HELP? What's Wrong Wtih my IC-7100? 

It’s probably a relay in the output filter section stuck in the open or closed position. This is a 13 band radio and 7 filter segments, so it’s likely that the radio “builds” the correct filter out of the segments based on frequency selected. It’s also indicated by the bands that trip the power protection 20, 40, 80. That suggests a common element.

A worthwhile check might be to lower the output power on HF down and see if it resets… if it doesn’t.. crank up the power until it does. If you get like… 30-50W out… before it shuts off… check for any high resistance joints or bad connections in the power lead.

Full reset. Save all settings beforehand. SARTS in west michigan is the place to send it. Check the plug in line fuse connections. I eliminated those fuses (if not mobile). However, it seems the voltmeter on the radio stays above the critical (~10vdc) level when transmitting so they are prolly not the issue.

If you decide to send it off, the ICOM repair in Michigan is who I would suggest. Besides repair, they can bring up the unit up to current specs.

On late-model Icoms, pressing the PTT in CW won't generate any output. That just puts the radio into transmit, but you won't get any power output until you key the radio through the CW keying jacks. Just tried one of my IC-7100s (I have two). In CW mode, no output when PTT pressed. In RTTY mode, full output when PTT pressed. For that reason, I usually test radios for output using RTTY, FSK, or FM modes as they all should produce output when keyed with PTT. The IC-7100, like most Icoms, is sensitive to supply voltage. The fact that in your video, the radio shut down and the battery's circuit protection popped when you keyed in RTTY tells me that you don't have enough voltage or that the radio is pulling so much current when transmitting that the voltage drops so far that the radio's CPU resets. When you have the full metering screen displayed, there's a voltage indicator on the right ("Vd"). The scale has a solid line with ticks at the ends followed by a dotted line. If the voltage drops below the rightmost tick when transmitting, you don't have enough voltage. Adjust the power output level down from 100% to see if you can find a point where there's enough voltage on transmit to keep the radio from resetting. Possible sources of low voltage are 1. your battery can't deliver the current that you think it can or 2. there's a significant resistance in the power cable. As a test, put the radio in RTTY mode, dial the power output down to 25%, and then key the radio. If you get output, then you may have a problem with your battery. If the battery seems to check OK, look at your power cable. Any corrosion or frayed wiring at connectors could be a problem. The Icom power cables are notorious for fuse holder problems. Pull the fuses out, clean the contacts, maybe tighten the contacts a bit with needle-nose pliers, and put things back together to see if you eliminated the resistance and resulting voltage drop. If you decide to send it for service, SAR Technical Services in St. Joseph, Michigan, is an authorized Icom repair center. He's very honest and does good work. www.sarts1.com/

Always check power out in RTTY mode, not CW (when using a microphone). The reason it powered off in RTTY mode is because your 12v supply cannot supply the required current. Hook up a good 30 amp power supply, in RTTY mode and retest

You could check finals using transistor checkers; that is one thing. What I can see is an impedance short, something that shorts to ground at a specific frequency, an overheated core, and melted-down insulation on those transformers. Some caps nearby the finals or after the finals could dry out. I can only guess as I'm not familiar with that icon. Do you have any LCR that works with soldered caps? Remember to discharge them before measure.

Steve, from what I saw in the video it looks like a logic malfunction in the bandpass filter on the rig. If I'm reading it right, I also see that the ALC on the display is all the way up in both RX and TX. This could be the result of something external plugged into the rig and/or possibly a shorted component on the ALC buss line inside the rig. Listen to see if you can hear (or feel) the relays in the BPF (band pass filter) switching when you change bands in RX. At 3:37 looking at the PCB, I think I see a toroid (upper row on the left, next to the green toroid). The one on the left looks like it may have got hot, but I can't really tell from the camera angle. Look at it closely for discoloration under the windings. When you went to 40M and the rig shut down the battery, it would be good to see the radio display as we saw at the beginning of the video where it shows Id (drain current) on the bottom row. I'm presuming you don't have a DC clamp meter. Hope that helps. I know how difficult it is when you don't have all the test gear and a normal workbench available. If I can assist, you know how to reach me. 73 OM

I had a similar issue with my 7200 key down on any band that was max output it would completely shut the radio down. I googled it, and it turned out to be mild corrosion just a slight tarnish) on my in line fuse of all things, seems to be fairly common. When running at max output there was just enough corrosion/tarnish to allow a voltage drop causing the radio to shut down. I pulled and re-seated the fuses and everything back to normal. I replaced the fuses just to start fresh. 73 DE N7BYD

Try TRX Lab “icom ic-7100 no transmitt on shortwave” looks like it might be the exact same problem. Lance

Hi! Check out V/U PA transistor surroundings, possibly with magnifying glass and try to look through IR camera there. I have blown mine beacuse of joints temperature related deterioration. One of the early symptoms were slightly elevated SWR even on 50ohm dummy load and too high temperature when V/U transmitting. Next there was significant drop at V/U output like in this film. Grande finale was lotsa smoke and even flames during UHF chat and whole place when final MOSFET sits went carbonized (PCB also) with other elements unsoldered and blown into ash. This was probably due to prolonged FT8 operation on V/U and whole process lasted 2 or 3 years of continuous use. Not so significant changes at start but end was brutal - friend of mine managed to reconstruct PA but smell will last until ICOM company falls down the mud. My story is about V/U part of rig, HF will be probably another story, 73!

Transistor checker will tell you gain. If you had one Mr BBI always checks his pills with one 😊

I placed my 'Golden Screwdriver' next to my 7100 to serve as a warning I'm ready to do the unthinkable if necessary. Fear is a powerful motivator and failure is not an option!

