffs) and connect a 5volt USB supply through the USB port on the Nano.? If that will power it up, then there is an issue with the mainboard.? If not, then you will need to load the Arduino IDE from Arduino.org, remove the Nano from the Raduino, and verify that the nano will connect and power up.? Do not try to change the program at this time.? You need the original software prior to downloading anything to the Nano.? I am just suggesting we use a different power source to see if the Raduino with the display will come up.

Ashhar Farhan, the main developer of the HFSignals ?BiTX, has a video of how to upload a new Nano program, though this is the last resort.

NOTE: If you need to install a new Nano, then you will need to calibrate the ?BiTX as the calibration values are stored in the Nano.? Updating the program does not change these values.

The two most common causes that I have seen for the issue you describe are the Nano fails, or the 5volt regulator fails after the simple power supply issues are factored out.? Depending on the problem, you would need a new Nano or new regulator if not a mainboard issue.

Good luck with finding your issue.
73
Evan
AC9TU