Audio bank DAB 7500N

Hi can anybody help me no audio and the regulated voltage is on the amp and all the rail voltages are there also. Any help will be appreciated thanks in advance. I do not own a scope as yet.
 

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Hi does anyone know anything im still struggling with this one. No audio and there is rail voltage +-15v and +-12v and the +-5v rails are there audio stops at the driver ic no switching is happening. Any ideas to try will be appreciated thanks