IGT S2000 Super Spin Sizziling 7s Sound Problems

[gvt1911]

Have had this machine for a few years now and cannot figure out what is going on with the sound. First machine will play fine and sound is good, then I would get a loud static hiss noise for a about 10 -30 seconds. It would go away and sound fine in all 3 speakers. Well, one day the machine died and I had to replace motherboard. Got it from reliable source here and it was very clean with new battery. Varta battery removed, etc. Did clear chip thing and all was good for a year or so. Sound started up again (hiss noise) but was only about 5 seconds now. I changed out audio amp on top of machine with known good one and same thing. I purchased new simm card for machine and same thing. Now I have top left speaker with constant hiss sound and still have that loud static hiss noise come and go. Also when I hit the reel nudge and the #3 reel moves into postion for win, it does not make that "solenoid" click sound as the other 2 reels. I assume since I replaced about everything, there must be some other board that the sound goes thru. ALL speakers tested good. Any ideas??? 

[Tilt]

Did you replace the Multimedia Lite 2 (MML2) sound daughter board?  It sits on top of the MPU and the sound simm plugs into it.  There's some caps on them that go bad and will cause some loud pops, static, etc.

[gvt1911]

No , Should I seek out another board or should I recap the old board?  I rebuild audio boards in amps, so it should not be a problem... I thought it might have been a bad cap somewhere. 

[Tilt]

See the attached photo and schematics.  It's usually one of these four.  C57 & C59 can be removed.   They are used for the aux audio input which is unused, but will still cause noise problems if one is bad.  If that doesn't resolve it replace C33 or C34.  I think C59 and C33 are for the left channel and C57 and C34 are the right (but don't hold me to that).

Normally only one cap will be bad, but I always remove C57 & 59 first since they're optional.  If that doesn't resolve it, I use one of those caps to replace C33 or C34.  Probably should replace them with new, but it will get you up and going if you don't have any on hand.

[gvt1911]

Thank you...I will give it a go when I have time...

[gvt1911]

OK, I removed the caps as directed and got the sound back !!!!!! I did not have to swap out any caps, just removed C57 & C59...Everything seems to work OK, but I still have a HUMMM coming out of the top left speaker along with the sound... Is there any way to find out what the value is of these caps ? What gets me is that I replaced that board from a known dealer in 2015 and the label on the board stated it passed and is OK... Any way I thank you !!!
Now to find new ones to replace the other 2...

[Tilt]

They're 1uf 50v caps.  Some humm and hiss is normal if you have a 500/1/2 MPU board.  It's usually more pronounced with backlit reels too.  IGT made some design changes in the 504 Rev B boards that corrected the problem, so if you have one of those then you shouldn't have background humm and hiss.

[gvt1911]

I will check to see what board is in the unit and I will order the caps and replace for piece of mind...Thank you again for your help !!!

[Tilt]

It's probably a 502 rev A board they seem to be the most popular.  There's a mod some have done to help with the humming noise on those.  Putting a 1/2W resistor in series with the two top speakers will help reduce it.  If it's still too much for your liking you'll have to find a 504 rev b MPU board then.

Here's a link to one discussion about the resistors, there's more. Just search for resistor speakers and you'll get a bunch of returns.
http://newlifegames.com/nlg/index.php?topic=4374.msg23053#msg23053

[gvt1911]

I believe I have the 504 Rev B board.    I have full sound now out of the left top speaker where I only had noise and hiss before, so I am ahead of the game... I still have some background hiss out of the left top speaker, right top speaker is clean with no noise as is the bottom speaker. I am having a hard time finding these caps...I assume they are ceramic 1mfd / 50V but cannot find the correct "size" to fit the board. I found smaller ones. Would have to do some "creative" soldering. Should I also change out the 1K mfd /35V electrolytic cap also? Since I am so close to perfect. Here are some pics...

[mvco]

One quick idea, you can pick up a complete board on Ebay or the vendors here pretty cheaply.

[gvt1911]

Yes, If all else fails I will go there...
Thanks

[Tilt]

Try Digikey or Mouser for the correct size ceramic capacitor.  I've never had to replace the 1000uf except for ones with broken leads. 

I haven't ever seen a board labeled like that.

This is what I'm used to seeing. 

[gvt1911]

Ok,
More good news...I found my ORIGINAL MML2 board, removed caps C57 and C59, tested the 1000mfd cap ( GOOD) and put back into machine and it sounds fine...I still have a slight humm in the top left speaker, but now I can live with it...I need to lower the volume as now it is just a bit too loud... Thank you !!!!!!!!!!!!

[Stayouttadabunker]

I need to lower the volume as now it is just a bit too loud...

I had a spare light dimmer slider switch.
I attached it to the yellow wire on the tray speaker! Lol
Works great! 

[DB26]

I believe I have the 504 Rev B board.    I have full sound now out of the left top speaker where I only had noise and hiss before, so I am ahead of the game... I still have some background hiss out of the left top speaker, right top speaker is clean with no noise as is the bottom speaker. I am having a hard time finding these caps...I assume they are ceramic 1mfd / 50V but cannot find the correct "size" to fit the board. I found smaller ones. Would have to do some "creative" soldering.

I found these on mouser


https://www.mouser.com/ProductDetail/KEMET/C2220C105K5RACAUTO?qs=sSYV1F9c5cHrUbq0EfL5XQ%3D%3D


They seem to be just the right size to replace the old ceramic caps.