NAD-522-cd-mod59901 电路图 维修手册.pdf

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1、NAD 522/L40 MODIFICATION Adding Protection circuit after changing the laser mechanism This will prevent further damage by ESD, power surges etc. MODIFICATION: After changing the laser mechanism (partno: 4102-5002-0) please perform the following modification: 1) Change R137 from 10 Ohm to 20 Ohm 1/8

2、W min. 2) Add a diode 1N4148 between LD and GND on J2 (cable connection to laser unit), Kathode to LD. 3) Cut trace just after collector Q101. 4) Add coil 10uH in between here. The required parts are available from FED in a small kit, partno: 522-LASER-PROT-KIT PRODUCTION: Please note this modification is being implemented in running production. The Nad 524 already has this modification except for: 1) Change R137 PAGE 5-99-01 RadioFans.CN 收音机爱 好者资料库