Re: Fixing the unrepairable IC7000
If it was the two Tants, then, their main issue was going SC intermittently!!
KR
Andrew
Get
Caps were 47uF instead of the 100uf listed in the service manuals. ?Which I suspect lead to them failing or cause issues
On Mar 12, 2025, at 7:21?PM, Bob via groups.io <W4JFABob@...> wrote:
?
What do you mean by " inappropriate value capacitors"?
It’s been a while since I updated, but the repair has been a major challenge.? Finally have a major update.? The radio has been repaired without having to replace any boards.? I bought a new DDS, Logic, and Main, but by the time the new boards would come in, I would find and repair the original.? So, now I have spares.? Onto the results!
?
Not Powering on: Dreaded Click-Click was traced to Display Board having inappropriate value capacitors and burned spot next to connector on Main Board.? Replaced capacitors in Display Board and rebuilt the area around the burned spot on main board.? There was a broken/burned trace under the connector.? After this section was done, it powered up.
?
Logic board- NO AUDIO.? This was a PAIN.? Found burned inductor L551, replaced.? Still no audio.? Replaced several resistors and capacitors trying to rule out issues along the signal path, no luck.? Replaced IC551 due to a suspicious spot and was in the path of the burned inductor….still nothing.? I pulled my 7000 back out and mapped ALL the signals for the audio circuits I could with an oscilloscope and found NO CLOCK SIGNAL on the CLK circuit.? Traced back to the same connector that was affected on the main board.? R705 on Logic Board had over 10x the resistance it was supposed to.? Replaced it and she is singing again.
?
DDS board- no idea.? Seems fine for now, but I will find out when I move onto the alignment.? It said no RX/TX, but it seems like it is receiving.? If I post on this again, then I found a problem.? If not, there was no problem with the DDS unit.
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Re: Fixing the unrepairable IC7000
Caps were 47uF instead of the 100uf listed in the service manuals. ?Which I suspect lead to them failing or cause issues
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On Mar 12, 2025, at 7:21?PM, Bob via groups.io <W4JFABob@...> wrote:
? What do you mean by " inappropriate value capacitors"?It’s been a while since I updated, but the repair has been a major challenge.? Finally have a major update.? The radio has been repaired without having to replace any boards.? I bought a new DDS, Logic, and Main, but by the time the new boards would come in, I would find and repair the original.? So, now I have spares.? Onto the results!
?
Not Powering on: Dreaded Click-Click was traced to Display Board having inappropriate value capacitors and burned spot next to connector on Main Board.? Replaced capacitors in Display Board and rebuilt the area around the burned spot on main board.? There was a broken/burned trace under the connector.? After this section was done, it powered up.
?
Logic board- NO AUDIO.? This was a PAIN.? Found burned inductor L551, replaced.? Still no audio.? Replaced several resistors and capacitors trying to rule out issues along the signal path, no luck.? Replaced IC551 due to a suspicious spot and was in the path of the burned inductor….still nothing.? I pulled my 7000 back out and mapped ALL the signals for the audio circuits I could with an oscilloscope and found NO CLOCK SIGNAL on the CLK circuit.? Traced back to the same connector that was affected on the main board.? R705 on Logic Board had over 10x the resistance it was supposed to.? Replaced it and she is singing again.
?
DDS board- no idea.? Seems fine for now, but I will find out when I move onto the alignment.? It said no RX/TX, but it seems like it is receiving.? If I post on this again, then I found a problem.? If not, there was no problem with the DDS unit.
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Re: Fixing the unrepairable IC7000
What do you mean by " inappropriate value capacitors"?
It’s been a while since I updated, but the repair has been a major challenge.? Finally have a major update.? The radio has been repaired without having to replace any boards.? I bought a new DDS, Logic, and Main, but by the time the new boards would come in, I would find and repair the original.? So, now I have spares.? Onto the results!
?
Not Powering on: Dreaded Click-Click was traced to Display Board having inappropriate value capacitors and burned spot next to connector on Main Board.? Replaced capacitors in Display Board and rebuilt the area around the burned spot on main board.? There was a broken/burned trace under the connector.? After this section was done, it powered up.
?
Logic board- NO AUDIO.? This was a PAIN.? Found burned inductor L551, replaced.? Still no audio.? Replaced several resistors and capacitors trying to rule out issues along the signal path, no luck.? Replaced IC551 due to a suspicious spot and was in the path of the burned inductor….still nothing.? I pulled my 7000 back out and mapped ALL the signals for the audio circuits I could with an oscilloscope and found NO CLOCK SIGNAL on the CLK circuit.? Traced back to the same connector that was affected on the main board.? R705 on Logic Board had over 10x the resistance it was supposed to.? Replaced it and she is singing again.
