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R4C need PCB foil diagram

Jay W6CJ All Messages By This Member #81163 Looking for a PC board foil diagram that shows the connections to, and around the R55 bias pot.?? Thanks & 73 Jay W6CJ
Evan All Messages By This Member #81166 Jay, You might want to id which of the three production runs/models you have in case this board is one of the "variables". 73, Evan, K9SQG On Friday, December 20, 2024 at 02:48:04 PM EST, Jay W6CJ via groups.io <lastradioman@...> wrote: Looking for a PC board foil diagram that shows the connections to, and around the R55 bias pot.?? Thanks & 73 Jay W6CJ
Jay W6CJ All Messages By This Member #81167 Evan & Group, Here are some photos of the R4C s/n and PCB. Had an issue with a flaky S-meter adjustment and saw missing foil traces near R-55 (blue 2-legged pot). My clumsy hands knocked off whatever jumper(s) a tech had installed near R-55 to replace the missing traces.? ? I'm trying to get it back together, and finish the S-meter alignment. Thanks & 73 Jay W6CJ toggle quoted message Show quoted text On Fri, Dec 20, 2024 at 12:28?PM Evan via <k9sqg=aol.com_at_groups.io_lastradioman@...> wrote: Jay, You might want to id which of the three production runs/models you have in case this board is one of the "variables". 73, Evan, K9SQG On Friday, December 20, 2024 at 02:48:04 PM EST, Jay W6CJ via <lastradioman=[email protected]> wrote: Looking for a PC board foil diagram that shows the connections to, and around the R55 bias pot.?? Thanks & 73 Jay W6CJ
mike bryce All Messages By This Member #81168 开云体育 This is one of the reasons why I don’t care to work on the R4C. I know space was a premium, but damn, getting to the bottom of most of those boards even to make voltage checks is a PITA! mike wb8vge The Heathkit Shop toggle quoted message Show quoted text On Dec 20, 2024, at 3:28 PM, Evan via <k9sqg@...> wrote: Jay, You might want to id which of the three production runs/models you have in case this board is one of the "variables". 73, Evan, K9SQG On Friday, December 20, 2024 at 02:48:04 PM EST, Jay W6CJ via <lastradioman@...> wrote: Looking for a PC board foil diagram that shows the connections to, and around the R55 bias pot.?? Thanks & 73 Jay W6CJ
Jay W6CJ All Messages By This Member #81173 Evan, Mike & Group, Nailed it. The PCB beneath R55 (bias pot, and part of S-meter calibration) had missing traces and a past 'repair' was intermittent. Cleaned up the rosin mess and bypassed the missing traces with wire.?? Tnx & 73 Jay W6CJ On Fri, Dec 20, 2024 at 4:01?PM mike bryce via <prosolar=gmail.com_at_groups.io_lastradioman@...> wrote: toggle quoted message Show quoted text This is one of the reasons why I don’t care to work on the R4C. I know space was a premium, but damn, getting to the bottom of most of those boards even to make voltage checks is a PITA! mike wb8vge The Heathkit Shop On Dec 20, 2024, at 3:28 PM, Evan via groups.io <k9sqg@...> wrote: Jay, You might want to id which of the three production runs/models you have in case this board is one of the "variables". 73, Evan, K9SQG On Friday, December 20, 2024 at 02:48:04 PM EST, Jay W6CJ via groups.io <lastradioman@...> wrote: Looking for a PC board foil diagram that shows the connections to, and around the R55 bias pot.?? Thanks & 73 Jay W6CJ
jerry-KF6VB All Messages By This Member #81174 On Fri, Dec 20, 2024 at 4:01?PM mike bryce via groups.io [2] <prosolar=gmail.com_at_groups.io_lastradioman@...> wrote: This is one of the reasons why I don’t care to work on the R4C. I know space was a premium, but damn, getting to the bottom of most of those boards even to make voltage checks is a PITA! *** There's worse. My FTDX10 has a problem with CAT control over USB. The responsible circuit area is under this single giant board at IIRC the bottom of the radio. To get at it, you have to undo an absolute boatload of connectors around the perimeter of the board. Once you do that, the board doesn't work. And there is NO way to get at it to troubleshoot it. Doesn't help that the traces are SO tiny. We're talking "work on it with a microscope" tiny. I consulted with Tim at Yaesu support - they don't fix'em either. Just replace. About a grand...kaChing! Luckily, CAT still works via an RS232 port. - Jerry, KF6VB
Gary WB6OGD All Messages By This Member #81178 On Fri, Dec 20, 2024 at 06:24 PM, jerry-KF6VB wrote: I consulted with Tim at Yaesu support - they don't fix'em either. Just replace. About a grand...kaChing! OMG!? Those aren't HAM radios anymore.? Aren't those only about $1200 new (with a warantee)? Throw away radios.. just like cell phones and all new gadgets. I am sure loving my old ancient Kenwoods and Drakes...? easy and cheap to fix, modify and enjoy! ? 73, Gary WB6OGD ?
Steve Wedge, W1ES/4 All Messages By This Member #81180 I have resorted to disconnecting the board by removing the wires and leads., rather than have to navigate a 700° iron down to the bottom.? The design was still, overall, 1950s/60s. With circuit boards that were hard-wired together.? It is less work to remove the board that try and repair all of the melted wires.? 73, Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS toggle quoted message Show quoted text On Fri, Dec 20, 2024 at 19:01, mike bryce via groups.io <prosolar@...> wrote: This is one of the reasons why I don’t care to work on the R4C. I know space was a premium, but damn, getting to the bottom of most of those boards even to make voltage checks is a PITA! mike wb8vge The Heathkit Shop On Dec 20, 2024, at 3:28 PM, Evan via < k9sqg@...> wrote: Jay, You might want to id which of the three production runs/models you have in case this board is one of the "variables". 73, Evan, K9SQG On Friday, December 20, 2024 at 02:48:04 PM EST, Jay W6CJ via < lastradioman@...> wrote: Looking for a PC board foil diagram that shows the connections to, and around the R55 bias pot.?? Thanks & 73 Jay W6CJ
Jay W6CJ All Messages By This Member #81182 You ship your brand E, I, K, or Y radio for repair and they charge you just to look at it. Guess what they are going to tell you after charging you to look at it: (A) non-repairable (B) parts availability issue Nice scam. 73 de? W6CJ On Fri, Dec 20, 2024 at 8:45?PM Gary WB6OGD via <winbladgary=gmail.com_at_groups.io_lastradioman@...> wrote: toggle quoted message Show quoted text On Fri, Dec 20, 2024 at 06:24 PM, jerry-KF6VB wrote: I consulted with Tim at Yaesu support - they don't fix'em either. Just replace. About a grand...kaChing! OMG!? Those aren't HAM radios anymore.? Aren't those only about $1200 new (with a warantee)? Throw away radios.. just like cell phones and all new gadgets. I am sure loving my old ancient Kenwoods and Drakes...? easy and cheap to fix, modify and enjoy! ? 73, Gary WB6OGD ?
jerry-KF6VB All Messages By This Member #81190 On 2024-12-21 06:13, Jay W6CJ via groups.io wrote: Throw away radios.. just like cell phones and all new gadgets. I am sure loving my old ancient Kenwoods and Drakes... easy and cheap to fix, modify and enjoy! *** Indeed. I had a QSO on one of the forever discussion groups on 40M. The net control was flabbergasted that I had managed to fix a Signal/One. I tried to explain that it was really a fairly straightforward radio, and nowhere near the same ballpark of difficulty as the modern stuff, which generally consists of: 1 big board... with a giant 200-pin ASIC in the middle. - Jerry, KF6VB

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