[Boatanchors] Need help with HRO-500

[TVComlGuy at aol.com]

Good morning to the group,
 
I just acquired an HRO-500 and I need some help with the AC input  wiring.  
The previous owner had removed the AC cord socket and the wires  are 
loosely connected to a three terminal strip.  The wires are  Orange/Black, 
Red/Black, Yellow /Black, and one lavender colored small  wire.  The schematic 
doesn't show  a color code for the  transformer.  I need to know where these 
wires go.
 
73//Ron, KB0WAR