NAD-T753-avr-tb6 维修电路原理图.pdf

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1、Page 1 of 2 Technical Bulletin T753 A/V Products Hardware Technical Bulletin: H2004-01 Date: January 19/04 Subject: Pre Amp PCB NOTE : N/A Complete Previous T.B.s for this model : YES NO Following T.B. H2004- DESCRIPTION: Some units may have higher than average residual noise level on centre (and so

2、metimes) surround channels. REASON: +5v regulator noise is leaking into the audio path which will vary on the type of regulator used. SOLUTION: Install a 1uF 25v capacitor between the +5v rail and ground. Removal of the preamp pcb is not required. Locate the centre of the preamp pcb and remove the c

3、oating on the ground pad as shown in photo 1. Install the 1uF 25v capacitor as shown in photo 2 . When installed the capacitors negative terminal should be facing the main pcb. See photo 3. Photo 1 RadioFans.CN 收音机爱 好者资料库Page 2 of 2 Service Information T753 Circuit Change Photo 2 Photo 3 Contact: NAD Electronics International 633 Granite Court Pickering, ON Canada L1K 3K1 Voice: 905-831-0799 FAX 905-837-6357 3/12/04 RadioFans.CN 收音机爱 好者资料库