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  1. FT-857
  2. Topics

Fuzzy white stuff on TOKO A55GV

Steve
 

Hi:
This component looks like a leaking electrolytic cap from days of yore. Next to it is a TOKO A55EU and a TOKO A55HV. They look pristine.
They are located at the back of the rig next to the optional filters.
Seems you have to take the bottom off and flip the radio over in order to swap these out.
Does anybody have any experience with one of these components failing? The radio seems to be working okay.
Should I care? I got the radio around 2006.
Thanks,
Steve
KA1ZFY
 

Hi Steve,

This is a known issue with the FT-857/897 and maybe the 817 also. The A55GV appears to be the AM ceramic filter. You may notice degraded performance on AM receive. Some users report low/no signal and intermittent/severe static crashing.?

The root cause of this issue is that the ceramic filters cannot withstand a DC voltage across them and Yaesu did not add DC blocking capacitors to the RF chain, so these components are failing. I've read that Yaesu will replace the filters and rework the board to add capacitors (if you pay them).?

You can read more here:?

Alternately you can add an optional filter to bypass the defective one if you end up having issues.?

73,
Joe W6JHP


On Tue, Mar 17, 2020 at 4:36 PM Steve <chobers@...> wrote:
Hi:
This component looks like a leaking electrolytic cap from days of yore. Next to it is a TOKO A55EU and a TOKO A55HV. They look pristine.
They are located at the back of the rig next to the optional filters.
Seems you have to take the bottom off and flip the radio over in order to swap these out.
Does anybody have any experience with one of these components failing? The radio seems to be working okay.
Should I care? I got the radio around 2006.
Thanks,
Steve
KA1ZFY

 

I hadn't used my 857 for a few years and noticed constant static after powering it up. Sure enough, the 3 ceramic filters had the white crusties. I sent the radio to Yaesu in Cypress, California and they replaced the filters for less than $75 for parts and labor and about $25 for shipping. I bought a set of the filters to do the job myself but after watching a couple of YouTube videos on someone actually doing the work, I decided I wasn't confident enough in my soldering skills around surface mount parts to do the job myself. I also had them do a tune-up while they had it. The turn-around time was about 3 weeks due to the virus. Well worth the price to have it done by the experts. The radio works great now.

73,
Bill N6EF

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