NV5/NV3.5 Troubleshooting Manual Detailed Circuit Descriptions
Issue 3.2 2014-12-10 Page 2-1
Section 2: Detailed Circuit Descriptions
Refer to the functional block diagram: “NV Series Transmitter Block Diagram” on page 1-9 and high
level descriptions of the NV5/NV3.5 Operation and Maintenance Manual.
This section provides a detailed description of the transmitter’s key modules and assemblies,
including:
• Control/interface PWB (NAPC156A) - see page 2-1
• Remote interface PWB (NAPI115A) - see page 2-2
• RF power module (NAA56/01D) - see page 2-3
NV5/NV3.5 electrical schematics
The descriptions in this section all refer to the NV5/NV3.5 electrical schematics listed in Table 5.1
on page 5-5 of the NV5/NV3.5 Troubleshooting Manual.
Control/interface PWB (NAPC156A)
See electrical schematics Figures SD-10 through SD-17.
Microcontroller
Microcontroller IC U41 interfaces with the transmitter via several serial buses. J17 provides an
isolated RS-232 interface with the front panel’s advanced user interface (AUI). J20 provides an
isolated RS-232 interface for debugging. There are also serial interfaces with exciter A (via J5), exciter
B (via J6), optional SC2 system controller (via J22).
U41 also acts as an internal and external serial interface for transmitter alarm and status signals.
Remote inputs and outputs
The user can interface with up to 24 pre-defined digital inputs, 24 digital outputs and eight analog
outputs via the remote interface PWB (A11A4) (see “Remote interface PWB (NAPI115A)” on
page 2-2). The control/interface PWB configures these inputs and outputs based on customer
interface with the AUI. These inputs and outputs may be user-defined, but are factory defaulted (see
the NV5/NV3.5 Installation Manual for default settings).
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