Author Topic: Williams SPEECH board repair tip system 6-11  (Read 916 times)

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Offline 48

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Williams SPEECH board repair tip system 6-11
« on: September 08, 2010, 05:27:29 PM »
As everyone is probably aware now I have been having a heap of trouble with system 9 sound.Finally got sound on a machine, without the speech board (jumpered W1 W2).

Then plugged the speech board back in, sound no speech, gaps in sound where speech should be.
Other symptom, whenever the speech board is plugged in, sound is at a very low volume.
Also a fair bit of static, like a crook pot.

Did the usual, elect caps, checked other caps and resistors. Tested eproms so I knew they were OK. Ribbon connecting cable tested fine. So did the pot.

Read a heap on the net. Found a few bits and pieces pointing me in the right direction, but essentially there is no real info out there for the speech board.

Finally decided to replace IC2. Even though symptoms pointed to it being OK.
New socket and the IC's are readily available at Jaycar.
Now finally had speech, @@* but volume was still extremely low.

Thought about it for a while and figured if IC3 also an op-amp then perhaps it is faulty too.
Changed it and Bingo full volume.
Hopefully this will help someone out sometime,why both items chose to go at once is anyones guess,but apparently it is not normal, and gives different symptoms to either one of them failing independently.





 
Lets go Brandon!

Offline goodolddays

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Re: Williams SPEECH board repair tip system 6-11
« Reply #1 on: September 08, 2010, 10:47:03 PM »
Great tip and glad you have it sorted  ^^^
I need more room ! and more $$$

Offline TUF-427

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Re: Williams SPEECH board repair tip system 6-11
« Reply #2 on: May 04, 2011, 09:08:12 PM »
I had an issue with my FP where the speech board would kill the sound board completely,

sound board would work ok by itself if jumpered, remove jumper and plug in speech board nothing but silence.

I decided to remove all the speech roms and plug the bare speech board back in to see if sound worked,

it did.

Turned out Ic7 rom was bad and killed the sound completely,must have been corrupting the data

got a new set of speech roms burnt all good...

Had also replaced all the sockets etc for good measure...

Firepower, F14 Tomcat, Terminator2, Twilight Zone, No Fear, TAF, Hyperball, Sttng....

Offline Strangeways

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Re: Williams SPEECH board repair tip system 6-11
« Reply #3 on: May 05, 2011, 10:33:29 AM »

Some great tips in their for future reference. Well done guys !
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Marty Machine

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Re: Williams SPEECH board repair tip system 6-11
« Reply #4 on: June 08, 2011, 12:40:50 AM »
I have a golden rule about fault-finding with chips (or any parts really)

"when in doubt, pull it out" (and the component too hehehehehe)

Gotta be worth a try ;-)
MM.