Model
8903B
Service
Section
8
SERVICE
8-1.
INTRODUCTION
This section contains information for troubleshooting and repairing the Audio Analyzer. Included are trou-
bleshooting tests, block and schematic diagrams, and principles of operation.
8-2.
SERVICE SHEETS
The foldout pages in the last part of this section are block diagrams (BDl through BDS) and service sheets (1
to
21 and A
to
C).
8-3.
Block Diagrams
Block Diagram
1
(BD1) is an overall block diagram that breaks the instrument into functional sections. It
serves as an index to the other block diagrams and as a starting point for troubleshooting (refer
to
Genc~rnl
Troirhleshooting,
paragraph 8-16). The other block diagrams (BD2 through BD5) cover the Measurement, Source,
Digital, and Power Supply Sections of the instrument, respectively. These block diagrams break the sections
into physical assemblies and serve
as
an index
to
the schematic service sheets. Included with the block diagrams
are troubleshooting checks and discussions of the principles of operation.
8-4.
Schematics
Service Sheets
1
through
2
1
consist
of
assembly schematic diagrams, principles of operation discussions, com-
ponent locator drawings, troubleshooting checks and hints, and, when necessary, mnemonic tables.
8-5.
Additional
Service
Sheets
Service Sheets
A
and B contain disassembly procedures and exploded views of the front- and rear-panel assem-
blies. Service Sheet
C
contains a summary of Service Special Functions and Error Messages.
8-6.
SAFETY
CONSIDERATIONS
8-7.
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 Audio Analyzer and all test equipment.
8-8.
Safety
Pay attention
to
WARNINGS
and CAUTIONS. They must be followed for your protection and to avoid
damage
to
the equipment.
8-
1
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