Yeah, I´ve seen this before in a couple of PPG Wave´s and a few other
devices.
There´s not a lot of to get in there and do such a mod. I think just
replacing it with a similar one will be a big hassle due to the
construction. Getting the card out means stripping the whole mainframe down
to its bare minimum.
WT
----- Original Message -----
From: "gordonjcp" <gordon@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Sunday, September 18, 2011 2:38 PM
Subject: [Simmons Drums] Re: SDS7 repairs
>
>> I have replaced the capacitor on the +5V rail but there is still around
>> 1V
>> AC half wave noise on it. Both before the regulator and after the
>> regulator.
>> This leads me to believe that I need to replace the rectifier bridge with
>> one that can output more current.
>
> The diode bridge has failed, with one diode going short-circuit. This is
> surprisingly common - far more than failed capacitors which never go
> unless they get cooked off by a shorted rectifier!
>
> Any very large diode bridge will do. I would tend to make one up out of
> discrete 10A 400V diodes, but only because I've got hundreds of them to
> get through ;-)
>
> Gordon MM0YEQ
>
>
>
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