Channel not

Hello, I recently was given a stereo system (Marantz) as a gesture of goodwill. I was pressured because of growing family to give my vintage stereo away some years ago. Dual turntable, advent pre-amp, Brysten amp, Dahlquist DQ-10's. The new stereo has a marantz stereo amplifier pm551. When I wired it all up the amp only plays one one channel. I put the speaker wires on A and A channel 1 and 2 they both play. My question to this group is should I have the amp fixed, or should I just seek out a new or used amp?
 
Are you using the top row "system 1" connections? Those are for the two speakers of a stereo pair. Don't use the bottom row.

Otherwise, do headphones work ok when plugged in? Are there both jumpers installed on the back?
Also check the balance control, which should be centered.
 
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