MPC3000 SERVICE MANUAL ocr

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SE R u iiE m nnun LAKAI MIDI PRODUCTION CENTER MODEL MPC3000 ★ SAFETY INSTRUCTIONS PRECAUTIONS DURING SERVICING SAFETY CMECK AFTER SERVICING 1 . Parts identified by the A (*) symbol are critical for After servicing, make measurements of leakage-current safety, Replace them only with the parts number specified. or resistance in order to determine that exposed parts 2. In addition to safety, other parts and assemblies are areacceptabtyinsulatedfrom thesupplycircuit. specified for conformance with such regulations as The leakage-current measurement should be done be­ those applying to spurious radiation. 丁hese must also tween accessible metal parts (such as chassis, ground be replaced only with the specified replacements. terminal, microphone jacks, signal input/output connectors, Examples: RF converters, tuner units, antenna selector etc.) and the earth ground through a resistor of 1500 switches, RFcables, noise blocking capacitors, ohms paralleled with a 0.15 pF capacitor, under the unit's noise blocking filters, etc. normal working conditions. The leakage-current should 3. Us© specified internal wiring. Note especially: be less than 0.5 mA rms AC. 1 ) Wires covered with PVC tubing…