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.?
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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.
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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.
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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?
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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 ?
toggle quoted message
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
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Dim display or white light break through
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
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Hi I fixed over 5 units with this exact same fault, if the relay still clicks this is a good sign, the R2011 4R7 is a 1 Watt device 2512 SM resistor, it is a shame it is on the under side of the baord. The only advice I can give is to be very carefull with the ribbon cables, if you pull them off the the PA board, then you have to strip the whole radio down, to reattach, which means desoldering the RF driver board and aeril sockets.
?
73
?
Andrew G8UUG
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Re: 2 meter sideband audio
Ok thank you Allison for that explanation.
?
73
John Denison
KD5YOU
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Re: 2 meter sideband audio
Most modern radios frequency error increases (multiplies) with
operating frequency.? So a 10Hz error at 14mhz is likely to be
not noticed at 50mhz its about 25hz at at 144? near 100hz.
?
The dial is the "programmed frequency" to the internal logic and
microprocessor and with errors the actual output frequency will
be off.? The output frequency contains error based on the
system clock (timebase).?
?
?
--
Allison
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Re: 2 meter sideband audio
Ok thanks for the replies. Next time I'll try to fine tune the signal. Audio seems to be fine on HF bands so this is probably just a 2 meter issue that can be easily solved with finer tuning.
?
73
John Denison
KD5YOU
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Andrew Lenton
