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. ?
|
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.
|
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.?
|
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
?
|
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.
|
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.
|
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.
|
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.
|
Re: Fixing the unrepairable IC7000
First pic- top view of the logic board. ?Problem was the burned inductor. ?Replaced the inductor and Logic Board appears functional again.  ?
Burnt section on Main Board. ?Components actually seemed to check out ok and the actual source of the burn was a trace under the connector. ?I don’t think I captured a picture of the actual trace unfortunately. ?I did get an electronic microscope yesterday to better capture the images of the damage/repairs. ?Made scouting the board and performing the repairs MUCH easier. ?Highly recommend one.
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Re: IC7000 no HF Transmit
Hi Tommy, ? I suspect the track overheated by someone tuning while at full power and running a hight SWR. I presume you do have full power control and can turn it down? ? KR ? Andrew ?
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From: [email protected] <[email protected]> On Behalf Of Tommy Wooten via groups.io
Sent: 13 February 2025 01:26
To: [email protected]
Subject: Re: [ic7000] IC7000 no HF Transmit? 
GREAT NEWS!!!? I found the problem and resolved it. The problem was an open circuit on one side of L305 output transformer.? The open circuit was caused by a manufacturing flaw (quality control). I removed L305 to inspect it and possibly replace if necessary.? I have attached a photo of the issue.? There is missing board trace material on one of the input legs as compared to the other leg. To repair this, I soldered a small piece of copper foil in this area.? I then reinstalled the transformer, reset the bias currents.? Voila!!!? Tx is now working. ?100W out as designed, power meter, ALC and SWR meter are working.? Fantastic.? I also made a 59 contact on 20 meters. This is a very strange find.? I don't know much about the history of this radio, but how could this radio have ever?worked?? To me this is a blatant quality control issue at ICOM.? Oh well, I now have a working IC7000 at a great price. I want to thank all those who pushed me to track down the issue.? Especially Andrew who suggested replacing L305 in the beginning. Thank you, thank you, thank you ? ? I appreciate all the instructions and advice from Andrew, JD and James. ? It has been a few days since I last did any testing. ? So far, I have found nothing that is causing the output power to be so low. ? I did go back and check the DRIVER/FINAL IDLING CURRENT as defined in section 4-4 of the service manual.? The idle current is set to 2.5A for the driver and HF-1 and HF-2.? Then I checked the voltage at the base of each PA transistor.? I observed the following: What can cause these to be different? ? I do see that the output signal at each drain is not a clean sign wave. ?(See attached). Then, the combined signal at the output of transformer L305 seems to show two out of phase signals. ? I have done a little more troubleshooting around the LPF final filter section.? I unplugged the cable from the main board to the PA.? I set the freq to 14.2 MHz.? I separated the output of L305 transformer and injected a 14.2 signal into C327 and looked at ant1 with a scope.? When I pushed tx the signal is seen at a reduced level at ant1.? I also saw the signal reduce at the input when tx is activated.? The signal level was 7 volts and is reduced to 3.5 volts when tx is activated. I also saw 0 ohm resistance of the tx path of the RL801 at tx.? I also saw 0 ohms resistance inward side of C327 and C972 at tx. I just chose 14.2 but all the filter paths are similar. Please provide comments and suggestions. 20% high does not sound too bad!!
It is when they drop low and you lose 90% will be the issue.
73
Andrew
?Get BlueMail for Android ?
On 30 Jan 2025, 20:28, at 20:28, "Tommy Wooten via " <kf4rwg=[email protected]> wrote:
>JD
>I think Andrew suggested that capacitors may be the issue.? There are
>two
>large smt capacitors in the filter section after the PA section.? I
>removed
>these and measured them.? The result is as follows:
>C327 = 942 nF
>C972 = 811 nF
>
>These are rated at 680 nF and measure 20 to 30% high in value.
>
>I will check other caps in the path before the driver.
>
>Any thoughts?
