Technical Manual
HDFS-550/551/552 Frame Synchronizer Cards
Publication 81-9059-0606-0, Rev. A
v
Important Safeguards and Regulatory Notices
Information on the following pages provides important safety guidelines for both Operator and Service
Personnel. Specific warnings and cautions will be found throughout the manual where they apply, but may
not appear here. Please read and follow the important safety information, noting especially those instructions
related to risk of fire, electrical shock, or injury to persons.
Danger
•
Electrical potential is still applied to some internal components even when power switch/breaker is in
the off position. To
prevent electrical
shock
when working on this equipment, disconnect the AC line
cord source before working on any internal components.
•
Residual voltage may be present immediately after unplugging the system due to slow discharge of
large power supply capacitors. Wait 30 seconds to allow capacitors to discharge before working on
the system.
Warnings
•
Any instructions in this manual that require opening the equipment cover or enclosure are for use by
qualified service personnel only
. To reduce the risk of electric shock, do not perform any servicing
other than that contained in the operating instructions unless you are qualified to do so.
•
Heed all warnings in the unit and in the operating instructions.
•
Do not use this equipment in or near water.
•
Disconnect AC power before installing any options unless explicitly told to do so in this manual.
•
This equipment is grounded through the grounding conductor of the power cord. To avoid electric
shock, connect the power cord to the equipment and plug it into a properly grounded receptacle
before connecting the equipment inputs and outputs. Receptacle grounding conductor must be
connected to earth ground at the service equipment.
•
Dangerous voltages exist at several points within this equipment. To avoid personal injury, refer all
servicing to qualified personnel.
•
During installation, do not use the door handles or front panels to lift the equipment as they may open
abruptly and injure you.
•
To avoid fire hazard, use only components on the specified type, voltage and current rating as
referenced in the appropriate parts list. Always refer fuse replacement to qualified service personnel.
•
To avoid explosion, do not operate this equipment in an explosive atmosphere unless it has been
specifically certified for such operation.
•
Have qualified personnel perform safety checks after any completed service.
•
To reduce the risk of electric shock, ensure that the two power supply cords (if so equipped) are each
plugged into a separate branch circuit.
•
If equipped with a redundant power supply, this unit has two power cords. To reduce the risk of
electric shock disconnect both power supply cords before servicing.