?
DDS board- no idea.? Seems fine for now, but I will find out when I move onto the alignment.? It said no RX/TX, but it seems like it is receiving.? If I post on this again, then I found a problem.? If not, there was no problem with the DDS unit.
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Re: Fixing the unrepairable IC7000
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Re: Fixing the unrepairable IC7000
Hi very well done ? 73 ? Andrew ?
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From: [email protected] <[email protected]> On Behalf Of Craig- KB4RU via groups.io
Sent: 12 March 2025 17:31
To: [email protected]
Subject: Re: [ic7000] Fixing the unrepairable IC7000? It’s been a while since I updated, but the repair has been a major challenge. ?Finally have a major update. ?The radio has been repaired without having to replace any boards. ?I bought a new DDS, Logic, and Main, but by the time the new boards would come in, I would find and repair the original. ?So, now I have spares. ?Onto the results! Not Powering on: Dreaded Click-Click was traced to Display Board having inappropriate value capacitors and burned spot next to connector on Main Board. ?Replaced capacitors in Display Board and rebuilt the area around the burned spot on main board. ?There was a broken/burned trace under the connector. ?After this section was done, it powered up. Logic board- NO AUDIO. ?This was a PAIN. ?Found burned inductor L551, replaced. ?Still no audio. ?Replaced several resistors and capacitors trying to rule out issues along the signal path, no luck. ?Replaced IC551 due to a suspicious spot and was in the path of the burned inductor….still nothing. ?I pulled my 7000 back out and mapped ALL the signals for the audio circuits I could with an oscilloscope and found NO CLOCK SIGNAL on the CLK circuit. ?Traced back to the same connector that was affected on the main board. ?R705 on Logic Board had over 10x the resistance it was supposed to. ?Replaced it and she is singing again. DDS board- no idea. ?Seems fine for now, but I will find out when I move onto the alignment. ?It said no RX/TX, but it seems like it is receiving. ?If I post on this again, then I found a problem. ?If not, there was no problem with the DDS unit.
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Re: Fixing the unrepairable IC7000
It’s been a while since I updated, but the repair has been a major challenge. ?Finally have a major update. ?The radio has been repaired without having to replace any boards. ?I bought a new DDS, Logic, and Main, but by the time the new boards would come in, I would find and repair the original. ?So, now I have spares. ?Onto the results!
?
Not Powering on: Dreaded Click-Click was traced to Display Board having inappropriate value capacitors and burned spot next to connector on Main Board. ?Replaced capacitors in Display Board and rebuilt the area around the burned spot on main board. ?There was a broken/burned trace under the connector. ?After this section was done, it powered up.
?
Logic board- NO AUDIO. ?This was a PAIN. ?Found burned inductor L551, replaced. ?Still no audio. ?Replaced several resistors and capacitors trying to rule out issues along the signal path, no luck. ?Replaced IC551 due to a suspicious spot and was in the path of the burned inductor….still nothing. ?I pulled my 7000 back out and mapped ALL the signals for the audio circuits I could with an oscilloscope and found NO CLOCK SIGNAL on the CLK circuit. ?Traced back to the same connector that was affected on the main board. ?R705 on Logic Board had over 10x the resistance it was supposed to. ?Replaced it and she is singing again.
?
DDS board- no idea. ?Seems fine for now, but I will find out when I move onto the alignment. ?It said no RX/TX, but it seems like it is receiving. ?If I post on this again, then I found a problem. ?If not, there was no problem with the DDS unit.
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Re: Fixing the unrepairable IC7000
Take the spring out of a ball point pen, then through the pen away
KR
Andrew
Get
In case anyone loses the springs for their display unit or they lose their kick, you can buy springs on Amazon that fit perfectly and excellent strength.
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Amazon link:
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Re: Fixing the unrepairable IC7000
In case anyone loses the springs for their display unit or they lose their kick, you can buy springs on Amazon that fit perfectly and excellent strength.
?
Amazon link:
?
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Re: Fixing the unrepairable IC7000
I remember the other question I was going to look up before I answered. ?Where are the “components to check 4R7” that you were referencing? ?That confused me and I went to look at the manual to see what that might be in reference to, before I started speculating or guessing. ?Wasn’t sure if you’re referencing a 47ohm resistor somewhere or a specific part at a location. ?
