Re: IC7000 no HF Transmit
If you do remove the PA board to get to L305 to remove it, can you do a ringer test on the transformer to see if it has any shorted turns? With the level of power normally passing through L305 it is a possibility. If then the results are not conclusive, maybe someone in the Group that has a PA board can test their L305 and then compare waveforms for the number of rings above the same cutoff voltage.
?
Geoff
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Re: IC7000 no HF Transmit
This is a very hard radio to work on, as you cannot easily get to the PA board the way it is mounted and soldered into the pa driver board ? I would remove the PA board, replace L305, for starters while it is out you can inspect the components one by one. ? This unit does not lend itself to test and measurements, as all you can do is prod the rear. ? All 12V HF PA stages have an impedance in the milli Ohms 0.4 to ?0.6 ohms, as it draws 20A, or so, the output transformer has to match 0.6 Ohms ?to a 50 Ohm, so it needs to step up the voltage. ? The problem is it would be nice to lift L306 and put your Watt meter in there, but you have to rip the PA board out then put it back together to make the measurement, so impractical ? To protect the PA the is a coupler to control power and to protect the PA against hi SWR, however, if no power is getting past the coupler you will have full power 24/7 ? There could be a fault here: ? 
? But only you can trace, so measure i/p to L305, you will get a voltage, the out put will be higher at 100 Watts 50 Ohm the voltage will be 70.7V RMS, so PTP on a scope 200V if you are not getting this on the O/P then move back to the I/P you should get 13.8 V ?to 40V PTP. I have one of these in bits working before I box it back together I will make some measurements and send back to you. as the PA in not loaded with 50 OHM, the voltage can rise too high 
You need to set a voltage on Ref or FOR to knock the power back to a few Watts then you can uses CW and safely trace you signal. ? 
? KR ? Andrew G8UUG ? ? ?
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-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Andrew Lenton
Sent: 26 January 2025 10:00
To: [email protected]
Subject: Re: [ic7000] IC7000 no HF Transmit ? This is a very hard radio to work on, as you can not easily get to the PA board the way it is soldered into the pa driver. ? I would remove the PA board, replace L305, for starters while it is out you can inspect the components one by one. ? This unit does not lend itself to test and measurements, as all you can do is prod the rear. ? All HF PA stages have an impedance in the mOhms .1 .2 ohms as thet6drsw 20A, the out put transformer has to match .1 of an ohm to 50, so it needs to step up the voltage. ? KR ? Andrew ? I have a wiring unit, I can make some measurements for you ? ?Get BlueMail for Android ? ? On 26 Jan 2025, 01:32, at 01:32, "Tommy Wooten via groups.io" <kf4rwg@...> wrote: >Bob, Thanks for the encouragement >? >I have considered all of the suggestions for troubleshooting the >problem I have with the IC7000.? I have tried to trace the HF RF path >with an oscilloscope from where the signal comes through the cable from >the main board to the PA board.? I have traced the signal and inspect >all components through to the output at ant1.? The signal seems to >loose its punch where the PA FETs combine into the L305 transformer.? >The bias setting of the PA FETs seem to be correct.? After the signal >reaches the rx/rx relay it passes through the selected HPF where it >reaches ant1.? The resulting signal is only a few milliwatts.? I have >tried to keep the setting in SSB and I see modulation when speaking >into the microphone. >I know it is difficult to troubleshoot the issue remotely but I >appreciate any and all ideas. >Thanks >Tommy. KF4RWG >? >? >? >On Sat, Jan 25, 2025 at 6:31?PM Bob via groups.io <W4JFABob= >[email protected]> wrote: >? >> Well this is #30 then. That's OK because when the rest of us have >this >> problem we'll appreciate every one of these replies. >> Keep on writin' you guys. >> Bob W4JFA >>? >> On Thu, Jan 23, 2025 at 4:40?PM Geoff via groups.io <vk3zgw= >> [email protected]> wrote: >>? >>> Forgive me if this has been mentioned before but as this is the 29th >>> reply I haven't gone back and read everything. >>>? >>> I always go first to where the effect of a fault is obvious without >any >>> ambiguity, in this case the rf output ie Ant 1 connector, working >back to >>> eliminate ALL the stages involved, including in this case the SO32 >jack. >>>? >>> Good luck. >>>? >>> Geoff >>> VK3ZGW >>>? >>>? >>? >>? >? >? >? ? ? ? ?
