Wow. So much work just to fix a solder joint - not to mention the work that went into alignment. Your knowledge, skill and patience shines through yet again.
Isn't it Occam's Razor that says the simplest solution is the most elegant? Or something along those lines. Wish I could say the same for my 735 here. Stuck on XMT! W0XO
I’m an original owner of my IC735. I had a problem with intermittent connection to the center pin of the SO-239, and Icom designed it with a metal pin to go from the center of the SO-239 to the board. I replaced it with a short piece of stranded wire I had handy, to allow flexibility and no problems since. I also replaced the display backlights with clear white LED’s. I didn’t use any green filters, and left it. It gives the display a silver/gray look and is very easy to read. I had a problem with intermittent audio on transmit at one time, and found it was just the mic gain control needed cleaning. One shot of cleaner and no more problems. Amazingly I still haven’t needed to replace the back-up battery. I’ve turned it on after months on the shelf and it comes back on with all memories still there. It’s still one of my go to radios for Field Day every year. Dave K7DR
Peter, you were in very good form and almost mischievous at the start of this video. Your sense of humour really came through in this one! Keep it up. Very informative as per usual. 73, Brian EI8EJB
Hello Peter. I have one of those units passed on to me by my deceased mentor VE5CR it has no power output on SSB it does output on FM and AM at all plus it is most likely way out of alignment as well. If you can save it I would be very happy. My call is VE5RUS You are a very good radio tech guy. Clair was a microwave tech himself and kept this rig running perfectly in the past. IN honor of him i would really like this rig resurrected. Do you still fix these in 2022?
Hi peter you had your work cutout with many problems with solder joints the alignments takes time and patients which are important to be properly adjusted to get the right results you had so much to set up and we see another success well done :)
Great work Peter as usual. I was at the bench too today..... Drake TR7 with a vco issue. Got that sorted out and it ran all day. Listening to 80 while I was cleaning up the tools, and the receiver dropped out. More digging required. Not an easy rig to work in. 73 de George
Nice repair Peter, thanks for sharing. When you were moving the rear panel RCA connector up and down to demonstrate the intermittent it appeared that the PCB was flexing quite a bit; maybe you had already removed some screws holding it in place. It really moved a lot! 73 - Dino KL0S
Hi! In Norway we have a qst every saturday with old radios on 3.660usb Mhz. The radio must be over 25 years old, and many of the hams useing this radio the Icom 735. I have an old Icom 725, and I always get in to that nostalgic ring. You are welcome to visit it if you want. We begin at 14:00 UTC every saturday. The callsign of the ringleader is LA2old. Thanks for Your very informative videos. The best from LB1NH Arild in Oslo Norway.
I hated my 735, it had endless cold solder joints in it, and it would randomly lose audio, PA fan, receive sensitivity, etc. Finally, I had enough when it started blowing fuses when I keyed it up, regardless of power settings. I traded it in on a Kenwood, TS-450SAT. I loved that radio, zero problems and much better receive audio too.
It was a pleasure, Peter. This "old boy" can do its work for another 25 years or so, maybe some caps to be swapped. Sure, not the worlds best radio, but it does its job quite good, and so you did, too ;-)
Thanks for the video. I've owned one of those rigs for years and its been great but has developed a similar fault. Looking at rekindling the love affair!! 73's
What an Absolutely Brilliant vidclip .... I have 2 off IC-735 Units and they BOTH have Very Different issues/problems. I am not sure just where you are, I am in New Zealand and think that you are way to Far for me to tranport them you You .... Sadly .... :-) :-) :-) Very Best to You and Yours, Cheers from Christchurch, NZ
My ic-735 was normal and started to have a problem with reception. Some days it worked normal. The smeter indicates a lot of signal but I don't hear the stations or I hear very low. I disassembled the radio and found a lot of cold solder. After redoing the welds and assembling the equipment, the reception did not return to normal. Is there a specific component that I could test?
I always felt like things like RCA jacks, SO239's and others should not be fixed to the PC board and this is why. They should be secured to the chassis. K5AZE
That's the way it's done on IC-7300. The SO-239 is screwed to the chassis and there's a small clip soldered to the PCB. The clip is holding the center pin of the SO-239.
I find one point that I would have to disagree with you on. When adjusting the PLL (LPL) at around 50:00 into the video, you are not only looking for 40 millivolts minimum, the manual says right above that "maximum", so you should have set L39 thru L44 at their maximum level..
I have one of these radios and the bottom part of the LCD display is out. It seems like it shows when the radio is first turned on but after a few seconds it fades out. What causes this?
Hello 9zapa I'm having a problem with my icom 735 it powers up everything seems to work but I am not getting any transmit and receive, the tx/rx icon lights up I'm getting static on receive I'm not techno savvy please help thanks.
Hello I own a nice condx 735 I didn't use for 3 years due to covid and not being to go to other qth I plugged it in and a small puff of smoke came from bottom Suspect bad cap Took apart radio carefully examined 3 or 4 times everything Don't see any thing bad The radio will turn on but the switches modes and memory to vfo back and forth by itself The memory battery cr232 is dead but don't think that would cause it Anyone have any ideas? 73
Nice video. May I bring to your attention that near the first 30min of the video where you make frequency measurements, the radio is off by tens of hertz, not hundreds... probably you got confused at the moment. no worries.
"one must really love these older radios to put this much work into them" or, one might really love the savings of not spending a grand or two to replace it :o) I love working on my own radios but only have a bk counter and vom, don't have anything near your great setup.
Hi Peter have you or anyone ever had problems with an IC 7100 going off when you key the mic, even on a dummy load on 80 mts only, tnx from Fred g4vvq, nice video.
Check the fuse holders on the Power cables. Over time from constant expansion and contraction, the fuses actually become loose in the holder and can cause the radio to shut down when you key it. 73
Come on guys....they are not that old.........how many 101's are still out there going......it would be thousands of them, so this is a "New" radio lol
That is a terrible design on the rear panel with the phono connectors. They should be secured to the back panel with washers and nuts and not just relying on the solder connection for mechanical security. That radio was built to a price point I guess so to be expected.
greeting bank .. a hug thanks for your good knowledge ... I have an ic 735. problem is no total rx does not synthesize, service manual review. ic 17 (sn36514) pin 5 minimum 40 mV not good output voltage 2 volts.
