HP 7957A Hardware Manual page 5

Hp disc drives hardware support manual
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GENERAL - This product and related documenta-
tion must be reviewed for familiarization with
safety markings and instructions before operation.
SAFETY SYMBOLS
-'-
Instruction manual symbol: the product
will be marked with this symbol when it
is necessary for the user to refer to the
instruction manual in order to protect
the product against damage.
Indicates hazardous voltages.
Indicates earth (ground) terminal.
WARNING
The WARNING sign denotes a hazard.
It calls attention to a procedure or prac-
tice that, if not correctly performed or
adhered to, could result in personal in-
jury.
Do
not
proceed
beyond
a
WARNING sign until the indicated
conditions are fully understood and met.
I
CAUTION
I
The CAUTION sign denotes a hazard.
It:
calls attention to an operating proce-
dure or practice that, 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 until the indicated
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 uninterruptible safety earth
ground must be provided from the main power
Safety Considerations
source to the product input wlnng 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.
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, maintenance, 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 personal injury.
Capacitors inside this product may still be
charged after the product has been disconnec-
ted from the main power source.
To avoid a fire hazard, fuses with the proper
current rating and of the specified type (nor-
mal 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 fusehold-
er by pressing the cap inward and then tUfiting
it clockwise until it locks in place.
3

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