Yamaha Equalizer 1027 service manual wanted

klomp1 · 29th December 2012, 09:50 AM

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.

Original Burnedfingers · 10:25 AM

http://www.loadoffun.net/loadoffun/L...amaha%20EQ.pdf

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.

klomp1 · 7th January 2013, 07:32 PM

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?

29th December 2012, 09:50 AM	#1
klomp1 diyAudio Member Join Date: Dec 2012	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.

29th December 2012, 10:14 AM	#2
Original Burnedfingers diyAudio Member Join Date: Nov 2002	http://www.loadoffun.net/loadoffun/L...amaha%20EQ.pdf 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. __________________ http://dynaco2forum.forumsmotion.com/ Last edited by Original Burnedfingers; 29th December 2012 at 10:25 AM.

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7th January 2013, 07:32 PM	#3
klomp1 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?