IGT Slot Machine Error 21

[CaliforniaDreamer]

Thanks so much for all of your responses.  I want to check out the wiring (not an easy task) before I do anything else.  The connector at the back of the unit where all of the orange wires go refuses to come out.  That actually may be the problem, corrosion.  I need to get a little more physical with it but don't want to brake anything.  I have some contact cleaner and will try that to see if it loosens.  Would not have looked at it without the suggestion of checking the wiring.  Thanks again.

[CaliforniaDreamer]

Thank you every one for all of your help, however I have decided to sell the machine as is with the 21 error.  I am tired of fooling with it.  I metered out the complete wiring from the connector on the compare unit the connector in the back of the machine and it was all good.

Woops sorry, should not have posted for sale , I have deleted that part of the post and created a post in the classifieds.
Thanks again for all your help.

[CaliforniaDreamer]

Thanks again for all you who replied and provided advice.  The machine has gone to another user and will have a good home.  The person who got the machine intends to fix it and from talking to him it seems he has the knowledge to do so.


Thanks
CaliforniaDreamer

[Stayouttadabunker]

You're very welcome...it was fun trying to get your machine running.It's NOT always easy....that's why I put some words down below here....lol

[Mr. Tibbs]

I recently fixed the error 21 on my S+ where only the B optic was working. The A optic was fixed by removing the Q4 transistor, and for the C optic I had to replace the IR LED emitter. If you replace any of the LEDs, be sure to solder the new one in the right way round, or none of the optics will work afterwards 

[Stayouttadabunker]

I recently fixed the error 21 on my S+ where only the B optic was working. The A optic was fixed by removing the Q4 transistor, and for the C optic I had to replace the IR LED emitter. If you replace any of the LEDs, be sure to solder the new one in the right way round, or none of the optics will work afterwards 

I agree with you in saying that LED optics are directional but I'm sure the new owner has all the extra parts to get it up and running again.

Your comment should help someone in the future! 

There's a few of us slot guys actually like messing around down to the IC component level or have the capability to do so.

Most home owners just shell out the Benjamins for replacement parts....lol