HP 7942 Service Manual page 14

SAFETY CONSIDERATIONS
GENERAL - This product and related documenta-
tion must be reviewed for familiarization with
safety markings and instructions before operation.
-
-
WARNING
CAUTION
SAFETY SYMBOLS
Instruction manual symbol: the
product will be marked with this
symbol when it is necessary for
the user to refer to the instruc-
tion manual in order to protect
the product against damage.
Indica tes hazardous voltages.
Indicates earth (ground) terminal.
The WARNING sIgn denotes a
hazard. It calls attention to a
procedure or practice which, if
not correctly performed or ad-
hered to, could result in personal
injury. Do not proceed beyond a
WARNING sign until the indi-
cated conditions are fully under-
stood and met.
The CAUTION sign denotes a
hazard.
It
calls attention to an
operating procedure or practice
which, if not correctly performed
or adhered to, could result in
damage to or destruction of part
or all of the product. Do not
proceed beyond a CAUTION sign
un til the indica ted conditions are
fully understood and met.
SAFETY EARTH GROUND - This is a safety
class I product and is provided with a protective
earthing terminal. An un interruptible safety earth
ground must be provided from the main power
source to the product input wiring terminals,
power cord, or supplied power cord set. Whenever
it is likely that the protection has been impaired,
the product must be made inoperative and be
secured against any unintended operation.
xii
BEFORE APPLYING POWER - Verify that the
product is configured to match the available main
power source according to the input power con-
figuration instructions provided in this manual.
If this product is to be operated with an autotrans-
former make sure that the common terminal is
connected to the earth terminal of the main power
source.
SERVICING
WARNING
Any servlcmg, adjustment, main-
tenance' or repair of this product
must be performed only by service-
trained personnel.
Adjustments described in this
manual may be performed with
power supplied to the product while
protective covers are removed.
Energy available at many points
may, if contacted, result in per-
sonal injury.
Capacitors inside this product may
still be charged after the product
has been disconnected from the
main power source.
To avoid a fire hazard, fuses with
the proper current rating and of
the specified type (normal blow,
time delay, etc.) must be used for
replacement.
To install or remove a fuse, first
disconnect the power cord from the
device. Then, using a small flat-
bladed screw driver, turn the
fuseholder cap counterclockwise
until the cap releases. Install
either end of a properly rated fuse
into the cap. Next, insert the fuse
and fuseholder cap into the
fuseholder by pressing the cap in-
ward and then turning it clockwise
until it locks in place.