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ESD PRECAUTIONS
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 gener-
ate 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.
Содержание DVT654
Страница 9: ...2 3 3 FRONT CIRCUIT 1 2 PIN104 Pins PIN 27V PIN 6 18V PIN7 22V PIN 5V...
Страница 21: ...2 15 FIG 2 1 FIG 3 1 2 SDRAM CLOCK 1 MT1389 main clock is at 27MHz X601 3 TRAY OPEN CLOSE SIGNAL...
Страница 23: ...2 17 FIG 6 1 FIG 7 1 6 LASER POWER CONTROL RELATED SIGNAL NO DISC CONDITION 7 DISC TYPE JUDGEMENT WAVEFORM...
Страница 24: ...2 18 FIG 7 2 DVD FIG 7 3 CD...
Страница 25: ...2 19 FIG 7 4 CD FIG 8 1 DVD 8 FOCUS ON WAVEFORM...
Страница 26: ...2 20 FIG 8 2 CD FIG 9 1 9 SPINDLE CONTROL WAVEFORM NO DISC CONDITION...
Страница 27: ...2 21 10 TRACKING CONTROL RELATED SIGNAL System checking FIG 10 1 DVD FIG 10 2 CD...
Страница 29: ...2 23 ADAT0 3 FIG 12 2 FIG 13 1 2 COMPOSITE VIDEO SIGNAL 13 MT1389 AUDIO OUTPUT TO PWM IC...
Страница 30: ...2 24 FIG 14 1 14 AUDIO OUTPUT FROM PWM IC...
Страница 31: ...2 25 WIRING DIAGRAM...
Страница 38: ...SMPS 2 SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T 2 33 2 34...
Страница 39: ...2 35 2 36 MICOM SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 40: ...2 37 2 38 I O SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 41: ...2 39 2 40 AMP SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 42: ...2 41 2 42 FRONT SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 43: ...2 43 2 44 H PHONE SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 44: ...2 45 2 46 AV2 SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 45: ...2 47 2 48 DVD PART SCHEMATIC DIAGRAMS MPEG SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 46: ...2 49 2 50 DSP SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 47: ...2 51 2 52 SERVO SCHEMATIC DIAGRAM A B C D E F G H I J K L M N O P Q R S T...
Страница 48: ...3 53 3 54 PRINTED CIRCUIT DIAGRAMS MAIN P C BOARD TOP SIDE...
Страница 49: ...3 55 3 56 MAIN P C BOARD BOTTOM SIDE...
Страница 50: ...2 57 2 58 FRONT P C BOARD TOP SIDE FRONT P C BOARD BOTTOM SIDE...
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Страница 60: ...4 1 SECTION 4 SPEAKER PART 1 WOOFER SPEAKER SECTION MODEL LHS 75SGW 952 959 953 954 955 958 957 950 A900 951...
Страница 61: ...4 2 2 SPEAKER CENTER SECTION MODEL LHS 75SGC A700 750 751 753 756 754 758 759 756 755...
Страница 62: ...4 3 3 SPEAKER REAR FRONT SECTION MODEL LHS 75SGS A800 851 853 850 857 856 858 854 855 859...
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