13 replies to this topic

[markjbevan]

Hi guys, I have a fruit machine that sometimes wont start and sometimes keeps resetting.  I've been told it is probably a power supply issue, so I'm looking to replace it with another.

It is an MPU4 power supply I need - does anyone have one they don't need that they would sell?

 

Many thanks,

 

Mark

[stanmarsh14]

K.... there are a number of MPU4 PSU's about (I can think of 4 at least), so will need you to put a pic up of your current PSU, so we can source the right one.

Also with MPU4 PSU's, they are generally easy to fix, in that it's normally only the large capacitors (Normally the main cause) or Bridge Rectifiers (Not that often these fail, but they can go) that tend to go on them, so it could be that we can help with the repair of your current one.

Link here with 3 of the 4 PSU's listed..... the one not shown, has an open top design when compared to the MPU-A version, and I am pretty sure the two are interchangeable... Certainly was on my old Action Note anyway.

Also note, that Swallow Amusements is operated by a fellow MPU Mecca member, called steveh, and is a top bloke.

http://www.swallowam.../-awp.htm#power

EDIT..... Just fount the open top version I was talking about earlier
 

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[markjbevan]

Hi Stan,

Thanks for this - I didn't realise there were so many!  To complicate things, mine looks different to the others too as mine does not have fuses on top - see attached.

 

I agree I would rather try and repair it than replace it, as they are heavy to post and there is a chance the new one could become damaged if it was banged around in transit.

 

I don't know much about electronics, but I had a problem on a pinball machine caused by low voltage, which was fixed by replacing a capacitor, so I suppose it could be a similar thing.

 

Sometimes it starts than resets either while playing or in attract mode, and sometimes it does not start - it just keeps resetting.

 

If someone could tell me what voltages I should expect in the pins, I have a multimeter and could check that, in case this helps identify the problem?

 

Also, if it looks like a capacitor is at fault, I could probably change it if I knew which one to get, as I have a soldering iron etc.

 

Again, thanks in advance, it is a lovely little machine and I can't wait to get it going reliably!

 

Cheers, Mark

 

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•  20140219_144113.jpg   111.51KB   1 downloads
•  20140219_144142.jpg   130.7KB   1 downloads

[richy1976]

I have a couple but not one like that, I have a yellow label (hopper support) but fuses are not in the same place.

[markjbevan]

Thanks Richie, thanks for looking - in the absence of a replacement hopefully I will be able to get the one I have fixed.

 

Does anyone know what voltages I would expect to see on each pin, and I'll check it with my meter.

 

Thanks again,

Mark

[richy1976]

On the mpu4 board there is a dial called reset sensitivity try turning that, remember where about it was in the first place though.

[markjbevan]

Hi Richy,

Thanks for that - I've had  few machines over the years and often noticed the reset sensitivity and never knew what it did.  Will try moving that and see what happens

 

Cheers, Mark

[stanmarsh14]

Just to add to Paul's post (Ello stranger, never knew you joined us over here)..... C3 is often replaced by a 25v cap of the same rating, certanaly in the more newer PSU's, but quite often, it's just the big two cap's (The 63v and the 25v ones), that need renewing, though whilst the PSU is open, pays to do all three.

Also you may find that some cap's have 4 pins not two (You will see on Paul's link, that his PSU has pin provision for the 4 pin version, but he's used the 2 pin types as replacements), but using the 2 pin version is fine, long as you have one pin connecting to +, and the other to - parts of the PCB, as on the 4 pin version, the extra two pins are only there to stabilise the mounting of the cap.

Managed to find the cap's you need here.....

http://www.ebay.co.u...=item43bf540fbe

http://www.ebay.co.u...=item20d081ab84

http://www.ebay.co.u...=item1c10fff7ad

[stanmarsh14]

Also just a note on your PSU..... It looks like it is a modified version of the image I put up earlier, but a small modification done to the top, to stop stuff from falling inside and shorting it out (Quite a few arcades used to do the same modification too), so it could very well be the same PSU.

[aaamusements]

It does sound like the PSU caps have dried out, but equally the fault could lie elsewhere.
 
Measuring voltages won't help really as this won't identify a bad capacitor, I'd just get on and change them.
 
Remember polarity is important and ensure you get the right size capacitors as they need to fit into the PSU PCB.
 
Get decent ones and remember the voltage can be higher than specified on the old caps. The capacitor will only charge to the input voltage. The uF rating must be the same.
 
http://booze.net/page7.html
 
Paul

Good to see you Paul, and I'm pleased to see your site is back up again.

[aaamusements]

Strange... someone else, Mavros I think it was, said my site was down. It's hosted with oneandone so should be up all the time.
 
Paul

Last time I looked it had been unavailable for months Paul?

[richy1976]

I clicked your link the other week launton has link on his posts & it didn't work then, its working now.