Re: IC7000 no HF Transmit
James I think you have a typo.? Instead of c337 I think you meant c327?? I have already checked for shorts and opens in this area.? It is interesting that the age of this unit does not have L306 and c326.? Later schematics (attached) do not have these components. One thing I have not checked is L305 for shorts or opens.? I would have to unsolder from the circuit to check this. I wonder if c319 or c320 could have an affect if open, ?I will check. One thing I have not mentioned is that r317 and r318 are dark from excess heat.? I did remove them and they both checked 10 ohms.? Possibly L304 is shorted or open?
I will report my findings.? Keep the ideas coming
Thanks Tommy
Hi Tommy
Check for open or short circuits after L305.
Open l306 or c337 or shorted c326
James?
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Re: IC7000 no HF Transmit
Hi Tommy
Check for open or short circuits after L305.
Open l306 or c337 or shorted c326
James?
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Re: IC7000 no HF Transmit
Ok, I have done some additional test at 10M where the supply current is around 15 amps.? When in FM TX, there is a quick rise in temperature on the surface of the board near the circuit of L303 located between the two power FETS.? Power setting has no affect on the results. ? Could there be an oscillation???
I have attached this portion of the schematic.
Any suggestions are appreciated
Thanks Tommy KF4RWG
I received the radio in this condition.? The only evidence of rework from the previous owner was the rx/tx relay had been replaced.? Some of the thru holes for the relay leads had been disturbed.? Maybe the “no TX” issue was the reason the owner replaced the relay.? I removed the relay and closely inspected the traces and thru holes.? Everything seems to be intack.? As I mentioned, the receive works exceptional in all bands.? This tells me that all LPFs are working.? I tried the TX TOTAL GAIN adjustment procedure but no increase in power out. ? I am adding a couple of schematic views.? First is the rx/tx relay just beyond the PA circuit.? The second is the forward/reverse detector for the power control and SWR. ?
Thanks Tommy KF4RWG
True, but nothing is coming the aerial socket so there is an issue post PA and LPF probably a pin diode!
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On 22 Jan 2025, 13:35, at 13:35, "J.D. Barron via " <jeter.d.barron=gmail.com@groups.io> wrote:
>If there is a problem with the transmit chain before the forward /
>reverse power measurement circuit reducing the power may not change to
>amount of power drawn by the PA.
>Most transceivers control the drive from the forward power measured by
>the For/Rev circuits.
>
>
>
|
Re: IC7000 no HF Transmit
I received the radio in this condition.? The only evidence of rework from the previous owner was the rx/tx relay had been replaced.? Some of the thru holes for the relay leads had been disturbed.? Maybe the “no TX” issue was the reason the owner replaced the relay.? I removed the relay and closely inspected the traces and thru holes.? Everything seems to be intack.? As I mentioned, the receive works exceptional in all bands.? This tells me that all LPFs are working.? I tried the TX TOTAL GAIN adjustment procedure but no increase in power out. ? I am adding a couple of schematic views.? First is the rx/tx relay just beyond the PA circuit.? The second is the forward/reverse detector for the power control and SWR. ?
Thanks Tommy KF4RWG
True, but nothing is coming the aerial socket so there is an issue post PA and LPF probably a pin diode!
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On 22 Jan 2025, 13:35, at 13:35, "J.D. Barron via " <jeter.d.barron=gmail.com@groups.io> wrote:
>If there is a problem with the transmit chain before the forward /
>reverse power measurement circuit reducing the power may not change to
>amount of power drawn by the PA.
>Most transceivers control the drive from the forward power measured by
>the For/Rev circuits.
>
>
>
|
Re: IC7000 no HF Transmit
True, but nothing is coming the aerial socket so there is an issue post PA and LPF probably a pin diode!
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On 22 Jan 2025, 13:35, at 13:35, "J.D. Barron via groups.io" <jeter.d.barron@...> wrote: If there is a problem with the transmit chain before the forward /
reverse power measurement circuit reducing the power may not change to
amount of power drawn by the PA.
