Nautel VS1, Troubleshooting Manual, Page: 87 / 109

VS1 Troubleshooting Manual Reading Electrical Schematics
Issue 10.0 2018-10-29 Page 5-3
Structure of schematics
The electrical schematics are structured in a hierarchical format that is based on function and
signal flow. Wherever practical, the signal flow is from left to right. Normally, inputs originate
on the left-hand side and outputs extend to the right-hand side. Exceptions are shown by an
arrow indicating the direction of signal flow.
Figures
SD-1
and
SD-2
identify each major stage and its detailed interconnection. Each stage
contains cross-references that identify which blocks are the signal sources for inputs, or the
destinations for outputs.
When a sub-function is treated as a block in figures
SD-1
and
SD-2
, its detailed circuit
information is included in its own schematic drawing(s), which is also included in this section.
Locating schematic diagram(s) for a functional block
The text inside a functional block provides the key to locating its schematic diagram(s).
1. When a functional block is assigned a reference designation (e.g.,
A2A1
), refer to the
family trees in Section 3, “Parts Lists” on page 3-1 . Follow the family tree branches to the
block that contains the desired reference designation, and associated Nautel nomenclature
(e.g.,
NAPA23/03A PA PWB
). Note the reference designations and Nautel nomenclatures of
all higher assemblies in the path, if applicable.
Example:
A5 NAPA23/03A PA PWB
.
2. Refer to Table 5.1 on page 5-4 and use the reference designation and Nautel nomenclature to
identify the appropriate schematic diagram(s).
Example:
NAPA23/03A PA PWB
is shown on schematic
SD-5
.
3. If necessary, refer to the referenced figure in the schematics at the end of this section
and locate the next, lower-level assembly. Then, repeat this procedure until the desired
schematic diagram is found.
Note: The physical location of a part or assembly was not necessarily a factor during
creation of the schematic. The full reference designation assigned to a part or
assembly, in conjunction with the family tree (see
Section 3, “Parts Lists” on page 3-1 ) and the
assembly detail drawings (see Section 6, “Mechanical Drawings” on page 6-1 ), will identify
its location.