Re: FT-817 almost powers up
Hi
It has been a while since i read about this sort of fault but i do remember someone saying that there is a common mode filter in the power rail at some point and that with a reverse polarity feed and a chassis ground that the negative rail can be taken out. A quick way to check is DC ohms check from the negative lead to the radio chassis.
A long shot but hope it helps
73<DE> Mark
|
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,
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.
|
Re: FT-817 almost powers up
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.
|
Re: FT-817 almost powers up
Yeah the fuse next to the three electrolytics was the first thing I checked. It's conductive.
toggle quoted message
Show quoted text
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
Check out my awesome clocks at Follow my amateur radio adventures at
----------------------------------------------------------- Just like an old fashioned letter, this email and any files transmitted with it should probably be treated as confidential and intended solely for your own use.?
Please note that any interesting spelling is usually my own and may have been caused by fat thumbs on a tiny tiny keyboard. Should any part of this message prove to be useful in the event of the imminent Zombie?Apocalypse then the sender bears no?personal, legal, or moral responsibility for any outcome resulting from its?usage unless the result of said usage is the unlikely defeat of the Zombie Hordes?in which case the sender takes full credit?without any theoretical or actual?legal liability. :-)
Be nice to your parents.
Go outside and do something awesome - Draw, paint, walk, setup a radio?station, go fishing or sailing - just do something that makes you happy. ^G ^G ^G ^G ^G ^G ^G ^G- In more laid back days this line would literally sing ^G ^G ^G ^G ^G ^G ^G ^G?
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
|
Re: FT-817 almost powers up
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
Check out my awesome clocks at Follow my amateur radio adventures at
----------------------------------------------------------- Just like an old fashioned letter, this email and any files transmitted with it should probably be treated as confidential and intended solely for your own use.?
Please note that any interesting spelling is usually my own and may have been caused by fat thumbs on a tiny tiny keyboard. Should any part of this message prove to be useful in the event of the imminent Zombie?Apocalypse then the sender bears no?personal, legal, or moral responsibility for any outcome resulting from its?usage unless the result of said usage is the unlikely defeat of the Zombie Hordes?in which case the sender takes full credit?without any theoretical or actual?legal liability. :-)
Be nice to your parents.
Go outside and do something awesome - Draw, paint, walk, setup a radio?station, go fishing or sailing - just do something that makes you happy. ^G ^G ^G ^G ^G ^G ^G ^G- In more laid back days this line would literally sing ^G ^G ^G ^G ^G ^G ^G ^G?
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
|
Re: FT-817 almost powers up
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
|
Re: Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas
Here is link to the recording-?
On Thu, Oct 20, 2022 at 8:47 PM Anthony Luscre < k8zt73@...> wrote: Unfortunately, the message of the passcode change to RATPAC did not get out to everyone -
Hi Anthony;?
No way was I able to log into the 2nd week of Zoom; first week, no problem.? It kept asking me for the password which I understood as "WEDNESDAY".? But I will plan on watching it on YouTube.
73, Karl, KO8S in Michigan
On Thursday, October 20, 2022 at 02:26:07 PM EDT, Anthony Luscre < k8zt73@...> wrote:
Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas watch the recording now-
Join us live for week 3 Oct 26-
View Week 1 Recording at [
-- Anthony Luscre
K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ?
The Web Resource Hoarder-
K8ZT Radio Website-
Amateur Radio Resources for Students/Youth -
--
Anthony Luscre
K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ?
The Web Resource Hoarder-
K8ZT Radio Website-
Amateur Radio Resources for Students/Youth -
-- Anthony Luscre
K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ?
The Web Resource Hoarder-
K8ZT Radio Website-
Amateur Radio Resources for Students/Youth -
|
Re: Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas
Unfortunately, the message of the passcode change to RATPAC did not get out to everyone -
Hi Anthony;?
No way was I able to log into the 2nd week of Zoom; first week, no problem.? It kept asking me for the password which I understood as "WEDNESDAY".? But I will plan on watching it on YouTube.
73, Karl, KO8S in Michigan
On Thursday, October 20, 2022 at 02:26:07 PM EDT, Anthony Luscre < k8zt73@...> wrote:
Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas watch the recording now-
Join us live for week 3 Oct 26-
View Week 1 Recording at [
-- Anthony Luscre
K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ?
The Web Resource Hoarder-
K8ZT Radio Website-
Amateur Radio Resources for Students/Youth -
-- Anthony Luscre
K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ?
The Web Resource Hoarder-
K8ZT Radio Website-
Amateur Radio Resources for Students/Youth -
|
Re: Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas
Hi Anthony;?
No way was I able to log into the 2nd week of Zoom; first week, no problem.? It kept asking me for the password which I understood as "WEDNESDAY".? But I will plan on watching it on YouTube.
73, Karl, KO8S in Michigan
On Thursday, October 20, 2022 at 02:26:07 PM EDT, Anthony Luscre <k8zt73@...> wrote:
Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas watch the recording now-
Join us live for week 3 Oct 26-
View Week 1 Recording at [
-- Anthony Luscre
K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ?
The Web Resource Hoarder-
K8ZT Radio Website-
Amateur Radio Resources for Students/Youth -
|
Re: FT-817 almost powers up
b,
Is the VOM reading with the power connector plugged into the FT817.
