Service manual

Replacement
Strategy
The replacement strategy also depends on the application. If some
relays are used more often, or at higher load, than the others, the relays
can be individually replaced as needed. If all of the relays see similar
loads and switching frequencies, the entire circuit board can be
replaced when the end of life approaches. The sensitivity of the
application should be weighed against the cost of replacing relays with
some useful life remaining.
NOTE
Relays that wear out normally or fail due to misuse should not be
considered defective and are not covered by the product’s warranty.
Safety Considerations
This product is a Safety Class I instrument that is provided with a
protective earth terminal when installed in the mainframe. The
instrument, mainframe, and all related documentation should be reviewed
for familiarization with safety markings and instructions before operation
or service.
Refer to the WARNINGS on page 4 in this manual for a summary of safety
information. Safety information for testing and service follows and is also
found throughout this manual.
WARNINGS and
CAUTIONS
This section contains WARNINGS which must be followed for your
protection and CAUTIONS which must be followed to avoid damage to the
equipment when performing instrument maintenance or repair.
WARNING
SERVICE-TRAINED PERSONNEL ONLY. The information in this
manual is for service-trained personnel who are familiar with
electronic circuitry and are aware of the hazards involved. To
avoid personal injury or damage to the instrument, do not
perform procedures in this manual or do any servicing unless
you are qualified to do so.
CHECK MAINFRAME POWER SETTINGS. Before applying
power, verify that the mainframe setting matches the line
voltage and that the correct fuse is installed. An uninterruptible
safety earth ground must be provided from the main power
source to the supplied power cord set.
Chapter 1 General Information 11