Thanks.  How do I check a wallbrick without a load?  I assume it only puts 
out the voltage it says under the load it's designed for, and without a 
load the voltage would be way off.

On Friday, May 6, 2016 at 8:02:10 AM UTC-4, Mike Mitchell wrote:
>
> Another component to check is the wall-brick power supply. I have a clock 
> with a 4-amp 5v supply, it worked fine for over a year then started acting 
> strangely. Under load the wall brick was only putting out 3.5v, no load it 
> was up at 5v. I replaced the wall brick and all is well.
> http://transistorclock.com/cal/index.html
>
>
> On Friday, May 6, 2016 at 6:25:26 AM UTC-4, Mitch wrote:
>>
>> I had a similar problem a couple months ago. The solution was to replace 
>> the RS-232 level shifter chip. I don't remember the part number, but it was 
>> a MAX chip. Good luck. Hopefully it is something simple and not the 
>> processor. 
>
>

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