Later circuits for that unit (The Ampliphone series) added a back emf
diode across the input/output of the two voltage regulators, there was
also a 15 ohm (or so) 5 watt resistor addded in series with the input to
the regulators to reduce the input voltage a bit. This should save
yours...The diode goes in with the band to the positive side of the
circuit, a 1N4005 was used (I STILL don't think they are fast enough) by
Atari in this mod...perhaps someone with one of those units in hand can
confirm the resistor value (I always seem to be at home when these
questions appear)
John :-#)#
MKDUD@aol.com wrote:
>
> In a message dated 2/22/99 9:30:29 PM Eastern Standard Time,
> jwelser@ccwf.cc.utexas.edu writes:
>
> << What about the BU406D?
>
> That would be my first guess at the most likely culprit...
> >>
>
> Yes, I did change the BU406D and replaced it with a new one. I also replaced
> the MPSU07, as well as my 555, and checked ALL caps and resistors in the
> oscillator curcuit. Any other suggestions?
>
> Thanks Very Much,
> Michael Kelley
-- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games) mailto:jrr_at_flippers.com, web page http://www.flippers.com "Old pinballers never die, they just flip out."Received on Tue Feb 23 01:40:56 1999
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