Help with Yamaha EMX88s mixer

[Ramirez]

Hello
I was using the mixer as a pa system and it just stopped putting out sound all lights turn on power meter lights etc I just cant get no sound at all out any suggestions

[mozwell]

There is a service manual for this on the web, try electrotanya
Do you get signal from MAIN OUT L & MAIN OUT R ?
Are the two speaker relays clicking in (approx 2.5 seconds after power on (RLY101 & RLY102) ?
Are you getting the +/- 15V rails & the +5V rail ?
Are you getting the main +/- rails to the power amp ?

Are you using the bridge speaker output, but have the output selector set to L/R

Check F102 & F103 fuses, from a quick look at the schematic, if F103 was blown the speaker relays would not turn on...

[Ramirez]

thanks mozwell I will look at the fuses and etc I will update you thanks for the info

[Jazz P Bass]

A very complicated unit.

If all of the led's (signal out strength) are operating, then you may have a power amp problem.

YAMAHA EMX68S EMX88S SM Service Manual free download, schematics, eeprom, repair info for electronics

[Ramirez]

hello Mozwell
fuses are good
I cannot hear or feel the relays clicking after power on I even put a stethoscope and still cant hear them click on power up can this this be the issue
again I hooked up a ipod to the 2TR input all meter lights move up and down showing its receiving sound but just cant get sound out to speaker

[Jazz P Bass]

If the relays do not click on, then the amp is in 'Protect' mode.

More then likely you have a power amp problem.

As I stated, these amps are not easy to work on, physically & circuit wise.

Do you have the equipment & the knowledge to work on something like this?

[Ramirez]

I have had a lot of people tell the same about it going into protect mode some even say the contacts in relay could have arced and contacts burned again I was not using the amp at the time it went off all I know is my son was using it with peavey PV215 speakers the system worked for about 4 hours then just the sound turned off but lights and levels all remained working

[Jazz P Bass]

It may be something easy like a high voltage power supply problem.

Nobody can tell you what is wrong without opening it up & doing a few basic tests.

[Ramirez]

yes so true there are no electronics store or repair shops here in my town the nearest electronics repair shop is like 1hour and a half away