Servicing Precautions - Daewoo Lucoms CML-710M Service Manual

SERVICING PRECAUTIONS

CAUTION: Before servicing instruments covered by this service manual, its supplements, and
addendum, please read and follow the SAFETY PRECAUTIONS of this manual.
NOTE: If unforeseen circumstances create conflict between the following servicing precautions and any
of the safety precautions on page 1 of this manual, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the AC power cord from the AC power source before:
a. Removing or reinstalling any component, circuit board, module, or any other instrument assembly.
b. Disconnecting or reconnecting any electrical plug or other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.
CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors
may result in a explosion.
2. Test high voltage only by measuring it with an appropriate high voltage meter or other voltage
measuring device (DVM, FETVOM. etc.) equipped with a suitable high voltage probe. Do not test high
voltage by "drawing an arc".
3. Do not any spray chemicals on or near this instrument, or any of its assemblies.
4. Unless otherwise specified in this service manual, only clean electrical contacts by applying the
following mixture to the contacts with a pipe cleaner, cotton-tipped stick, or comparable nonabrasive
applicator: 10% (by volume) Aceton and 90% (by volume) isopropyl alchohol (90%-99% strength).
CAUTION: This is a flammable mixture. Unless specified in this service manual, lubrication of
contacts is not required.
5. Do not apply AC power to this instrument and/or any other of its electrical assemblies unless all the
solid-state device heat sinks are correctly installed.
6. Always connect the test instrument ground lead to the appropriate instrument chassis ground before
connecting the test instrument positive lead. Always remove the test instrument ground lead last.
7. Only use the test fixtures specified in this service manual with this instrument.
4