Changed the SS Reel chip and now it wont work

[Scrubby]

I swapped out my SS6251 reel chip with a SS7812 and now when I turn it on the bill validator boots up but nothing else happens. The florescent tubes light up but the reels dont spin and no lights on the display or buttons. What could be wrong? I was told I could swap out the reel chips without having to do anything else. I haven't tried putting the old chip back in yet to see if it works like it did before. Any suggestions would be helpful. I have an IGT S+ 5 Times Pay 2cm with a SP731 game chip & 10mhz board.

[Stayouttadabunker]

Kinda nice you went from an 85% chip to a 96% reel chip! 
Whichever casino that machine came from shows you how greedy they were! 

Make sure the new reel chip is the right position and orientation.
The labeling could be backwards.
At the end of the chip device is a small notch.
If there's no notch, then there would be a small indented circle and it might just be under the new label.
Once you've found the notch or indent, look on the MPU circuit board.
There will be a notch imprinted onto the board itself in white at one end of the chip socket.

Another thing is this, slowly remove the chip you installed.
Are there any folded-under pin legs?

Lastly, I don't know where you got the chip from.
Is it OEM original or a copy?
Either way, it may be corrupted or shocked from static electricity due to poor handling.
Since you did not put up a photograph of this chip you installed, we don't know if in fact there is a label covering the UV glass.
Also, some chips don't even have a UV glass.
The new chip may also be a different sized device where you would have to change the socket jumper.
SO many things could have went wrong, you could have even bent an MPU pin during re-installation.
No lights on the display could mean a panel fuse burned out too.
The reels won't spin even though everything else lights up until you do the correct procedure to get past code [61]
These are only a few of the things that I can think of offhand.


Remember, the more you can tell/show us, the better we can help you. 

[Scrubby]

 I checked for proper orientation and for folding pins; all seem fine. I put my original chip back in and the machine works fine. I put the new one in again;the same old problem. The reel chip I got looks like an original as it says 1992 IGT so it doesn’t look like a knock off copy but who knows. I’ll see if the guy I bought it off of online will send me another one as this one definitely has something wrong with it. Unfortunately when I took out my original chip to try the other one again I broke off 2 little end pins. Do you think I could re-solder them on carefully without damaging the chip? I’m sure if I don’t have those skinny little pins sticking down in to the socket it probably won’t make contact.

[Stayouttadabunker]

Unfortunately when I took out my original chip to try the other one again I broke off 2 little end pins. Do you think I could re-solder them on carefully without damaging the chip? I’m sure if I don’t have those skinny little pins sticking down in to the socket it probably won’t make contact.

Yes...but use a heat-sink behind the breaks next to the chip body or the insides will be toast.

[jay]

It is also possible that the chip your using is for a 16mhz board or vice versa.
Do you have a manual volume control (10mhz)...... or not (16mhz).

[knagl]

For kicks you could try changing the jumper by the chip socket on the off chance the chip is a different size. Doubtful, but not much to lose. Just put the jumper back if that doesn't do it.

[Scrubby]

Well I was able to solder the pins on without too much trouble. After reinstalling it worked but the volume was barely audible. I thought maybe the pins weren’t making good contact so I rechecked them and they were okay. I then realized that maybe the volume control on the board may have gotten turned by accident when working on it. I really didn’t think so but had to try it. Turned it a little and voila! Got the volume back to where it was so all is back to normal. I contacted the guy I got the chip from and he will send me another one. Hopefully the next one will work. Thanks for everyone’s input.

[Stayouttadabunker]

Okay , without really answering Jay's question, we know that you have a 10MHz MP board.
The 16MHz MPU's don't have the blue volume potentiometer dial.

Do you think you could give us the numbers printed on the new chip?
Under the label on the body itself?

[Scrubby]

I don’t want to remove the label to see if there’s a number cause I may have to return it to the guy. I’m hoping that I just got a bad one.