Sharp CD-SW330 Service Manual - Page 3

CHAPTER 1: GENERAL DESCRIPTION CD-SW330 [1] Important Service Safety Precaution CAUTION : "These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so". WARNING 1. For continued safety, no modification of any circuit should be attempted. 2. Disconnect AC power before servicing. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH SAME TYPE F801,F802, 5A,125V/ F803, F804, 2A,125/ F805, 8A,125V FUSES ATTENTION: POUR ASSURER UNE LONGUE PROTECTION CONTRE UN INCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DE TYPE F801,F802, 5A,125V/ F803, F804, 2A,125/ F805, 8A,125V [2] Important Service Notes (for U.S.A only) BEFORE RETURNING THE AUDIO PRODUCT (Fire & Shock Hazard) Before returning the audio product to the user, perform the following safety checks. 1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the audio product. 2. Inspect all protective devices such as insulating materials, cabinet, terminal board, adjustment and compartment covers or shields, mechanical insulators etc. VTVM AC SCALE 1.5k ohms 10W 3. To be sure that no shock hazard exists, check for leakage current in the following manner. * Plug the AC line cord directly into a 120 volt AC outlet. * Using two clip leads, connect a 1.5k ohm, 10 watt resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as conduit or electrical ground connected to earth ground. TO EXPOSED METAL PARTS 0.15 µ F TEST PROBE CONNECT TO KNOWN EARTH GROUND * Use a VTVM or VOM with 1000 ohm per volt, or higher, sensitivity to measure the AC voltage drop across the resistor (See diagram). All check must be repeated with the AC line cord plug connection reversed. * Connect the resistor connection to all exposed metal parts having a return path to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. AC.) Or more is excessive and indicates a potential shock hazard which must be corrected before returning the audio product to the owner. 1 - 1