NAD-T751-avr-st1 电路图 维修手册.pdf

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1、 Service Tip T751 Muting circuit change PROBLEM:Popping noise at pre out and speaker out during turn on and off. CAUSE: Muting circuits response is slow. SOLUTION: This requires three steps to complete. Addition information is on the following pages. Components are to be placed in a shrinkable tube

2、and the whole thing is glued to the AC-3 board. See attached photo and schematic diagram. SECTION A - AC-3 BOARD 1. ADD 2SC123 TRANSISTOR 2. ADD 3.3uF/25V CAPACITOR 3. ADD 7.5K 1/8W RESISTOR 4. ADD 1N4148 DIODE SECTION B - MAIN BOARD 1. DELETE R742(4K7) D732 (1N4148) AND C742 (330Uf/10v) 2. ADD 2 PC

3、S OF 1N4148 DIODE . 3. ADD 10uF /16V ELECTROLYTIC CAPACITOR 4. ADD 3K 1/8W RESISTOR 5. ADD 1N4001 DIODE SECTION C- MULTI CHANNEL BOARD.(SEE SCHEMATIC) 1. DELETE R665(10K) 2. CHANGE Q605 FROM RN1241 TO 2SC2878. PRODUCTION: This change has been implemented in production from serial number:GOZT75104401 Contact: NAD Electronics International 633 Granite Court Pickering, ON Canada L1K 3K1 Voice: 905-831-0799 FAX 905-837-6357 NADwww.NAD Page 1 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 PAGE 2 OF 5 RadioFans.CN 收音机爱 好者资料库 PAGE 3 OF 5 PAGE 4 OF 5 PAGE 5 OF 5