The Marantz SR4000 is a high-performance AV receiver featuring Dolby Digital and DTS decoding, 5.1 channel surround sound, 80 watts per channel, multiple audio/video inputs, digital optical/coaxial inputs, AM/FM tuner, remote control, and advanced audio processing. This service manual provides comprehensive technical information for service technicians, including schematics, alignment procedures, troubleshooting guides, and replacement parts information.
Detailed technical specifications and performance characteristics of the Marantz SR4000 AV receiver.
| Parameter | Specification |
|---|---|
| Power Output | 80W x 5 channels (8 ohms, 20Hz-20kHz, 0.08% THD) |
| Total Harmonic Distortion | 0.08% (20Hz-20kHz at rated power) |
| Frequency Response | 10Hz-100kHz (+1/-3dB) |
| Signal-to-Noise Ratio | 100dB (line input) |
| Input Sensitivity | 200mV (line), 2.5mV (phono) |
| Digital Inputs | 2 optical, 2 coaxial |
| Video Inputs | 3 composite, 2 S-video |
| Audio Inputs | 5 line, 1 phono, 1 tape |
| Outputs | 5.1 channel pre-out, tape out, headphone |
| Dimensions | 440 x 151 x 378 mm (W x H x D) |
| Weight | 9.8 kg |
| Power Consumption | 280W (maximum) |
System block diagrams showing signal flow and functional relationships between major components.
NOTE: Refer to schematic diagrams for detailed component-level information.
Detailed descriptions of major circuit sections and their operation.
Step-by-step instructions for disassembling the receiver for service access.
WARNING! Disconnect AC power before disassembly. Discharge large capacitors.
Factory alignment procedures and adjustment points for optimal performance.
| Adjustment | Procedure | Test Equipment |
|---|---|---|
| DC Offset | Adjust VR501-VR505 for 0V ±10mV at speaker terminals | Digital multimeter |
| Bias Current | Adjust VR601-VR605 for 10mA across emitter resistors | Millivolt meter |
| FM Tuner Alignment | Adjust L101, L102 for maximum sensitivity | FM signal generator |
| AM Tuner Alignment | Adjust L201 for peak performance at 1MHz | AM signal generator |
| Dolby Level | Adjust input level for 200mV reference | Audio analyzer |
Systematic troubleshooting procedures for common service issues.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Blown fuse, faulty power switch, power supply failure | Check F801 (5A), test power supply voltages, replace Q801 if needed |
| No audio output | Mute circuit engaged, amplifier failure, processor issue | Check mute transistors Q701-Q705, test amplifier IC, verify processor operation |
| Distorted sound | DC offset incorrect, bias current wrong, faulty output transistors | Adjust DC offset and bias, test output transistors Q601-Q605 |
| No digital audio | Digital processor failure, clock circuit issue, input selector | Check IC501 clock signals, test digital input receivers, verify processor reset |
| Tuner not working | Antenna connection, tuner IC failure, alignment needed | Check antenna input, test IC301 voltages, realign if necessary |
| Remote control issues | Batteries, IR receiver, microprocessor | Replace batteries, test IR receiver IC901, check microprocessor operation |
Critical replacement parts and components with manufacturer part numbers.
Complete schematic diagrams for all circuit sections.
NOTE: Schematics show component values, test points, and voltage readings.
Printed circuit board layouts for component placement and trace routing.
CAUTION! Observe electrostatic discharge precautions when handling PCBs.
Essential safety procedures for service technicians.
WARNING! Lethal voltages present in power supply section. Exercise extreme caution.
Important service tips and common issues encountered during repair.
Service Support: Contact Marantz technical support for additional assistance.