Maintenance—2213 Service
TROUBLESHOOTING
INTRODUCTION
Preventive maintenance performed on a regular basis
should reveal most potential problems before an instrument
malfunctions. However, should troubleshooting be required,
the following information is provided to facilitate location
of a fault. In addition, the material presented in the
"Theory of Operation" and the "Diagrams" sections of this
manual may be helpful while troubleshooting.
TROUBLESHOOTING AIDS
Schematic Diagrams
Complete schematic diagrams are located on tabbed
foldout pages in the "Diagrams" section. The portions of
circuitry that are mounted on each circuit board are
enclosed within heavy black lines. Also within the black
lines, near either the top or the bottom edge, are the
assembly number and name of the circuit board.
Component numbers and electrical values of compo
nents in this instrument are shown on the schematic
diagrams. Refer to the first page of the "Diagrams" section
for definitions of the reference designators and symbols
used to identify components. Important voltages and wave
form reference numbers (enclosed in hexagonal-shaped
boxes) are also shown on each diagram. Waveform illus
trations are located adjacent to their respective schematic
diagram, and the physical location of each waveform test
point is shown on the appropriate circuit board illustration.
Circuit Board Illustrations
Circuit board illustrations (showing the physical location
of each component) are provided for use in conjunction
with each schematic diagram. Each board illustration can
be found on the back side of a foldout page, preceding the
schematic diagram(s) to which it relates. If more than one
schematic diagram is associated with a particular circuit
board, the board illustration is located on a left-hand
page preceding the diagram with which the board is first
associated.
Also provided in the "Diagrams" section is an illus
tration of the bottom side of the Main circuit board. This
drawing facilitates troubleshooting by showing the con
nection pads and the location of components that are
mounted on the top side of the board. Probing of Main
board component signals that are inaccessible from the
top side can be achieved without the necessity of dis
assembling portions of the instrument.
Waveform test-point locations are also identified on the
circuit board illustration by hexagonal-outlined numbers
that correspond to the waveform numbers appearing on
both the schematic diagram and the waveform illustration.
Circuit Board Locations
An illustration depicting the location of a circuit board
within the instrument is shown on the foldout page
adjacent to the circuit board illustration.
Circuit Board Interconnection Diagram
A circuit board interconnection diagram is also provided
in the "Diagrams" section to aid in tracing a signal path or
power source between boards. The entire oscilloscope is
illustrated, with plug and jack numbers shown along with
associated pin numbers. The off-board components are also
shown, and the schematic diagram numbers on which
these components can be found are identified.
Power Distribution Diagram
A Power Distribution diagram is provided to aid in
troubleshooting power-supply problems. This diagram
shows service jumpers used to remove power from the
various circuit boards. Excessive loading on a power supply
by a circuit board can be isolated to the faulty board by
disconnecting appropriate service jumpers.
Grid Coordinate System
Each schematic diagram and circuit board illustration
has a grid border along its left and top edges. A table
located adjacent to each schematic diagram lists the grid
coordinates of each component shown on that schematic.
To aid in physically locating a component on the respective
circuit board, this table also lists the circuit-board grid
coordinate of each component.
Adjacent to each circuit board illustration is an alpha
numeric listing of every component mounted on that
board. A second column in this listing identifies the
schematic diagram in which each component can be found.
These component-locator tables are especially useful when
more than one schematic diagram is associated with a
particular circuit board.
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6-5
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