Emu XL-7 & MP-7 User's Group

Fuse?

My XL7 doesn't have a fuse. Unless there's one inside the power supply enclosure 
(which I would doubt due to its inaccessibility - there might be a polyswitch 
["ptc device" or "resettable (thermal) fuse"]). And there's no brown and/or 
yellow wires.

It has a 10-way single-in-line (molex type) connector on the main board [with 10 
wires coming from the power supply] and next to the connector (on the main 
board) there's a list of the voltage on each pin [+15, -15, GND, GND, +5V, +5V, 
+3.3, +3.3 and two others]. Although there are individual wires from the power 
supply to this connector there are no brown and/or yellow wires as it turns out 
[purple, green, black red, orange...]

It may be that you have a different variant XL7 than I have but I would be 
surprised if there were multiple revisions of the XL7 main board so radically 
different. 


In any case I would surmise that the most-likely problem is that your power 
supply gave up and possibly the main board could have been damaged in the death 
of the power supply. There is no value in turning the power on and risking 
further damage to the main board. If you disconnect the power supply (from the 
main board) you could check the no-load voltage on the power supply connector 
and check what happens under load [if you put a 1K resistor across any two wires 
the voltage should change not at all if the power supply is working properly, 
even a 10ohm resistor should have little effect (except perhaps on the +15 and 
-15 sources which would be unlikely to sustain 1.5A) if applied for a _very_ 
short time]

Solution:

If you can verify that the power supply is defunct then get a new one [although 
if you were sufficiently skilled in electronics you might be able to fix it], 
but the main board may also have suffered damage. The 'new' power supply will 
probably have the same source as the 'new' main board - ebay.




________________________________
From: Dacian <dacian_victor@...>
To: xl7@yahoogroups.com
Sent: Sun, November 14, 2010 12:05:23 AM
Subject: [xl7] Re: my XL-7 does't start anymore !!!

   

ohh man, i think is kind of bad.
I just had a friend with a multimeter, and. The fuse is ok. And on the pins 
coming from the electric source there is 9 volt on (yellow and brown). We have 
no idee what should it be. Any advise would be very apreciate. /Thanks, guys

--- In xl7@yahoogroups.com, "nenad.lonic" <nenad.lonic@...> wrote:
>
> 
> 
> --- In xl7@yahoogroups.com, XL-7 Group <dacian_victor@> wrote:
> >
> > 
> > Hi Guys,
> > I have no ideea what could it happend, yesterday my xl was working perfect 
>and now is not starting. Is looking like no electricity is getting in. I check 
>different cables and different electricity sources. Have any ideea?
> > Thanks
> >
> 
> Open her up, and check that the connector that comes from the on/off button 
>hasn't come out. While it's open put a multimeter across the on/off switch pins 
>and check that its still working