Lordsvale MVS Coin Mech help

Hi All,

I picked a Lordsvale up over the weekend and it now all fires up great.

Hopefully there is someone here with MVS experience

However I want to charge 20-30p per play (as an incentive to save change,) but the coin mech just rejects all coins, with a bit of google I have tried a couple bits of trouble shooting with the DIP switches but no luck.

Here are a couple of pictures of the mech and board;




It is a 4 slot board

All help is appreciated

Thanks in advance

 

If the coin mech isn't accepting coins at all, the first thing to check is that it's getting power - it looks like it should have 12V on pin 9 and GND on pin 10 with the signal common (probably 5V) on pin 1. It's hard to be sure though, since someone helpfully stuck tape over the section of the label with the pinout on it.

If it has power, it's possible the inhibit lines are asserted - again, working out which pins they are is hampered by the obscured label.

I've also got to say that the ULN2003 doesn't look that happy in the photo - it could just be an artifact, but it looks like the plastic is bubbled just over where the die would be.

 

https://dl.dropboxusercontent.com/u/28488139/Sentinel+Service+Manual+V0 (1).pdf

service manual for the coin mech

 

Cheers for the help, have a copy of the manual but nothing about the board is noted in there, I will do some probing when I get home and see what votages I get, for all I know it could be the way the DIP switches are alligned.

Will report back this evening. I may buy a replacement mech to double check it's not just the unit as I can pick one up locally for £15.

Thanks again

 

I work round the corner from CPC, so do you reckon for troubleshooting I could replace the ULN2003a with the following;

http://cpc.farnell.com/stmicroelectronics/uln2003a/darlington-array-7npn-2003-dip16/dp/SC08601

Or does the 99111 mean something,

Thanks

 

The 9911 is probably a date code - the ULN2003 is a pretty generic component and any should work.

 

Cheers bud, I did have a quick probe yesterday and I am sure I was getting 12v on the first two pins, I have got the voltage pin out at home managed to find a 30/35 mech that didn't have a ruined sticker.

 

Check the mech path isn't blocked. If there's a piece of paper jammed in it, for example, it won't accept coins.

Is the credit board definitely programmed for 20p? It's unlikely it wouldn't be as it's the only silver coin that wasn't redesigned in the Nineties, but still.

Some credit boards require +5 volts as well as +12 volts.

Do you have a manual for the cab? Does it mention the credit board? If not, you could always replace it with a Klingon or something.

 

That sounds worrying - that part of the label is legible, and it looks like that's the switch common - which would normally have 5V on it. Try unplugging the mech and reading the voltage on both sides of the 7805 regulator - although if that's gone bad it will have probably blown up the MCU on that sub-board.

 

voltage pinout is in the service manual

 

Yeah I saw thanks, I have the manual saved at home. Just had a picture on my phone at the time of the coin mech

 

Right, I have near enough 12V on most rails. That ULN2003a does have a slight buldge when you run your finger over it, could that be the issue ? Just I have no idea what that chip does.

I have taken the mech out and have given it a clean and can't see any blocks.

Thanks all

12v on each pin of the regulator, I think that it has taken then 16 Pin Logic chip out so I will replace those two tomorrow and update you.

 

Probably cheaper to just replace the credit board with another.

 

Just ordered two lots of the components from RS and CPC for a grand total of £1.77

Will replace them I will then look to replace the board, being my first cab I have no idea if there are compatibility / wiring issues with changing boards etc

 

Yeah, but is the ROM OK? If not, where are you going to get the code to program a new one? What caused the issue in the first place? Are you actually repairing the fault, or replacing a part that was blown due to the fault with another part that will blow? As machines aren't really supposed to be sold to the public with mechs, it could have been deliberately sabotaged.

If you don't want to accept my suggestion as a professional arcade repair technician (and the FACT that you can just change the credit board), fair enough! Good luck with the repair.

 

If you can point me in the direction of a credit board, I will happily buy one. I have had a look about and can't see one I don't know if I am using the wrong search terms. But I thought for the cost of a couple quid I would at least see if I could get the board going again.

I did come across that Klingon board but can't find any for sale that have them in stock

Cheers

 

Most people had some until recently... hmm. They come up on eBay every now and then. You could swap the whole mech, even.... but credit boards often have a sentinel connector. Try posting a WTB on Jamma+ or UKVAC. Maybe even NG if you want an original credit board.

You'd probably need to wire up a harness for these:
http://www.ebay.co.uk/itm/Mars-Elec...907236?hash=item3acd9fd524:g:-zcAAOSwbsBXkLMQ
http://www.ebay.co.uk/itm/Credit-board/282186692819?_trksid=p2047675.c100005.m1851&_trkparms=aid=222007&algo=SIC.MBE&ao=2&asc=39012&meid=5e449c6d7df140949d443cbe32639847&pid=100005&rk=1&rkt=10&sd=252557907236

The CCU may work here (or ask if they have a Lordsvale):
http://www.ebay.co.uk/itm/USED-WORKING-CREDIT-BOARDS-FOR-VIDEO-GAME-MACHINES/380359649134?_trksid=p2047675.c100005.m1851&_trkparms=aid=222007&algo=SIC.MBE&ao=2&asc=39012&meid=5e449c6d7df140949d443cbe32639847&pid=100005&rk=2&rkt=10&sd=252557907236

As for fixing it... I'd check the ROM as there seems to be a 12v short on the board - dump it if you can. Just be wary that it might not be a simple case of changing a chip... but you may get lucky

[EDIT]
Oh, cheap and cheerful - has Sentinel connector:

http://www.ebay.co.uk/itm/Quattro-c...967836?hash=item4d4baad1dc:g:-cwAAOSwmfhX3uZo

 

Cheers, so are CCUs universal ? Do you just have to make a harness if they don't have a specific connector for the coin mech (in this case the sentinel 30-35)

The only thing that I would need to work out is how to wire up the actual board to the existing connectors.

I have a pic programmer for when I was doing SNES mods I should be able to use that to try and dump it ?

Sorry about all the questions I am just learning as I go along Wish I had gone with electronics and not networking sometimes

Thanks for the help

 

They should work with most Mars and Sentinel mechs.

Basically, yes. So long as it's pin compatible.

No - a PIC programmer does PIC chips. You need an EPROM programmer.

Night/distance learning course. Networking pays better.

 

Sweet, will look tomorrow. I wish I got paid as well as some other network engineers I think they take advantage of my age when deciding my salary

Thanks for the help again