>
>Tommy
>
>
>
>
>On Wed, Jan 29, 2025 at 1:02?PM J.D. Barron via
><jeter.d.barron=
>[email protected]> wrote:
>
>> RL801 may not be making good contact. You can check the levels with
>your
>> scope. I would use SSB and whistle in the Mike for tracing to keep
>the
>> power dissipation low.
>>
>> On Wed, Jan 29, 2025, 11:51?AM J.D. Barron via
><jeter.d.barron=
>> [email protected]> wrote:
>>
>>> Take a good look at RL801
>>>
>>> On Wed, Jan 29, 2025, 11:06?AM Tommy Wooten via <kf4rwg=
>>> [email protected]> wrote:
>>>
>> JD
>>>>
>>>> I was able to access each of the relay leads from the top side of
>the PA
>>>> board.? I found that each relay had the 14VR supplied at the relay
>coil.
>>>> The voltage is 10.5V and falls to 9.2V when tx is activated.? I
>verified
>>>> that L1 thru L7 leads were 10.5V and dropped to 130mV (gnd) when
>activated
>>>> by the appropriate band selection.? PHT8 at RL801 acted same when
>tx is
>>>> activated.
>>>> All gnd readings were 130mV except RL941 read 363mV as an
>observation.
>>>> All relays seem to click appropriately when each band was selected.
>>>> I cannot access IC981 since it is on the bottom side of PA.? But
>from
>>>> the info above it indicates it is working correctly.
>>>>
>>>> This does not explain why I was able to see 6W at the output of
>L305 but
>>>> I see negligible power when it passes through the filters.? There
>must be a
>>>> short or open in path.
>>>>
>>>> No smoking gun yet!
>>>>
>>>> I won’t stop until I find the issue or tear something up.
>>>>
>>>> Thanks
>>>> Tommy
>>>>
>>>> On Tue, Jan 28, 2025 at 5:45?PM J.D. Barron via
>>>> <jeter.d.barron=[email protected]> wrote:
>>>>
>>>>>
>>>>> (PA 1) The RF comes from L305? through HF03 to RL-801 (PA 2)
>(changes
>>>>> from orange to blue and out through (A). to
>>>>> (PA 3) the bandpass filters. There are a pair of relays that have
>to be
>>>>> energized for each frequency band. The input relays are controlled
>by L1 -
>>>>> L7 (Bus line 3) from the (PA 3) Q980 - Q987 by the outputs from
>IC981.
>>>>> (Powered by 3R3V)
>>>>>
>>>>> 14 VR provides the operating voltage for these relays and the
>output
>>>>> relays. (At this point I have to say I have not looked long enough
>and hard
>>>>> enough to understand how the output relays are activated but they
>must be.)
>>>>> as each band is selected by L1 - L7 going low.
>>>>> VR14 comes from RL701 output through L981 and resistors R1002 (150
>ohm)
>>>>> and 1003 (180 ohm) (paralleled). This line also provides power to
>RL801
>>>>> which would also stop the RF power from getting to the bandpass
>filters
>>>>> HF03 (Orange) to A (Blue). If R1002 and R1003 were open this would
>cause
>>>>> this problem as well. One of the anti-flyback diodes shorted could
>take out
>>>>> these resistors
>>>>>
>>>>> I think that as each L1 - L7 goes low that low is transferred via
>the
>>>>> blue line to the normally closed contact on the relay below to
>ground on
>>>>> the unenergized relay (I think).
>>>>>
>>>>> I would verify that the VR14 voltage is present first and then -
>if
>>>>> present
>>>>>
>>>>> I would look for the L1 - L7 signals being pulled low by Q980 -
>Q987.
>>>>> end then If switching I would look to
>>>>> The outputs on IC981.
>>>>>
>>>>> I believe you will find the problem in this area as you are
>drawing
>>>>> current indicating power being produced (unless the current is not
>in the
>>>>> 1-3 Amp range in SSB no modulation idling current).
