NAD-T752-avr-si5(1) 维修电路原理图.pdf
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NAD-T752-avr-si5(1) 维修电路原理图.pdf
Service Information T752Circuit ChangePROBLEM: You may have a complaint that a low level white noise is comingfrom one or all channels during the first few minutes after turn on, then the noise will fade away.CAUSE: On the pre-amplifier/main in pcb, the volume I.C.s U602 and U603 aregenerating this noise. Additional filtering of the power supply on this board isrequired.SOLUTION: Add bypass capacitors to the +-12v power supply rails.Locate the pre-amp out/main in pcb. Install a 0.1uF 25v or higher voltage,bypass capacitor on each rail of the +-12v power supply line. The placement ofthese capacitors can be in parallel with capacitors C628 and C634. The capacitorideally should be surface mount type, however a ceramic disc or mylar type willalso work.Contact:NAD Electronics International633 Granite CourtPickering, ON Canada L1K 3K1Voice: 905-831-0799 FAX 905-837-6357 03/28/03RadioFans.CN 收音机爱 好者资料库
