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Kenwood & EF Johnson Forum - For discussion of land mobile radio products manufactured by Kenwood or EF Johnson. For discussion of Kenwood Amateur Radio Equipment, please use the Amateur Radio Equipment forum.

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Old 08-06-2016, 5:40 PM
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Default TK-840 Programming Error

I'm trying to download the programming from a TK-840 and the software gets as far as block 3 to 12 then loses connection. The same setup worked fine for 2 other radios so I don't think it the computer or cable. I checked the ribbon cable ends from the head and they look fine. Any suggestions?
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Old 08-06-2016, 6:01 PM
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Tk-d840? The Dmr radio?

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Old 08-06-2016, 6:03 PM
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Old wideband LMR TK-840-1. No digital on this one.
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Old 08-06-2016, 6:09 PM
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KPG 49 I think. Make sure you clean the contacts, had issues with those at times.

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Old 08-06-2016, 6:11 PM
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What's a good method for cleaning?
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Old 08-06-2016, 6:32 PM
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Use a pencil eraser, and some rubbing alcohol, lightly buff each pad. Also, to my mind, you might have to use a slower PC, or laptop, and DOS. The waistband ones I think after version 2 would use the windows version. Version 1 needs dos, and a slow processor. imsmr

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Old 08-06-2016, 9:05 PM
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Coincidentally, I just had to (re)program a TK-880-1 and a TK-840-1 this evening. I have a WinXP machine here for these two radios and Motorola CDM series.

Man running the KPG-25D software in a DOS Box is a massive pain in the posterior. I use an FTDI USB cable and have to reassign the automatic COM 5 the driver assigns to COM 2 so the software will connect.
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Old 08-06-2016, 9:34 PM
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Lightbulb Check Settings

After cleaning the contacts, swapping heads and boards, I determined the programming is stored in the board between the head and radio body with the mic connector. That didn't work so I tried another radio which worked previously and couldn't read it. It wouldn't write either so I checked the COM port settings and it was at 115,200 bps. Reset that to 9600 and Xon/Xoff which fixed the 2nd radio communication so went back to the 1st. Still couldn't read so gave up and wrote over what was in there. It must have gotten corrupted during one of the read failures or power cycles. Moral of the story: Check your COM port settings before troubleshooting further.
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BCD396XT, BC245XLT, Pro-164, & Bearcat 880 CB
Fleet of Uniden PRO510XL and
Midland 1001LWX, 75-785, 75-822
SELLING fleet of TK-880, 840, 3173, & 3160
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Old 08-06-2016, 9:50 PM
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Great! That's one of the reasons I mention the com ports in my reply.
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