See here (for example):
Big Guns - Williams System 11 - random lock ups
- Thread starter Andy B
- Start date
Thanks @Ruaraidh Yep I need a #A-10821 by the looks of it as in your picture, just did an order on Monday from Marco too 
. Do you have one could buy of you by any chance with the screws or do you know the screw type ?
www.marcospecialties.com
. Do you have one could buy of you by any chance with the screws or do you know the screw type ?A-10821 - Flipper coil stop for 1987 Williams F-14 TOMCAT, SPACE STATION, FIRE!, BIG...
<p> Flipper coil stop for 1987 Williams and other pinball machines. Core height from bracket face is 6.3 mm. </p> <p> Overall length of bracket is 1-1/4in, overall width of bracket is 1-7/16in, overall depth of bracket is 3/4in, distance from screw hole to hole measures 7/8in, and core length...
www.marcospecialties.com
OP
OP
Yes. Tried that Phil. The black marks on the connectors were already there so not my doing. Same result I’m afraid - issue never went away despite board being disconnected.
OP
OP
I might have one Phil though not sure if it was WMS or Data East - will have a look later today.Thanks @Ruaraidh Yep I need a #A-10821 by the looks of it as in your picture, just did an order on Monday from Marco too
A-10821 - Flipper coil stop for 1987 Williams F-14 TOMCAT, SPACE STATION, FIRE!, BIG...
<p> Flipper coil stop for 1987 Williams and other pinball machines. Core height from bracket face is 6.3 mm. </p> <p> Overall length of bracket is 1-1/4in, overall width of bracket is 1-7/16in, overall depth of bracket is 3/4in, distance from screw hole to hole measures 7/8in, and core length...
OP
OP
Also, I see in a previous post in the thread I note that I replaced all flipper coil diodes. I can’t believe I would have missed that end stop being missing - even my eyesight is not that bad!
OP
OP
I was right, I do have an end stop in my toolbox Phil. I think it’s Stern as there’s a brand new Stern coil in the box with it (Lord knows where I picked them up from!) but looks like the one in the earlier photo.
I’ll stick it in the post for you today.
Attachments
Does anyone know or had experience of the System 11 6802/08 CPUs crashing after the machine has been on for a while or maybe the Ram chips. I would of thought Ram failure would be more possible.
I can`t get my head around that sometimes the displays garble then clear on the next game as though the data in the Ram is being corrupted then cleared for a new game if this is how it works, the NVram does lose the settings sometimes.
The CPUs came from the old acid damaged board of course.
I am trying to carry on from @Andy B but im find I am going over what has already been checked.
I have my High Speed but I not keen on putting the Rotten Dog in there to test
The only option I can see is to get a MPU from @dumbass on Pinside he sells new built replacements but they are $600
I can`t get my head around that sometimes the displays garble then clear on the next game as though the data in the Ram is being corrupted then cleared for a new game if this is how it works, the NVram does lose the settings sometimes.
The CPUs came from the old acid damaged board of course.
I am trying to carry on from @Andy B but im find I am going over what has already been checked.
I have my High Speed but I not keen on putting the Rotten Dog in there to test
The only option I can see is to get a MPU from @dumbass on Pinside he sells new built replacements but they are $600
Last edited:
His boards are top notch though... Just get a board, order the parts and build it yourselfDoes anyone know or had experience of the System 11 6802/08 CPUs crashing after the machine has been on for a while or maybe the Ram chips. I would of thought Ram failure would be more possible.
I can`t get my head around that sometimes the displays garble then clear on the next game as though the data in the Ram is being corrupted then cleared for a new game if this is how it works, the NVram does lose the settings sometimes.
The CPUs came from the old acid damaged board of course.
I am trying to carry on from @Andy B but im find I am going over what has already been checked.
I have my High Speed but I not keen on putting the Rotten Dog in there to test
The only option I can see it to get a MPU from @dumbass on Pinside he sells new new built replacements but they are $600
My thoughts are that this is a faulty rottendog mpu board. only way you will know if by swapping it out for a different mpu.
Yep @Andy B had already fitted it along with a RD PSU. I believe the only items you add is the ROMS & The CPUs.
His boards are top notch though... Just get a board, order the parts and build it yourself
Yep I think I might go along with that and order 1 in the meantime, the board is $100 I'm not afraid of building it as long as the parts are obtainable in the UK easily enough. I'm thinking I could try some different CPUs and NVRAM in the RD as I could use the NVRam at least on one of my other pins.
The CPUs look cheap enough
MC6808P Integrated Circuit - CASE: DIP40 MAKE: Motorola | eBay
Find many great new & used options and get the best deals for MC6808P Integrated Circuit - CASE: DIP40 MAKE: Motorola at the best online prices at eBay! Free delivery for many products.
www.ebay.co.uk
OP
OP
I didnt swap any chips over from old board in to new one Phil. Paid extra for the board with new processor and roms included.
Attachments
Thanks @Andy B that saves me messing with those . Did you ever ask the Pinball Palace for any help/info though its not like a normal purchase of course where you would expect support.
w8 and w9 is a head scratcher seems to be to select system 9 or 11 but every board I have seen images has 2 resistors with 1 to remove.
. Did you ever ask the Pinball Palace for any help/info though its not like a normal purchase of course where you would expect support.w8 and w9 is a head scratcher seems to be to select system 9 or 11 but every board I have seen images has 2 resistors with 1 to remove.
Last edited:
OP
OP
No, I didn’t contact Sean other than to return the Banzai Run roms he had installed in the board by mistake when I got itThanks @Andy B that saves me messing with those
w8 and w9 is a head scratcher seems to be to select system 9 or 11 but every board I have seen images has 2 resistors with 1 to remove.
I'd take the rottondog board out and give it a really good inspection. If nothing obvious, send it off to someone for a professional diagnosis and repair.