Most transceivers control the drive from the forward power measured by
the For/Rev circuits.
|
Re: IC7000 no HF Transmit
If there is a problem with the transmit chain before the forward / reverse power measurement circuit reducing the power may not change to amount of power drawn by the PA.
Most transceivers control the drive from the forward power measured by the For/Rev circuits.?
|
Re: IC7000 no HF Transmit
I will check the circuit, set the power to 5% for safety
73
Andrew
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On 21 Jan 2025, 21:17, at 21:17, "Tommy Wooten via groups.io" <kf4rwg@...> wrote: Andrew,
I set each band to FM and measured the power supply current at each
band.
I found that 160M measured 5 amps and 6M measured 20 amps. The current
increased from 160M to 6M in a linear fashion. The external RF power
meter
never shows more than a few milliwatts at any of the bands.
Where should I measure the signal along the hf filter path?
Thank you so much.
On Tue, Jan 21, 2025 at 12:15?PM Andrew Lenton via groups.io <a=
lenton.org@groups.io> wrote:
Measure the current from the power supply, if 18-20 odd amps then the
power is being generated, but being lost in the RF LPF or certainly in
that path, if current only 2-3 amps, then the HF pa transistors are not
been driven!
KR
Andrew
*From:* ic7000@groups.io <ic7000@groups.io> *On Behalf Of *Tommy Wooten
via groups.io
*Sent:* 21 January 2025 00:35
*To:* ic7000@groups.io
*Subject:* [ic7000] IC7000 no HF Transmit
I purchased an IC7000 with the condition that will not transmit on all HF
bands. VHF/UHF transmit at the designed power out in all modes. Receiver
works excellent in all bands all modes. Since VHF/UHF transmit proves that
the Driver circuit works I have focused on the HF circuit. With a scope, I
see hf signal through the driver and through the power transistors Q301 and
Q302. The bias current is set properly. All board traces seem to be
in-tack and pass the signal through to the ANT1 connector when terminated
with a dummy load, but the signal barely registers on the external power
meter when the power control is set to 100%.
Any help for further troubleshooting will be greatly appreciated.
Thanks
Tommy KF4RWG
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Re: IC7000 no HF Transmit
Hi Andrew
do you know the full history of the radio?
There are many factors that could produce the results you describe.
The fact that the radio is drawing 20A at 6M means that power is being dissipated but not exiting the antenna port into a load.
" I found that 160M measured 5 amps and 6M measured 20 amps"
Something must be getting hot. A infrared camera would help detecting the hot areas
James
?
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Re: IC7000 no HF Transmit
Andrew,
I set each band to FM and measured the power supply current at each band.? I found that 160M measured 5 amps and 6M measured 20 amps.? The current increased from 160M to 6M in a linear fashion.? The external RF power meter never shows more than a few milliwatts at any of the bands.
Where should I measure the signal along the hf filter path?
Thank you so much.
Measure the current from the power supply, if 18-20 odd amps then the power is being generated, but being lost in the RF LPF or certainly ?in that path, if current only 2-3 amps, then the HF pa transistors are not been driven! ? KR ? Andrew ? ? I purchased an IC7000 with the condition that will not transmit on all HF bands.? VHF/UHF transmit at the designed power out in all modes.? Receiver works excellent in all bands all modes.? Since VHF/UHF transmit proves that the Driver circuit works I have focused on the HF circuit.? With a scope, I see hf signal through the driver and through the power transistors Q301 and Q302.? The bias current is set properly.? All board traces seem to be in-tack and pass the signal through to the ANT1 connector when terminated with a dummy load, but the signal barely registers on the external power meter when the power control is set to 100%. Any help for further troubleshooting will be greatly appreciated.
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Re: IC-7000 corrupted eeprom
Just an update.
