Harman kardon dvd 37 230 service manual

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3 ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by stat\ ic electricity. Such components com- monly are called Electrostatically Sensitive Devices (ESD). Examples o\ f typical ESD devices are integrated cir - cuits and some field-ef fect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by stati\ c electricity . 1. Immediately before handling any semiconductor component or semiconductor\ -equipped assembly , drain off any electrostatic charge on your body by touching a known earth ground. \ Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be r\ emoved for potential shock reasons prior to applying power to the unit under test. 2. After removing an electrical assembly equipped with ESD devices, place t\ he assembly on a conductive sur - face such as aluminum foil, to prevent electrostatic charge buildup or e\ xposure of the assembly . 3. Use only a grounded-tip soldering iron to solder or unsolder ESD devi\ ces. 4. Use only an anti-static solder removal device. Some solder removal devic\ es not classified as "anti-static" can generate electrical charges suf ficient to damage ESD devices. 5. Do not use freon-propelled chemicals. These can generate electrical charges suf ficient to damage ESD devices. 6. Do not remove a replacement ESD device from its protective package until\ immediately before you are ready to install it. (Most replacement ESD devices are packaged with le\ ads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials). 7. Immediately before removing the protective material from the leads of a \ replacement ESD device, touch the protective material to the chassis or circuit assembly into which the de\ vice will by installed. CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT , AND OBSER VE ALL OTHER SAFETY PRECAUTIONS. 8. Minimize bodily motions when handing unpackaged replacement ESD devices.\ (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of y\ our foot from a carpeted floor can gen - erate static electricity suf ficient to damage an ESD device). harman/kardon Service manual DVD37EU Page 2 of 117

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1 SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediatel\ y prior to use. 2) The pick-up should never be subjected to external pressure or impact. 2. Repair notes 1) The pick-up incorporates a strong magnet, and so should never be brought\ close to magnetic materials. 2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may \ be an operational malfunction and/or damage to the printed-circuit board. 3) Each and every pick-up is already individually adjusted to a high degree\ of precision, and for that reason the adjustment point and installation screws should absolutely never be touched. 4) Laser beams may damage the eyes! Absolutely never permit laser beams to enter the eyes! Also NEVER switch ON the power to the laser output part (lens, etc.) o\ f the pick-up if it is damaged. 5) Cleaning the lens surface If there is dust on the lens surface, the dust should be cleaned away by\ using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, t\ herefore, a cot- ton swab should be used, taking care not to distort this. 6) Never attempt to disassemble the pick-up. Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) \ Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the\ pick-up. Storage in conductive bag NEVER look directly at the laser beam, and donÕt let contact fingers or other exposed skin. Magnet How to hold the pick-up Conductive Sheet Cotton swab Pressure Pressure Drop impact harman/kardon Service manual DVD37EU Page 3 of 117