LM324N replacement?

[spisi]

Thanks guys, I'll check the voltage. I was set on freeplay when I got the machine, maybe it reverted back while I was messing around? Any ideas as to why the "error" message is gone? Could the Pokey be bad even without the "error" message?

 

[wugly]

all your messing around could have pulled a speaker wire. may have taken out the amp chip on ar board. may have nailed volume control next to test switch in cabinet. So many options

 

[spisi]

NO. there is a latch at m10 that controls them. this latch grounds one side of the leds while the other side is connected to 5v . test the pins that control the leds in the schematic and or check the 5v on your harness that feeds the leds

I'm getting the buttons to light up steady in test mode so they must be getting 5V

 

[ArcadeTechGW]

Oh boy....I'm learning....what did I do??? Did I blow something up? No beep in test mode. The "error" message is still gone though. Asteroids are back to normal. No sound at all. Start buttons not blinking, but are lit solidly in test mode.

Edit: Reseated it one more time, nothing changed.

If you put your POKEY in backwards, yes, you probably wrecked it. I have some in stock.

Want to buy one? DM me.

 

[andrewb]

Thanks guys, I'll check the voltage. I was set on freeplay when I got the machine, maybe it reverted back while I was messing around? Any ideas as to why the "error" message is gone? Could the Pokey be bad even without the "error" message?

I believe the ERROR message results when the CPU detects the random number generator in the Pokey as being bad. So that part has to be working to make the ERROR error go away.

However Pokeys are multifunction chips, that house a collection of different functions (data inputs, as well as sound outputs.) And it is possible for some of those things to be broken in ways that the CPU cannot detect.

This is why it's important to always have at least one spare Pokey on hand, for test purposes, when you think you have problems. As sometimes the only way to be sure is to swap the chip with a known-good one. (And ideally also put the suspected bad chip in a known-good game board of the same game.)

If the problem follows the chip to the known-good board, and the known-good chip fixes the problem in the suspect board, you can be 100% sure the chip is the root cause of the fault.

 

[spisi]

I believe the ERROR message results when the CPU detects the random number generator in the Pokey as being bad. So that part has to be working to make the ERROR error go away.

However Pokeys are multifunction chips, that house a collection of different functions (data inputs, as well as sound outputs.) And it is possible for some of those things to be broken in ways that the CPU cannot detect.

This is why it's important to always have at least one spare Pokey on hand, for test purposes, when you think you have problems. As sometimes the only way to be sure is to swap the chip with a known-good one. (And ideally also put the suspected bad chip in a known-good game board of the same game.)

If the problem follows the chip to the known-good board, and the known-good chip fixes the problem in the suspect board, you can be 100% sure the chip is the root cause of the fault.

Thanks Andrew. Funny thing was, the whole thing started with a loud staticky buzzing noise, everything else was working, including the sounds and number generator. The "error" message was there at that time.

 

[spisi]

Note that the start buttons only blink when it's in freeplay (or it's coined up, if not in freeplay).

Try coining it up.

Also, original Pokeys are fine. I've been using them on boards I refurb and repair for folks for years with no problems. The PokeyONE is fine too, they did a great job on it. But some folks prefer original.

Tried coining up, and boom, buttons are blinking! Another gold star for andrewb!!! So, I'm feeling a little better, starting to think my Pokey is working, but still have no sound at all. Possibly it is just the LM324N chip. I'll replace that first and see what happens.

 

[wugly]

try to remember doing eight things at once is very bad. the reason why it is so bad is that you can create multiple problems at the same time and now you made it 100 times harder to solve the problem. second of all with multiple things happening it is easier to plug things in backwards. and yes I have plugged an eprom in backwards when I should have called it quits because it was so late. fixing anything fast is the slowest way to fix things. and yes you can get lucky sometimes but usually not

 

[andrewb]

try to remember doing eight things at once is very bad. the reason why it is so bad is that you can create multiple problems at the same time and now you made it 100 times harder to solve the problem. second of all with multiple things happening it is easier to plug things in backwards. and yes I have plugged an eprom in backwards when I should have called it quits because it was so late. fixing anything fast is the slowest way to fix things. and yes you can get lucky sometimes but usually not

Very wise advice.

 

[spisi]

I know, I know...I'm so anxious and excited to get her up and running, even have a buddy of mine doing me a solid by driving 6 hours to pick up the cardboard bezel that goes behind the mirror. It's like I'm an addict!

 

[spisi]

Oh My God......so, since I was having no sound at all, I thought hey let's check the speaker, I pulled out the wood marquee tray only to find the molex that I had unplugged a day earlier......plugged her back in and all is good, even the static is gone! The Pokey survived going in backwards to boot!!! I consider myself super lucky on this one, I'll try to slow down boys.

 

[andrewb]

Oh My God......so, since I was having no sound at all, I thought hey let's check the speaker, I pulled out the wood marquee tray only to find the molex that I had unplugged a day earlier......plugged her back in and all is good, even the static is gone! The Pokey survived going in backwards to boot!!! I consider myself super lucky on this one, I'll try to slow down boys.

Lesson learned: Slow down and check the simple stuff first.

Also, spend more time searching, and less timing messing with things in your cab. Here's a list of hits to posts I've made that explain the simple way to test your speaker, wiring, and volume pot, with one simple DMM measurement:

Search results for query: speaker wiring 50 ohm*

forums.arcade-museum.com

 

[rod90]

I guess that you are the "Red guy" getting punched in the nuts? Remember, speed kills.

 

[spisi]

Lesson learned: Slow down and check the simple stuff first.

Also, spend more time searching, and less timing messing with things in your cab. Here's a list of hits to posts I've made that explain the simple way to test your speaker, wiring, and volume pot, with one simple DMM measurement:

Search results for query: speaker wiring 50 ohm*

forums.arcade-museum.com

Thanks for your help and advice!

 

[wugly]

regarding your sound problem in message 22 I said check your wires. a big part of this hobby is enjoying working on these machines (I love solving the problem), if its just playing you will burn out soon. your speed introduced a problem that did not exist that almost caused an expensive pokey problem

 

[spisi]

regarding your sound problem in message 22 I said check your wires. a big part of this hobby is enjoying working on these machines (I love solving the problem), if its just playing you will burn out soon. your speed introduced a problem that did not exist that almost caused an expensive pokey problem

Yes sir, you are 100% correct! I forgot to check them, wish I didn't, damn. Thanks man for all your help and patience!

 

[VectorCollector]

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