Pete:
Did you first check for damaged diodes D1 & D2 on the SWR board? That may be
your ALC problem.
Donnie / WA9TGT
Sent from my iPhone
On Feb 9, 2013, at 1:25 PM, Mike Bryce <prosolar@sssnet.com> wrote:
> Pete,
>
> did you follow the adjustment procedure in the manual?
>
> the ALC is set by both the front panel control and ALC trimmer on the
> LLdriver.
>
> Mike
>
>
>
> On Feb 8, 2013, at 8:44 PM, N6QW wrote:
>
>> Looking for someone who knows and understands the innards and outards of
>> the TT Corsair I ALC circuit.
>>
>> On the Corsair I, I am refurbishing, The ALC controls do not seem to
>> function. At first I thought it might be a circuit problem with the ALC
>> circuit devices and replaced all of them. Same issue. The ALC barely lights
>> when you adjust R11 and R15 has no effect at reducing the power. I
>> temporarily put an LED on the ALC board connector as can get that to
>> dim.brighten with an adjustment of the panel mounted ALC control but not as
>> it should as that is for very low power levels as controlled by the Drive
>> control --and the panel LED is really dim.
>>
>> At low power levels the temporary LED will come on when you key the MIC but
>> dims on voice peaks which is the reverse of what it should do. I measured
>> the voltages on all of the devices Q4-Q9 and the values are close to what
>> the TT manual says they should be -- so nothing there.
>>
>> Any one have any suggestions or clues on how to fix the ALC. Rather than
>> clog up the reflector please reply directly to radioguy90@hotmail.com
>>
>> 73's
>> Pete N6QW
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