>>>>>
>>>>> Since the power is not going through L961 the FOR / REV (SWR)
>>>>> transformer and being read by IC060 (JFOR) the RF drive is going
>to the
>>>>> point of current limit and cannot be adjusted in any carrier mode
>with the
>>>>> power adjustment.
>>>>>
>>>>> Just my best guess without making some measurements, but this is
>where
>>>>> I would start.
>>>>>
>>>>> Good luck and best regards.
>>>>>
>>>>>? JD
>>>>> KE4MD
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>
>>
>
>
>
|
Nice work Tommy!
?
It’s so gratifying to fix this stuff even after all these years.
?
My wife still asks why I don’t send the radio off for repair, I do know a guy close by that services these. I explained again, that fixing anything yourself
is the reward.
Give it the old college try!
?
73-
W1JCW
John
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Tommy Wooten via groups.io
Sent: Wednesday, February 12, 2025 7:26 PM
To: [email protected]
Subject: Re: [ic7000] IC7000 no HF Transmit
?
GREAT NEWS!!!? I found the problem and resolved it.
The problem was an open circuit on one side of L305 output transformer.? The open circuit was caused by a manufacturing flaw (quality control).
I removed L305 to inspect it and possibly replace if necessary.? I have attached a photo of the issue.? There is missing board trace material on one of the input legs as compared to the other leg.
To repair this, I soldered a small piece of copper foil in this area.? I then reinstalled the transformer, reset the bias currents.? Voila!!!? Tx is now working. ?100W out as designed, power meter, ALC and SWR meter are working.? Fantastic.?
I also made a 59 contact on 20 meters.
This is a very strange find.? I don't know much about the history of this radio, but how could this radio have ever?worked?? To me this is a blatant quality control issue at ICOM.? Oh well, I now have a working IC7000 at a great price.
I want to thank all those who pushed me to track down the issue.? Especially Andrew who suggested replacing L305 in the beginning.
Thank you, thank you, thank you
?
?
I appreciate all the instructions and advice from Andrew, JD and James. ?
It has been a few days since I last did any testing. ? So far, I have found nothing that is causing the output power to be so low. ?
I did go back and check the DRIVER/FINAL IDLING CURRENT as defined in section 4-4 of the service manual.? The idle current is set to 2.5A for the driver and HF-1 and HF-2.? Then I checked the voltage at the base of each PA transistor.?
I observed the following:
What can cause these to be different? ?
I do see that the output signal at each drain is not a clean sign wave. ?(See attached). Then, the combined signal at the output of transformer L305 seems to show two out of phase signals.
?
I have done a little more troubleshooting around the LPF final filter section.? I unplugged the cable from the main board to the PA.? I set the freq to 14.2 MHz.? I separated the output of L305 transformer and injected a 14.2 signal into
C327 and looked at ant1 with a scope.? When I pushed tx the signal is seen at a reduced level at ant1.? I also saw the signal reduce at the input when tx is activated.? The signal level was 7 volts and is reduced to 3.5 volts when tx is activated.
I also saw 0 ohm resistance of the tx path of the RL801 at tx.? I also saw 0 ohms resistance inward side of C327 and C972 at tx.
I just chose 14.2 but all the filter paths are similar.
Please provide comments and suggestions.
20% high does not sound too bad!!
It is when they drop low and you lose 90% will be the issue.
73
Andrew
?Get BlueMail for Android
?
On 30 Jan 2025, 20:28, at 20:28, "Tommy Wooten via " <kf4rwg=[email protected]> wrote:
>JD
>I think Andrew suggested that capacitors may be the issue.? There are
>two
>large smt capacitors in the filter section after the PA section.? I
>removed
>these and measured them.? The result is as follows:
>C327 = 942 nF
>C972 = 811 nF
>
>These are rated at 680 nF and measure 20 to 30% high in value.