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Re: IC7000 no HF Transmit
This is a very hard radio to work on, as you can not easily get to the PA board the way it is soldered into the pa driver.
I would remove the PA board, replace L305, for starters while it is out you can inspect the components one by one.
This unit does not lend itself to test and measurements, as all you can do is prod the rear.
All HF PA stages have an impedance in the mOhms .1 .2 ohms as thet6drsw 20A, the out put transformer has to match .1 of an ohm to 50, so it needs to step up the voltage.
KR
Andrew
I have a wiring unit, I can make some measurements for you
?Get BlueMail for Android ?
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On 26 Jan 2025, 01:32, at 01:32, "Tommy Wooten via groups.io" <kf4rwg@...> wrote: Bob, Thanks for the encouragement
I have considered all of the suggestions for troubleshooting the
problem I
have with the IC7000. I have tried to trace the HF RF path with an
oscilloscope from where the signal comes through the cable from the
main
board to the PA board. I have traced the signal and inspect all
components
through to the output at ant1. The signal seems to loose its punch
where
the PA FETs combine into the L305 transformer. The bias setting of the
PA
FETs seem to be correct. After the signal reaches the rx/rx relay it
passes through the selected HPF where it reaches ant1. The resulting
signal is only a few milliwatts. I have tried to keep the setting in
SSB
and I see modulation when speaking into the microphone.
I know it is difficult to troubleshoot the issue remotely but I
appreciate
any and all ideas.
Thanks
Tommy. KF4RWG
On Sat, Jan 25, 2025 at 6:31?PM Bob via groups.io <W4JFABob=
[email protected]> wrote:
Well this is #30 then. That's OK because when the rest of us have this
problem we'll appreciate every one of these replies.
Keep on writin' you guys.
Bob W4JFA
On Thu, Jan 23, 2025 at 4:40?PM Geoff via groups.io <vk3zgw=
[email protected]> wrote:
Forgive me if this has been mentioned before but as this is the 29th
reply I haven't gone back and read everything.
I always go first to where the effect of a fault is obvious without any
ambiguity, in this case the rf output ie Ant 1 connector, working
back to
eliminate ALL the stages involved, including in this case the SO32
jack.
Good luck.
Geoff
VK3ZGW
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Re: IC7000 no HF Transmit
Tommy This is very ?interesting. It seems like you now have a list (short?) of a suspect components but I realize some might need to be removed from the circuit to fully test. Look forward to hearing more. It may come down to eliminating some components and systemically replacing the rest.
Kurt KD6LZV
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On Jan 25, 2025, at 6:16 PM, James Tiberius via groups.io <nono2212000@...> wrote:
? Hi Tommy . Have you tried to inject a signal after L305 ?
The output circuit is passive and at least you can verify losses in that part of the circuit. Or maybe little loss which means power dissipated around the finals.
James?
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Re: IC7000 no HF Transmit
Hi Tommy . Have you tried to inject a signal after L305 ?
The output circuit is passive and at least you can verify losses in that part of the circuit. Or maybe little loss which means power dissipated around the finals.
James?
