Kenwood TS-430S

This is a collection of notes on the care and feeding of a TS-430S.


Common Issues

Like the TS-440S, the TS-430S suffers from a set of pretty common problems. Yes, this is kinda similar to the TS-440S notes!

Dry Joints

There are very likely dry joints everywhere. This seems to be some weird combination of perhaps some early automated soldering and a whole lot of a lack of solder being used. In a lot of cases I’ve seen barely enough solder on each pad and it cracks very very easily. A lot of repairs can be summarised as “take out each board, touch up every joint.”


The finals are either in great shape or someone’s run the rig into the ground. I always pull out the LPF output filter and finals board for inspection. I’ll always touch up the soldering on the finals board - especially around all the transistors on the board. A fresh coat of thermal grease is also a great idea.

RF Board Repair/Alignment


PLL Board Repair/Alignment


Control Board Repair/Alignment


USB/SSB frequency response, IF offset Alignment

Like a lot of non-computer rigs before it, the TS-430S has separate oscillators for LSB, USB and CW. AM and FM are derived from the CW oscillator.

IF offset alignment is mostly about getting the 8.83MHz oscillator working right.

Bypassing the finals for output alignment

Whilst on the topic of output alignment - here’s something I commonly do. Unless you need to test something like the finals or ALC, you can just take the RF output from the RF board, put it into a 56 ohm resistor and put a scope across that. I’ll do this for testing things like the above USB/SSB frequency response, frequency calibration, output carrier cleanliness, modulation, etc - none of these require full output power or ALC to work. It saves a bunch of headache around things around having to output real RF power just to check things - so you don’t have to worry about how long you leave your radio on and transmitting whilst aligning the VCOs/PLLs.


This is a collection of versions of user manauls and service manuals.

High-resolution schematics