Rohde-schwarz-sme-service-manual-book4 CHAPT8 – Service manual (PDF)

Erik from ManualsPlus — Sat, 13 Dec 2025 10:18:18 +0000

The Rohde & Schwarz SME service manual provides detailed instructions for setting up, operating, and troubleshooting the FM-Modulator SM-B5, including descriptions of functional units like the FM-Hubteiler, FM and PHIM control loops, and the mixer stage. It also covers testing and adjusting components, diagnosing issues with frequency and phase modulation, and ensuring the spectral purity and level accuracy of the output signal.

Brand: Rohde-schwarz-sme-service-manual-book4
Model: CHAPT8
Type: service manual
File size: 7.3 MB

Manual Overview

The service manual for the Rohde & Schwarz FM Modulator SM-B5 provides detailed guidance on troubleshooting, diagnostics, calibration, and adjustments at the board level. The manual outlines the functional description of the FMOD module, which is responsible for analog frequency and phase modulation. It divides the module into three main functional units: FM-Hubteiler, FM and PHIM control loops, and the mixer stage. Troubleshooting focuses on identifying errors in frequency and phase modulation, spectral purity, and output signal level discrepancies. Diagnostics involve using specific measurement devices and tools to pinpoint faults. Calibration and adjustments are crucial for maintaining the accuracy of the FM oscillator, phase control loops, and modulation signals. The manual describes the process for adjusting the FM-AC center frequency deviation and FM regulation, as well as the phase modulation distortion factor. Board-level guidance includes examining the FM-Hubteiler, FM and PHIM control loops, and the mixer stage, with specific instructions for checking and adjusting various components and signals to ensure optimal performance.

Quick Issues Covered

Diagnose frequency modulation errors and phase modulation issues.
Calibrate FM oscillator and adjust phase modulation loop.
Troubleshoot output signal level errors and spectral purity issues.

Overview

The document is a service manual for the Rohde & Schwarz FM-Modulator SM-B5, identified by the code 1036.8489.02. It covers various technical aspects of the FM-Modulator, including testing and repairing the assembly, functional descriptions, troubleshooting frequency and phase modulation errors, and adjustments of different components such as the FM oscillator and phase loop. The manual provides detailed information on the FM-Hub divider, FM and PHIM control loops, and mixer stage, along with the necessary equipment and tools for maintenance.