Pioneer GM-X414

[dfwcomputer]

Hi,

i have a pioneer GM-X414 amp. it is 70w x 4.

it is about 4 years old and yesterday started to play up.it seems to have lost a channel.you can only get 2 speakers to work at any one time no matter what you do.it also seems to have lost power (e.g speakers just seem like there still through the head unit.) does anyone have suggestions or a service manual, or any info at all on these amps.

Thanks

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[dfwcomputer]

i have included a pic