This is the most likely situation here. Start by checking for 5 and negative 12 volts on the sound board. If this is good then you will need an oscope to test further.

Thanks. Looks like the ROM chips on mine are correct, there must be something bad on the sound board causing the speech to not work.

Or even bad/corrupt speach rom maybe?

Voltage is a bit high.

-12 = -16.5

+5 = 5.91

This pin is likely set on high tap. You need to change it back to 115 setting. Do this first thing before something blows.

The schematic is too low in resolution to see how things go exactly.
I do see there are muliple channels for different versions of sound.
Two FM channels (FM1 & FM2) for sound effects, background sound and two other channels for speech.
U18 is the speech chip (55516 (schematic) or 55536 (parts list)) which is obsolete.
With a little luck that chip isn't your problem.
What you can do is replace the C34 1uF capacitor.
If that doesn't work, replace the op-amp at U17 (MC1458).

Please let us know the outcome.

Peter
www.inkochnito.nl

Wow thanks Peter! Looks like Marco does have the CVSD in stock. But it’s pricey.

https://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=55536

Try the cap first, U17 second and U18 last.
I'll bet on U17 being bad.

Can anyone post a pic of a Diner aux power driver board? Or confirm that indeed the jumpers at w1, w3, w4 and w6 are in as the manual shows and no other jumpers are there? Having a problem and completely disgusted at this point. Had to walk away for a while.

OUT & IN directly...

my sister didnt like the PIN-BOT dropped to her house...
than i've found something else, more in his "miaouw" mood

20180830_212747 (resized).jpg

The High Speed that I recently put on route is locking up at least 10-20% of the games that get played on it. I played quite a lot before it went out and never locked up on me. The sounds are quite interesting though. Everything is very drawing out.

The first thing I found online was that a coil diode was likely bad, but wouldn’t that lock it up every game that it is fired? We saw no pattern and I went into coil test mode and had them cycle through several times without it locking up.

C34, U17, and U18 are blank on this board. I did completely re-cap the sound board. No change.

I should have looked better at the picture you posted, sorry.

There are two options which might be the problem.
The easy one to check is Q1 transistor.
The other one is a bad DAC at U1 (MC1408).

ok thanks. Q1 is fine.

TTL chips are rated for a maximum of 5.25 volts, you need to look at this NOW!.

I am pretty sure its not on high tap. What is the best way to verify?

(EDIT) all good. Bad meter.

False alarm on the voltage. I replaced my battery on my meter and it is exactly 5.0 volts.

Emergency averted, on to your regular scheduled programming!

OK, So I am still trying to fix the no speech issue on Millionaire. I have done the following so far: Completely recap the sound board. Replace the Q1 transistor. Replace U16 8 pin amplifier chip that ties to the CVSD chip. Still no sound. I would like to diagnose the problem better without shotgunning. I have a logic probe. Is there something I can test to pinpoint this issue?

Also, I socketed the U16 chip and I am starting to think it was a mistake since its an amplifier chip. Now I hear a bit more hissing / white noise with the game on. Thoughts on this?

Do we know that the speech eproms are any good yet?

Did you check U1?
Maybe you can see a signal on pin 4 of U1.
That is the output of the DAC.
The DAC is for all sound effects including speech.
Melody/music comes via the YM chip (FM1 & FM2).

Pin 4 of U1 has no output in “Sound Test” mode.

How do I verify that? The game plays music and has sound effects. The only thing (I think) I am missing is the speech. There are two EPROMs U4 and U19, both labeled “music/speech”

Well, best way is to take them out and verify in an eprom burner/programmer. But maybe someone else on here has some advice of anything you may be able to test in circuit?

I was just throwing ideas out.

U1 is dead.
MC1408 (digital to audio converter or DAC).

Music is playing, so U4 (sound program) if good.
Music instructions are getting though to the cpu and thus U19 should be good.
The DAC is the only thigh between the amplifier and the sound generator at U2.

This isn't it?

Sound Board HS.jpg

This resistor you mean is actualy a capacitor.
You can see it has 5 bands, as resistors have 4 bands.
The same goes for the "diode", which is also a capacitor.
It just looks different, different package.

Peter

Peter, I am pretty sure that U1 is the background music, not the speech. That’s why it wasn’t playing an output in sound test mode. It does in Music test. The DAC at U10 is looking like the likely culprit. Pin 9 is dead during sound test.

I’m in the club now. Picked this up a couple of weeks ago. It had a lot of problems with it. But all working and cleaned up now.

069D60E7-9F19-4AA7-B1C0-AB3FB832176C (resized).jpeg

Welcome! My High Speed was a complete basket case when I got it. It took a while to get it solid, but very satisfying when you get it there.

Having major issues with this board. For GRUMPY to have a look.

20180903_131656 (resized).jpg

20180903_131707 (resized).jpg

.

Is that a solder short I see by the first couple nasty pins on the left?

It wasn't originally but started to arc after chasing other problems. First it was arcing from one pin to the key pin and it melted the key right out.

Pins 7,8,9 and 10 are GI pins and still look fine. Pin 1 and pin 2 are 28 volt and 50 volt from the AC relay. Now the big question is what is connected to this on the insert board.

What exactly am I looking for?

1536029009842800019744 (resized).jpg

Also there are no wires at pins 1 or 2 on the connector even though that is where the spark was. The connector has taken damage from the arcing.

1536029261562-1456941265 (resized).jpg

Just started work on a MPU that has minimal burn probs and no acid damage....main problems appear to be from amateur hacks trying to solder (shorts, wrong components, insane crap like EVERY transistor removed and poorly re-installed?, odd crap).

I've got most of previous solder work repaired, need to still replace a few wrong/missing components....

Opinion question is...do you guys think I should replace the rest of the original IC sockets right off the bat, or give originals a shot with new chips first??

KIMG3209 (resized).jpg

If there is no corrosion, I would try keeping those original sockets in place. System 11 solder pads and wire traces are so fragile that replacing the sockets might create new problems.

I had ordered new sockets....but as I worked on the board, I started feeling more and more the exact same way.

I'm thinking I will leave them be.

Thanks!

Sign me up! (High Speed + Grand Lizard + Big Guns (system 11?))

Ok, been struggling with this for a few days now. I have 2 lamp rows that are out on Millioniare. I have replaced the transistor multiple times on row 7 (Q54) and it will work for a bit then fail. I also have replaced the pre driver the most recent time. Now I have row 1 out too. I am sure if I replace both of these transistors it will not solve it. What should I look at now?

(EDIT) Solved!

Now I just need to figure out the speech issue....

Are you sure the speech is made on the sound board and not the CPU board.

Try the original IC sockets first. If the game boots up with them, then they are good.

The speech is processed on the MPU board. I discovered this about a week ago in this journey. It goes from U21 to U9, then comes out pin 19 on the U9 chip. Pin 19 has no output right now. Then from U9 to U3.

Why would pin 19 on U9 have no output in sound test? If U3 is bad could that be the cause?

And my U3 doesn’t match the parts list (55536) or schematic (55516). I assume it’s an equivalent but can’t find that documented.

5A6FCA9A-3A96-4C32-96CB-B9F23C791F51 (resized).jpeg

Have you tested u-23 and u-24?

I put an equivalent RAM chip in U23 and repalced the U24 processor with a known good one from High Speed. My shotgun is almost out of bullets. Lol.