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Re: FT-817 almost powers up

 

Hello,

just my experience from this week.

After a repair and a mod (SEL encoder, and Sotabeam filter) everything was working fine.
A few days later I tried to power up the radio and I wasn't working?anymore - no sign of life.?
I don't have any internal battery installed so I could check only with external power supply.

I was a little bit puzzled at the problem, because?the main bus voltage was not consistent between measurements.

At the end I was able to track the issue down to a broken trace (the one near the power plug?which?connects the negative of the power plug to the choke filter. So based on where I put the negative lead of my multimeter I could see or not see a voltage.
After repairing this track everything went fine and current consumption?is normal.

I still don't know the reason for the broken trace. I could see corrosion due to a precedent repair in the area (probably?power connector replacement and corrosive flux left in the pcb), which was noticeable even on a picture?I took at the radio just before?repair and mod, exactly on the broken trace.

Hope that helps,


--
Simone Fabris - IU3QEZ



Il giorno ven 21 ott 2022 alle ore 03:44 Doug Jackson <doug@...> ha scritto:
I would also check D1085 and T1035- If they have gone open then the DC input wouldn't work.

Kindest regards,

Doug Jackson

ph: 0414 986878




On Fri, 21 Oct 2022 at 12:40, Bill W1PA <w1pa@...> wrote:
Yeah the fuse next to the three electrolytics was the first thing I checked. It's conductive.

On Oct 20, 2022 9:26 PM, Doug Jackson <doug@...> wrote:
EA4GPZ has a great article on replacing the Internal fuse within the FT817.


I damaged my own fuse when I reverse polarised the unit a couple of years ago.

Kindest regards,

Doug Jackson

ph: 0414 986878

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On Fri, 21 Oct 2022 at 12:06, Bill W1PA <w1pa@...> wrote:
with power plugged in ? --- yes.
If I remove the power and use the battery, the voltage readings seem correct.

In the original post I was measuring from the 817 case to the 13.8 line on the main board and getting 0v (because relative to the DC barrel, they are both 13.8? --? same potential)

b


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