NAD-C320BEE-int-tbH200401 电路图 维修手册.pdf

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1、Page 1 of 3 Technical Bulletin C320BEE Product: Integrated Amplifier Hardware Technical Bulletin: H2004-01 Date: May 25, 2004 Subject: NOISE IN UNIT Note: n/a Previous service bulletins required: ? ? YES NO DESCRIPTION: You may have a complaint of mechanical noise, a faint oscillation around 800Hz i

2、s coming from the C320BEE. This only affects a small number of units. REASON: The volume control circuit is oscillating. SOLUTION: Components in the volume control circuit and power supply are to be removed. 1) On the main pc board shown in figure 3, the diode D430 change from 1N4001, to a jumper li

3、nk. Remove the zener diode D58 5v6 0.5W . See figure 1 for schematic change. 2) On the power supply board shown in figure 4 remove D429 and install a jumper link in its place. See figure 2 for the schematic change. Figure 1 RadioFans.CN 收音机爱 好者资料库 Page 2 of 3 Technical Bulletin C320BEE Product: Inte

4、grated Amplifier Hardware Technical Bulletin: H2004-01 Figure2 Figure 3 D430 , REMOVE AND INSTALL JUMPER D58, REMOVE RadioFans.CN 收音机爱 好者资料库 Page 3 of 3 Technical Bulletin C320BEE Product: Integrated Amplifier Hardware Technical Bulletin: H2004-01 Figure 4 Contact: NAD Electronics International 633 Granite Court Pickering, ON Canada L1K 3K1 Voice: 905-831-0799 FAX 905-837-6357 D429 , REMOVE AND INSTALL JUMPER RadioFans.CN 收音机爱 好者资料库