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ESD PRECAUTIONS
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Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static 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 removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive sur-
face such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient 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 leads 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 device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE 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 your foot from a carpeted floor can gen-
erate static electricity sufficient to damage an ESD device).
CAUTION. GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS
INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DAN-
GEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE
SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE
LITERATURE.
Summary of Contents for LM-U2350A
Page 7: ... 1 6 ...
Page 17: ... 2 10 INTERNAL BLOCK DIAGRAM of ICs HA12237F BLOCK DIAGRAM ...
Page 18: ... 2 11 NJW1190 BLOCK DIAGRAM AF330W20FS BLOCK DIAGRAM ...
Page 20: ... 2 13 AF350W01FS BLOCK DIAGRAM PIN CONFIGURATION ...
Page 22: ...2 15 2 16 BLOCK DIAGRAM ...
Page 23: ...2 17 2 18 WMA_USB BLOCK DIAGRAM ...
Page 24: ...2 19 2 20 SCHEMATIC DIAGRAMS FRONT SCHEMATIC DIAGRAM ...
Page 25: ...2 22 2 21 MAIN SCHEMATIC DIAGRAM ...
Page 26: ...2 23 2 24 DECK SCHEMATIC DIAGRAM ...
Page 27: ...2 26 2 25 MIC SCHEMATIC DIAGRAM ...
Page 28: ...2 27 2 28 USB_AUX2_H P SCHEMATIC DIAGRAM ...
Page 29: ...2 30 2 29 WOOFER AMP SCHEMATIC DIAGRAM ...
Page 30: ...2 31 2 32 AMP SCHEMATIC DIAGRAM ...
Page 31: ...2 34 2 33 POWER SCHEMATIC DIAGRAM ...
Page 32: ...2 35 2 36 POWER SCHEMATIC DIAGRAM ...
Page 33: ...2 37 2 38 SUB POWER SCHEMATIC DIAGRAM ...
Page 34: ...2 39 2 40 CDP SCHEMATIC DIAGRAM ...
Page 35: ...2 41 2 42 USB SCHEMATIC DIAGRAM ...
Page 36: ...2 43 2 44 WIRING DIAGRAMS ...
Page 37: ... PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD 2 45 2 46 ...
Page 38: ...2 47 2 48 MAIN AMP P C BOARD ...
Page 39: ...2 49 2 50 MAIN AMP P C BOARD ...
Page 40: ...2 51 2 52 FRONT P C BOARD ...
Page 41: ...2 53 2 54 CDP P C BOARD ...
Page 42: ...2 55 2 56 CDP P C BOARD ...
Page 43: ...2 57 2 58 POWER P C BOARD ...
Page 44: ...2 59 2 60 POWER P C BOARD ...
Page 45: ...2 61 2 62 SUB POWER P C BOARD ...
Page 46: ...2 63 2 64 WOOFER AMP P C BOARD ...
Page 47: ...2 65 2 66 ...
Page 55: ... 4 4 ...
