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SECTION
6
MAINTENANCE
6.1 INTRODUCTION
This section
contains
information
necessary
to maintain,
calibrate,
and troubleshoot
the Model
193. Fuse rcplacc-
lment
and
line
voltage
selection
procedures
are aIs0
included.
WARNING
The procedures
included
in this section
are for
use only by qualified
service
personnel.
Do not
perform
these procedures
unless qualified
to do
so. Many of the steps in this section
may expose
you to potentially
lethal voltages
that could result
in personal
injury
or death
if normal
safety
precautions
are not observed.
6.2 LINE VOLTAGE SELECTION
'The Model
193 may bc operated
from cithcr
'105.125V or
230.250V 50 or hOHz power
sources.
The instrument
was
shipped
from
the factory
set for an operating
voltage
marked
on the rear panel. X> change the line voltajie,
pro-
ceed as follows:
WARNING
Disconnect
the line cord and all other equipment
from
the Model
193 before
removing
the top
cover.
~1. Remove
the top cover as explained
in paragraph
6.7 to
gain access to the internally
located
switch
2. Using
a flat-blade
screwdriver,
place
the line voltage
switch
in the desired
position.
The line voltage
selec-
tion switch
is located
towards
the front
of the instru-
ment near the power
switch.
See Table 6-l for the cor-
rect position.
3. Install a power lint fuse consistent
with the line voltajie.
See paragraph
6.3.~1 for the fuse replacement
procedurr.
CAUTION
The correct
fuse type must be used to maintain
proper
instrument
protection.
4. Mark
the selected
line vt,ltage
on the re,lr panel
for
future
reference
(to avoid
confusion,
erase
the old
mark).
5. Replace the top cover and connect
tht, instrument
to the
line power.
Table
6-1.
Line
Voltage
Selection
6.3 FUSE REPLACEMENT
WARNING
Disconnect
the instrument
from the power
line
and
from
other
equipment
before
replacing
fuses.
6.3.1 Line Fuse
'I. Turn off the power
and disconnect
the liw cord dnd all
other
test cables from
the instrument.
2. Place the end of a flat-blade
scrcwdrivcr
inter the slot in
the line fuse holder on the rear panel. Push in and r<>t.ltt,
the
fuse
carrier
unc-quarter
turr
count~rcl(lckwise.
Release pressure
on the holder
and its intermll
sprinfi
will
push
the fuse and thr cdrricr
c>ut of the h(>ldcr.
3. Remove the fuse and replace it with the pmper
type us-
ing 'lhblc
h-2 as a guide.
CAUTION
Do not
use a fuse
with
a rating
higher
than
specified
or instrument
damage
may occur. If the
instrument
repeatedly
blows
fuses,
locate
and
correct
the cause
of the trouble
before
replac-
ing the fuse.
4. Install
the new fuse and the carrier
intn the' h<rld<%r h)
reversing
the above procedure.
6-l
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