NAD-522-cd-mod59818 电路图 维修手册.pdf

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1、NAD 522 MODIFICATION PROBLEM: CD will not read in, CD is spinning on high speed. CAUSE: The 5V to the RF amplifier / laserunit is too low; zener diode D505 is defective, regulator U506 (78L05A) can also be defective. SOLUTION: Replace D505, zener 4.3V, 0.5W by 3.3V, 1.3W type. Replace the regulator

2、U506 from 78L05A (TO-92 housing) by a 7805 in a TO-220 housing (MC78M05 or equivalent). PRODUCTION: The zener and regulator will change in production, starting with serial number : We will advise you to replace this zener whenever a 522 comes in for any service. PAGE 5-98-18 RadioFans.CN 收音机爱 好者资料库