I spent some time today continuing my attempts to repair the TS-120v I described in part 1 here .
The radio is now usable on SSB on 80/40/20M however it still has no output on 15M and 10M , other faults are a non-functioning S meter and no output on CW.
One of the common faults that can cause a none-functioning S meter is the relay on the IF board.
There is a well written article on the replacement of this relay on the Kenwood TS120_130 yahoo group - "TS130v Omron relay removal/replacement" Based on this I ordered 2 NF4EB-12v relays - these are a drop in replacement for the original Omron LZN4 which is now obsolete.
It seems that the Matsushita NF4EB relays are also obsolete , so it was hard to find a source for them.
I eventually found an ebay seller in China that had them in stock for $6 each - see ebay item 381034198000
I replaced the relay using the instructions in the link above. It was fairly straightforward however I needed to use solder braid and liquid flux to cleanly desolder the 15 pins.
After replacing the IF board and carrying out an on-air test I now have a working S meter.
Next I need to fix the CW problem and the lack of output on 15/10M
The radio is now usable on SSB on 80/40/20M however it still has no output on 15M and 10M , other faults are a non-functioning S meter and no output on CW.
One of the common faults that can cause a none-functioning S meter is the relay on the IF board.
There is a well written article on the replacement of this relay on the Kenwood TS120_130 yahoo group - "TS130v Omron relay removal/replacement" Based on this I ordered 2 NF4EB-12v relays - these are a drop in replacement for the original Omron LZN4 which is now obsolete.
It seems that the Matsushita NF4EB relays are also obsolete , so it was hard to find a source for them.
I eventually found an ebay seller in China that had them in stock for $6 each - see ebay item 381034198000
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| Omron LZN4 on left. Replacement NF4EB on right |
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| IF board removed from the transceiver |
I replaced the relay using the instructions in the link above. It was fairly straightforward however I needed to use solder braid and liquid flux to cleanly desolder the 15 pins.
 |
| IF board fitted back into TS-120v with new relay (orange) |
After replacing the IF board and carrying out an on-air test I now have a working S meter.
 |
| working S meter |
Next I need to fix the CW problem and the lack of output on 15/10M