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Re: Fixing the unrepairable IC7000
Sorry I wasn’t ignoring you. ?I’ve had a lot going on between the radio and home. ?I lost the springs for the display retention clip and was waiting for replacements to come in before I pulled the display back apart for pictures. ?I couldn’t think of a good way of explaining it without a visual. ?Springs were supposed to be delivered by the 13th, then delayed to the 18th, and I still haven’t received them. I also got side tracked and forgot to get back to you, so again I apologize. ?I remembered while typing this, I was also trying to reply with the schematics and part numbers in front of me to reference, but I was at work. ?Capacitors in question are C501 and C502. ?I replaced them with Digikey P/N 478-8242-1-ND. ?The 20V capacitors I tried to use but were too thick for my liking were 718-1970-1-ND.
?
The 2 capacitors in the white circle according to the service manual are supposed to be 100uf 16v tantalum capacitors. ?These are prone to failure and cause what it know as the dreaded “click-click” problem where you hear the relay click on and off, but radio never powers on. ?
The display unit that failed on the 2 radios I’m working on, had previously been worked on and had 2x 47uf 16v capacitors which failed. ?I wanted to replace them with 100uf 25v capcitors with hopes that the higher voltage rating would prevent them from failing again. ?However the 25v capacitor were slightly thicker than the original 16v and even though the panel went back together fine, you could feel a noticeable bump over the capacitors. ?I didn’t like the bulge from the extra pressure so I swapped back to the 16v rated capacitors.
?
hopefully this helps you a little bit. ?It’s been one thing after another on this radio. ?Turns out logic board has an audio problem. ?I’m thinking it’s an IC (IC601), but have not had a chance to chase signals simply because it does not power on now due to a ribbon cable getting damaged. ? New ribbon cables on order. ?I suspected the audio problem was the amplifier circuit and when I checked it over, it looked fine and when I tested the logic board in my 7000, audio went out and I was able to isolate the problem to the Logic unit. ?When I went to put the main board back in the 7000, I was frustrated with some issues at home and got careless with a ribbon cable and one of the wires got pinch and a few of the traces came off. ?
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Re: Fixing the unrepairable IC7000
Thanks for the non-reply of my email below.
No one can answer those questions since 2/10.
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-----Original Message----- From: [email protected] < [email protected]> On Behalf Of W1JCW via groups.io Sent: Monday, February 10, 2025 8:22 PM To: [email protected]Subject: [ic7000] Fixing the unrepairable IC7000 This email thread has great timing. Have 3 of these awesome rigs and a previous one lost the cap. Sent it to a friend hamrepair.com in SA Texas. Just have that failure again, now I'm inspired to fix it myself. The components to check are 4R7 and you lost me with 20v caps? Where do they go? I'm going to take pics of this for this group when I go through this. 73- W1JCW John -----Original Message----- From: [email protected] < [email protected]> On Behalf Of Andrew Lenton Sent: Sunday, February 9, 2025 4:28 AM To: [email protected]Subject: Re: [ic7000] Fixing the unrepairable IC7000 Hi, When the two 12v tants are nearly all SC after 20 years, if one holds the power on button in for too long this takes the 4R7 resistor on the underside of the logic power supply board. The resistor is 5125 1 Watt device. I have had over 10 units with this fault some 20v caps will fit 73 Andrew 73 Andrew ?Get BlueMail for Android ? On 9 Feb 2025, 04:39, at 04:39, "(( KT6LN )) via groups.io" <ke6tln@...> wrote: This is very insightful and inspiring, Craig.
Thank you for sharing your experiences.
ismail
On Sat, Feb 8, 2025, 06:09 Craig- KB4RU via groups.io <ki4coa=
[email protected]> wrote:
Hey everyone,
I am new to this group and I am in the process of repairing a few
IC-7000s. One was given to me by my grandfather and the other was my dad's
that failed and was deemed irreparable due to parts being unavailable.
Turns out my dad's IC-7000 was actually my grandfather's (KB4NZJ's). My
grandfather passed away a few years ago and his IC-7000 became a donor
radio to fix mine, but after finding out the history, I am determined to
fix it. My radio had the dreaded click-click problem no turn on problem.
My grandfather's, wouldn't turn on, I never tried it, but was listed with
Bad Main Board, Bad Logic Board, and Bad DDS Module. My desire to fix it
was originally to learn a new skill and do something nice for my dad, but
after finding out the story behind the radio, its more sentimental.
