[Lowfer] Icom R75 NB

[Warren K2ORS]

John,

    Thanks! Will have a look at IC411, Q731-737 and associated components.

    73 Warren



On 2/26/2015 2:19 PM, John Andrews wrote:
> Warren,
>
> I'd be looking for dried-out SMT electrolytics. Presuming that you have
> the schematic, check that IC411 and associated circuitry is really
> making -5V. If not, then change the electrolytics around it. If memory
> serves, that circuitry is inside a can on the board.
>
> If the -5V is OK, then the problem may be in the noise blanker
> circuitry. That's Q731 through 737 and IC731. Never had to work on it.
>
> All R75's should have the noise blanker.
>
> John, W1TAG
>
> On 2/26/2015 2:07 PM, k2ors at verizon.net wrote:
>>   Hi,
>>     I have two Icom R75s, in one the noise blanker is very effective,
>> in the other it seems to make no difference.
>>   Did Icom sell a version of the R75 without a noise blanker or do I
>> have one with a fault or alignment issue?
>> Tnx
>>
>>   73 Warren K2ORS
>>   WD2XGJ
>>   WD2XSH/23
>>   WE2XEB/2
>>   WE2XGR/1
>>


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