Hi Rex,
I to purchased my 301 complete station near the end of 301 availability(1979). I too purchased extra displays. Your hypothesis is interesting but I believe that these fail to to expansion and contraction and could be a wire bond issue. Anything that you might have stored and not used expands and contracts do to the environmentAl temperature changes powered or not. Of course ON OFF is by far the worst for these displays. If you have a 301 just leave it on as long as your room is not hot. If you store it it should be a location that does not charge a lot with temperature like a closet in the middle of the house or a dry damp free basement, I know basement and damp free might not exist. You could also place a diode in series with the display power to reduce the voltage a slight bit.
But all I can say the Beauty of the original displays are much nicer than any thing that you can buy these days. Nothing sparkles like the original ones. Never understood why people are selling their displays unless they are selling all of their 301 stuff. I would be more than happy to purchase more.
Your thoughts would be great. I think these type of conversations help a lot of people that love these radios and want to keep them as original as possible with their yellow inconsistent lamps.
Regards,
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On Oct 16, 2022, at 12:19 AM, Rex K0KP <rex@...> wrote:
?Concerning the display chips and the FT301D.? It was perhaps two years after obtaining my 301D in 1977 that my first display chips failed.? I ordered some new replacements and corrected the problem.? I found that if the rig was used day after day the display chips lasted several years.? I noticed when the rig was shut down for an extended period of several months to several years there were always segments out when I repowered the rig.? Then I began to notice that even a few of the brand new chips had defective segments.? This got me wondering; could "whiskering" which was a fairly common problem of the 1970's area be the culprit?? Some materials in chip, pcb, and discrete component production would grow little bitty whiskers that would short and take out delicate electronics.? NASA and others lost a number of satellites due to whiskering problems in space.? The US military loss due to this is still classified.? The little whiskers can be inside components, outside components, around pcb traces and so forth.? Why else would brand new TIL chips that hadn't been in circuit nor had they suffered any heat mysteriously show up with the same kind of segment problems as the ones operating for several years installed in the rig?? Fortunately I have enough spares on hand that I can sort through them to get enough good ones operating correctly.? I picked up a stock of them back in the day "just in case."? :-)? This is open for discussion but I think the problem was a manufacturing defect perhaps the well known whiskering problem and not related to burn out and so forth.? Parts don't burn out that are sitting in storage, but whiskers do grow in storage sitting on the shelf.? ? ??
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The TIL-308’s are SOLD PENDING FUNDS RECEIPT
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I will sell the 6 TIL306’s for $40 shipped conus. I have 2 working TIL308’s for $25 shipped conus.
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Concerning the display chips and the FT301D.? It was perhaps two years after obtaining my 301D in 1977 that my first display chips failed.? I ordered some new replacements and corrected the problem.? I found that if the rig was used day after day the display chips lasted several years.? I noticed when the rig was shut down for an extended period of several months to several years there were always segments out when I repowered the rig.? Then I began to notice that even a few of the brand new chips had defective segments.? This got me wondering; could "whiskering" which was a fairly common problem of the 1970's area be the culprit?? Some materials in chip, pcb, and discrete component production would grow little bitty whiskers that would short and take out delicate electronics.? NASA and others lost a number of satellites due to whiskering problems in space.? The US military loss due to this is still classified.? The little whiskers can be inside components, outside components, around pcb traces and so forth.? Why else would brand new TIL chips that hadn't been in circuit nor had they suffered any heat mysteriously show up with the same kind of segment problems as the ones operating for several years installed in the rig?? Fortunately I have enough spares on hand that I can sort through them to get enough good ones operating correctly.? I picked up a stock of them back in the day "just in case."? :-)? This is open for discussion but I think the problem was a manufacturing defect perhaps the well known whiskering problem and not related to burn out and so forth.? Parts don't burn out that are sitting in storage, but whiskers do grow while in storage and sitting on the shelf.
https://nepp.nasa.gov/whisker/reference/tech_papers/2006-Leidecker-Tin-Whisker-Failures.pdf
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?
? Hi Rich here,
? I have an FT-301D package for sale. I’ll never get around to repairing it as I don’t have the time nor patience anymore.
