[sdiy] May Be Somewhat OT: Repairing a DOD 1222 XL Mixer

[dancemachine at gmail.com]

if I were you I'd wait to put all the screws back in until you test  
it.  murphys law: if you test it before buttoning it up, you'll  
probably be fine. if you don't, you'll probably forget the simplest  
connection (or fuse)


_________________________


On Feb 12, 2009, at 9:19 PM, Scott Gravenhorst <music.maker at gte.net>  
wrote:

> cheater cheater <cheater00 at gmail.com> wrote:
>> The circular hole: With a 220V AC I would assume it's a fuse hole.  
>> You
>> can have a fuse that screws into a socket. Lots of equipment has
>> those.
>> http://www.pridediyjunk.com/catalog/images/fuse%20socket.jpg
>> The cap in those (marked with white writings) screws off and opens to
>> show a socket. The fuse is held by a mechanism similar to flashlights
>> etc. Thje thing's diameter is less than under a centimeter, maybe  
>> 7mm,
>> but check a datasheet - the last time I've seen those was several
>> years ago.
>>
>> Putting the fuse right next to the power socket is very classical  
>> as well.
>>
>> 1.8A is still a lot of current and I wouldn't be supprised if this
>> thing were fused.
>>
>> Maybe the wallwart socket was connected through the fuse box in the  
>> first place?
>
> If there's a fuse anywhere in it, I don't see it.  The hole is  
> smaller than a pencil.  there
> could be a fuse inside the wallwart unit, but it's not replacable  
> from the outside like the
> image to which you refer.
>
> BTW, the power supply is repaired, the unit powers up without  
> exploding.  Power light comes
> on and phantom power goes on and off with the phantom switch.  Next  
> will be to test it with a
> real signal and some headphones - but that's for tomorrow after I've  
> finished putting all of
> the screws back in it.  There has to be 40 or 50 of them.
>
>> HTH
>> D.
>>
>> On Wed, Feb 11, 2009 at 3:41 PM, Scott Gravenhorst <music.maker at gte.net 
>> > wrote:
>>> Hello all,
>>>
>>> I'm not sure how off topic this is, it has to do with the mixer
>> I use when recording with my synthesizers... > > Anyway, one of
>> the 4 power supply filter electrolytic caps is obviously blown,
>> so I've ordered them and they should arrive in a few days, I will
>> replace all 4. > > Does anyone have one of these mixers? > > On
>> the rear next to the rectangular hole where the power connector
>> for the wall wart is, there is a round hole - what is supposed to
>> be there? > > Also inside on the "power board" (which is a
>> combination of power supply with two 3-term regulators and also
>> has all of the 1/4 inch output jacks), there is something that
>> looks like it was unsoldered and removed - but I didn't do that,
>> it's labeled H4, has 3 holes for soldered connectors two if which
>> are shorted together and the third is by itself (so it really has
>> only two connections). The wallwart socket connects directly to
>> these pins, one side to the shorted pins, the other to the alone
>> pin - as if > there's an indicator light, but the transformer is
>> AC, so I'm assuming it's not an LED. The wallwart is 10VAC, 1.8A
>> - so it can't be a neon bulb. At first I thought it was a power
>> switch, but that can't be because if it were, it would short the
>> wallwart when closed. > > It's been broken for over a year now,
>> and I've got a bad habit of leaving things like this turned on -
>> I can't remember if it ever had a power switch. It has a power
>> LED indicator on the front panel, but I cannot find a power
>> switch (other than the phantom power switch for the microphone
>> connectors). > > It was not very expensive when I purchased it
>> and I've googled until I'm blue in the face for schematic for it.
>> It's old enough that all parts are through hole. > > Can anyone
>> help - either with a quick look on the back (don't need to open
>> it up) or perhaps someone has a schematic? > > Thanks in advance
>> for any info. > > -- ScottG >
>> ________________________________________________________________________  

>>> -- Scott Gravenhorst > -- FPGA MIDI Synthesizer Information: 
>> home1.gte.net/res0658s/FPGA_synth/ > -- FatMan:
>> home1.gte.net/res0658s/fatman/ > -- NonFatMan:
>> home1.gte.net/res0658s/electronics/ > -- When the going gets
>> tough, the tough use the command line. > >
>> _______________________________________________ > Synth-diy
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>
> -- ScottG
> ________________________________________________________________________
 

> -- Scott Gravenhorst
> -- FPGA MIDI Synthesizer Information: home1.gte.net/res0658s/ 
> FPGA_synth/
> -- FatMan: home1.gte.net/res0658s/fatman/
> -- NonFatMan: home1.gte.net/res0658s/electronics/
> -- When the going gets tough, the tough use the command line.
>
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