If you do then I would think the connector has lost it's connection to the FT817 ground/neg supply connection.? If not in the FT817 then I would be concerned if the cable connections are reversed and the fT817 has another path to ground.
73, ron, n9ee/r Ron Wright, N9EE/R Hernando Co ARES EC
Spring Hill, Florida also n9ee55@...
On Thursday, October 20, 2022 at 08:19:41 PM EDT, Denis Brown <kanekobrown1@...> wrote:
Hello Bill
I do not have a circuit (schematic) for the 817 here but I do know that the much earlier FT290 and FT690 had a reverse polarity diode in the negative pole of the DC power connector.
If the FT817 is similar, I would investigate the health of that, or any other, reverse polarity protection circuit / device.
Hope this helps
Denis VK6AKR
On Friday, October 21, 2022, Bill W1PA < w1pa@...> wrote: > Also, what fault would cause a VOM voltage reading of 13.8V from the DC barrel (-) to the 817 metal case?? (same radio)? Do I have a shorted cap? > > b
|
Re: FT-817 almost powers up
Hello Bill
I do not have a circuit (schematic) for the 817 here but I do know that the much earlier FT290 and FT690 had a reverse polarity diode in the negative pole of the DC power connector.
If the FT817 is similar, I would investigate the health of that, or any other, reverse polarity protection circuit / device.
Hope this helps
Denis VK6AKR
toggle quoted message
Show quoted text
On Friday, October 21, 2022, Bill W1PA < w1pa@...> wrote: > Also, what fault would cause a VOM voltage reading of 13.8V from the DC barrel (-) to the 817 metal case?? (same radio)? Do I have a shorted cap? > > b > _._,_._,_ > ________________________________ > 开云体育 Links: > > You receive all messages sent to this group. > > View/Reply Online (#113242) | Reply To Group | Reply To Sender | Mute This Topic | New Topic > Your Subscription | Contact Group Owner | Unsubscribe [ kanekobrown1@...] > > _._,_._,_
|
Re: FT-817 almost powers up
Also, what fault would cause a VOM voltage reading of 13.8V from the DC barrel (-) to the 817 metal case?? (same radio)? Do I have a shorted cap?
b
|
Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas
Beginner's Guide to HF Amateur Radio- Week 2- HF Radios & Antennas watch the recording now-
Join us live for week 3 Oct 26-
View Week 1 Recording at [
-- Anthony Luscre
K8ZT Ohio Section Section Youth Coordinator & Education Outreach ARRL - The National Association For Amateur Radio? ?
The Web Resource Hoarder-
K8ZT Radio Website-
Amateur Radio Resources for Students/Youth -
|
I have a 817 I am working on that I picked up at a flea.
- on battery, when POW-ON the display briefly starts (solid pattern on LCD) and shuts off (and I hear a relay click)
- on external power, the rig does nothing (and it appears there maybe short -- supply shuts off)
Anyone seen this before?? I probed around the power connector and it seems ok I also checked the MAIN board top and bottom and I don't see any craters. On battery, when I power up I seem to get a good 5V at the display before it shuts off. b
|
James,
Thanks For The Information, Nice low cost Method.? Checked My Two FT-817 and I am Happy That The 4 year old China TCXO are Still in Specification, On the Other Hand the recently "Purchased " FT-817 with? NO TCXO (standard factory) is 197HZ OFF, I Did Order a TCXO for it from Ali as it was the best? cost/shipping compromise.
Best Regards.
Steve AB2ET/4
|
Re: Watch "Testing Chinese HF linear amplifier DIY kits 70W SSB linear HF Power Amplifier For YAESU FT-817 KX3" on YouTube
On Thursday, October 20, 2022 at 10:37:09 AM EDT, Douglas Richards <ve3ffr@...> wrote:
|
Looks like a decent kit. I think I'll go for it and get one. Thanx for all the replies and suggestions.
Dan KD3CEU
On Thursday, October 20, 2022 at 10:12:59 AM EDT, Ken N2VIP <ken@...> wrote:
A link would have been nice... Ken, N2VIP
On Oct 20, 2022, at 8:42 AM, Douglas Richards <ve3ffr@...> wrote:
Hi All
There is a youtube video
73
Douglas Richards VE3FFR
|
Watch "Testing Chinese HF linear amplifier DIY kits 70W SSB linear HF Power Amplifier For YAESU FT-817 KX3" on YouTube
|
A link would have been nice... Ken, N2VIP
toggle quoted message
Show quoted text
On Oct 20, 2022, at 8:42 AM, Douglas Richards <ve3ffr@...> wrote:
Hi All
There is a youtube video
73
Douglas Richards VE3FFR
|
Easy way is to use WWV 10 or 15 mhz and tune down 1500 hz on LSB. That should make an audio tone with the radio tuned LSB to 9998500 (10 mhz) results at 1500 hz. Use one of many computer programs to measure the audio tones exact frequency.? While you might get a hertz or so variation due to the E propagation layer changing height, it should be "close enough".
Would probably be worth while to move to USB and tune to 10001500 to verify the results.
Jim/VEZ
|
Doug Jackson
Anthony Luscre
Doc Sarvis
James Redding WA9VEZ