MF101 australia power help

[glitchkid]

hi guys,

hoping someone can help me out, i just recieved a new mf101 from the states that shipped with the incorrect power supply, stupidly i plugged it in being too keen to get it fired up, it powered on for around 30 seconds then it died, im really hoping it just fried the power supply and not the pedal, however after extensive searching on the net i cant find anywhere to purchase a correct australian power supply for this unit, i intend to use this on its own for processing synth sounds etc so i dont have any guitar pedal power supplies, i have one 9v DC 1A power supply here that i tried after it shut down with no response

i would like to try a proper adapter before i potentially shell out to try and get it repaired??

[Liquid Guy]

Hi, could you tell us what power supply was the wrong one (voltage and current rating)?
And the other 9V supply, is it positive tip as it should be for MF's?

[glitchkid]

hi,

so i ended up buying a correct (what i believe) psu from my local electronics store, 500ma 9v centre tip positive, however the unit lights up looking as if it is functioning but only a low hum noise emits from the unit, with a slight hint of source noise making it through, i emailed my local repair centre in australia, audio chocolate, and there response is that i fried my unit by turning it on breifly with the wrong psu and the repair costs would be more than a replacement, so its basically a glorified doorstop now? what a waste of money...lesson learned..

[latigid on]

Ditto; what was the incorrect PSU? Voltage, polarity, DC or AC?

Incorrect polarity should be okay (power diodes on every MF).
Up to 15V should be okay, but depends if AC was used.

If it was AC, you can get some rectification, meaning the DC voltage might be up to double the stated value.

[latigid on]

You can also open up the back and post a photo to show us if any components are obviously burned.

Audio Chocolate will have no sympathy for you as you bought outside of Oz. Still might work out cheaper than buying from them .

[glitchkid]

hey guys,

thanks for the responses here, the psu that i plugged it in with originally was the moog power supply it shipped with (the united states one 110v instead of the australian 240v) with a standard travel adapter. obviously my fault, but a little warning from the seller sure would of been nice since they are selling them internationally...

[latigid on]

Chalk it up to experience then .

The turns ratio in the transformer means the secondary output would be about double the rated voltage when plugged into aussie mains. And that's enough to fry some of the bits inside.

[glitchkid]

there is hope yet! recieved an email back from moog themselves as i emailed them after i was slightly unconfident in audio chocolates response, then the fact they ignored me when i asked for a recommendation of someone who would attempt to fix it...

"This is a bit of a situation as it wasn¹t purchased in Australia. However if you or anyone you know has some soldering skills I can help walk you through the process of replacing the IC yourself. It is SMD soldering, but would only take about 15-20 min. TC962COE is the correct IC, which can be bought here:

http://www.digikey.com/product-detail/e ... 62COE/TC96
2COE-ND/418719?WT.srch=1&gclid=CNaP9djL888CFdgMgQodltIEBg

Even this however might not fix your issue, depending on how long the wrong psu was connected to the pedal. This IC is the first line of ³defense² for over voltage and can cause the symptoms your pedal has.
Please let me know if there is anything else I can do for you."

[latigid on]

They're pretty kind with tech support enquiries. The charge pump was one of my guesses. Like they say, it's not a given that the damage will be limited there.

So, what next? Are you able to tackle the SMT? To get a IC off, you will need to cut every pin (can damage the PCB this way), use a hot air rework system, or get some specialised flux (e.g. ChipQuik). If you're unable, you might consider making friends at a local hackerspace.

[SouthPark]

My speculation guess is that the power supply is broken only. It is a guess only though.

The MF-102 requires +9 Volt DC.

I would just proceed to hop down to an electronic store (eg. Jaycar), and buy another power supply....... get a 240 Volt AC to +9 Volt DC power adapter. The power supply will need to be capable of handling 5 Watt of output power. This should not be a problem. Just make sure your new power supply can handle 5 Watt of power (or more), and all will be ok.

Your old (broken) power supply will at least have the DC plug that you can use. I would just get somebody to help you take the old plug and fit it to your new power supply.