KX1 3080 Module High Current & Now No power Out

[Steve Watkins]

Things have been going down hill this last weekend.

Started with a bit higher current than manual stated on 80 meters (65 ma) to read about 105 ma.

Then  I noted that I could not get any power out either.

Rig was working fine with just the 20 and 40 meter module with currents and power out.

I rechecked the voltages on page 11 of the KXB 3080 manual, and note now that on 80 meters, I no longer get 5 vdc on Pad F?.  I am now suspecting some problems on the 3080 module.

I have checked numerous times for the obvious, especially those cautioned about in the errata.

Maybe I haven't troubleshot this correctly, but it seems I should be seeing 5 vdc on Pad F through Q1 on 80 meters.

Kind of floundering now and could use some bright mind input.

Thanks, Steve
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[Don Wilhelm-3]

Steve,

Yes, when everything is working properly, you will have 5 volts on pad F
when on 80 meters.  What is the voltage on pad E when you are on 80
meters?  Make certain that you have pad E connected to the proper point
(see KXB3080 manual figure 7).  Pad E is the control, pad F is the output.

73,
Don W3FPR

Steve Watkins wrote:

> Things have been going down hill this last weekend.
>
> Started with a bit higher current than manual stated on 80 meters (65 ma) to read about 105 ma.
>
> Then  I noted that I could not get any power out either.
>
> Rig was working fine with just the 20 and 40 meter module with currents and power out.
>
> I rechecked the voltages on page 11 of the KXB 3080 manual, and note now that on 80 meters, I no longer get 5 vdc on Pad F?.  I am now suspecting some problems on the 3080 module.
>
> I have checked numerous times for the obvious, especially those cautioned about in the errata.
>
> Maybe I haven't troubleshot this correctly, but it seems I should be seeing 5 vdc on Pad F through Q1 on 80 meters.
>
> Kind of floundering now and could use some bright mind input.
>
> Thanks, Steve

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[Steve Watkins]

Don:

I rechecked that Pad E is connected to the proper point.  Prior to
installing the LPF board, I made the checks on page 11 of the 3080 meter
module and saw 5 vdc on Pad F as stated in the last step of Box 1.  I see
from my notes that at this point I did record 47 ma in step 3 on page 11 vs.
the suggested 34-37 ma.

I have lifted the wire from the bottom of the KX1 board that runs from Pad F
and then to the + side of C9 to try and replicate what I was reading before
the installation of the LPF board.

Here are the readings:

3.533 Mhz, Pad E = 6.3 mv, Pad F = 0.7 VDC, Pad D = 4.83 VDC

7.039 Mhz, Pad E = 5.01 VDC, Pad F = 0.2 mv, Pad D = 0.2 mv

6.710 MHz, Pad E = 5.01 VDC, Pad F = 0.2 mv, Pad D = 4.83 VDC

10.120 MHz, Pad E = 5.01 VDC, Pad F = 0.2 mv, Pad D = 4.9 VDC

14.100 MHz, Pad E = 5.01 VDC, Pad F = 0.2 mv, Pad D = 0.2 mv

All above readings on Pad 5 = 5 VDC

I'm considering removing the LPF board and going back to where I was after
initial installation of the 3080 board, when I was getting the 5 VDC on Pad
F on 80 meters... not sure what that will tell me, but it would be doing
something hi hi.

Thanks, Steve
----- Original Message -----
From: "Don Wilhelm" <[hidden email]>
To: "Steve Watkins" <[hidden email]>
Cc: <[hidden email]>
Sent: Monday, May 21, 2007 8:40 PM
Subject: Re: [Elecraft] KX1 3080 Module High Current & Now No power Out

> Steve,
>
> Yes, when everything is working properly, you will have 5 volts on pad F
> when on 80 meters.  What is the voltage on pad E when you are on 80
> meters?  Make certain that you have pad E connected to the proper point
> (see KXB3080 manual figure 7).  Pad E is the control, pad F is the output.
>
> 73,
> Don W3FPR
>
> Steve Watkins wrote:
>> Things have been going down hill this last weekend.
>>
>> Started with a bit higher current than manual stated on 80 meters (65 ma)
>> to read about 105 ma.
>>
>> Then  I noted that I could not get any power out either.
>>
>> Rig was working fine with just the 20 and 40 meter module with currents
>> and power out.
>>
>> I rechecked the voltages on page 11 of the KXB 3080 manual, and note now
>> that on 80 meters, I no longer get 5 vdc on Pad F?.  I am now suspecting
>> some problems on the 3080 module.
>>
>> I have checked numerous times for the obvious, especially those cautioned
>> about in the errata.
>>
>> Maybe I haven't troubleshot this correctly, but it seems I should be
>> seeing 5 vdc on Pad F through Q1 on 80 meters.
>>
>> Kind of floundering now and could use some bright mind input.
>>
>> Thanks, Steve
>

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