Nautel NX15, Troubleshooting Manual

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NX25/NX15 Troubleshooting Manual Reading Electrical Schematics
Issue 5.0 2016-05-06 Page 5-3
Figures
SD-1
through
SD-4
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-4
, 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.,
NAPA34A Modulator/Power Amplifier PWB
). Note the reference designations and Nautel
nomenclatures of all higher assemblies in the path.
Example:
A15 NAP39A RF Power Module > A15A1 NAPA34A Modulator/Power Amplifier
PWB
.
2. Refer to Table 5.1 on page 5-5 and use the reference designation and Nautel nomenclature to
identify the appropriate schematic diagram(s).
Example:
NAPA34A Modulator/Power Amplifier PWB
is shown on schematic
SD-24
.
3. If necessary, refer to the referenced figure (e.g.,
SD-24
) 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.