Auto antenna tuner working, TS-870, Kenwood, high-end all-mode HF radio.


I disassembled a working item.

It was inspected and serviced at JVC/Kenwood Service Yokosuka SC in September last year. No problem with over 100W output power and transmission/reception on each band.
Automatic antenna tuner is also working properly. After the repair was completed, it is communicating overseas at 7MHz with good results in SSB.
The meters on the upper left side of the panel, ALC and S-meter display, do not work and are broken.
The meter cannot be replaced. Other than that, the maintenance was completed with no reception or transmission problems. The meter was serviced with no other receiving or transmitting problems.
The up/down switch was malfunctioning, so the switch parts were replaced, and two other diodes were replaced.
In April 2021, it was inspected again by JVC/Kenwood Yokosuka SC, and the inspection report said that the problem was the same as in September 2020, except for the meter. However, it is an old product.
The connector on the board has been cut with nippers to prevent damage on the board side, so there is no load on the connector on the board side.
There is no load on the connector on the board side.

TS-870 ★Caution! The length is about 3.9in.

The first to eighth pictures are the items for sale.
The 10th photo is for reference when 13.8V, DC is put in and energized before disassembling.
The 9th photo is a copy of the inspection report document.
The 10th photo is a reference photo of the panel operation status.



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