NAD-T753-avr-tb6 维修电路原理图.pdf
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NAD-T753-avr-tb6 维修电路原理图.pdf
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 sometimes) 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 coating 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
