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Author Topic: v7000 No sound (3 machines)  (Read 1981 times)

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Offline 61Wally

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v7000 No sound (3 machines)
« on: July 08, 2022, 06:15:13 AM »
Looking through a bunch of past posts, I’m not seeing this issue. This upright is the 3rd board that has No sound. The other 2 were in slant tops and I gave up on them. I have replaced the speaker and Volume pots on All 3 with No luck. I can take a board out of working machine and the board works fine. I’ve even replaced the sound chip, with no luck at all. Does anyone know how/what I can do to repair this major problem. I have the knowledge now what to look for.
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Offline Badbaud

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Re: v7000 No sound (3 machines)
« Reply #1 on: July 08, 2022, 08:34:30 AM »
Usually the large capacitor near the amplifier chip goes bad. It passes audio info onto the speaker.
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Offline 61Wally

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Re: v7000 No sound (3 machines)
« Reply #2 on: July 08, 2022, 03:44:11 PM »
THANK YOU, I will check it and update this post. I replaced the YAMAHA sound chip and No luck, I will check the capacitor.
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Offline 61Wally

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Re: v7000 No sound (3 machines)
« Reply #3 on: July 08, 2022, 07:14:42 PM »
Do you happen to know which capacitor # it is?
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Offline Badbaud

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Re: v7000 No sound (3 machines)
« Reply #4 on: July 08, 2022, 07:35:09 PM »
A big one near the amplifier, usually 220uF to 470uF. I don't have a board layout in front of me.
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Re: v7000 No sound (3 machines)
« Reply #5 on: July 09, 2022, 12:42:50 AM »
Ok, I finally found my schematic to see which chip was the amplifier. You’re right 470mfd, Thank You for All your assistance.
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Offline 61Wally

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Re: v7000 No sound (3 machines)
« Reply #6 on: July 10, 2022, 03:42:20 AM »
“ THE CONCLUSION “ After reading and trying, I went old school with the function generator and found ALL 3 boards had bad “S2 dip switches”. Replaced and there’s SOUND. I want to Thank ALL of the input that was offered to me. As they say it never hurts to replace those old capacitor’s. 1 less problem down the road!!!
TAKE CARE ALL AT NLG, YOUR’RE FANTASTIC PEOPLE.
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Offline Sunrise Side

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Re: v7000 No sound (3 machines)
« Reply #7 on: July 10, 2022, 07:14:26 AM »
Thanks for posting the resolution of the problem.
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