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Model 8904A Service
Section
8
SERVICE
8-1.
INTRODUCTION TO THIS SECTION
This section contains information for troubleshooting
and
repairing the Multifunction Synthesizer.
Included are principles
of
operation, troubleshooting checks, and schematic diagrams for selected
circuits.
8-2.
HOW
THE SECTION
IS
ORGANIZED
Section
8
contains the following:
0
Safety Considerations
0
Service Tools, Helps, and Information
0
Schematic Symbology and Diagram Notes
e
Principles of Operation
0
Troubleshooting
0
Selected Schematic Diagrams and Component Locators (Foldouts
SS1
through
SS4)
8-3.
SAFETY CONSIDERATIONS
Before
Applying
Power
Verify that the instrument is set to match the available line voltage and that the correct fuse
is
installed.
An uninterrupted safety earth ground must be provided
from
the main power source to the instrument
input wiring terminals, power cord,
or
supplied power cord set. In addition, verify that a common
ground exists between the Multifunction Synthesizer and
all
test equipment.
Safety
Pay attention to warnings and cautions. They must be followed both for your protection and to avoid
damage to the equipment.
1-1
Who
should service the instrument?
Maintenance described herein is
performed with power supplied
to
the instrument and with the protective
covers removed. Such maintenance should be performed only
by
service-
trained personnel who are aware of the hazards involved (for example, fire
and electrical shock). When maintenance can be performed without power
supplied, the power should be removed.
8-
1