Yamaha Equalizer 1027 service manual wanted - diyAudio
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Old 29th December 2012, 09:50 AM   #1
klomp1 is offline klomp1  Denmark
diyAudio Member
Join Date: Dec 2012
Default Yamaha Equalizer 1027 service manual wanted

Can anybody supply a service manual or schematic for this equalizer. I have searched the internet and found nothing. I need it for capacitor values and specs as these are work out.
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Old 29th December 2012, 10:14 AM   #2
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Join Date: Nov 2002

Here is a owners manual.

The cap values are marked on the caps. Check the power supply for correct voltages first. The Eq is only worth about $50 on ebay at best so its not worth a lot of trouble.

You might try Yamaha or see if there is a pro sound contractor in your area as this was a common low priced unit about 33 or so years ago and they should have a schematic. If not its still an easy fix without a schematic. Its an analog unit and not particularly good sounding either.

Last edited by Burnedfingers; 29th December 2012 at 10:25 AM.
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Old 7th January 2013, 07:32 PM   #3
klomp1 is offline klomp1  Denmark
diyAudio Member
Join Date: Dec 2012
Equalizers generates noise in loudspeakers when switched on. When they are switched off from the signal path noise disappears. i have tried both xlr and rca/jack with same result.
Occasionally one channel gives a thump. They are running at max output level on the front side knob.
Any ideas on what could generates this irritating noise?
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