Scared Stiff booting problem

[Bazfish]

Hello and i hope everybody is doing ok in these troubling times.
With time now on my hands i have started work on my many games room related issues.. the first is my Scared Stiff. In brief.. with everything plugged in i get the AV board single tone and then no boot. LED501 is constantly flashing. If i remove EITHER of the CPU ribbon cables the game boots and plays but with no sound or DMD. All fuses have been checked, all voltages appear present and boards all inspected for damage / blown components as well as misplaced connectors etc. This was a fully working game but a few years dry storage have apparently not been kind

Im stumped so before i delve deeper can any of you fine people guide me down the correct path!

Help! I miss the mistresses dulcet tones!

Many thanks in advance.

Baz

 

[ColinD]

https://pinside.com/pinball/forum/topic/led-blinking-on-audiovideo-board-nbafb

 

[SUPERSPRINT]

Have you checked the batteries on the cpu. SUPERSPRINT2020-03-30 09:04:32

 

[Bazfish]

Thanks for the reply guys. Already been on Pinside Colin and saw that link.. very useful.

Battery's all checked but also removed.. no help there im afraid. Very strange one this.. looks like further investigation is required.. seams to be stumping everyone! Lol

 

[SUPERSPRINT]

You’ll need the batteries in. Not sure about wpc95 but gottlieb system 3 won’t boot without batteries. Have you pressed the cpu reset button? Chances are some components are out. Worth a recap on the psu board. Find the manual, they are excellent for troubleshooting.SUPERSPRINT2020-03-30 09:29:42

 

[Bazfish]

Indeed so It will boot without the batteries.. just a pain doing it blind without the DMD! Lol.
Batteries are back in now anyway. This problem is screaming out as a power problem but all tests check out ok thus far. I have the original manual to hand and it is indeed very good

 

[Alpha1]

I know those combind audio/visual boards do fail... Might be worth looking up what the symptoms are of a faulty one.

 

[Bazfish]

Found this group post from a wile back, describes my issue to a tea. Tried reseating everything including the ASIC with no luck. With one ribbon off the game plays perfectly just no sound or DMD! Go figure!

https://groups.google.com/forum/#!searchin/rec.games.pinball/nbafb$20viperrwk%7Csort:relevance/rec.games.pinball/pqMZG9dVUag/QdmFMa0OBgAJ

 

[Alpha1]

That says it's a CPU issue. Did you leave the batteries in the game? Or were they in that expansion board some WPC CPUs have?

 

[Bazfish]

It was only six months and the batteries were brand new. No signs of any corrosion or visual damage on any of the boards. Very strange

 

[Alpha1]

I think it's time for a CPU and/or AV board swap. I presume you haven't got others?

 

[Bazfish]

Unfortunately not.. it’s the newest game I have. Loads of everything else but no WPC 95 spares.

 

[Macro]

I suspected she's playing hard to get after being neglected for so long ...

 

[Bazfish]

Aint that the truth! Lol Any ideas sir?

 

[Macro]

Looking at the schematics, the bit that jumps out is the 'low voltage reset circuit' - can you see what this is kicking out 'cos if it's holding the line low then that would stop it booting.

 

[JESSYBR]

have you tried replacing the capaciters and bridge rectifiers???

common problem. my dracula had problems that looked almost the same as yours

good luck

 

[Bazfish]

Excellent leads gentlemen, will look at both when i next get the chance

Many thanks
Bazfish2020-04-02 09:41:47