*KB4RU (IC-7000 Fix)*
My radio was repaired once before but after about a year, it failed
again. I found once I pulled apart the display unit, the Capacitors that
were supposed to be 100uf 16v were actually 47uf 25v. I was afraid this
took out parts in my radio and after tearing it apart and checking it over,
I found nothing appearing damaged. Pulled apart the other display unit and
turns out the screens were switched at some point between the radios. Put
the other screen on mine, and it came back to life. Thank god, easy fix
for the first one. Replaced the Capacitors with the correct ones and the
other display unit now works and turns the radio on. Looks like one of the
2 caps failed. FYI, Digikey lists 100uF 20v as an upgrade for the caps,
they are slightly too thick and create a bulge in the back of the display
case. Stick to the 16v.
*Onto the second radio. KB4NZJ (Silent Key) IC-7000* Display Board-
This is the older IC-7000, the display board above had the
47uf 20v Caps described above. Replaced caps and its working as it should
now.
Main Board- I thought I had a burned resistor and failed cap near the
logic board connection point. Cleaned the char off and found a burnt trace
going to the connector. I attempted to bridge the trace and the wire kept
shifting to the space between the pins. I tried to remove the connector and
make a new trace, but everything kept moving around it kept getting worse
until I ended accidently pulling up the whole trace. After several hours
trying to make something work, I gave up and ordered a new main board for
now. Eventually, I will try to cut and make a new trace to keep the
mainboard as a spare. Surface mount PCB repairs and overall radio repairs
is a new learning experience for me.
Logic board- Found a burned inductor on the back side of the logic board.
Replaced the inductor and logic board appears to be working again! I
tested it in my radio and it powered up and appeared to be working normally.
DDS- Says No RX, No TX. I have looked all over it with magnifying
glass
and have not found anything appearing damaged. I haven't poked around with
the multimeter yet, but I decided to start with the Main Board and Logic to
see if I can get it to power on, then try the DDS board. I am not sure how
it was tested to determine it was no good. May have originally come out of
my radio, but I am not sure which part came from which radio originally
anymore.
*Inspiration for others.*
Hopefully this helps someone else have some hope in restoring their
IC-7000 and keeps a few more of these wonderful radios alive. I will post
up some pictures of the projects later on. I never attempted to repair
these myself before because it was outside of my comfort zone and something
I never did before. However, I had the option of try it and see what
happens and learn something new or give up on the radio and let it sit in
the attic. Glad I did. A lot of this is easier than I expected, and I am
learning a lot as I go along. I have minimal experience fixing radios and
by no means an expert in soldering or electronics repair. My dad taught me
the basics and I learned the rest on YouTube. So, don't give up. If
you're determined enough, it can be done.
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Re: Fixing the unrepairable IC7000
Are you referencing the 2 tant caps on the display board? ?Those were the first things replaced because they were replaced before at some point with much smaller capacitors.?
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Re: Fixing the unrepairable IC7000
Ps change the two tant caps in the head they smooth the 12V rail generated by the buk converted.
As the6will fail.
73
Andrew
Get
Main board is successfully repaired! ?It powered on for the first time in years! ?No audio, so onto the DDS Board
?
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Re: Fixing the unrepairable IC7000
Does the S meter indicate with signal, is the DSP module warm as it foes run rather hot?
Get
Main board is successfully repaired! ?It powered on for the first time in years! ?No audio, so onto the DDS Board
?
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Re: Fixing the unrepairable IC7000
Main board is successfully repaired! ?It powered on for the first time in years! ?No audio, so onto the DDS Board
?
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Re: Fixing the unrepairable IC7000
As far as we know radio was working fine up until my grandfather crashed his Saturn. ?We suspect the crash cause a voltage spike that caused the failure. ?Can’t figure out any other source. ?After the crash his car was total so he gave it to my dad, but never checked between the crash or giving it to my dad if it worked.
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Re: Fixing the unrepairable IC7000
Oops Sorry Andrew I got the name wrong.? ?? Pat
On Mon, Feb 17, 2025 at 10:20?AM Pat Goodyear < ne6pg1@...> wrote: Nice job, Craig.? It sure helps having a microscope and rework station.? ? As I passed on before, Techni-tool has traces and eyelets to repair boards.? This is what I did for 35 years in the Navy and a commercial power plant. I&C tech after Navy ET.? ? ?
Pat ne6pg
Hi Do you know what caused the fault in the first place? ? KR ? Andrew ? ? First pic- post repair (almost completed).? Replaced the 2x Ferrite Beads, Resistor, Capacitor, and 2x inductors.? White spot over the resistor to the left is glare over the flux.? I still need to finish soldering the bottom right of the connector, but it got late and i needed to swap tips on the soldering iron.? Hoping to finish and test tonight after work.
