[TechAssist] Re: ctc203ax Dead
- From: "becyn" <becyn@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 24 Dec 2003 16:06:58 -0500
check the state of the reset pin on the micro before declaring it dead! It
MUST have a good solid H state > 4.5 V to be valid. Anything less may cause
an 'indeteminate" state which will cause the micro to work intermittantly or
not at all. Sometimes the 3 pin reset IC is the culpret.
Jim McVey
McVey Alltronix
327 Broadway
Newburgh Ny 12550
ph: 845 561 8383
fx: 845 561 9017
Consumer electronics &
computer service.
Factory authorized for
over twenty brands.
----- Original Message -----
From: "D Trippel" <dtrippel@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, December 24, 2003 2:44 PM
Subject: [TechAssist] ctc203ax Dead
> Hello Everyone.
>
> I am working on a ctc203ax. There is no data activity on micro. 5volts
> is present,the 4mhz crystal is running. I shorted Q104 c to e to force u
> 104 on. With pins 3&4 lifted on micro I get the 5 volts on lines 3 &4
> to micro. When re-soldered, voltage drops to less than 1v. I also have
> 5v on pin 8 of u 102. I suspect the micro is bad. Any advice would be
> appreciated . Merry Christmas & Happy new year!
>
> Don's Electronics
> Rosthern,Sask
> Canada
>
>
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