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You don't need a Manual. In 285 HV there is only one Power on/off switch. If that switch is on and batteries are new Alkaline (like duracell-no chepo )or fully charged and working rechargebles,and yet the ready light do not come the flash has defect inside.For sure.
There may be a short somewhere inside between the lead going to the pin and the one going to the camera body, such that when the capacitor has a full enough charge, the flash itself is firing (thinking that it has been triggered by the camera, just without the camera). Unscrew the foot - two small Philips screws, and check to see if any of the wires have damaged or melted insulation, and ensure they're not crossed. The ones to watch for primarily are the RED lead and the black lead. Repair any damaged insulation with electrical tape, and carefully reassemble and test.