 2nd pic is before i put the connector and rest of the components on.? The gold trace over the ferrite bead is the trace that burned.? It is an extremely short trace making the repair on it a PAIN!? Took me hours to get the trace to stay in place and fit in halfway decently.? I ended up using high heat transfer tape to secure it in place until I had the ferrite bead in place.? The other missing trace has also been replaced, but I don’t think I captured a picture of it.? I ended up having to use a fine tip soldering iron instead of the hot air rework station because the hot air melted the solder along the entire trace causing it to jump to the next pin or fly off the board.? I’m soldering that pin last in hopes the connector will hold it in place.? I have green solder mask to paint over the areas where it went thin from cleaning as well. ? Hoping to test tonight and see if this comes back to life.
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Re: Fixing the unrepairable IC7000
Nice job, Craig.? It sure helps having a microscope and rework station.? ? As I passed on before, Techni-tool has traces and eyelets to repair boards.? This is what I did for 35 years in the Navy and a commercial power plant. I&C tech after Navy ET.? ? ?
Pat ne6pg
Hi Do you know what caused the fault in the first place? ? KR ? Andrew ? ? First pic- post repair (almost completed).? Replaced the 2x Ferrite Beads, Resistor, Capacitor, and 2x inductors.? White spot over the resistor to the left is glare over the flux.? I still need to finish soldering the bottom right of the connector, but it got late and i needed to swap tips on the soldering iron.? Hoping to finish and test tonight after work.
 2nd pic is before i put the connector and rest of the components on.? The gold trace over the ferrite bead is the trace that burned.? It is an extremely short trace making the repair on it a PAIN!? Took me hours to get the trace to stay in place and fit in halfway decently.? I ended up using high heat transfer tape to secure it in place until I had the ferrite bead in place.? The other missing trace has also been replaced, but I don’t think I captured a picture of it.? I ended up having to use a fine tip soldering iron instead of the hot air rework station because the hot air melted the solder along the entire trace causing it to jump to the next pin or fly off the board.? I’m soldering that pin last in hopes the connector will hold it in place.? I have green solder mask to paint over the areas where it went thin from cleaning as well. ? Hoping to test tonight and see if this comes back to life.
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Re: Fixing the unrepairable IC7000
Hi Do you know what caused the fault in the first place? ? KR ? Andrew ?
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From: [email protected] <[email protected]> On Behalf Of Craig- KB4RU via groups.io
Sent: 17 February 2025 16:37
To: [email protected]
Subject: Re: [ic7000] Fixing the unrepairable IC7000? First pic- post repair (almost completed). ?Replaced the 2x Ferrite Beads, Resistor, Capacitor, and 2x inductors. ?White spot over the resistor to the left is glare over the flux. ?I still need to finish soldering the bottom right of the connector, but it got late and i needed to swap tips on the soldering iron. ?Hoping to finish and test tonight after work.
 2nd pic is before i put the connector and rest of the components on. ?The gold trace over the ferrite bead is the trace that burned. ?It is an extremely short trace making the repair on it a PAIN! ?Took me hours to get the trace to stay in place and fit in halfway decently. ?I ended up using high heat transfer tape to secure it in place until I had the ferrite bead in place. ?The other missing trace has also been replaced, but I don’t think I captured a picture of it. ?I ended up having to use a fine tip soldering iron instead of the hot air rework station because the hot air melted the solder along the entire trace causing it to jump to the next pin or fly off the board. ?I’m soldering that pin last in hopes the connector will hold it in place. ?I have green solder mask to paint over the areas where it went thin from cleaning as well. ? Hoping to test tonight and see if this comes back to life.
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Re: Fixing the unrepairable IC7000
First pic- post repair (almost completed). ?Replaced the 2x Ferrite Beads, Resistor, Capacitor, and 2x inductors. ?White spot over the resistor to the left is glare over the flux. ?I still need to finish soldering the bottom right of the connector, but it got late and i needed to swap tips on the soldering iron. ?Hoping to finish and test tonight after work.  ?
2nd pic is before i put the connector and rest of the components on. ?The gold trace over the ferrite bead is the trace that burned. ?It is an extremely short trace making the repair on it a PAIN! ?Took me hours to get the trace to stay in place and fit in halfway decently. ?I ended up using high heat transfer tape to secure it in place until I had the ferrite bead in place. ?The other missing trace has also been replaced, but I don’t think I captured a picture of it. ?I ended up having to use a fine tip soldering iron instead of the hot air rework station because the hot air melted the solder along the entire trace causing it to jump to the next pin or fly off the board. ?I’m soldering that pin last in hopes the connector will hold it in place. ?I have green solder mask to paint over the areas where it went thin from cleaning as well. ?
?
Hoping to test tonight and see if this comes back to life.
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Andrew Lenton
Bob
Pat Goodyear