Arcade Collecting > Pinball

Solenoids still fire incorrectly... *FIXED*

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Ken Layton:
I've seen broken connector pins inside the brown connector housings. Most of the time the broken pins were at the solenoid driver board end.

RichSorr:
I would check continuity with the pins not all the way on the connector. You would have to go from the solder side of the boards connectors. If it is all the original connectors it might be worth the time to just repin them, the pins are less than 10 cents each and its a simple task.

As for the MPU board being defective...never say never. I've worked as a tech in arcades for 8 years and there have been numerous  times where I've recieved bad parts direct from the manufacturers. BUT lets hope thats not the case and rule everything else out first.

gajaman:
Thanks guys, I'm going to check continuity tonight.

With the connectors, how are the wires attached, is a special crimping tool required?

ChadTower:

--- Quote from: gajaman on March 18, 2009, 04:41:33 am ---Thanks guys, I'm going to check continuity tonight.

With the connectors, how are the wires attached, is a special crimping tool required?

--- End quote ---


A $15 hand crimper will do the job just fine.  It takes a little practice but once you have it down it's not very difficult.  It is difficult without the crimper but if you're going to have pinball machines you need to know how to do this.

gajaman:
So, DMM in hand I set about the MPU and the SDB J4 connectors.

First I poked one end of the DMM in the J4 MPU connector where the wires go in and then checked continuity at the SDB J4 with the connector off the board, they all checked out.

Then I did the same but the other way round (SDB J4 attached and MPU J4 disconnected and they all check out as well.

So no breaks in wires.

As I was on my own to check that all of the pins were connecting on the headers I removed the SDB leaving just the J4 connected so I could get to the solders on the back of the board. I then poked one end of the DMM in the MPU J4 as above and checked continuity on the back of the SDB J4 solder joints, they all checked out.

About to give up I thought I should do the opposite for completeness, removing the MPU with just the J4 connected and checking continuity on the solder on the rear of the board. I got no continuity on pins 2 and 3!

Having looked more closely at the connector it looks like the end bit of the pin has snapped off leaving no contact with the header pin. I tried to bend the pins to get contact just to see if this made the solenoids fire correctly but I couldn't bend them the right way. Guess I need to order some pins!

The pins needed are tiny, I'm not sure if they are 0.62" or 0.93", I'm guessing 0.62" as there are larger connectors on other boards? Also, I guess they are female (assuming the headers are male). Is there anything else I need to specifiy to get the right pins? I'm trying to find somewhere in the UK so I can get them quickly, if I can't I guess I'll get some shipped from Marco's.

 

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