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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

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?



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On 23 Jan 2025, 01:33, at 01:33, "James Tiberius via groups.io"
<nono2212000@...> wrote:

Thanks Tommy

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

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
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

Thanks Tommy

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


On Wed, Jan 22, 2025 at 1:30?PM Tommy Wooten via groups.io <kf4rwg=
[email protected]> wrote:

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


On Wed, Jan 22, 2025 at 8:50?AM Andrew Lenton via groups.io <a=
[email protected]> wrote:

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.

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


On Wed, Jan 22, 2025 at 8:50?AM Andrew Lenton via groups.io <a=
[email protected]> wrote:

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.