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SECTION 7
MAINTENANCE
7.1 INTRODUCTION
This section contains information
necessary to maintain,
calibrate, and troubleshoot
the Model 194. Fuse replace-
ment, line voltage selection, and option installation
pro-
cedures are also included.
WARNING
7.2 LINE VOLTAGE SELECTION
The procedures
in this section
are intended
for
use only by qualified
service
personnel.
Do not
perform
these
procedures
unless
you
are
qualified
to do so. Some of the procedures
may
expose
you to potentially
lethal voltages
(> 30V
RMS)
that
could
result
in personal
injury
or
death
if normal
safety
precautions
are
not
observed.
Information
in this section is arranged as follows:
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
Line Voltage
Selection:
Describes the procedure for
checking or setting the operating line voltage of the
instrument.
Disconnect
the
line
cord
and
all
other
in-
struments
from the Model
194 before
removing
the top cover.
Fuse
Replacement:
Outlines
the
procedures
necessary to rcplacc the line, and digital
supply,
fuses.
Option
Installation:
Gives the procedure for install-
ing the Model 1944 AID Module.
Calibration:
Details the procedure for calibrating the
Model
194, including
recommended
calibration
cqulpment.
2. Locate the line voltage selection s\\itch adjacc,nt t<, the
power transformer on the mother board (we t~igure 7-l).
3. Place the line voltage selection switch in the ,3ppropriatc
position,
as outlined
in Table 7-l.
4. If the line voltage setting has bwn changc~d, inst.111 '1 znc~\\
fuse, as discussed in paragraph 7.3.
Special
Handling
of
Static-Sensitive
Devices:
Covers precautions to be taken when handling static-
sensitive parts within
the instrument.
CAUTION
The correct
fuse type must be used to maintain
proper
instrument
protection.
Disassembly:
Lists the procedure for disassembling
and rc-assembling
the instrument.
5. Mark the selected line voltage on the label for future
reference.
Troubleshooting:
Gives troubleshooting
procedures
6. Replace the top cover, being careful not tcr snag wiws,
for the various
boards and modules
within
the
and secure it with the two screws that wew rem<wd
Model 194.
earlier.
Fan Filter
Cleaning/Replacement:
Gives
the pro-
cedure
for cleaning
the fan, or replacing
it if
necessary.
7.10 Z Output
High
Level
Modification:
Describes hart
to set the Z output
high lcvcl to +SV or +~lSV.
7.11 Circuit
Board
Jumper
Locations:
Show
tiw fxtor)
positions
for the jumpers Iocittwl on the :\ 1) .~nd
mother boards.
WARNING
7-f
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