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(Topic ID: 112634)

CPU / SOUND PCB S.A.M. System - question


By fly

5 years ago



Topic Stats

  • 23 posts
  • 5 Pinsiders participating
  • Latest reply 5 years ago by fly
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zdjecie 2 (1).JPG
zdjecie 1 (1).JPG
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zdjecie (2).JPG
schm.pdf (PDF preview)
schemat.pdf (PDF preview)

#1 5 years ago

Hi
CPU / SOUND PCB S.A.M. System
What data are stored on the element U44 ?? (I.C.-SM TSOP S29GL256N11 256MB Flash) ??

schemat.pdf schm.pdf
#2 5 years ago

It's hard to say exactly, but flash memory is non-volatile memory. i.e. It survives across power cycles without the aid of a battery backup.

In general, it would be safe to say that game code is stored in the flash memory.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
ttp://www.PinWiki.com - The Place to go for Pinball Repair Info

#3 5 years ago

Yes, game code is stored at U44 and U45. U45 is populated on ACDC and possibly Metallica since the game code is so large on those games due to the number of full songs included.

#4 5 years ago

What to do if that part is damaged ??

#5 5 years ago

Send it to a competent repairman, or back to Stern.
The tech must be able to work on fine pitch surface mount parts.

What leads you to believe that the part is damaged?
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#6 5 years ago

Because someone did earlier repair,
Now the green wire in fell off and the machine does not respond

zdjecie (2).JPG zdjecie 2.JPG
#7 5 years ago

Hard to tell from the pics, but you might be able to reattach that if you have a very fine tip.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#8 5 years ago

cable is soldered, but unfortunately it did not work ((

#9 5 years ago

If I insert a new part of the U44, it will introduce the game code via USB (update from the website STERN) ??

#10 5 years ago

flip dip switch to number 8 and see if the game boots into update mode. When you switch it to 8 the game will boot from the eprom at U9 instead of U44

#11 5 years ago

I gave the PCB for a specialist to check,

#12 5 years ago

PCB have been back,
and now
when you turn on the machine is ok, but as I press START, the game does not move, there are only three clicks from the speakers and nothing.
as switching the switch 8, the display is dark (((

#13 5 years ago

and now it may be damaged U9 ???

#14 5 years ago

Is the game on free play?

When you change DIP switch 8 you have to then reboot the machine. Either with the white button on the CPU, or by turning it off and back on again.

#15 5 years ago

the game is not on the freeplay,
I changed DIP switch 8, turned on the pinball and the display is dark :/
buttons (start, select etc.) do not work

#16 5 years ago

if I could somehow download flash boot rom ??
I'd try even record a new rom on eprom

#17 5 years ago
Quoted from kbliznick:

Yes, game code is stored at U44 and U45. U45 is populated on ACDC and possibly Metallica since the game code is so large on those games due to the number of full songs included.

This is correct, the code is stored into U44 and U45
There are also some dynamic data (mainly lifetime audits).

Quoted from fly:

if I could somehow download flash boot rom ??
I'd try even record a new rom on eprom

U9 is the boot prom that holds the USB loader :
- When SW1-8 is ON, the game boots on U9 (and U44&U45 are only used to store a new firmware - no code is running from here)
- When SW1-8 is OFF, the game boots on U44&U45 (and U9 is not used at all)
As your game is still not working with the prom, that probably means that U44&U45 are not the issue.
Another component is involved.

What are the behaviour differences when SW1-8 is ON or OFF (reboot after you change it) ?
Is LED3 blinking (located 2 inches above the dip switches) ?
How is the watchdog LED on the IO board near the Reset indication (just under the 3 big capacitors) ?

#18 5 years ago

SW1-8off pinball starts up, I press the START button does not start playing, you hear three taps on the speakers a little to move the ship and so every few seconds.
SW1-N pinball starts up, the display is dark (lit only two pixels), the buttons do not work,
LED3 blinks
Led to the IO board, I do not remember exactly

I have a problem with the display, it works only halfway,
I do not know if it has something to do with it
https://pinside.com/pinball/forum/topic/potc-display#post-2092931
:/

#19 5 years ago
Quoted from oga83:

What are the behaviour differences when SW1-8 is ON or OFF (reboot after you change it) ?
Is LED3 blinking (located 2 inches above the dip switches) ?
How is the watchdog LED on the IO board near the Reset indication (just under the 3 big capacitors) ?

SW1-8 off LED3 blinkinng
SW1-8 on LED3 Light

Yellow LED IO board lights, after a while starts to blink and you hear three taps on the speakers,

#20 5 years ago
Quoted from fly:

SW1-8 off LED3 blinkinng

This means that some code code is running.

Quoted from fly:

SW1-8off pinball starts up, I press the START button does not start playing, you hear three taps on the speakers a little to move the ship and so every few seconds.

Quoted from fly:

Yellow LED IO board lights, after a while starts to blink and you hear three taps on the speakers

The IO watchdog is triggered and the pinball resets.
Check that your connection between the CPU and the IO board is correct (flat ribbon cable CPU-J9 / IO-J1).

Other than that, based on the green wires, it could be an issue with the NvRam (U11).
It's difficult to see on your photo, but it seems that the green wires are connected on the part that disables the NvRam chip select when there is no power (the wire on U44 is just a connection to the ground).
With a voltmeter, check that your have 4-5v on U11-30 when pin is on, and 0v otherwise (U11 is just at the right of the prom, pin #30 is the 3rd one from the top left corner near c89)
Also check that it's always powered (Pinball either on or off) : see the voltage on pin 32.
I'm not sure what happens when the NvRam not accessible but I guess it could lead to some kind of deadlock that would trigger the watchdog.

#21 5 years ago

I'll check the voltage, and let you know

zdjecie 1 (1).JPG
zdjecie 2 (1).JPG

#22 5 years ago

The green wire connected on Q10 and R66 is definitely what I said before (NvRam chip (un)select).

I can see there's also a capacitor that has been added on the bottom side of the pcb.
What was the original issue with your board ?

#23 5 years ago

Fixed !!!!!!!!!!!!!!!!!!
specialist who checked the PCB, solder the wire to the pins 32 and 33, and had to be soldered only to pin32

Still remained the only problem with the display, but that's another topic

Thank you very much for your help

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