>
>I will check other caps in the path before the driver.
>
>Any thoughts?
>
>Tommy
>
>
>
>
>On Wed, Jan 29, 2025 at 1:02?PM J.D. Barron via
><jeter.d.barron=
>[email protected]> wrote:
>
>> RL801 may not be making good contact. You can check the levels with
>your
>> scope. I would use SSB and whistle in the Mike for tracing to keep
>the
>> power dissipation low.
>>
>> On Wed, Jan 29, 2025, 11:51?AM J.D. Barron via
><jeter.d.barron=
>> [email protected]> wrote:
>>
>>> Take a good look at RL801
>>>
>>> On Wed, Jan 29, 2025, 11:06?AM Tommy Wooten via
<kf4rwg=
>>> [email protected]> wrote:
>>>
>> JD
>>>>
>>>> I was able to access each of the relay leads from the top side of
>the PA
>>>> board.? I found that each relay had the 14VR supplied at the relay
>coil.
>>>> The voltage is 10.5V and falls to 9.2V when tx is activated.? I
>verified
>>>> that L1 thru L7 leads were 10.5V and dropped to 130mV (gnd) when
>activated
>>>> by the appropriate band selection.? PHT8 at RL801 acted same when
>tx is
>>>> activated.
>>>> All gnd readings were 130mV except RL941 read 363mV as an
>observation.
>>>> All relays seem to click appropriately when each band was selected.
>>>> I cannot access IC981 since it is on the bottom side of PA.? But
>from
>>>> the info above it indicates it is working correctly.
>>>>
>>>> This does not explain why I was able to see 6W at the output of
>L305 but
>>>> I see negligible power when it passes through the filters.? There
>must be a
>>>> short or open in path.
>>>>
>>>> No smoking gun yet!
>>>>
>>>> I won’t stop until I find the issue or tear something up.
>>>>
>>>> Thanks
>>>> Tommy
>>>>
>>>> On Tue, Jan 28, 2025 at 5:45?PM J.D. Barron via
>>>> <jeter.d.barron=[email protected]> wrote:
>>>>
>>>>>
>>>>> (PA 1) The RF comes from L305? through HF03 to RL-801 (PA 2)
>(changes
>>>>> from orange to blue and out through (A). to
>>>>> (PA 3) the bandpass filters. There are a pair of relays that have
>to be
>>>>> energized for each frequency band. The input relays are controlled
>by L1 -
>>>>> L7 (Bus line 3) from the (PA 3) Q980 - Q987 by the outputs from
>IC981.
>>>>> (Powered by 3R3V)
>>>>>
>>>>> 14 VR provides the operating voltage for these relays and the
>output
>>>>> relays. (At this point I have to say I have not looked long enough
>and hard
>>>>> enough to understand how the output relays are activated but they
>must be.)
>>>>> as each band is selected by L1 - L7 going low.
>>>>> VR14 comes from RL701 output through L981 and resistors R1002 (150
>ohm)
>>>>> and 1003 (180 ohm) (paralleled). This line also provides power to
>RL801
>>>>> which would also stop the RF power from getting to the bandpass
>filters
>>>>> HF03 (Orange) to A (Blue). If R1002 and R1003 were open this would
>cause
>>>>> this problem as well. One of the anti-flyback diodes shorted could
>take out
>>>>> these resistors
>>>>>
>>>>> I think that as each L1 - L7 goes low that low is transferred via
>the
>>>>> blue line to the normally closed contact on the relay below to
>ground on
>>>>> the unenergized relay (I think).
>>>>>
>>>>> I would verify that the VR14 voltage is present first and then -
>if
>>>>> present
>>>>>
>>>>> I would look for the L1 - L7 signals being pulled low by Q980 -
>Q987.
>>>>> end then If switching I would look to
>>>>> The outputs on IC981.
>>>>>
>>>>> I believe you will find the problem in this area as you are
>drawing
>>>>> current indicating power being produced (unless the current is not
>in the
>>>>> 1-3 Amp range in SSB no modulation idling current).
