Harman Kardon AVR7000 Preliminary Service Manual

Also see for AVR 7000: Owner's manual Brochure Test report Owner's manual Specifications

Contents

1. Inspect all lead dress to make certain thatleads are not pinched or that hardware is notlodged between the chassis and other metalparts in the unit.2. Be sure that any protective devices such asnonmetallic control knobs, insulating fish-papers, cabinet backs, adjustment andcompartment covers or shields, isolationresistor-capacity networks, mechanicalinsulators, etc. Which were removed for theservicing are properly re-installed.Before returning the unit to the user, perform the following safety checks :3. Be sure that no shock hazard exists ; check for leakagecurrent using Simpson Model 229 Leakage Tester, standardequipment item No. 21641, RCA Model WT540A or usealternate method as follows : Plug the power cord directlyInto a 120 volt AC receptacle (do not use an IsolationTransformer for this test). Using two clip leads, connect a1500 ohms, 10watt Resistor paralleled by a 0.15uF capacitor, in series with all exposed metal cabinet parts and a known earth ground, suchas a water pipe or conduit. Use a VTVM or VOM with 1000 ohms per volt, or higher sensitivity to measure the AC voltage drop across theresistor. (See diagram) Move the resistor connection to each exposed metal part 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. (This test should beperformed with the 0.35 volt RMS or more is excessive and indicates a potential shock hazard which must be corrected before returning theunit to the owner.