Marantz PM-4400, no output working?

Soldato
Joined
29 Dec 2004
Posts
17,109
Location
Shepley
A friend of mine asked me to take it a look at one of these amps which is turning on but there's no output to any speakers or even through the headphone socket, tried a variety of sources/cables but no luck so what's the next stage? Looks like a preamp problem.
 
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