>>>>>
>>>>> Since the power is not going through L961 the FOR / REV (SWR)
>>>>> transformer and being read by IC060 (JFOR) the RF drive is going
>to the
>>>>> point of current limit and cannot be adjusted in any carrier mode
>with the
>>>>> power adjustment.
>>>>>
>>>>> Just my best guess without making some measurements, but this is
>where
>>>>> I would start.
>>>>>
>>>>> Good luck and best regards.
>>>>>
>>>>>? JD
>>>>> KE4MD
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>
>>
>
>
>
|
Re: IC7000 no HF Transmit
 GREAT NEWS!!!? I found the problem and resolved it.
The problem was an open circuit on one side of L305 output transformer.? The open circuit was caused by a manufacturing flaw (quality control). I removed L305 to inspect it and possibly replace if necessary.? I have attached a photo of the issue.? There is missing board trace material on one of the input legs as compared to the other leg.
To repair this, I soldered a small piece of copper foil in this area.? I then reinstalled the transformer, reset the bias currents.? Voila!!!? Tx is now working. ?100W out as designed, power meter, ALC and SWR meter are working.? Fantastic.? I also made a 59 contact on 20 meters.
This is a very strange find.? I don't know much about the history of this radio, but how could this radio have ever?worked?? To me this is a blatant quality control issue at ICOM.? Oh well, I now have a working IC7000 at a great price.
I want to thank all those who pushed me to track down the issue.? Especially Andrew who suggested replacing L305 in the beginning.
Thank you, thank you, thank you
Tommy KF4RWG
I appreciate all the instructions and advice from Andrew, JD and James. ?
It has been a few days since I last did any testing. ? So far, I have found nothing that is causing the output power to be so low. ?
I did go back and check the DRIVER/FINAL IDLING CURRENT as defined in section 4-4 of the service manual.? The idle current is set to 2.5A for the driver and HF-1 and HF-2.? Then I checked the voltage at the base of each PA transistor.? I observed the following:
Q301 = 4.3V Q302 = 2.4 V
What can cause these to be different? ? I do see that the output signal at each drain is not a clean sign wave. ?(See attached). Then, the combined signal at the output of transformer L305 seems to show two out of phase signals.
Any suggestions?
Thanks again Tommy KF4RWG I have done a little more troubleshooting around the LPF final filter section.? I unplugged the cable from the main board to the PA.? I set the freq to 14.2 MHz.? I separated the output of L305 transformer and injected a 14.2 signal into C327 and looked at ant1 with a scope.? When I pushed tx the signal is seen at a reduced level at ant1.? I also saw the signal reduce at the input when tx is activated.? The signal level was 7 volts and is reduced to 3.5 volts when tx is activated.
I also saw 0 ohm resistance of the tx path of the RL801 at tx.? I also saw 0 ohms resistance inward side of C327 and C972 at tx.
I just chose 14.2 but all the filter paths are similar.
Please provide comments and suggestions.
Thanks Tommy
20% high does not sound too bad!!
It is when they drop low and you lose 90% will be the issue.
73
Andrew
?Get BlueMail for Android ?
On 30 Jan 2025, 20:28, at 20:28, "Tommy Wooten via " <kf4rwg=[email protected]> wrote:
>JD
>I think Andrew suggested that capacitors may be the issue.? There are
>two
>large smt capacitors in the filter section after the PA section.? I
>removed
>these and measured them.? The result is as follows:
>C327 = 942 nF
>C972 = 811 nF
>
>These are rated at 680 nF and measure 20 to 30% high in value.
>
>I will check other caps in the path before the driver.
>
>Any thoughts?
>
>Tommy
>
>
>
>
>On Wed, Jan 29, 2025 at 1:02?PM J.D. Barron via
><jeter.d.barron=
>[email protected]> wrote:
>
>> RL801 may not be making good contact. You can check the levels with
>your
>> scope. I would use SSB and whistle in the Mike for tracing to keep
>the
>> power dissipation low.