I believe to read flash contents of MCU a Renesas E10A emulator is required.
The above is the E10A connection to MCU
?
The below is the connection to the MCU on the 7000.
I have tried using RS232 direct but no joy.
?
?
?
If anyone has access to a E10A debugger/emulator then firmware extraction may be possible.
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Re: Japanese Version Icom IC 7000
They are all Japanese manufactured.
?
If you mean for the Japanese market...? They have some rules
we don't especially modding for out of band being prohibited.
OLder radios might not, open bet.
?
So many of the JA only radio cannot be modified? for all USA bands.
(Note this has come up for cheaper for JA IC7300s, you can't!)
?
see thread starting with ?/g/ic7000/message/42796
?
?
--
Allison
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Re: IC7000 no HF Transmit
Double check for fuse oxidization if using the factory power cords.... Pop them out and re-insert etc.
Measure the current from the power supply, if 18-20 odd amps then the power is being generated, but being lost in the RF LPF or certainly ?in that path, if current only 2-3 amps, then the HF pa transistors are not been driven! ? KR ? Andrew ? ? I purchased an IC7000 with the condition that will not transmit on all HF bands.? VHF/UHF transmit at the designed power out in all modes.? Receiver works excellent in all bands all modes.? Since VHF/UHF transmit proves that the Driver circuit works I have focused on the HF circuit.? With a scope, I see hf signal through the driver and through the power transistors Q301 and Q302.? The bias current is set properly.? All board traces seem to be in-tack and pass the signal through to the ANT1 connector when terminated with a dummy load, but the signal barely registers on the external power meter when the power control is set to 100%. Any help for further troubleshooting will be greatly appreciated.
|
Re: IC7000 no HF Transmit
Measure the current from the power supply, if 18-20 odd amps then the power is being generated, but being lost in the RF LPF or certainly ?in that path, if current only 2-3 amps, then the HF pa transistors are not been driven! ? KR ? Andrew ?
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From: ic7000@groups.io <ic7000@groups.io> On Behalf Of Tommy Wooten via groups.io
Sent: 21 January 2025 00:35
To: ic7000@groups.io
Subject: [ic7000] IC7000 no HF Transmit? I purchased an IC7000 with the condition that will not transmit on all HF bands. ?VHF/UHF transmit at the designed power out in all modes. ?Receiver works excellent in all bands all modes. ?Since VHF/UHF transmit proves that the Driver circuit works I have focused on the HF circuit. ?With a scope, I see hf signal through the driver and through the power transistors Q301 and Q302. ?The bias current is set properly. ?All board traces seem to be in-tack and pass the signal through to the ANT1 connector when terminated with a dummy load, but the signal barely registers on the external power meter when the power control is set to 100%. Any help for further troubleshooting will be greatly appreciated.
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Re: Dim display or white light break through
Hi I have found the fault on the IC7000, it turns out to be a faulty inductor L51 near Q51 in the BUK converted that generates (or not) the 12V for the display, parts are on order. ? 73 ? Andrew ?
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From: ic7000@groups.io <ic7000@groups.io> On Behalf Of 9h1kr via groups.io
Sent: 21 January 2025 05:08
To: ic7000@groups.io
Subject: Re: [ic7000] Dim display or white light break through? Hi Andrew, I came across a Ic-7300 at a very good price and kept on working like nothing happened, came by at the right time too.? I'm think about sourcing the pa's first for the ic-7000, otherwise the vhf/uhf bands work fine, and as for hf reception comparison with the 7300 I find it better for filtering out weak signals imho!
73 de 9H1KR ? ? On Mon, 20 Jan 2025 at 11:13, Andrew Lenton Hi not sure it is common, fault but through it out there, did you fix it? ? KR ? Andrew ? ? Hi, have same issue with right hand edge brightness of the screen, was wondering if it is a common issue apart from hf o/p pa's blowing out.
