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Yamaha CS80

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Message

Re: Help! I blew up the +8.5 rail

2009-02-19 by mborish_2000

Never mind, I figured it out.  I didn't see the two transistors hiding
behind the fuse assembly.

--- In yamahacs80@yahoogroups.com, "mborish_2000" <mborish_2000@...>
wrote:
>
> I flinched and the +8.5 rail got shorted to the -15 volt rail.  My
> +8.5 rail now reads about +3.5 volts.  I tried replacing the Op-amp
> with one I had lying around. That didn't work.  I can't seem to figure
> out what transistors are associated with the bad rail either.
> 
> Further inspection revealed that that my PSU is not the same as the
> diagram that I downloaded off of the internet.  Does anybody have
> another schematic version for my CS-80 PSU?    Mine is one of the
> later models based on the temperature designations associated with the
> module boards.
> 
> On another note, some of you folks were right about me screwing up the
> solder job.  I found one mistake so far.
> 
> 
> -Mike
>

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