>>
>> On Wed, Jan 29, 2025, 11:51?AM J.D. Barron via
><jeter.d.barron=
>> [email protected]> wrote:
>>
>>> Take a good look at RL801
>>>
>>> On Wed, Jan 29, 2025, 11:06?AM Tommy Wooten via <kf4rwg=
>>> [email protected]> wrote:
>>>
>> JD
>>>>
>>>> I was able to access each of the relay leads from the top side of
>the PA
>>>> board.? I found that each relay had the 14VR supplied at the relay
>coil.
>>>> The voltage is 10.5V and falls to 9.2V when tx is activated.? I
>verified
>>>> that L1 thru L7 leads were 10.5V and dropped to 130mV (gnd) when
>activated
>>>> by the appropriate band selection.? PHT8 at RL801 acted same when
>tx is
>>>> activated.
>>>> All gnd readings were 130mV except RL941 read 363mV as an
>observation.
>>>> All relays seem to click appropriately when each band was selected.
>>>> I cannot access IC981 since it is on the bottom side of PA.? But
>from
>>>> the info above it indicates it is working correctly.
>>>>
>>>> This does not explain why I was able to see 6W at the output of
>L305 but
>>>> I see negligible power when it passes through the filters.? There
>must be a
>>>> short or open in path.
>>>>
>>>> No smoking gun yet!
>>>>
>>>> I won’t stop until I find the issue or tear something up.
>>>>
>>>> Thanks
>>>> Tommy
>>>>
>>>> On Tue, Jan 28, 2025 at 5:45?PM J.D. Barron via
>>>> <jeter.d.barron=[email protected]> wrote:
>>>>
>>>>>
>>>>> (PA 1) The RF comes from L305? through HF03 to RL-801 (PA 2)
>(changes
>>>>> from orange to blue and out through (A). to
>>>>> (PA 3) the bandpass filters. There are a pair of relays that have
>to be
>>>>> energized for each frequency band. The input relays are controlled
>by L1 -
>>>>> L7 (Bus line 3) from the (PA 3) Q980 - Q987 by the outputs from
>IC981.
>>>>> (Powered by 3R3V)
>>>>>
>>>>> 14 VR provides the operating voltage for these relays and the
>output
>>>>> relays. (At this point I have to say I have not looked long enough
>and hard
>>>>> enough to understand how the output relays are activated but they
>must be.)
>>>>> as each band is selected by L1 - L7 going low.
>>>>> VR14 comes from RL701 output through L981 and resistors R1002 (150
>ohm)
>>>>> and 1003 (180 ohm) (paralleled). This line also provides power to
>RL801
>>>>> which would also stop the RF power from getting to the bandpass
>filters
>>>>> HF03 (Orange) to A (Blue). If R1002 and R1003 were open this would
>cause
>>>>> this problem as well. One of the anti-flyback diodes shorted could
>take out
>>>>> these resistors
>>>>>
>>>>> I think that as each L1 - L7 goes low that low is transferred via
>the
>>>>> blue line to the normally closed contact on the relay below to
>ground on
>>>>> the unenergized relay (I think).
>>>>>
>>>>> I would verify that the VR14 voltage is present first and then -
>if
>>>>> present
>>>>>
>>>>> I would look for the L1 - L7 signals being pulled low by Q980 -
>Q987.
>>>>> end then If switching I would look to
>>>>> The outputs on IC981.
>>>>>
>>>>> I believe you will find the problem in this area as you are
>drawing
>>>>> current indicating power being produced (unless the current is not
>in the
>>>>> 1-3 Amp range in SSB no modulation idling current).
>>>>>
>>>>> Since the power is not going through L961 the FOR / REV (SWR)
>>>>> transformer and being read by IC060 (JFOR) the RF drive is going
>to the
>>>>> point of current limit and cannot be adjusted in any carrier mode
>with the
>>>>> power adjustment.
