IGT S+ Error Code "GRADR=???"

[Weissa1989]

Install the ram clear chip, install the board in the slot, start the slot, press the test button - nothing happens...

[jay]

Sounds like their might be an issue with the button.


Can you post a pic of the button your pushing.

[Weissa1989]

I have disassembled the button but on the cables I don't do anything.
Do you need more/other pictures?

[jay]

With the machine off - can you test the button with a meter to make sure its working ? Visually it looks to be in good shape.

[Weissa1989]

Electricity is not my favourite topic... :-(
I don't know what I have to do?


Disconnect the button and measure the plug ins with a meter?

[jay]

If the power is off - electricity is not a factor.


You set the meter on resistance (Ohms) and when you touch the two probes together you should see the needle swing. Untouch they swing back. Simple Open or closed.


Then you can touch the probes to the button (where the wires are) and press the button.
If the needle swings - button is good, if it doesn't -  button is bad.


If you were trying to get exact measurements of a component on the board you typically have to remove the component and test it independently to get an accurate reading. That is not necessary here as we are just seeing if the button works or not. Just make damm sure that the power is off before you do this.

[Weissa1989]

I will check on that. Hopefully only the button is demaged... :-)

[Weissa1989]

So i I have tried another button also without success...
I guess there is no power on the cables. Is that possible?


I have found another strange thing on the mpu.
I guess there are two chips missing. What do you guys think?

[jay]

Recap: forgetting the machine. If you set your meter to ohms and touch the probes together does the needle move ? It should. If it doesn’t Your meter is set wrong or needs a new battery and there is no point in continuing unless this test works.


Next: ensure the power is off on the slot machine !!!! Very important or you might wreck your meter.


Next: Touch the probes to the two spots where the button has wires. The meter should do nothing.


Finally: press the button. The meter should move just like the first step. If it doesn’t then the button is not working.

[Weissa1989]

Today I made those test according your instructions.
The meter does nothing... I tested it with other cables/plugs (to be sure that the meter is working and there is an electrical resistance (ohm)...


Do you have an other hint for me?

[jay]

Forgetting any other plugs, wires etc. If you set the meter to Ohms and just touch the two meter probes together does the meter move ?


If the answer to this is NO then the meter typically has a AA or AAA battery in the back, and it is either missing or dead.
If the meter is not working you cant use it to test anything.

[Stayouttadabunker]

Can you slowly remove/lift up on the Clear chip you installed?
Check to see if any of the contact legs are folded underneath the chip body.

Don't be afraid to admit you may have possibly installed the Clear chip incorrectly, if that may of happened.
I've done this many times accidentally and I've been working on S+ slots for many, many years.
Sometimes I even put the Clear chip in the wrong socket as well....things happen! haha
It's no biggie and nothing will happen to the clear chip....just re-install it into the correct socket making sure all of the legs are in each individual socket.
Then power up the machine and hit the test button for a second and a half.
The chip should begin it's clearing sequence.

[Weissa1989]

I put the probes of the meter together and the meter shows a reaction...

[jay]

If the probes together cause a reaction you should be able to use a short piece of wire between the probles and get the same reaction.....


The button should behave the same way. No reaction by touching the two wire points, but when you press the button the meter should react.