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Message: [QUOTE="richard7677, post: 207018, member: 3992"] OK, the PSU actually works, because when it is connected to the printer and I press the ON button, the PSU outputs 42V. Voltage vanished when I stop pressing the ON button. I've had the ON button pressed for more than 50 seconds and still no ON light. So, the problem must be outside of the PSU. And if that is the case, I really do not have much choice but to throw away my DX-5050. I checked wire continuity between PSU and the printer. All fuses OK. [/QUOTE]