NAD-T753-avr-tbh200402a 电路图 维修手册.pdf

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1、Page 1 of 2 Technical Bulletin T753 Product: A/V Receiver Hardware Technical Bulletin: H2004-02 Date: March 12 2004 Subject: Low level Hum Note: Previous T.B.s required: H2004-01 K K K K YES K K K K NO DESCRIPTION: There is a low level hum noise coming from the speakers with no signal applied . REAS

2、ON: The hum is coming from a ground loop thru the pre amp board to the chassis. SOLUTION: In order to do this you must remove the Tuner block assembly first. The ground wire from the pre amp pc board has to be moved from the multi channel input board RCA connector to a ground pad located on the mult

3、i channel board (a black wire already runs to this point). See the following diagrams for reference. Figure 1 RCA connector ground Move this wire RadioFans.CN 收音机爱 好者资料库 Page 2 of 2 Technical Bulletin T753 Product: A/V Receiver Hardware Technical Bulletin: H2004-02 Figure 2 Figure3 Contact: NAD Electronics International 633 Granite Court Pickering, ON Canada L1K 3K1 Voice: 905-831-0799 FAX 905-837-6357 3/15/04 Move wire to this point, Circuit board ground RadioFans.CN 收音机爱 好者资料库