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TS-870S no TX

Mike All Messages By This Member #470 Sam ? I checked that the relay and PCB connectors were secure but the only screws I disturbed were those on the top shield. I left the radio on for several hours and tested it in TX periodically and it was OK. ? It certainly does look good on the inside ?. ? -- Mike G8GYW
ED MONTAIGNE All Messages By This Member #471 HB9TC toggle quoted message Show quoted text On Thu, Mar 13, 2025, 6:44?PM Mike via <mail=[email protected]> wrote: Sam ? I checked that the relay and PCB connectors were secure but the only screws I disturbed were those on the top shield. I left the radio on for several hours and tested it in TX periodically and it was OK. ? It certainly does look good on the inside ?. ? -- Mike G8GYW
Mike All Messages By This Member #472 I managed to get the fault to return by inserting a plug into the ACC2 socket, which was a tight fit and required a lot of effort. When I removed the DIN cable normal operation returned. ? Something on that board is obviously intermittent. ? -- Mike G8GYW
Gary Cook All Messages By This Member #473 开云体育 After allowing radio to warm up (let sit for 15 minutes turned on), take a #2 type pencil (with a new eraser), and press down on every component on the board (or boards), while the radio is in the mode that is malfunctioning. Watch your meter or indicators closely, that show intermittent problem. This method is great for finding breaks in components and solder traces. Take your time, not getting in a hurry. Gary On 3/14/2025 7:17 AM, Mike via groups.io wrote: toggle quoted message Show quoted text I managed to get the fault to return by inserting a plug into the ACC2 socket, which was a tight fit and required a lot of effort. When I removed the DIN cable normal operation returned. ? Something on that board is obviously intermittent. ? -- Mike G8GYW
Jordan All Messages By This Member #474 ? Is there anything connected to the ACC2 cable, or is it just the plug...? ? Jordan VE6ZT ? ? toggle quoted message Show quoted text ----- Original Message ----- From: Gary Cook via groups.io To: [email protected] Sent: Friday, March 14, 2025 6:27 AM Subject: Re: [Kenwood-Amateur-Radio] TS-870S no TX After allowing radio to warm up (let sit for 15 minutes turned on), take a #2 type pencil (with a new eraser), and press down on every component on the board (or boards), while the radio is in the mode that is malfunctioning. Watch your meter or indicators closely, that show intermittent problem. This method is great for finding breaks in components and solder traces. Take your time, not getting in a hurry. Gary On 3/14/2025 7:17 AM, Mike via groups.io wrote: I managed to get the fault to return by inserting a plug into the ACC2 socket, which was a tight fit and required a lot of effort. When I removed the DIN cable normal operation returned. ? Something on that board is obviously intermittent. ? -- Mike G8GYW
Mike All Messages By This Member #475 On Fri, Mar 14, 2025 at 12:38 PM, Jordan wrote: Is there anything connected to the ACC2 cable, or is it just the plug...? ? Jordan VE6ZT ? Jordan, it was a DIN cable with plugs at both ends. I did check that there were no shorts between the pins. ? The cable appears to be of good quality but the plug required a lot of effort to mate with the ACC2 socket. I tried it with another socket and it was much easier. ? When I bought the radio it had the original Kenwood silver sticker over the ACC2 socket so I'm guessing it has never been used before. ? -- Mike G8GYW
