How do you use a Graco RTX 1500 paint sprayer?

Put pick up tube in material. Flip black plastic drain valve handle down to open position. Turn sprayer on and run until material flow from smaller prime hose. Turn off sprayer, set pressure with pressure control knob, clock for pres. up. Flip drain valve handle back up to closed position. Turn machine on, let it build pres until motor stops. Fire away. If paint flow suddenly stops at the gun, turn spray tip handle half turn count clock, trigger gun to clear tip clog, reverse back to spray position and continue.