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[wxsig] Help with T-238 failure

John Koster w9ddd at tapr.org
Sat Jul 2 14:49:56 UTC 2005


On Sat, 2 Jul 2005 Sct599 at aol.com wrote:

>  
> John, Bill, and Will:
>  
> I got a hold of a an oscope and both of the ocillators appear to be dead.  
> With the good news that the semiconductors are tough, my next move will be to  
> test the LCD. I am going to try to get a local guy to allow me to connect my 
> LCD  module to his unit. If it checks OK, I will proceed with the oscillator(s)  
> replacement. I understand the 32Mhz crystal is primary for operation but what 
> is  the 9Mhz used for? Only reason I ask is to determine if I need to replace 
> it at  least initially.
>  
> Thank you for letting me know you have some spare components. This could  
> prove to very handy once I check the LCD and replace the oscillator(s). Should  
> my MPU appear to be failed, I would be happy to send it for the Freescale  
> folks for autopsy.
>  
> Thanks again for your support. I will report back as soon as I get the LCD  
> module checked out.
>  
> 73,
> Scott
>  

You don't need the 9MHZ unless you're going to use it for S/W 
developement.  This is one of the parts that was deleted to make the T238+ 
smaller.


-- 
73,
John, W9DDD





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