Nautel NG1000, Troubleshooting Manual

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NG1000 Troubleshooting Manual Reading Electrical Schematics
Issue 0.4 2010-10-12 Page 4-3
Figures
SD-1
through
SD-3
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
through
SD-3
, 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.,
A1A1
), 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.,
NAPC157 System Controller PWB
). Note the reference designations and Nautel
nomenclatures of all higher assemblies in the path.
Example:
A1 NAX251 System Controller > A1A1 NAPC157 System Controller PWB
.
2. Refer to Table 4.1 on page 4-5 and use the reference designation and Nautel nomenclature to
identify the appropriate schematic diagram(s).
Example:
NAPC157 System Controller PWB
is shown on schematics
SD-4
through
SD-6
.
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.
Locating a part or assembly on a schematic
The full reference designation assigned to a part or assembly is the key to physically locating that part
or assembly.
1. Refer to the family trees in Section 3, “Parts Lists” on page 3-1 .
Note: Full reference designations contain the assembly hierarchical coding. When the end item is
divided into units (cabinets), the first coding is a unit number (1, 2, 3, etc.). When the end item is
divided into assemblies, the first coding is an assembly number (A1, A2, A3, etc.). If a unit or an
assembly is divided into sub-assemblies, assembly coding that identifies assembly relationship (1A1,
A2A1, A2A1A1, etc.) is added.