Kenwood TS 940 PA Upgrade Part 1

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The Radio Shop
2344 April lane
Greenville NC. 27834
[e-mail]

[@scottlee1211]

Nothing like watching Buddy go through one of these radios and bringing it back to life! Thanks for the post!!

[@TheRadioShop]

Thanks for waatching

[@Jan_Talcott_100]

Awesome video Buddy. Always a pleasure to watch your videos.🙂👍

[@bachkhoa1975]

I watch your video with a lot of interest. Thank you for doing it. I recently acquired a TS940SAT which has a broken RF Final unit; I’m trying to figure out how to go about fixing it. Since the new PA board is elevated by the new, additional copper heatsink, washers or stand-offs need to be used at its 4 corners and 4 additional mounting holes else the board might be bent if the screws are over-tightened. At minute 24’, the thermistor wires are cut and there’s no longer a thermistor hooked up to the fan control circuit (IC1 and Q7, Q8 on the LPF unit board), I suspect the cooling fan is permanently disabled.

[@michaelclutton8446]

Thanks for the video, I have always enjoyed using this series of radios, I have owned my TS930 since the mid 80s. I must have thousands of hours on it.

[@TheRadioShop]

Great radios when they are working correctly. Thanks for the comment

[@bblod4896]

Woo hoo, a Labor Day Buddy video. 😎

[@TheRadioShop]

Thanks Friend

[@w.rustylane5650]

I used to have a Kenwood 430S but gave it away when I got my new Yaesu 991a. Love my Yaesu. Cheers from K9POW in eastern TN

[@stevent3450]

interesting about D51, it also lights in my Radio and it works fine, I saw that glow and thought it was a LED in an early special package so never checked it farther

[@PapasDino]

Thanks for showings the install Buddy...I've replaced the power supply in my 940 along with all the other updates...been waiting on the PA board just 'cause the radio isn't on the radio bench anyway. Look forward to see how you resolve the issue(s)! 73 - Dino KLØS

[@TheRadioShop]

Thanks Dino. Good job on the PS upgrade.

[@toolmanchris]

Buddy if you look at the picture of the board on the heat sink it tells you the black washers are for spacers 👍

[@TheRadioShop]

Yep it does lol. But who reads directions.. :)

[@toolmanchris]

@@TheRadioShop 😂

[@Brian-mp6bg]

@@TheRadioShop doing it twice doubles the fun 😂👍

[@truthreigns7]

very good, thank you

[@TheRadioShop]

Thanks for watching

[@dri50]

D51 appears on page 20 of the service manual in Figure 12. Looks like it is in the ALC circuit, specifically the area that drives the meter.

[@TheRadioShop]

Thanks for the homework! Will check that out.

[@GarthWheeler]

The carrier board

[@donalddavis581]

eliminates all the filtering. Should work great!

[@towerman75]

It's a shame about the PA transistors for I have 20 of them made by ECG new in the original packs of when I ran my Communications business. I'd be willing to trade for some repairs.

[@ukrainehamradio]

Is this radio really worth the new parts and repair costs which exceed its initial price?

[@josealeixes2861]

Hi good evening, I have a Sony CRF-320, could you review and align it for me, I'm waiting for your response, thank you.

[@carl112466]

The new RF Transistor is not MRN101AN it's MRF101AN they cost about $27 + shipping from Mouser RF MOSFET Transistors Wideband RF Power LDMOS Transistor, 100 W CW over 1.8-250 MHz, 50 V

[@TheRadioShop]

You are correct Carl, I still could not read it. Thanks for the correction.

[@Robalo844]

i have 5 of those radios and none of those work 😭

[@TheRadioShop]

None work? Time to get busy. What problems do they have?

[@Robalo844]

@@TheRadioShop one is pa problem,one the dot problem,one rx and tx but no audio on speaker the other two I don’t remember but I think is the drivers on the pa and the last one power supply issues

[@Pushyhog]

im dumb as a dog dick nat, but l like watching this. I bet channel could really tweek my cb. Thanks mister, u help alot of smart people.

[@TheRadioShop]

Thanks for stopping by

[@josealeixes2861]

I have a radio , Sony CRF 320 , it’s needs a full service etc , please can you do this for me , please send your address and post code , thank you , Phil

[@hi......................636]

I put my money on the coax from the rf unit being in the wrong place

[@TheRadioShop]

I think that is a great guess...

[@terryfelster1484]

I really like your videos, but they are few and far between. Every day I look for a new video and im disappointed.