Yamaha A-S501 Service Manual

Also see for A-S301: User guide Owner's manual Owner's manual Owner's manual Owner's manual

Contents

2A-S501/A-S301A-S501/A-S301■ TO SERVICE PERSONNEL1. Critical Components InformationComponents having special characteristics are marked ⚠ andmust be replaced with parts having specifications equal tothose originally installed.2. Leakage Current Measurement (For 120V Models Only)When service has been completed, it is imperative to verifythat all exposed conductive surfaces are properly insulatedfrom supply circuits.• Meter impedance should be equivalent to 1500 ohms shuntedby 0.15 μF.WALLOUTLETEQUIPMENTUNDER TESTAC LEAKAGETESTER OREQUIVALENTINSULATINGTABLE• Leakage current must not exceed 0.5mA.• Be sure to test for leakage with the AC plug in both polarities.For U model“CAUTION”“F1: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE 8A(A‑S501) / 6A (A‑S301), 125V FUSE.”For C modelCAUTIONF1: REPLACE WITH SAME TYPE 8A (A‑S501) / 6A (A‑S301), 125V FUSE.ATTENTIONF1: UTILISER UN FUSIBLE DE RECHANGE DE MÉME TYPE DE 8A (A‑S501) / 6A (A‑S301), 125V.WARNING: CHEMICAL CONTENT NOTICE!This product contains chemicals known to the State of California to cause cancer, or birth defects or other reproductiveharm.DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASONWHATSOEVER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes orexpose eyes to solder/flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your hands beforehandling food.About lead free solder / 無鉛ハンダについてAll of the P.C.B.s installed in this unit and solder joints aresoldered using the lead free solder.Among some types of lead free solder currently available,it is recommended to use one of the following types forthe repair work.• Sn + Ag + Cu (tin + silver + copper)• Sn + Cu (tin + copper)• Sn + Zn + Bi (tin + zinc + bismuth)Caution:As the melting point temperature of the lead free solder isabout 30 C to 40 C (50 F to 70 F) higher than that ofthe lead solder, be sure to use a soldering iron suitable toeach solder.• Sn+Ag+Cu + +• Sn+Cu +• Sn+Zn+Bi + +注意：3040