>>>>>
>>>>> Just my best guess without making some measurements, but this is
>where
>>>>> I would start.
>>>>>
>>>>> Good luck and best regards.
>>>>>
>>>>>? JD
>>>>> KE4MD
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>
>>
>
>
>
|
Re: Fixing the unrepairable IC7000
So the change in components and not the schematics is very common.? ?I had two Icom 706 MkII G's, one a low serial number and one a later version, the early one used Motorola finals on the PA board.? The later used National Semi finals on the PA, the two were not swappable as they used different bias voltages and lead configurations.? ?There is a document? that was done by a tech in Spain that shows what needs to be done in order to use the later chips on the earlier board.? ?Involves moving traces and grinding the PA board.??
I also have a couple of Icom W32 handhelds?that have different components and boards, such that the newer one cannot? be configured to receive?in the upper UHF band.? ?
Pat NE6PG
|
Re: Fixing the unrepairable IC7000
Craig, From what you observed, it does sound like they were replaced. I've run across this with stereo gear. It's usually recommended by experienced techs to replace with what was there if it was working properly. It is definitely confusing though. Bob W4JFA
Fair point Bob about the making a change from the manufacturer.? The 2 capacitors i mentioned were a different brand than the others of the same rating and the solder joints didn’t look the same as the others in the display board, so to me, it looks highly suspicious that they have been replaced before. ?
Unfortunately, I know very little about the history of this radio except it was purchased in 2011 from HRO and it died after the car it was in, was in an accident.? My dad was gifted it from my grandfather, not knowing it died, and when my dad couldn’t get it to work, he shipped it off for repair and received it back being told it couldn’t be repaired.? ? Every once in a while if you find a part that doesn't match the schematic, such as you found a 47uF where you? expected a 100uF, doesn't always mean?someone installed the wrong part. Sometimes the manufacturer?will make a change and it doesn't make all the schematics already out in circulation. Sometimes it's just a plain error so when you find something like this, look into it further and don't assume. Bob W4JFA On Tue, Feb 11, 2025 at 10:39?AM Mark Brueggemann K5LXP via <qrq_cw= [email protected]> wrote: On Saturday, February 8, 2025 at 07:09:27 AM MST, Craig- KB4RU via <ki4coa=[email protected]> wrote:
> Inspiration for others.
> Hopefully this helps someone else have some hope in restoring their IC-7000
Your story reinforces what is a very typical scenario during repairs of most anything.? Yes, sometimes thing fail in spectacular ways (lightning strike, water damage) that make a repair attempt futile but in most cases the issue is confined to a specific part or functional assembly.? In a past life I was a commercial radio bench tech and fixed thousands of radios, most of that was isolating the fault to a given part, replace it, and off it goes again.? Odds of fixing it are in your favor, *if you try*.? Hams get freaked out over surface mount and yeah, sometimes getting in there to poke at a test point with a scope can be a challenge, but there's nothing magic about it.? Take your time, be methodical and odds are you'll find something obvious.? You'll never find it if you never try.
Mark K5LXP
Albuquerque, NM
|
Re: Fixing the unrepairable IC7000
Fair point Bob about the making a change from the manufacturer. ?The 2 capacitors i mentioned were a different brand than the others of the same rating and the solder joints didn’t look the same as the others in the display board, so to me, it looks highly suspicious that they have been replaced before. ?
