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P.S..... Should read "...control line connectors."

All I can suggest is that you tighten all the screws fixing the board to the chassis, then pull and then reseat the dc and control like connectors...It could simply be an oxidized interconnection

Well this is frustrating ... I removed the screen cover from the Final unit to access the TX/RX relay and now it's working again ?. I couldn't see anything loose so I'm in the dark as to what's

Sorry - I now see you are asking about the 870s, not 570S.

Mike, ([A=B] + POWER ON) should be a full reset, so you should be good there. In your image what am I looking at (discolorization on the RF shielding); is that a burn mark? Random thoughts //

That's a reflection in the screening can ?. -- Mike G8GYW

Thanks Jordan, yes that was helpful. I found a good quality set of schematics on mods.dk and have identified the TX/RX relay which is switched by a TXB line. Time to start probing ... -- Mike

What is that scorched discolored area...? Looks like something arced or burned... Jordan...

Manuals sometimes show a partial reset and a full or complete reset. Bob W4JFA [email protected]> wrote:

Get the service manual and read the portion that deals with the RX/TX change-over. I'm pretty sure you'll find a description as to how the change-over is implemented. Normally there are voltages such

Thanks Bob. I tried the Full Reset described in the instruction manual ([A=B] + POWER ON) to no effect. Is that the same as the factory reset? The Mic socket and ACC2 are wired to the TX-RX Unit

If you haven't already, try a factory full reset. I'm not a professional tech but I've fixed 2 radios in the past year and a half doing a full reset. Bob W4JFA wrote:

I have the schematic, just hoping for some pointers. Nothing happens when I operate PTT, it stays in RX. -- Mike G8GYW

You should be able to find a schematic and trace the circuit, at least in theory!

Thank you David. My plan is to (hopefully) gather some suggestions before opening it up. -- Mike G8GYW

Possible that the ALC board DC-DC converter has quit. I had that happen to my TS850; all the lights but no TX. Just my guess.

Hi everyone I bought this radio from a dealer a year ago. It is in immaculate condition despite its age and worked flawlessly until now. It would start to drop out of TX occasionally during a QSO

Now here is a rare find. I have for sale a Kenwood 500hz CW filter, listed as the YF-3395C-1 but it looks identical to the more common YG3395C. ?This fits the 520, 599, 511, 510, and other radios

I recently acquired a Kenwood SM-230 with original box and am excited to integrate it into my shack. I will take some unboxing photographs if anyone is interested. 73, David, WU3J

Gary anyone who has a 3D printer can download all kinds of files from places like 'thingyverse', here are just a few of the knob designs available on there. Our club could make them because we have 3D