NAD-T752-avr-cc4 电路图 维修手册.pdf

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1、 Service Information T752 Circuit Change PROBLEM: You may have a complaint that a low level white noise is coming from 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 are generating

2、 this noise. Additional filtering of the power supply on this board is required. 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 of

3、these capacitors can be in parallel with capacitors C628 and C634. The capacitor ideally should be surface mount type, however a ceramic disc or mylar type will also work. Contact: NAD Electronics International 633 Granite Court Pickering, ON Canada L1K 3K1 Voice: 905-831-0799 FAX 905-837-6357 03/28/03 RadioFans.CN 收音机爱 好者资料库