HP 8508A - Page 111

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8-1 INTRODUCTION
Service
Section 8
The
service
section
contains
all
the
information
necessary
to
enable
qualified
service
personnel
to
troubleshoot
and
repair
the
HP
8508A
Vector
Voltmeter.
8-2
SAFETY
CONSIDERATIONS
Before
applying
power
to
the
instrument
or
removing
any
of
the
covers,
review
the
following
warnings
and
cautions.
WARNING
THESE
SERVICING
INSTRUCTIONS
ARE
FOR
USE
BY
TRAINED
SERV-
—
ICE
PERSONNEL
ONLY.
TO.
AVOID
ELECTRICAL
SHOCK,
DO
NOT
PERFORM
ANY
SERVICING
OTHER
THAN
THAT
CONTAINED
IN
THE
OPERATING
INSTRUCTIONS
UNLESS
YOU
ARE
QUALIFIED
TO
DO
SO.
TO
PROTECT
OPERATING
PERSONNEL,
THE
INSTRUMENT
CHASSIS
AND
CABINET
MUST
BE
GROUNDED.
THE
INSTRUMENT
IS
EQUIPPED
WITH
A
THREE-WIRE
POWER
CORD
WHICH,
WHEN
PLUGGED
INTO
AN
APPROPRIATE
RECEPTACLE,
GROUNDS
THE
INSTRUMENT.
THE
OFFSET
PIN
ON
THE
ON
THE
POWER
PLUG
IS
THE
GROUND
CONNEC-
TION.
TO
PRESERVE
THIS
PROTECTION
FEATURE,
THE
POWER
PLUG
SHALL
ONLY
BE
INSERTED
IN
A
THREE-TERMINAL
RECEPTACLE
HAVING
A
PROTECTIVE
EARTH
GROUND
CONTACT.
THE
PROTECTIVE
ACTION
MUST
NOT
BE
NEGATED
BY
THE
USE
OF
AN
EXTENSION
CORD
OR
ADAPTER
THAT
DOES
NOT
HAVE
THE
REQUIRED
EARTH
GROUND
CONNECTION.
GROUNDING
ONE
CONDUCTOR
OF
A
TWO-
CONDUCTOR
OUTLET
IS
NOT
SUFFICIENT
PROTECTION.
CAUTION
1.
To
prevent
damage
to
the
instrument
power
supply
circuits,
verify
that
the
line
voltage
selection
switch
(located
on
the
instrument
rear
panel)
is
set
to
the
correct
line
voltage.
2.
The
HP
8508A
and
its
Input
Modules
contain
static
sensitive
devices
which
may
be
damaged
as
a
result
of
static
discharge.
3.
To
prevent
equipment
damage,
do
not
disconnect
circuit
boards
when
the
POWER
switch
is
ON.
4.
To
avoid
contamination
of
circuit
board
connectors,
DO
NOT
HANDLE
or
TOUCH
the
connector
pins.
8-1