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[wxsig] T-238+ modem2 No Text on Display

Charles Suhr charles at ccsuhr.com
Sun Apr 22 14:56:50 UTC 2007


I'm running a 9vdc input.  And the unit was powered off before I started
this test.

Charles

-----Original Message-----
From: wxsig-bounces at lists.tapr.org [mailto:wxsig-bounces at lists.tapr.org] On
Behalf Of Dave
Sent: Sunday, April 22, 2007 9:46 AM
To: TAPR Weather Station SIG Mailing List
Subject: Re: [wxsig] T-238+ modem2 No Text on Display

Are you supplying it 12 volts?  This sounds like the temperature problem a 
lot of us had.  The voltage regulator in the 238 doesn't like 12 volts and 
overheats.  We put in a voltage regulator to drop the 12 volts down to I 
think 8, and then the regulator in the 238 knocked it down more to what it 
liked.  I am sure the more techy people will give you more info.

Dave

----- Original Message ----- 
From: "Charles Suhr" <charles at ccsuhr.com>
To: <wxsig at lists.tapr.org>
Sent: Sunday, April 22, 2007 6:40 AM
Subject: [wxsig] T-238+ modem2 No Text on Display


>I having a problem get text to show on the display.  I just completed build
> my T-238 and Modem2.
>
> Working my way through the power up and testing everything was working 
> like
> a champ till I got to the point of connecting the LCD screen; I mid 
> position
> the contrast pot and had 4 rows of boxes no matter where I adjusted the 
> pot
> I got no text.
>
> Contrast varied from no boxes to the 4 rows of boxes.  Any Ideas?
>
> I check pin to pin from t-238 to LCD module looking for a open but got 
> good
> results.
>
> The Activity LED flashes just like it supposed to and voltage measurement
> on U1 and U2 are fine.
>
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>
>
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