Icom IC-7300 repair: no transmission

I publish this article now even though I wrote it in december 2018.

Here we are, again.. murphy’s law strikes back!

Some time ago I got, together with some fellow ham radio friends, this Icom rig.

This is the first time I buy something “non Yaesu” because I was attracted by a multitude of positive reviews (most of all coming from our uncle Sam colleagues); furthermore for the appetite for hybrid SDR  technology and because of the hardware maturity of the model.

We went home with our new toys and I personally started to play with it briefly to take confidence with Icom menus and just the time to update the firmware to latest version.

Unfortunately I had to stop taking care of the seventythreehundred because at that time I had other priorities.

After some times, Christmas approaching and I took back the radio and finally start to transmit.

OMG I noticed ZERO power output.

After usual ritual curses, also because all Icom repair centers were closed, in order to claim the warranty repair, I decided to take this adventure and take it apart.

I believe the warranty is not voided just opening it because the owner’s manual permit at page 14-2, to replace the internal fuse explaining how to open the chassy….

I then followed the electrical schematics in order to follow the TX signal path to perform a visual inspection of the circuit.

I let some image to speak by themselves:




This capacitor that is in series to the path before RF amplification, is completely desoldered from its origonal pads and sticked to the below IC!



That’s clearly a factory defect and I asked myself how quality control (was it ever performed ?) couldn’t have noticed this.

At the same time I was happy because this repair was trivial!

Obviously the radio started to work perfectly after I put the cap in its original place!!

I hope my 7300 was the only one with this defect ….

4 Replies to “Icom IC-7300 repair: no transmission”

  1. I have worked on computer PWBs as engineer. This looks like the part was bumped or hit after soldering. Perhaps it was during a final assembly. Testing and adjustment of the transmitter sections may happen prior to final assembly.

    Definitely a warranty issue and should not have happened. I am glad you had the troubleshooting and soldering skills to solve it yourself.

    I’m quite happy with my year old 7300.

  2. Mine stopped transmitting or no output after using an Ameritron AL-811H. Not sure what happened with perfect SWR on 17 meters and all of the obvious settings and or adjustments.

  3. Thanks for putting this video. My 2-3 YO 7300 lost it’s power recently, I used to repair electronic equipment professionally. Your video have me the courage to dust off the old brain and give it ago. I have to get a new ground strap for ESD prevention and order new power transistors. Been retired about eight years now. Hey if it does not work I still have the option to send it back to Icom. it’s out of warranty now.

Leave a Reply

Your email address will not be published. Required fields are marked *