Jordan All Messages By This Member #476 ? Mike, is that cable plugged into another device..?? If not, there is a?PTT connection from the ACC2 connection?for that cable. What happens if you ground the PTT connection...? ? I've never seen a sticker covering any of the rear panel connections in any Kenwood I've seen, but I haven't owned or worked on an 870. Lots of 850s and 450s, but no 870s...It sounds more like an ACC2 connction problem than a rig problem... ? 73...Jordan toggle quoted message Show quoted text ----- Original Message ----- From: Mike via groups.io To: [email protected] Sent: Friday, March 14, 2025 7:51 AM Subject: Re: [Kenwood-Amateur-Radio] TS-870S no TX On Fri, Mar 14, 2025 at 12:38 PM, Jordan wrote: Is there anything connected to the ACC2 cable, or is it just the plug...? ? Jordan VE6ZT ? Jordan, it was a DIN cable with plugs at both ends. I did check that there were no shorts between the pins. ? The cable appears to be of good quality but the plug required a lot of effort to mate with the ACC2 socket. I tried it with another socket and it was much easier. ? When I bought the radio it had the original Kenwood silver sticker over the ACC2 socket so I'm guessing it has never been used before. ? -- Mike G8GYW
Jordan All Messages By This Member #477 ? P.S....that cable should plug in quite easily...are you sure it has the right pin spacing..? toggle quoted message Show quoted text ----- Original Message ----- From: Mike via groups.io To: [email protected] Sent: Friday, March 14, 2025 7:51 AM Subject: Re: [Kenwood-Amateur-Radio] TS-870S no TX On Fri, Mar 14, 2025 at 12:38 PM, Jordan wrote: Is there anything connected to the ACC2 cable, or is it just the plug...? ? Jordan VE6ZT ? Jordan, it was a DIN cable with plugs at both ends. I did check that there were no shorts between the pins. ? The cable appears to be of good quality but the plug required a lot of effort to mate with the ACC2 socket. I tried it with another socket and it was much easier. ? When I bought the radio it had the original Kenwood silver sticker over the ACC2 socket so I'm guessing it has never been used before. ? -- Mike G8GYW
Mike All Messages By This Member #478 No the cable wasn't plugged into anything else. ? When the fault is present none of the PTT functions works (MIC, ACC2, SEND, AT TUNE). ? I presume it's a standard 13 pin DIN socket so the cable plug should fit, but I can't tell if the problem lies with the pins or the shroud. ? -- Mike G8GYW
Mike All Messages By This Member #479 On Fri, Mar 14, 2025 at 12:27 PM, Gary Cook wrote: After allowing radio to warm up (let sit for 15 minutes turned on), take a #2 type pencil (with a new eraser), and press down on every component on the board (or boards), while the radio is in the mode that is malfunctioning. Watch your meter or indicators closely, that show intermittent problem. This method is great for finding breaks in components and solder traces. Take your time, not getting in a hurry. Gary ? Thanks Gary, I will try that next time it fails. ? -- Mike G8GYW ?
Jordan All Messages By This Member #482 ? Mike, if you can't provoke the symptom by probing around the connector and it's leads, and you can't produce the problem by prodding the board itself, I'd be taking a good long look at the connector and socket. ? Is there maybe a small switch in the connector assembly that disconnects the internal PTT control line when a plug is in ACC2...? ? 73...Jordan... toggle quoted message Show quoted text ----- Original Message ----- From: Mike via groups.io To: [email protected] Sent: Friday, March 14, 2025 10:17 AM Subject: Re: [Kenwood-Amateur-Radio] TS-870S no TX No the cable wasn't plugged into anything else. ? When the fault is present none of the PTT functions works (MIC, ACC2, SEND, AT TUNE). ? I presume it's a standard 13 pin DIN socket so the cable plug should fit, but I can't tell if the problem lies with the pins or the shroud. ? -- Mike G8GYW
Mike All Messages By This Member #486 On Fri, Mar 14, 2025 at 08:29 PM, Jordan wrote: Mike, if you can't provoke the symptom by probing around the connector and it's leads, and you can't produce the problem by prodding the board itself, I'd be taking a good long look at the connector and socket. ? Is there maybe a small switch in the connector assembly that disconnects the internal PTT control line when a plug is in ACC2...? ? 73...Jordan... I don't think so because in the fault condition SEND and AT TUNE don't work either. ? -- Mike G8GYW
