Pioneer gm-3000, how to make it sound?

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Hi guys i get for free an old pioneer gm-3000, i managed to start it up by reading another thread on this forum, after the amp starts he dont make any sound on any channel, i try both connecting ground to the correct pin on the input or to the power supply one(im testing it at home with a computer power supply), what i have to do to make it sound?

Greetings from italy 🙂

p.s. sorry for my bad english if someone dont understand something or i forgot some info's just reply and ask 😉
 
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little up, i tried making it work in 2 channel mode but nothing, really cant get out sound of it... but i have a doubt, as source im using my old nokia 5800, i read on web that the minimum input signal power of this amp is 70mv, do the nokia audio output produce that power? is that the problem?
 
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