NAD-T163-pre-tb3维修电路原理图.pdf
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1、PAGE 1 OF 5 Technical BulletinT163 Product: A/V Tuner Preamplifier Hardware Technical Bulletin: T163-H2004-03 Date:August 24/04Subject:Residual Noise Note:Implemented in production from Serial number :R47T1630186 Previous T.B.s required: Please refer to the following software bulletin to perform the
2、 software upgrade procedure. K K K K YEST163-S2004-01 Software Upgrade Procedure K K K K NO DESCRIPTION: At high volume setting with no signal on an unterminated analogue input, there maybe some audiable residual hum noise and whistling sound coming form one or more channels. REASON:The residual noi
3、se is coming from power supply ground and DSP ground. The whistle noise is coming from the DSP board. SOLUTION: Remove the DSP board and order the replacement DSP board from our spares department . This board will require version 2.03 software or later,check for current version on our service websit
4、e, . Also see above for software bulletin for the software upgrade procedure. Order the part number for the DSP board using this number, 80-0907630-65-00 from our spares department. This board has Dolby Pro LogicIIx installed. NOTE: The HDCD decoder is replaced by the Dolby PLIIx decoder. Ground Cha
5、nges 1. Change the cable between J617 on Pre-out board and Multi-channel RCA from AWG22 to AWG18. Figure1 Contact: NAD Electronics International 633 Granite Court Pickering, ON Canada L1K 3K1 Voice: 905-831-0799 FAX 905-837-6357 Note: If this is not present on the unit, add an AWG18 wire between the
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