NAD-T751-avr-st1 维修电路原理图.pdf
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NAD-T751-avr-st1 维修电路原理图.pdf
Service Tip T751Muting circuit changePROBLEM: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 onthe following pages.Components are to be placed in a shrinkable tube and the whole thing is gluedto the AC-3 board. See attached photo and schematic diagram.SECTION A - AC-3 BOARD1. ADD 2SC123 TRANSISTOR 2. ADD 3.3uF/25V CAPACITOR3. ADD 7.5K 1/8W RESISTOR 4. ADD 1N4148 DIODESECTION B - MAIN BOARD1. DELETE R742(4K7) D732 (1N4148) AND C742 (330Uf/10v)2. ADD 2 PCS OF 1N4148 DIODE .3. ADD 10uF /16V ELECTROLYTIC CAPACITOR4. ADD 3K 1/8W RESISTOR5. ADD 1N4001 DIODESECTION 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:GOZT75104401Contact:NAD Electronics International633 Granite CourtPickering, ON Canada L1K 3K1Voice: 905-831-0799 FAX 905-837-6357 NADwww.NAD Page 1RadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库PAGE 2 OF 5PAGE 3 OF 5PAGE 4 OF 5PAGE 5 OF 5
