SERVICING PRECAUTIONS
CAUTION : Before servicing the DVD player covered by this serviceElectrostatically Sensitive (ES) Devices
data and its supplements and addends, read and follow the SAFETYSome semiconductor (solid state) devices can be damaged easily by
PRECAUTIONS. NOTE : if unforeseen circumstances create conflictstatic electricity. Such components commonly are called
between the following servicing precautions and any of the safetyElectrostatically Sensitive (ES) Devices. Examples of typical Es
precautions in this publications, always follow the safety precautions.devices are integrated circuits and some field effect transistors and
Remembers Safety First:semiconductor chip components.
The following techniques should be used to help reduce the
General Servicing Precautions
incidence of component damage caused by static electricity.
1. Always unplug the DVD player AC power cord from the AC power
source before:1.Immediately before handling any semiconductor component or
(1)Removing or reinstalling any component, circuit board,semiconductorequipped assembly, drain off any electrostatic
module, or any other assembly.charge on your body by touching a known earth ground.
(2)Disconnection or reconnecting any internal electrical plug orAlternatively, obtain and wear a commercially available
other electrical connection.discharging wrist strap device, which should be removed for
(3)Connecting a test substitute in parallel with an electrolyticpotential shock reasons prior to applying power to the unit under
capacitor.test.
Caution: A wrong part substitution or incorrect polarity installation
of electrolytic capacitors may result in an explosion hazard.2.After removing an electrical assembly equipped with ES devices,
place the assembly on a conductive surface such as aluminum
2. Do not spray chemicals on or near this DVD player or any of itsfoil, to prevent electrostatic charge buildup or exposure of the
assemblies.assembly.
3. Unless specified otherwise in this service data, clean electrical3.Use only a grounded-tip soldering iron to solder or unsolder ES
contacts by applying an appropriate contact cleaning solution todevices.
the contacts with a pipe cleaner, cottontipped swab, or
comparable soft applicator.4.Use only an antistatic solder removal device. Some solder
Unless specified otherwise in this service data, lubrication ofremoval devices not classified a Oanti-static� can generate
contacts is not required.electrical charges sufficient to damage ES devices.
4. Do not defeat any plug/socket B+ voltage interlocks with whitch5.Do not use freonpropelled chemicals. These can generate
instruments covered by this service manual might be equipped.electrical charge sufficient to damage ES devices.
5. Do not apply AC power to this DVD player and/or any of its6.Do not remove a replacement ES device from its protec tive
electrical assemblies unless all solid-state device heat sinks arepackage until immediately before you are ready to install it. (Most
cerrectly installed.replacement ES devices are packaged with leads electrically
shorted together by conductive foam, aluminum foil, or
6. Always connect test instrument ground lead to the appropriatecomparable conductive material).
ground before connection the test instrument positive lead. Always
remove the test instrument ground lead last.7.lmmediately before removing the protective material from the
leads of a replacement ES device, touch the protective material to
Insulation Checking Procedurethe chassis or circuit assembly into which the device will be
Disconnect the attachment plug from the AC outlet and turn theinstalled.
power on. Connect an insulation resistance meter(500V) to the
blades of the attachment plug. The insulation resistance betweenCaution : Be sure no power is applied to the chassis or circuit, and
each blade of the attachment plug and accessible conductive partsobserve all other safety precautions.
(Note 1) should be more than 1M-ohm.
Note 1 : Accessible Conductive Parts including Metal panels, Input8.Minimize bodily motions when handing unpackaged replacement
terminals, Earphone jacks, etc.ES devices. (Normally harmless motion such as the brushing
together of your clothes fabric or the lifting of your foot from a
carpeted floor can generate static electricity sufficient to damage
an ES device.)
1-4 |