Revox B740 Stereo Power Amplifier Service Manual
by STUDER REVOXComprehensive service and repair manual for the Revox B740 stereo power amplifier, an essential workshop reference for technicians maintaining this 300W-per-channel professional-grade amplifier. The manual provides step-by-step disassembly guidance, including safe procedures for filter capacitor discharge, power stage removal, front panel takedown, meter lamp replacement, and fuse service. Covers voltage selector adjustment for different mains supply configurations. Detailed technical specifications document the amplifier's 20Hz–20kHz frequency response and rated output into 4-ohm loads. Extensive circuit descriptions explain the fail-safe protection architecture and peak program meter amplifier design. Electrical adjustment procedures guide setup and calibration, with clear specifications for required test equipment. Performance measurement instructions cover frequency response testing, harmonic distortion analysis, signal-to-noise ratio verification, and crosstalk attenuation checks—critical for validating amplifier performance after service or repair. Includes dimensional drawings and component layout diagrams for both front and rear panels, plus detailed part identification to support accurate component location and replacement during maintenance or troubleshooting.
Table of Contents:
- General
- Technical data
- Dimensions
- Dismantling
- Removal of top cover
- Discharging the filter capacitors
- Removal of power stages
- Removal of front panel
- Lamp replacement for meter illumination
- Replacement of main fuse
- Adjustment of voltage selector
- Replacement of power supply fuses
- Removal of output stages and preamplifier circuit boards
- Removal of power supply
- Removal of meter amplifier
- Removal of filter capacitor
- Removal of rotary switches
- Circuit description
- Description of block diagram
- Description of fail-safe circuits
- Description of peak program meter amplifier
- Electrical Adjustments
- Test equipment
- Adjustment of stabilized supply voltages
- Adjustment of quiescent current
- Level check
- Calibration of the peak program meters
- Instructions for measuring the most important performance data
- Frequency response check, without load
- Frequency response check, with load
- Harmonic distortion
- Signal to noise ratio
- Crosstalk attenuation
- Diagrams
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Document Details
- Format
- Pages
- 40
- Size
- 38.2 MB
- Category
- Audio & HiFi