Tektronix TSG 90 PATHFINDER, Руководство по обслуживанию

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Maintenance
TSG 90 PATHFINDER Service Manual
4–3
The circuit number and electrical value of each component is shown on the sche-
matic diagrams. The first page in the Diagrams section explains the schematic
symbols and notations found on the diagrams. The Replaceable Electrical Parts
list gives a complete description of each component. Circuit boards and assem-
blies are shown with a heavy border, for identification. If the border does not
completely encircle the schematic then that schematic only portrays part of the
circuitry on that board or assembly. The name and assembly number of the cir-
cuit board are shown along the border as well as the serial number range that the
schematic represents.
NOTE . Check the Change Information section at the rear of the manual for
inserts describing corrections and modifications to the instrument and manual.
Electrical components, connectors, and test points are identified on circuit board
illustrations located on the inside fold of the corresponding circuit diagram or the
back of a preceding diagram.
The circuit board assemblies are assigned assembly numbers starting with A1.
Circuit boards have been assigned an assembly number so that they may be or-
dered from Tektronix, Inc. They are as follows:
A1 Main Board Assembly
A2 Keypad Board Assembly
A3 LCD Board Assembly
The part numbers for ordering these boards are listed first in the Replaceable
Electrical Parts list (EPL), in Section 5.
The EPL is arranged in assembly-by-assembly order, as designated in ANSI
Standard Y32.16-1975. Each component is assigned a circuit number according
to its location within a circuit, which is shown in the parts list by combining the
assembly number and the circuit number.
EXAMPLE: R123 on assembly A2 would be listed in the EPL as A2R123.
In the EPL, assemblies are listed first, followed by circuit board-mounted parts
in alphanumeric order. Parts mounted on the chassis are listed at the end of the
EPL.
NOTE
. The complete part number shown in the parts list should be used when
ordering replacement parts.
Diagrams
Circuit Board Illustrations
Numbering