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If this is your first visit, be sure to check out the FAQ by clicking the link above. You will have to register before you can post or view most sections the forum. Click the register link above to proceed. Welcome to Neo-Geo. You can email neogeorot gmail. Remember Me? What's New? Page 1 of 2 1 2 Last Jump to page: Results 1 to 25 of Thread: HA sound amp - sound goes in, none comes out. Thread Tools Show Printable Version. HA sound amp - sound goes in, none comes out Currently trying to fix an old Capcom Section Z boardset - there's no sound.
Amp itself is fine as swapped it with a known good one. Can see sound going into it on pin 3 with a scope and hear the correct sounds playing using a crystal earpiece. Decided to swap out all the electrolytics in the sound section - still nothing. Next step is to swap out the ceramics I guess. Can't think what else to try if that fails, seeing as there are no schems for this boardset. Any ideas please anyone? Swap out all the caps.
I do hate the shotgun approach, but in cases like this I guess there's no choice. Have to order myself the right ceramics first though as I don't seem to have some of the values that the sound amp circuit is using. It looks like the sound output is from pins 7, Can you hook a speaker to 7 and 12 and get audio?
Can you verify that you are getting 12Volts to pin 10? Alternatively check the resistance between 7 and You should see the speakers resistance. If not this is a continuety issue, maybe a broken track somewhere. Originally Posted by NeoGeeO. Originally Posted by ttooddddyy. It is not the ceramics imho unless you have one short circuit the circuit will work without them.
Oh, well that's a pain. In that case I'm utterly stumped! And I have two Section Z's with exactly the same fault. If they both have the same fault then it's most likely a part that failed unless they both have the same corroded trace. If only I had some schematics Also check the pot to make sure it's still good. Sorry to say that was the first thing I checked on both boards and that's fine.
Also tried shorting out the wiper to the other legs and still no sound. Originally Posted by IronGiant. Last edited by ttooddddyy; at AM.
Nothing at all comes out, irrespective of the level going in. Even doing the old 'finger rub' test on the solder side of the board on all the components does nothing whatsoever, not even a very faint buzz.
Is the device getting warm Check none of the via holes are open circuit around that stage. A dc voltage measurement on each pin may help figure this out. No, doesn't seem toeven be slightly warm. This is a pain - I've fixed many boards in my time and this has been the worst in terms of some obscure sound fault. Are you SURE you replaced all the caps? Post a pic and show us which caps you replaced. How are you determining that there is no signal coming from the output of the IC chip? There's a DC component to the signal coming out from the IC.
Make sure your scope is set right to view or the trace will be off the screen. There's a big cap on the output of the IC chip that sits inline with the speaker.
Have you replaced it yet? It's the DC blocking cap that blocks that DC component from going to the speaker. Last edited by channelmaniac; at AM. Call me a cheap bastard I learned to fix things to save money Want me to repair your arcade game board? Look here. My repair logs are have moved to NewLifeGames. Originally Posted by channelmaniac. I'll give it another good seeing to You are operating that Ha without a heat-sink and its not even warm?
Mine get noticeably warm even after about a minute of use. Then again it is driving speakers. Did you check pin 10 to make sure its getting power? Was this board stereo or mono? From the datasheet - it looks like there are in-line caps used on pins 7,12 if this chip is used in a stereo and no caps if it is used in mono. Section Z boards don't use a heat sink for the amp. Yup, pin 10 is getting power.
It's mono. After looking more carefully at the pic you posted I realized you replaced caps that have nothing to do with the amplifier. Am I correct in thinking pins 7 and 12 of the amp go straight to pins b and 24 of the edge connector? Page 1 of 2 1 2 Last Jump to page:. Terraonion Tech Forum. Boot or No Boot. Contact Us Neo-Geo. All times are GMT The time now is AM. All rights reserved.
China ic ha13001
From this 20watts Integrated Amplifier project. Some people said that expensive and want the main amplifier only. I recommend the HA Audio car amplifier circuit project. And is the main amplifier only.
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