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

Hi gonz...

the website is a bit ambiguouis.....if you go to the home page, then 
click on the tab for the lowest voltage internal PSUs ...you will 
find a PTE43-??-c, and this is the one that is referred to in the 
audio fanzine magazine....and though it is only 6pin output...its 
dimensions exactly match the psu in my xl7 & it looks 
identical....surely this is the replacement psu for the faulty one? 
or is this what they used in the later comand stations.....did they 
somehow change the circuitry for the standbye mode? why does the emu 
psu have so many different voltage outputs anyway....no wonder they 
never used a wall wart transformer thingamajiggy....

 I will mail you a photo of the psu showing what I think are 
symptomns of minor meltdown/overheat....



--- In xl7@yahoogroups.com, "gonzinigonz" <gonzini@...> wrote:
>

> Ok ive had a look.
> Nothing that strange about it at all. Theres nothing ive seen on 
> powdec's web site thats close to this though.
> I've just sent them an email, see what comes back next week...
> There is something you can do Tony.
> If you can get hold of a multitester you can check some things.
> Set it on a suitable range to measure 12v DC VOLTS.
> Connect the black ( - , com) to one of the black wires.
> This is ground. You could also connect to some bare metal on the 
> casing, this is ground as well.
> Then meter the purple wire. You should see +10vdc on it with mains 
> connected.
> This is the wire that always supplies the board, regardless of the 
> power switch on the front panel.
> If you see 10vdc thats good :o)
> Now meter the green wire. This is the switching line. I measured 
> around  ~ 2vdc here when the unit was powered down (in standby)
> Then if you press the front power switch it drops to near 0vdc.
> (this is how the PSU switches on. If you ground this line it should 
> fire up)
> If this is happening and it stays low then meter the other cables.
> The voltages are screen printed to the side of the connector on the 
> PCB.
> So:- Pins 3,4,5,6,9,10 (7 & 8 being ground)
> 
> Pin 1        PWM on/off Active Low - Green 
> Pin 2        +10v Always on        - Purple
> Pin 3 & 4    +3.3v / 3A            - Orange
> Pin 5 & 6    +5v / 2A              - Red
> Pin 7 & 8    GND                   - Black
> Pin 9        -12v / 0.4A           - Blue
> Pin 10       +12v / 0.6A           - Yellow
> 
> Obviously be carefull while your doing all this. Dont let anything 
> short out or touch the metal case work by accident. 
> Let us know how you get on.
> Cheers
> Gonz
> 
> 
> Model No. CMG9-01
> 
> 100-240VAC 0.85A
> 
> H04615
> E158470
> 
> www.powdec.com
>