Mike All Messages By This Member #505 On Fri, Mar 14, 2025 at 03:40 PM, Jordan wrote: I've never seen a sticker covering any of the rear panel connections in any Kenwood I've seen, but I haven't owned or worked on an 870. Lots of 850s and 450s, but no 870s...It sounds more like an ACC2 connction problem than a rig problem... ? 73...Jordan Hi Jordan, it just occurred to me that maybe the dealer had identified a fault with the ACC2 socket and put the sticker on to indicate it shouldn't be used! ? I've ordered another 13 pin DIN cable from a different supplier to see if the poor fitting is due to the plug or the socket. I'm guessing the Kenwood socket is pretty much unobtanium ... ? -- Mike G8GYW
Jordan All Messages By This Member #506 ? Hi Mike... ? That's possible, I use the 13 Pin connector that came with my Kenwoods and wired the connections myself...73...Jordan VE6ZT toggle quoted message Show quoted text ----- Original Message ----- From: Mike via groups.io To: [email protected] Sent: Monday, March 24, 2025 4:32 AM Subject: Re: [Kenwood-Amateur-Radio] TS-870S no TX On Fri, Mar 14, 2025 at 03:40 PM, Jordan wrote: I've never seen a sticker covering any of the rear panel connections in any Kenwood I've seen, but I haven't owned or worked on an 870. Lots of 850s and 450s, but no 870s...It sounds more like an ACC2 connction problem than a rig problem... ? 73...Jordan Hi Jordan, it just occurred to me that maybe the dealer had identified a fault with the ACC2 socket and put the sticker on to indicate it shouldn't be used! ? I've ordered another 13 pin DIN cable from a different supplier to see if the poor fitting is due to the plug or the socket. I'm guessing the Kenwood socket is pretty much unobtanium ... ? -- Mike G8GYW
Mike All Messages By This Member #513 Hi Jordan, I bought an MFJ accessory cable with a 13 pin DIN plug on one end and it goes into the ACC2 socket easily. It looks identical to the other plug that doesn't fit so I don't know where the problem was. I can wiggle the plug in the socket and it doesn't drop out of TX so I'm hoping it will be OK now. ? Thanks for listening. ? -- Mike G8GYW
Jordan All Messages By This Member #514 ? No problem Mike....Glad you got it sorted...73...Jordan... toggle quoted message Show quoted text ----- Original Message ----- From: Mike via groups.io To: [email protected] Sent: Thursday, March 27, 2025 6:34 AM Subject: Re: [Kenwood-Amateur-Radio] TS-870S no TX Hi Jordan, I bought an MFJ accessory cable with a 13 pin DIN plug on one end and it goes into the ACC2 socket easily. It looks identical to the other plug that doesn't fit so I don't know where the problem was. I can wiggle the plug in the socket and it doesn't drop out of TX so I'm hoping it will be OK now. ? Thanks for listening. ? -- Mike G8GYW
Samuel W7STF All Messages By This Member #515 Mike, I don't know that you indicated the radio was mis-behaving when no cable was installed in the socket... As others indicated, the 13-pin DIN male should mate with the female socket EASILY. You have to make sure that the indent in the shield is located towards the ceiling, 12 o'clock... ? And not all 13-pin DIN cables are the same.? ? Even if the cable had nothing plugged into the other end, likely the cable wasn't straight-through, and several conductors/pins were at the same potential as GND (the shield). This could be verified with an ohm meter. Check the resistance between each pin of the suspect cable and the shield. If any of the pin to shield resistances are low, you've found the culprit. ? Glad you resolved your problem. Sam W7STF
Mike All Messages By This Member #516 Hello Sam ? I made sure that the indent was correctly aligned, the problem was the excessive amount of force required to push the plug home. I've thrown that cable away now to avoid problems in the future. ? Incidentally, on the TS-870 the ACC2 socket indent is at the bottom because the PCB is upside down in the chassis. ? -- Mike G8GYW

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