Re: My Ast. Deluxe is on the fritz

Chris,

The one output fluctuating is encouraging. That sounds like the CPU is
running. I would focus on the output section with the stuck voltage. A
common failure part is the TL082CP or AM6012. It also never hurts to throw
it in test mode just to make sure it doesn't have any RAM faults. Good luck!

Mark Hooks
----- Original Message -----
From: "Christopher X. Candreva" <chris@westnet.com>
To: <vectorlist@vectorlist.org>
Sent: Monday, April 16, 2007 2:26 PM
Subject: Re: VECTOR: My Ast. Deluxe is on the fritz

> On Sun, 15 Apr 2007, Bob Langelius wrote:
>
>> One of the x or y seems to be fluctuating around 1-3v the other y or x is
>> steady at around -9v
>>
>> Any idea what I should be looking at? I'd like to try and fix this pcb as
>> all the numbers in the machine match and it has the original roms.
>
> First make sure all power supply voltages are correct.
>
> I usually trouble shoot these with a scope. If the picture is bad at the
> test points, start at the outpouts of the DACs, if it's good there, work
> forward until you find where it goes bad.
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 948-3162
> WestNet Internet Services of Westchester
> http://www.westnet.com/
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Received on Mon Apr 16 22:00:57 2007