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Re: IC7000 no HF Transmit
Bob, Thanks for the encouragement
I have considered all of the suggestions for troubleshooting the problem I have with the IC7000.? I have tried to trace the HF RF path with an oscilloscope from where the signal comes through the cable from the main board to the PA board.? I have traced the signal and inspect all components through to the output at ant1.? The signal seems to loose its punch where the PA FETs combine into the L305 transformer.? The bias setting of the PA FETs seem to be correct.? After the signal reaches the rx/rx relay it passes through the selected HPF where it reaches ant1.? The resulting signal is only a few milliwatts.? I have tried to keep the setting in SSB and I see modulation when speaking into the microphone. ? I know it is difficult to troubleshoot the issue remotely but I appreciate any and all ideas. Thanks Tommy. KF4RWG
Well this is #30 then. That's OK because when the rest of us have this problem we'll appreciate?every?one of?these replies. Keep on writin' you guys. Bob W4JFA
Forgive me if this has been mentioned before but as this is the 29th reply I haven't gone back and read everything.
?
I always go first to where the effect of a fault is obvious without any ambiguity, in this case the rf output ie Ant 1 connector, working back to eliminate ALL the stages involved, including in this case the SO32 jack.
?
Good luck.
?
Geoff
VK3ZGW
|
Re: IC7000 no HF Transmit
Well this is #30 then. That's OK because when the rest of us have this problem we'll appreciate?every?one of?these replies. Keep on writin' you guys. Bob W4JFA
Forgive me if this has been mentioned before but as this is the 29th reply I haven't gone back and read everything.
?
I always go first to where the effect of a fault is obvious without any ambiguity, in this case the rf output ie Ant 1 connector, working back to eliminate ALL the stages involved, including in this case the SO32 jack.
?
Good luck.
?
Geoff
VK3ZGW
|
Re: Japan version needing frequency expansion on 2m/440
Thanks for some more responses, I should have looked into it more carefully before buying the Japan version. These radio's can sometimes be scarce to buy used when looking for one and at the time, all I can find was the Japan version. My guess was that all versions were essentially built the same with the same components and the MARS mod I found online would expand "all" the frequencies. I see now this is not the case.? It's still a good radio and covers enough 2m for me and has plenty of HF range that will suit me.
?
Thanks again, Andrew K5KNM
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Re: Japan version needing frequency expansion on 2m/440
See links....
?
/g/ic7000/message/42796
--
Allison
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Re: Japan version needing frequency expansion on 2m/440
Andrew, ? I wish there was a universal way to communicate this to all: ? Domestic Japanese amateur radio units are blocked at the CPU level to only be able to transmit on Japanese amateur radio bands.? There is no way of opening the bands short of replacing the CPU. This is because of Japanese law. This is true for VHF and UHF.?? I understand that some have figured out how to open frequencies on HF, but this is unconfirmed. ? Export units have their own frequency bands depending on the country , but they can be modified for extended transmit.? That is, the EU radios have frequency restrictions somewhat similar to the domestic Japanese units, but the EU radios can be modified to operate frequencies that are available to us in Region 2 (i.e. extending 144-146 MHz to 144-148 MHz. ? My assumption on the Japanese newer units is that if new amateur radio frequencies are available in Japan, that ICOM could potentially add them by a firmware update, but this is only a guess. ? ‘73 de Jim N2ZZ ?
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From: [email protected] <[email protected]> On Behalf Of Andrew K5KNM via groups.io
Sent: Saturday, January 25, 2025 10:29 AM
To: [email protected]
Subject: [ic7000] Japan version needing frequency expansion on 2m/440? I recently purchased the Japan version of the IC-7000 for use in my my shack while my other USA version one will stay as a mobile. Of course there are some difference in frequencies between this one and the USA version. Mainly the 2m/440 bands is where the most differences are . On this model, 2m is only 144 to 146 mhz and 70cm is 430 to 440 mhz. . It appears the typical MARS mod does not expand these 2 bands to get the full US frequencies. I would like to expand these 2 bands so I'm asking here if anyone knows if this possible and what would be the procedure be. Thanks!
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Re: Japan version needing frequency expansion on 2m/440
Thanks for your reply, Yeah I was afraid that would be the case.
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Re: Japan version needing frequency expansion on 2m/440
Unfortunately almost all Japanese radios are set to conform to Japanese laws and are not modifiable to meet US US specifications.?