73 ? On Sun, 19 Jan 2025 at 20:27, Andrew Lenton I have had two units with a dim display and one where the there is white light break through on the right hand edge, is? a replacment display the cure? what else could cause this? what does the -15V do and the +12 V do from the BUK converter, PS I have had a few 100?H inductors die (in the Buk inverter) , but this will effect switch on.
|
Re: Dim display or white light break through
Hi Andrew,
I came across a Ic-7300 at a very good price and kept on working like nothing happened, came by at the right time too.?
I'm think about sourcing the pa's first for the ic-7000, otherwise the vhf/uhf bands work fine, and as for hf reception comparison with the 7300 I find it better for filtering out weak signals imho!
73 de 9H1KR
On Mon, 20 Jan 2025 at 11:13, Andrew Lenton <a@...> wrote: Hi not sure it is common, fault but through it out there, did you fix it? ? KR ? Andrew ? From: ic7000@groups.io <ic7000@groups.io> On Behalf Of 9h1kr via groups.io
Sent: 19 January 2025 19:37
To: ic7000@groups.io
Subject: Re: [ic7000] Dim display or white light break through ? Hi, have same issue with right hand edge brightness of the screen, was wondering if it is a common issue apart from hf o/p pa's blowing out.
73 ? On Sun, 19 Jan 2025 at 20:27, Andrew Lenton I have had two units with a dim display and one where the there is white light break through on the right hand edge, is? a replacment display the cure? what else could cause this? what does the -15V do and the +12 V do from the BUK converter, PS I have had a few 100?H inductors die (in the Buk inverter) , but this will effect switch on.
|
Re: Japanese Version Icom IC 7000
That's what I'm trying to work out.
?
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Japanese Version Icom IC 7000
Can a Japanese manufactured version be reconfigured to receive all USA frequencies?
|
I purchased an IC7000 with the condition that will not transmit on all HF bands. ?VHF/UHF transmit at the designed power out in all modes. ?Receiver works excellent in all bands all modes. ?Since VHF/UHF transmit proves that the Driver circuit works I have focused on the HF circuit. ?With a scope, I see hf signal through the driver and through the power transistors Q301 and Q302. ?The bias current is set properly. ?All board traces seem to be in-tack and pass the signal through to the ANT1 connector when terminated with a dummy load, but the signal barely registers on the external power meter when the power control is set to 100%.
Any help for further troubleshooting will be greatly appreciated.
Thanks
Tommy KF4RWG
|
Re: Dim display or white light break through
Hi not sure it is common, fault but through it out there, did you fix it? ? KR ? Andrew ?
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Show quoted text
From: ic7000@groups.io <ic7000@groups.io> On Behalf Of 9h1kr via groups.io
Sent: 19 January 2025 19:37
To: ic7000@groups.io
Subject: Re: [ic7000] Dim display or white light break through? Hi, have same issue with right hand edge brightness of the screen, was wondering if it is a common issue apart from hf o/p pa's blowing out.
73 ? On Sun, 19 Jan 2025 at 20:27, Andrew Lenton I have had two units with a dim display and one where the there is white light break through on the right hand edge, is? a replacment display the cure? what else could cause this? what does the -15V do and the +12 V do from the BUK converter, PS I have had a few 100?H inductors die (in the Buk inverter) , but this will effect switch on.
|
Re: Dim display or white light break through
Hi, have same issue with right hand edge brightness of the screen, was wondering if it is a common issue apart from hf o/p pa's blowing out. 73
On Sun, 19 Jan 2025 at 20:27, Andrew Lenton <a@...> wrote:
Hi,
?
I have had two units with a dim display and one where the there is white light break through on the right hand edge, is? a replacment display the cure? what else could cause this?
?
what does the -15V do and the +12 V do from the BUK converter, PS I have had a few 100?H inductors die (in the Buk inverter) , but this will effect switch on.
?
73
?
Andrerw G8UUG
|
Andrew Lenton