New Life Games LLC
**Reel Slots** Gaming Machines => IGT S2000 and Vision Games => Topic started by: brettsrt on September 17, 2020, 04:48:12 PM
-
What are the physical differences between the 502 and 504 boards? can a 502 board be converted to a 504 board? The look very similar...
-
The short answer is no.
IGT relocated the traces on the board to eliminate the hum issue. They are different.
-
So the PCB is different basically
The short answer is no.
IGT relocated the traces on the board to eliminate the hum issue. They are different.
-
Correct
-
The early 50x boards had poor grounding for the audio section of the board. The 504b has a ground plain that actually ties into the board tray to fix the hum. I have seen 504a boards that have had the geounds reworked using wires under the board they don't name the hum perfect but they do help a lot. I have lost all pictures of how to do this modification tho i may have posted them on the old site but im not sure.
-
I have lost all pictures of how to do this modification tho i may have posted them on the old site but im not sure.
What was your user name on the old site? I might be able to find them.
I found it "vtyler" correct?
-
I have lost all pictures of how to do this modification tho i may have posted them on the old site but im not sure.
What was your user name on the old site? I might be able to find them.
I found it "vtyler" correct?
Yes im looking through one of my old backup drives also. I will also check my boards tomorrow when im back at my shop.
-
I just combed through the archive site and couldn't find anything. There is a LOT on the two boards though on both the current site and the archive site.
Hope you can find them. :propeller:
-
i found it but the file is too bit to upload here i will try cropping it and see if i can get the size down.
edit:ok i cropped the image down and i added color over the wires that intersect to better show wire paths.i have done the same mode to a few boards and it makes the hum a lot better. i have not looked into what exactly its doing.
edit2: looking at the schematic it looks like they are just reinforcing the power and ground connections. i wonder if we linked the gnd into the chassis like the 504b boards do if it would make it even better. i have some boards i need to repair maybe i will do this mode to one of them and try both.
-
Just pulled this out if a machine i have had in storage for a wile. I got the machine directly from the casino so i know the mod has to be atleast from a casino level now. I have done this mod to a number of boards after discovering it and it does help a good bit, but I would not consider it true 504 quality.
-
I've seen that mod :sherlock: with one of my 502's of the last bottom photo you posted.
Always wondered why it was there. :Scratch-Head:
I will see if I can find that MPU, and do some sound comparison tests against another UN-modded 502 and against a 504.
-
I've seen that mod :sherlock: with one of my 502's of the last bottom photo you posted.
Always wondered why it was there. :Scratch-Head:
I will see if I can find that MPU, and do some sound comparison tests against another UN-modded 502 and against a 504.
I actually think i have an un modded 502 a modded 502 and a legit 504 b now that I found this board.
-
Cool mod. Would this be a better choice than adding the resistors in line with the speakers?
-
Cool mod. Would this be a better choice than adding the resistors in line with the speakers?
Im personally not a fan of putting resistors on the speakers. I don’t actually see a big difference in the machines that have been brought in with them.
-
I think I might do this mod to my 504A board. Looks easy to do.
-
Going through a box of boards and I have one with the paper sticker on it too. Serial number starts with a D which is commonly found on 502 boards and 504s started with E.
-
Going through a box of boards and I have one with the paper sticker on it too. Serial number starts with a D which is commonly found on 502 boards and 504s started with E.
Actual 504b boards that have not been modified have a grounding pad around some of the mounting screws.
-
Here's a picture of a 504-B. Doesn't appear to be any mods.
-
Any idea on this one? It has white simm sockets that are often 502A boards.
-
Here's a picture of a 504-B. Doesn't appear to be any mods.
Did you look underneath Ken?
-
Here's a picture of a 504-B. Doesn't appear to be any mods.
It had the ground pads on the screws yes 504b
-
Any idea on this one? It has white simm sockets that are often 502A boards.
No ground pads around the screws not an original 504 i never go bu the simm sockets alone the early 504s had white sockets.
-
No. I'm lazy but I will check here in a bit.
-
Mark .. Doesn't seem to be any mods to the back of the board.
-
Here's a 504 B labeled from the factory without silver grounds on the board. It's a E beginning for the serial number. Has mods. I didn't take it off the board to check the other side for mods.
-
I noticed the mods around the reel chips and blue resistors on mine like in your 2nd photo.
Makes me thinks the static/humming interference comes into the audio from the reel section of the MPU and that's why they're re-routed?
Betcha it has something to do with the reel motor drivers causing it...I'm not sure.
-
I noticed the mods around the reel chips and blue resistors on mine like in your 2nd photo.
Makes me thinks the static/humming interference comes into the audio from the reel section of the MPU and that's why they're re-routed?
Betcha it has something to do with the reel motor drivers causing it...I'm not sure.
The reel motor bodge wires are not part of the 504 sound repair. Every 501 - 503 board i have ever seen has had them. The hum is because igt did not follow the data sheet for the on board amp and improperly grounded the chip. I used to have a sheet that said what all the bodge wires on the early 50x boards was for.
-
okay awesome Retro! :cool_thumb_up:
I always wondered what those reel mods were for....there are on a few of my 502's but not all and I don't really notice what they do.
May I should cut one and see what it does? :rotfl:
( Yup...I was THAT kid that likes to take stuff apart just to see what makes it tick! lol )
-
okay awesome Retro! :cool_thumb_up:
I always wondered what those reel mods were for....there are on a few of my 502's but not all and I don't really notice what they do.
May I should cut one and see what it does? :rotfl:
( Yup...I was THAT kid that likes to take stuff apart just to see what makes it tick! lol )
Thats actually the earliest mod for the 500 boards. The sheet doesn’t actually say what they are for just how to do the mods.
And being that kid is ok. I do all kinds of crazy mods to s2000s my main test machine boots off a sound simm just because i wanted to see if it could.
-
"Boots off a sound SIMM"...I agree that's just another media and I believe that IS possible.
Correct this statement a friend made to me and my response to him...was I wrong?...>>>
"The MPU computer processor would have to be told where to obtain the Boot sector from the BIOS's settings"
My response was...>>>
"Only after when the BIOS settings is flashed into the main RAM - which I believe is obtained from the paired GAME chips when the machine is powered up.
In other words, if the the processor doesn't see any data from the GAME chips, then it doesn't know what to do."
I know my response was wrong because I usually am...lol but still, your knowledge of how an MPU works is light years ahead of me and I truly envy that.
-
The sb is actually the lowest memory address. Everything including the simms shares the same 16bit data buss so all I really had to so was build a way to put the chip data on the simm then tie the simms read enable to the read enable for the eprom. Not something worth recreating but it was a cool little hack.
-
hi boys,
i search to identify my card i read post but i'm not sure!
can you help me
lokk my picture!
thanks
-
504B
-
ok really simple!!!
thanks!
-
ok thanks that i think, but i have a buzz yet when machine is on!
any ideas what's happenned?
i have s20000 tabasco with sound card!