The Japanese "FCC" does not allow the radios modification and these can not be changed without major changing boards or major components.
This is why Icom will not work on a Japanese version of a radio nor warranty one here as parts may not be available and they were produced for that region.
Best to not buy an out of region radio for use in the US.
?
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Japan version needing frequency expansion on 2m/440
Hello all!
I recently purchased the Japan version of the IC-7000 for use in my my shack while my other USA version one will stay as a mobile. Of course there are some difference in frequencies between this one and the USA version. Mainly the 2m/440 bands is where the most differences are . On this model, 2m is only 144 to 146 mhz and 70cm is 430 to 440 mhz. . It appears the typical MARS mod does not expand these 2 bands to get the full US frequencies. I would like to expand these 2 bands so I'm asking here if anyone knows if this possible and what would be the procedure be. Thanks!
?
73 Andrew K5KNM
|
Re: IC7000 no HF Transmit
Forgive me if this has been mentioned before but as this is the 29th reply I haven't gone back and read everything.
?
I always go first to where the effect of a fault is obvious without any ambiguity, in this case the rf output ie Ant 1 connector, working back to eliminate ALL the stages involved, including in this case the SO32 jack.
?
Good luck.
?
Geoff
VK3ZGW
|
Re: IC7000 no HF Transmit
Thanks Tommy. much appreciated. I thought there was only one version in circulation.
Anyway sounds like you have some good advice from members here . It does sound like RF power is being lost somewhere before the output connector.
Hope you find the fault soon
James
|
Re: IC7000 no HF Transmit
Thanks
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On 23 Jan 2025, 16:18, at 16:18, "Tommy Wooten via groups.io" <kf4rwg@...> wrote: James,
The link to all the updates of the Ic7000 service manual is here:
They are all included, newest to oldest.
Tommy
On Wed, Jan 22, 2025 at 8:34?PM James Tiberius via groups.io
<nono2212000=
[email protected]> wrote:
Thanks Tommy
|
Re: IC7000 no HF Transmit
James, The link to all the updates of the Ic7000 service manual?is here:
They are all included, newest to oldest. Tommy
On Wed, Jan 22, 2025 at 8:34?PM James Tiberius via <nono2212000= [email protected]> wrote: Thanks Tommy?
|
Re: IC7000 no HF Transmit
Apply a DC via a resistor to JHFOR, see if the power folds back and current drops
Then you can work on it and trace
73
Andrew
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On 23 Jan 2025, 15:51, at 15:51, Andrew Lenton <a@...> wrote: Hi Tommy again,
Also looking at the block diagram, I can see the TX and RX share the
LPF, which actually turns out to be Band Pass filters!! Fairly wide.
How does the RF get to the filter board is it a track mini co-ax, as
you need to break in and see if you can measure the power before the
filter, or I/p to relay?
I know this is all on one board, do isolating is tricky, to remove this
board, you have to desolder the pre amp board, if you do not have a
proper de soldering station, then stop.
You need to find out where the RF is going or being blocked.
73
Andrew
If you were closer I would repair free of charge!
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On 23 Jan 2025, 15:32, at 15:32, Andrew Lenton <a@...> wrote:
Hi Tommy,
Can you turn the power down on FM or CW to a few watts?
This will help with signal tracing
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On 23 Jan 2025, 15:13, at 15:13, "Tommy Wooten via groups.io"
<kf4rwg@...> wrote:
Andrew
Yes the current supply varies with usb modulation. That is why I put
the
mode to FM for the supply current test. The odd thing to me is that
the
supply current is substantially higher with the higher bands. I do see
a
smaller but discernible ssb modulation in current at 160M.
The FM transmit at 10M a quick rise in heat on the PCB near L303. I do
see
a high level of RF at the output of each of the PA transistors and the
level is substantially lower at the L305 output and down stream through
the
LPF to the ANT1. As a result the output power at ANT1 is only
milliwatts
on the external power meter and dummy load.