It consists of a FP-301D ?with the ID option and clock, that appears to work. The FV-301 external VFO untested, the YO-301 Monitor Scope (appears to function) and the FT-301D. The radio does not RX or Tx, but does turn on and the vfo tracks and band changes reflect properly. One small segment on the display is out and the light behind the meter is out. No mic included, the power supply has the cinch Jones on it. A matching
phone patch is included as well but Is not shown. Make an offer plus shipping to my QRZ email or come pick it up in central Florida. Can meet within reason. I don’t want to break this up if I can avoid it. A reasonable offer and it’s yours, as always trades considered lol.
Thanks Richy N2ZD?
   
? ?Consider this for the options, parts value or repair it.?
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Gene:? I would like to buy them.? How much?? Thanks, Bob? robertisselhard@...
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Re: New owner of a project 301D
On Fri, Oct 14, 2022 at 01:17 PM, James Mounts wrote:
Another option is there is a fellow in Italy selling a replacement display on eBay.?
I installed mine last year and works great. Bought from the same fellow in Italy. GL N4FZ? ? 
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Re: New owner of a project 301D
Another option is there is a fellow in Italy selling a replacement display on eBay. I purchased (2). I haven't installed it yet but there is plenty of information about it here:
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Hi Jim,
Thanks for uploading that manual very helpful. I have a 301D that has a newer version AM PCB PB-1556E.?My manual only shows the older version without the switch. When trying to make FSK adjustments this switch needs to be switched up and down for proper alignment. I figured it out but it would be nice to have the confirmation from the Japanese manual but it’s not in English.
If anyone has the English manual that shows the AM board with switch please upload. The manual uploaded must be a newer manual to capture the newer AM PCB.
Thanks,
Michael
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Re: New owner of a project 301D
Hi Robert,
It’s easy to grab the frequency with a scope probe from the center pin of the pot in the carrier balance section. You’ll need an accurate counter that should be tide to a gps frequency standard.
With the audio generator you should have no more than 20mV, mine will not go any lower than 34mV. Once that’s set you’ll adjust your power at the mic gain pot located right behind the meter on the skinny PCB, it’s the far left pot. Audio set for 1khz turn mic gain pot for 50watts. Then change to 300hz and adjust each side band for 12.5watts.
For me this never really adjusted correctly for what ever reason, do I just set the frequency instead. If you have issues getting to the frequency’s you’ll need to replace the 39pf to a slightly lower value, 20 or 10. Actual frequency should be in the middle of the trimmer frequency swing. These xtals are old and are drifting. On my AM PCB I had a bad xtal no out put on AM.
When I adjust this way the audio sounds the same when switching from lsb to usb.
Be interesting to hear from others on this,
Michael
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Re: New owner of a project 301D
i also have that same question. In addition to that, they do not specify how many mili volts the audio generator should be set to.
If setting the crystal frequencies with a counter, I would prefer to do that.
Robert..?
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Re: New owner of a project 301D
Hi Emerson,
Elcon is a very nice display but you loose the clear sparkly look of the digit’s. If you want to stay with the original look there are enough of the old ones floating around. Although more work you could add a secondary PCB to the Elcon PCB to be able to run the til303 and til302 displays. These have the same look as the til 306,307 and 308s.
Question for you regarding x501 and x502 on the AF board. Doing the SSB point adjust with 1khz and then 300hz never really worked for me. Instead I used a very accurate freq counter and adjusted for 8998.5 and 9001.5. Do you see any issues with this method.
Also on a side not these xtals have drifted over time so I had to change the 39pf caps to between 10 and 20pf to be able to reach the right freq..
Thanks,
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On Oct 6, 2022, at 3:47 AM, emerson <bunhoel@...> wrote:
? Dear? Chris
Around two years ago, I start a restore of a FT-301d.
The FT-301 manual have enough information that can help you. The display is really a problem.? The best advice, if possible, is to buy a new from
About LSB and USB, the idea is to check both oscillators.
