Re: Fried Apple IIe

[Cyrus Roton <croton@owens>]

On 31 Mar 1995 Bill_Scheffler@tap.fnet.org wrote:

>        I just received a nonoperational Apple //e and I would like some advice
> on how to go about fixing it.  The previous owner was putting in new RAM chips
> on the motherboard, and he accidentally put them in backward and fried the
> mother board.  I'm guessing that some other chips on the motherboard must be
> bad too (including the RAM).  Does anyone have any idea about what I should
> do?> 

Are you sure the mother board is "fried"?? Are there burned components on 
it, or burned conductors?? If so, the most likely fix is a new mother 
board (available from several venders).

SAMS ComputerFacts, folder CC10, for the Apple IIe, contains schematics 
and trouble shooting info For the IIe and theDisk II. Howard W. Sams, 
800-428-SAMS. Of course, you have to be a technician to read the 
schematics. And, You need a scope to make the described tests.

The first thing to check is the power supply If you do not know the plug 
connections, look on the power supple case (the info should be there). 
The two black wires are ground (as I recall). Also, a good ground point 
is at the shield of the video socket. Don't rely on the power supply 
case, nor the Apple case for ground. Check at the power supply plug for 
+5v, -5v, +12v, -12v. When you turn on the computer on, the indicator 
light and the red LED should light up. If they do not, the power supply 
most likeky is dead. Replae ment power supplies are available from 
several sources.

If the RAMs were inserted backword, then probably they are zapped. Was 
it really RAMs being replaced and not ROMs. Well, if the ROMs are bad, 
they are available too.

If I can be of further help, contact me by email or phone.

Cyrus Roton  619 375 5592
 croton@ridgecrest.ca.us.
Ridgecrest Apple User Group