Ok Steve some good ideas but the first thing I check is the fuses the the earth on the board.Then in FM check 10 m after that is the 2 10k resisters on the out put .If you have to sent it back hope in warranty if not the board is about $400 73 brother

That's a real shame. I really like my 7100 also. It needs the optical reader replaced so I'd like to hear about good repair shops.

replace the fuses even if they appear good. i had the same trouble with a ic756 and it was the fusses.

First, try to get a service manual with schematic. Icom had one for my IC-7000 online. Are the drivers MOSFET or bipolar? Knowing that while ohming helps. Are the filters series cap or series inductor? Maybe a bad cap in a filter. Some bands pulling power down suggests filters. [ETA] Band filters are bandpass, but check filter caps for shorts [/] The 100ah battery probably allows 100A which is crazy; I would expect massive smoke...unless a finals transistor is already slag. Its amazing how much current a melted power transistor can take. And they don't get hot because its a short (this from someone who has debugged many comple multi-phase switching supply failures).

Is it the same battery set up? Probably not the battery but I like to eliminate things. Especially easy things to test. Be nice if it was a battery issue instead

Steve, the only thing I've experienced that can cause a shutdown like that is insufficient supply voltage. I've shortened my power cord to about 18". Reseat all your fuses including the internal yellow one and see if that helps. 73 VE3GKT

Did you try turning the power down to 10 watts to see if it worked at lower power?

Have youtried in CW or RTTY modes? SSB produces minimal power out unless there is modulation input. Went to use the 706 in my truck on 70cm FM the other day and nothing to my YL standing 30 feet away. No receive either. Need to dig into that now.

Completely unrelated department: As a career AF and one time crew-chief I am intrigued by the "Remove before flight" streamer that appears to have spent some time on the flight line. Meanwhile I was about to pull the trigger on buying one of these but think I will wait to see if you come up with a fix.

Oh man...that sucks! I am sure you will get it up and running soon!....I may be way off and also i am no expert, but just to help...is it possible that the hf so239 has developed a bad solder joint due to some reason? Or i guess you already checked that...let us know how it turns out.

I had a similar situation on field day, but it was due to going back and forth between digital and SSB and it was not keying up on SSB. Check your MIC USB and ACC settings just to be sure.

My guess is the 2m/70cm probably uses a different set of finals. If it receives it means the oscillator is probably working correctly. With a scope and a schematic you could do some quick and informative troubleshooting.

Perhaps when the relay connects for transmit on HF finals it's showing then... But without relay activated you can't see the short.

An update on my IC-7100 that was having the same issue. I messaged ICOM and they recommended I do a factory reset, as have some of the commentors below. I was skeptical as it sounded like old PC Support line "run cleanup and do a hard drive defrag". But I did the reset and it fixed the radio. Moreover, I have had the zero TX power problem return at least two more times - including today. The factory reset fixed it both times. Today was odd. I was playing on FT8 with WSJTX on 12M, and logged contacts to Thailand and Russia, and then it just quit transmitting any power right after the last contact. It was trying to transmit - the TX/RX light on the radio was turning red. But my external meter showed zero power going out. If anyone can explain what is going wrong to stop the TX power until reset I would love to hear it. It sounds like ICOM should do a firmware update (I do have the latest). But I won't hold my breath.

If a complete reset dosent work, there is a predriver before the PA (finals). Check it before looking at the finals

3 things that will cause it to shut down or reboot. Low voltage, Bad Cable(yes, they go bad) from head to radio body, and RF coming back up the cable

Hi Steve, Omg😢hoping it’s nothing serious. Be safe have a good weekend. By the way my first radio will be a ft- 891 due to the pricing of ICOM Radios in Australia. Ageing hoping the radio is nothing serious David. VK2AAW

All's well that ends well, tnx man!

I would have tapped on any relays, and just poked around the finals with a voltmeter, keyed and un-keyed. A RF voltmeter and schematic would be nice to have!

Full factory reset. First thing to try. No love there then probably have to go back.

I'm suspicious of the band select relays, i.e.; maybe one is hung up. Ohm meter?

I hate it when that happens, I loved my 7100, you already knew that. One is none though.

Me thinks you are looking into space when you look into that radio

So did I miss the resolution??

A few dumb checks...did you try FM on HF? Did you check that mic was not set to USB or ACC (which it can do other than data mode).

that's very unfortunate. I like having the 7100 in the truck. I hope it's nothing major.

Looks like you were keying the mike on HF, on SSB or CW that won't produce any output. Put it in FM mode an repeat.....

I have no idea, but send it to me. I'll get it fixed and keep it.👌😂

Have you tried the radio connected to a power supply other than the battery ?

I bought one of these in May and I hate it! It has piss poor output power, between 5-20 watts. And they should be embarrassed to try to sell this thing for $1200 with a display that is roughly as good as a 1990 Gameboy. Does Icom have any products released in the last 10 years?

You forgot to use one of your most important senses, that huge nose that you keep tapping

Well daggum.

Well...Radios having Feelings too. Sometimes they are moody and not feeling up to go for a Job at all. Don't laugh....

Check your PA board.

send it to TRX Lab

Nothin a little bondo and duct tape won't fix. U checked the gas right?

...turbines to speed. Roger. Ready to move out.

I think you need a new Flux capacitor

Problem is it's an icom

ok when do you tell ud what was wrong with it??? lol

So……ah…whut was wrong?

Here is a repair for a very similar issue. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nGOvEOelDTo.htmlsi=cEVdt8R7MZgwTs9t

You really have no idea what you are doing, do you?