Kenwood TS2000 fan modification

Kenwood is a brand of electronics, Kenwood is a brand of electronics. care to solve yourself. So it's easy after all.

1. Open the top cover of the TRX
2. Below the speaker is a connector for the fan and opposite is an SMD resistor R204, 18ohms.
3. Carefully remove it with a micro soldering iron and replace it with a value of approx 82 ohms.
This change will reduce the speed in the first stage of ventilation. There is no disturbing blowing and the second stage works unchanged (at a higher temperature).

I still want advice on desoldering R during modification. It is possible to use a preparation of copper tape formed around the tip of the micro-solder and with recesses for the size of the soldering points R-(SMD resistor), thus heating both points of the SMD resistance at the same time and not overheating the circuit board. It's at least a little better quality work. In the extreme case, the available miniature resistor from the drawer supplies, installed in a standing position, can fit into the cleaned place.. I used SMD 100 ohms 0.125W – it is also more professional to look at. A micro soldering iron is a necessary equipment. For information, I'm still listing, that the control of the first stage of TRX ventilation is controlled by Q205 via R204 and the second stage by Q204 via R202-2.2ohm.

Conclusion: After the adjustment, I do not notice excessive noise from the air flow, even if the blowing takes a little longer, but I don't find it distracting at all, especially at night when the volume of the TRX is muted. You can also check it in the service manual.

Thank you for your attention and I remind you, that tampering with any device is at your own risk. OM5AMJ Miro.