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TS-870S no TX
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Hello Sam
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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.
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Incidentally, on the TS-870 the ACC2 socket indent is at the bottom because the PCB is upside down in the chassis.
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Mike G8GYW |
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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...
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And not all 13-pin DIN cables are the same.?
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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.
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Glad you resolved your problem.
Sam W7STF |
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No problem Mike....Glad you got it
sorted...73...Jordan...
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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.
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Thanks for listening.
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Mike G8GYW |
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Hi Mike...
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That's possible, I use the 13 Pin connector that
came with my Kenwoods and wired the connections myself...73...Jordan
VE6ZT
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On Fri, Mar 14, 2025 at 03:40 PM, Jordan wrote:
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!
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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 ...
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Mike G8GYW |
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On Fri, Mar 14, 2025 at 08:29 PM, Jordan wrote:
I don't think so because in the fault condition SEND and AT TUNE don't work either.
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Mike G8GYW |
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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.
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Is there maybe a small switch in the connector
assembly that disconnects the internal PTT control line when a plug is in
ACC2...?
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73...Jordan...
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On Fri, Mar 14, 2025 at 12:27 PM, Gary Cook wrote:
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Thanks Gary, I will try that next time it fails.
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Mike G8GYW
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P.S....that cable should plug in quite easily...are
you sure it has the right pin spacing..?
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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...?
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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...
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73...Jordan
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On Fri, Mar 14, 2025 at 12:38 PM, Jordan wrote:
Jordan, it was a DIN cable with plugs at both ends. I did check that there were no shorts between the pins.
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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.
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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.
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Mike G8GYW |
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Is there anything connected to the ACC2 cable, or
is it just the plug...?
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Jordan VE6ZT
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? ----- Original Message -----
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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:
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HB9TC On Thu, Mar 13, 2025, 6:44?PM Mike via <mail=[email protected]> wrote:
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Mike,
Did you torque any screws on the board containing the Rx/Tx relay, or any metal shield covering portions of the circuitry?
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Sometimes these kinds of issues are caused by hairline fractures on a ckt board, and mechanically or thermally connections become intermittent. Mechanical Flakey.
Sometimes these kinds of issues are caused by cold solder joints, also impacted my mechanical or thermal stress. (Thermal Flakey).
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Now, it could be the Rx/Tx has pitted contacts such that the Common (c) center connection (Armature) does not shuttle between Normally Open (nc), and Normally Closed (nc) positions.
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Did you at least verify the Rx/Tx relay was firmly seated?
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Glad you got it working. Maybe it just wanted you to admire it from the inside.
Sam |
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Ok Mike...No problem...have fun with the rig and
feel free to ask questions should you have any....73...Jordan VE6ZT
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