Unfortunately, I know very little about the history of this radio except it was purchased in 2011 from HRO and it died after the car it was in, was in an accident. ?My dad was gifted it from my grandfather, not knowing it died, and when my dad couldn’t get it to work, he shipped it off for repair and received it back being told it couldn’t be repaired.?
toggle quoted message
Show quoted text
On Feb 11, 2025, at 6:15?PM, Bob via groups.io <W4JFABob@...> wrote:
? Every once in a while if you find a part that doesn't match the schematic, such as you found a 47uF where you? expected a 100uF, doesn't always mean?someone installed the wrong part. Sometimes the manufacturer?will make a change and it doesn't make all the schematics already out in circulation. Sometimes it's just a plain error so when you find something like this, look into it further and don't assume. Bob W4JFA On Tue, Feb 11, 2025 at 10:39?AM Mark Brueggemann K5LXP via <qrq_cw= [email protected]> wrote: On Saturday, February 8, 2025 at 07:09:27 AM MST, Craig- KB4RU via <ki4coa=[email protected]> wrote:
> Inspiration for others.
> Hopefully this helps someone else have some hope in restoring their IC-7000
Your story reinforces what is a very typical scenario during repairs of most anything.? Yes, sometimes thing fail in spectacular ways (lightning strike, water damage) that make a repair attempt futile but in most cases the issue is confined to a specific part or functional assembly.? In a past life I was a commercial radio bench tech and fixed thousands of radios, most of that was isolating the fault to a given part, replace it, and off it goes again.? Odds of fixing it are in your favor, *if you try*.? Hams get freaked out over surface mount and yeah, sometimes getting in there to poke at a test point with a scope can be a challenge, but there's nothing magic about it.? Take your time, be methodical and odds are you'll find something obvious.? You'll never find it if you never try.
Mark K5LXP
Albuquerque, NM
|
Re: Fixing the unrepairable IC7000
Every once in a while if you find a part that doesn't match the schematic, such as you found a 47uF where you? expected a 100uF, doesn't always mean?someone installed the wrong part. Sometimes the manufacturer?will make a change and it doesn't make all the schematics already out in circulation. Sometimes it's just a plain error so when you find something like this, look into it further and don't assume. Bob W4JFA
On Tue, Feb 11, 2025 at 10:39?AM Mark Brueggemann K5LXP via <qrq_cw= [email protected]> wrote: On Saturday, February 8, 2025 at 07:09:27 AM MST, Craig- KB4RU via <ki4coa=[email protected]> wrote:
> Inspiration for others.
> Hopefully this helps someone else have some hope in restoring their IC-7000
Your story reinforces what is a very typical scenario during repairs of most anything.? Yes, sometimes thing fail in spectacular ways (lightning strike, water damage) that make a repair attempt futile but in most cases the issue is confined to a specific part or functional assembly.? In a past life I was a commercial radio bench tech and fixed thousands of radios, most of that was isolating the fault to a given part, replace it, and off it goes again.? Odds of fixing it are in your favor, *if you try*.? Hams get freaked out over surface mount and yeah, sometimes getting in there to poke at a test point with a scope can be a challenge, but there's nothing magic about it.? Take your time, be methodical and odds are you'll find something obvious.? You'll never find it if you never try.
Mark K5LXP
Albuquerque, NM
|
Re: Fixing the unrepairable IC7000
On Saturday, February 8, 2025 at 07:09:27 AM MST, Craig- KB4RU via groups.io <ki4coa@...> wrote: Inspiration for others. Hopefully this helps someone else have some hope in restoring their IC-7000 Your story reinforces what is a very typical scenario during repairs of most anything.? Yes, sometimes thing fail in spectacular ways (lightning strike, water damage) that make a repair attempt futile but in most cases the issue is confined to a specific part or functional assembly.? In a past life I was a commercial radio bench tech and fixed thousands of radios, most of that was isolating the fault to a given part, replace it, and off it goes again.? Odds of fixing it are in your favor, *if you try*.? Hams get freaked out over surface mount and yeah, sometimes getting in there to poke at a test point with a scope can be a challenge, but there's nothing magic about it.? Take your time, be methodical and odds are you'll find something obvious.? You'll never find it if you never try. Mark K5LXP Albuquerque, NM
|
Andrew Lenton
Pat Goodyear
Bob