Another advice is replace tantalum capacitors c60 and c61 of 6u8 located at the chachi, before them burn out. The power voltage is 13V5, not 13V8 or 14V.
73 PP6EW Emerson
Em qua., 5 de out. de 2022 às 13:52, elkhider via <elkhider= [email protected]> escreveu: Good morning all you smart people!
At a recent hamfest I bought a poorly 301 for a whole $10. The tag said "bad display" but when I powered it up the display was working, except for 2 segments of the .0 section, no biggy there. What I found is that the display never changes in response to the VFO. It changes bands and displays the bottom of the band, but doesn't move from there. Also, on the lower bands like 80 and 40 I can get audio from USB, but not LSB, and above those frequncies I get sound on LSB but not USB. Contrary thing I guess. Since Yeasu apparently never released an actual service manual I'm wondering where to start with the beast??
I've pulled a few boards, gave the connections a deoxit treatment, it's amazingly clean inside for being such an old radio.
Cheers Chris N8FF
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Hi Jim,
Any ideas on translating to English?
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On Oct 11, 2022, at 4:09 AM, Group Notification <[email protected]> wrote:
?
The following files and folders have been uploaded to
the Files area of the [email protected] group.
By: Jim <james_buttons@...>
Description:
Japanese version of FT-301/S. Even though in Japanese, the schematics are good and are for very early (s/n) of the 301 (non D) & S versions. Allso contain schematics of front panel analog LED indicator
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The output of the IC is ok. The problem is with the two switching transistors.
I dont know why they are using 2 NPN transistors to switch the relay !!
There is a diode between them. I dont like the way they did it. I tried 2 2n2222.
I had to re-arrange the leads. now, when I key, it hangs !!? They are just switches so it should be simple.
since I have to work with what I have here, I will try a 2n2222 (NPN) and drive a 2n2907 (PNP). That should do it, I hope.
I am working on two ft301 at the same time. :))?
Robert KH2BR
?
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Re: where is the 6 volt regulator that powers the VFO
Thanks Emerson, I found it !!? I also found why the VFO was not powering up ! Who ever was working on it prior to me had removed the power wire.
It was not there !! I gave it 6 volts regulated and got the VFO working. Now I will press on and repair the other problems..?
Thanks a lot !!
Robert KH2BR
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Robert
I had been a problem with 4011bB (q604). I replace it.
The pulse? that trigger 4011 should not to overcome 5v.
Emerson
Em seg., 10 de out. de 2022 às 17:47, Robert Holsti < kh2br.w6@...> escreveu:
I found the microscopic part number and it is a PB1685
This board was in a FT301S. . any schematics for this one??
relay control is provided by a quad 2 input nand gate which drives a npn transistor and in turn switches another? npn transistor on which then activates the relay. I had to sub out the 2sc372 and 2sc735 with 2n2222a. it worked for a while then quit, so I am getting some where. Now, it hangs in tx. I will undo what I did and check the output of the gate.
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Re: where is the 6 volt regulator that powers the VFO
Robert
The 6v comes from the IF Unit PB-1436. Verify it.
Emerson PP6EW
Em seg., 10 de out. de 2022 às 23:36, Robert Holsti < kh2br.w6@...> escreveu:
I need help in finding the 6 volt regulated power source for the VFO. Been thru the schematic many times and cant find it.?
Thanks,?
Robert
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Hello Robert.
I just uploaded a Japanese version of the 301/S. The echematics & diagrams show very early models. This one also shows the analog LED indicator schematic for non-D models which is not present? in more recent D model manuals.
Hope this helps, it helped me with one of my 301S units.
Jim
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The following files and folders have been uploaded to
the Files area of the [email protected] group.
By: Jim <james_buttons@...>
Description:
Japanese version of FT-301/S. Even though in Japanese, the schematics are good and are for very early (s/n) of the 301 (non D) & S versions. Allso contain schematics of front panel analog LED indicator
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where is the 6 volt regulator that powers the VFO
I need help in finding the 6 volt regulated power source for the VFO. Been thru the schematic many times and cant find it.?
Thanks,?
Robert
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Michael K.
Richy Russo N2ZD
James Mounts
