High Speed 1 sound/speech problem,please

arakisssun

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Puf,hello again.I cannot beleave that the game that I love so much have make me crazy with different problems.Now with speech/sound problem.I was not playing about 4-5days(I have it about 2 monhts and never have sound problems until now).Today I decide to make some games.So the problem that I discover is strange for me,and never meet it on my pinball repairs.Here is the video with sound problem:

http://www.youtube.com/watch?v=T5BzA_HYG48

Now the explanation.As you can hear,after turn on the pinball,the game begin fine,music is ok,everythings works fine until three red light is turn on.After this the ramp must be made it to call the policeman and hear the specific sound like police chase,but after making the ramp must be hear the sound from Police light-the police red ligh is spinning,but with no sound.I show and something strange-when I press the left or righ contact near the slighsnots-you can hear some not fully police speech(this is wrong,must be hear the highway sound).After Lock ball 1,must be hear police speech,but it's not,just slience.After Lock Ball 2 must be hear dispatcher speech,but it's not,only when I press left or right can hear some crazy police speech.Ok after all balls are down after multiball,and ball 2 is up,now the things begin crazy.You can hear only this stuck speech of policeman-no game music.After game ends,begin atract mode with no problem,but when I begin new game(the pinball is still on) there have no more game music,like first credit,only this crazy policeman speech.When I turn off the machine and turn it on,first credit begin good,untill тhe speech or sound efect of the Big Red police light must begin.Тhe sound/speach somehow stuck untill the machine is not turn off,and this is only begin after three lights is on and must begin multiball


The things that I do are:
1.Pull up and cleane all ROMs
2.Replace the PIA with new that is near to sound section of MPU board
3.Pull up and clean the CPU of sound board
4.Take out and push in all connectors from MPU board-I'm not touching the PSU or Flipper boards
5.Still not clean the CPUs of MPU board(I don't кnow is it necessary)

You are profesionalists here,and I'm really in nowhere with this problem,and really need your help.Will be pleased if you give me some direct of what I must to look or change



Thank you
 
Replace with new EPROM SPEECH U21 and U22,also and new B/G EPROM U4-no effect.Do you think that game roms are the problem,they left only to change.I don't think is some element because the problem appears in specific place-when must be made the ramp when red light is one and the police man talk.Really need help.
I think also that if the PIA is bad the problem must show up just in the begining of the game or something else,or I'm wrong?

I swap the two CPUs on MPU board,but no effect too
 
No,I don't but this will be the next thing that I will do.Now I will replace with new GAME ROM U27.After two days I'm waiting EPROM 2764 and will replace the U26.Мeanwhile,I will change all sockets on the Sound Board and MPU board.I can see that PIA U9 and P10 have been previously changed,because they are in socket.Of course I try with working PIAs and no effect.
How can this possible,about this problem,everything works fine before 4 days,now all goes to hell.
Every help will be in use.
 
Ok,I tried something interesting.I have PINBOT pinball that have the same MPU board.I just swap the roms from High Speed to Pinbot MPU board.Connect the Pinbot MPU with High speed roms to the High Speed pinball with its Sound board.The problem is gone.So I think now to concentrate on the MPU board of High Speed,not on the sound board because with the Pinbot MPU it works.
So a little bit direction of what I must to look of MPU board,obviously it's not the problem with the roms(but I will replace all the sockets of course).As you can see I make everything that I can do to fix the problem,please advice me
 
There is another CPU (6802) at U24 on the CPU board that controls the 2 sound ROMS on the CPU board as well. I would imagine either that processor or those ROMS if you haven't swapped those might be a cause of the problem. It could also be that little ribbon cable that connects the CPU to the sound board. However since it does work correctly when you swap CPU's then I think you are correct to suspect your problem is on the High Speed CPU.
 
Another more likely suspect now that I look at the schematic is the PIA at U10 on the MPU. That IC is responsible for the sound select outputs.
 
Thats it.I need to know which chip is responsible for this sounds selection.I will change the socket of the PIA and place new one for sure,and will trace it.Thank you for now.I hope to fix the problem soon,I like to hear the cops when pursue me:)
 
Repalce all sockets on MPU board-2 for CPUs and 4 for the Roms,no luck still the same result.I still did not replace the socket from the previuos owner,he was replace the two PIAs before.
I test the two CPUs and they work.Place new PIAs-no change.Do you think that can be some of the LS139 chips that corespondending with the PIAs.Do you think that can be faulty sram(I don't think is the ram because it must show some problem in the begining if it is,not in special moment in the game)
Still need help
 
It could be those chips you mention. How do you know if the sockets the previous owner put in are installed correctly. Did you check them with your Multimeter? You've eliminated virtually everything else except for the sockets, LS139s and the RAM. The RAM could have a bad "sector" in it that is only addressed when you reach that certain stage of game play with all of the sirens, police speech, etc going on.
 
The games works fine 2 months,thats why I think the problem is not in the sockets.This just heppen few days ago suddenly.Yes I trace every pin of the PIA's sockets to their first points.Could be the problem somethings else.I mean smoethnig around the game roms,it's not imposible.The problem accuarate when must be made something specify.But I think and other tnig:when begin new game the sound cyclic continue from the previous game,so the game roms begin from the begining of new game,but the sound not.What do you think?Very strange problem.I want to fix it.I have working MPU taht can I use,but I don't,because PINBOT will stay not working.I like two of them.
I appraise your help really.
 
Today I discover soemthing else.In the end of the last ball-the thirth(dafault 3 ball one game),when it drop in the hole not from the center but from the left or righ side,it must be hear sepcific sound like crash of the car.But when go trought,the sound just begin and suddenly off.In the begining of the next credit(new game) same sound cyclic.I begin to think that the problem is not in the speech element or speech decoder 55534 that secure the speech in the game.And the problem not show when must be begin the multiball,it can be see more earlier-in the end of tha last ball and crusshing sound that must be hear
 
If I need to replace the ram i begin to search and it's a little bit difficulty to find the sam ram:

2116 CMOS,16k,2kx8 Bit

but I find this,that must be analog:

6116-2 CMOS,16k,2kx8 Bit,200nS,24-DIP

Is it right?
 
Hey I fixed it.
I replace these three chips U7,U8(74LS139) and U6(74LS74),that corespondending with the PIA9,PIA10,U24(CPU 6802) and U23(Static RAM).I don't know which chip is,I just decide to change them at once,because they are in series,and the first after PIAs.
I discovered and one bad transistor Q14(TIP122),that is for the ramp gates.I replace it with new and replace the pre-driver Q10(4401) too.
I hate problems with PCBs,it keeps me going from the time that I have local arcade club with arcade cabinets.

Thank you to everyone that give me directions and helped me.I hope this fix will be in help for someone in the future
 
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