Download  Print this page

Safety Precautions - Compaq CRT Monitor s7500 Service Manual

Color monitor.
Hide thumbs


Table of Contents
There are special components used in this color monitor
which are important for safety. These parts are marked
on the schematic diagram and the replacement
parts list. It is essential that these critical parts should be
replaced with the manufacturer's specified parts to
prevent X-radiation, shock, fire, or other hazards. Do not
modify the original design without obtaining written
permission from manufacturer or you will void the original
parts and labor guarantee.
CAUTION: No modification of any circuit should be
Service work should be performed only after
you are thoroughly familiar with all of the
following safety checks and servicing
Care should be taken while servicing this color monitor
because of the high voltage used in the deflection circuits.
These voltages are exposed in such areas as the
associated flyback and yoke circuits.
An isolation transformer must be inserted between the
color monitor and AC power line before servicing the
• In servicing, attention must be paid to the original lead
dress specially in the high voltage circuit. If a short
circuit is found, replace all parts which have been
overheated as a result of the short circuit.
• All the protective devices must be reinstalled per the
original design.
• Soldering must be inspected for the cold solder joints,
frayed leads, damaged insulation, solder splashes, or
the sharp points. Be sure to remove all foreign
All used display tubes are equipped with an integral
implosion protection system, but care should be taken to
avoid damage and scratching during installation. Use only
same type display tubes.


The only potential source of X-radiation is the picture tube.
However, when the high voltage circuitry is operating
properly there is no possibility of an X-radiation problem.
The basic precaution which must be exercised is keep the
high voltage at the factory recommended level; the normal
high voltage is about 25.5kV. The following steps describe
how to measure the high voltage and how to prevent X-
Note : It is important to use an accurate high voltage
• To measure the high voltage, use a high impedance
high voltage meter, connect (–) to chassis and (+) to
the CDT anode cap.
• Set the brightness control to maximum point at full
white pattern.
• Measure the high voltage. The high voltage meter
should be indicated at the factory recommended level.
• If the meter indication exceeds the maximum level,
immediate service is required to prevent the possibility
of premature component failure.
• To prevent X-radiation possibility, it is essential to use
the specified picture tube.
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.
- 3 -
meter calibrated periodically.


Table of Contents

   Also See for Compaq CRT Monitor s7500

   Related Manuals for Compaq CRT Monitor s7500

This manual is also suitable for:


Comments to this Manuals

Symbols: 0
Latest comments:
  • mesa Mar 31, 2017 04:23:
    muy, pero muy bueno el manual del monitor, lo que hace falta es cvomo descargarl​o