I hope this description help's.
Thank you
Tommy
On Thu, Jan 23, 2025 at 9:18?AM Andrew Lenton via groups.io <a=
[email protected]> wrote:
Hi,
You need to find out if there is RF power being generated. The current is
a clue, so switch to USB key up you should draw a few amps bias current,
the speak CQCQ ect, the current should peak in sympathy with you voice. If
it remains high you have a fault in the PS.
If the current remains the same check mic gain if ok, then you have no
drive.
KR
Andrew
Get back to me
Do you have a spectrum analyser?
?Get BlueMail for Android ?
On 23 Jan 2025, 01:33, at 01:33, "James Tiberius via groups.io"
<nono2212000@...> wrote:
Thanks Tommy
|
Re: IC7000 no HF Transmit
All well and good, but there must be an O/C some where in the TX path! Or a S/C cap
73
Andrew
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On 23 Jan 2025, 15:43, at 15:43, "J.D. Barron via groups.io" <jeter.d.barron@...> wrote: The power control will not reduce power if the forward power
measurement circuit is not receiving power. As it is after the bandpass
filters and that is where the problem seems to be. Currently the power
is only controlled by the current limit settings to the CPU.
I suggest signal tracing in SSB and adding only a small audio signal to
limit the power loading to reduce the load on the PA transistors.
This is why I brought this up earlier.
All of the above is from perhaps incorrect recollection, however. I do
believe that this is the case. Power cannot be turned down if the
forward power measuring circuit does not sent the power level back to
the CPU.
JD
KE4MD
|
Re: IC7000 no HF Transmit
Hi Tommy again,
Also looking at the block diagram, I can see the TX and RX share the LPF, which actually turns out to be Band Pass filters!! Fairly wide.
How does the RF get to the filter board is it a track mini co-ax, as you need to break in and see if you can measure the power before the filter, or I/p to relay?
I know this is all on one board, do isolating is tricky, to remove this board, you have to desolder the pre amp board, if you do not have a proper de soldering station, then stop.
You need to find out where the RF is going or being blocked.
73
Andrew
If you were closer I would repair free of charge!
?Get BlueMail for Android ?
toggle quoted message
Show quoted text
On 23 Jan 2025, 15:32, at 15:32, Andrew Lenton <a@...> wrote: Hi Tommy,
Can you turn the power down on FM or CW to a few watts?
This will help with signal tracing
?Get BlueMail for Android ?
On 23 Jan 2025, 15:13, at 15:13, "Tommy Wooten via groups.io"
<kf4rwg@...> wrote:
Andrew
Yes the current supply varies with usb modulation. That is why I put
the
mode to FM for the supply current test. The odd thing to me is that
the
supply current is substantially higher with the higher bands. I do see
a
smaller but discernible ssb modulation in current at 160M.
The FM transmit at 10M a quick rise in heat on the PCB near L303. I do
see
a high level of RF at the output of each of the PA transistors and the
level is substantially lower at the L305 output and down stream through
the
LPF to the ANT1. As a result the output power at ANT1 is only
milliwatts
on the external power meter and dummy load.
I hope this description help's.
Thank you
Tommy
On Thu, Jan 23, 2025 at 9:18?AM Andrew Lenton via groups.io <a=
[email protected]> wrote:
Hi,
You need to find out if there is RF power being generated. The current is
a clue, so switch to USB key up you should draw a few amps bias current,
the speak CQCQ ect, the current should peak in sympathy with you voice. If
it remains high you have a fault in the PS.
If the current remains the same check mic gain if ok, then you have no
drive.
KR
Andrew
Get back to me
Do you have a spectrum analyser?
?Get BlueMail for Android ?
On 23 Jan 2025, 01:33, at 01:33, "James Tiberius via groups.io"
<nono2212000@...> wrote:
Thanks Tommy
|
Andrew Lenton
Bob
James F. Boehner, MD