Vintage Simmons Drums (UK) Users Group

Yeah, I\ufffdve seen this before in a couple of PPG Wave\ufffds and a few other 
devices.

There\ufffds 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
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>