The Marantz SR4001 is a high-performance AV receiver featuring 7.1 channel surround sound, 90 watts per channel, HDMI connectivity, Dolby Digital and DTS decoding, multi-room audio capability, AM/FM tuner with 40 station presets, and advanced audio calibration. This service manual provides comprehensive technical information for qualified service technicians including schematics, block diagrams, troubleshooting guides, and repair procedures.
Complete technical specifications for the Marantz SR4001 AV receiver.
| Parameter | Specification |
|---|---|
| Power Output | 90W x 7 (8Ω, 20Hz-20kHz, 0.08% THD) |
| Frequency Response | 10Hz-100kHz (+1/-3dB) |
| Total Harmonic Distortion | 0.08% (20Hz-20kHz at rated power) |
| Signal-to-Noise Ratio | 100dB (IHF-A) |
| Input Sensitivity | 200mV (line), 500μV (FM tuner) |
| HDMI Inputs | 3 inputs, 1 output (version 1.1) |
| Digital Inputs | 2 optical, 2 coaxial |
| Analog Inputs | 6 stereo pairs |
| Video Inputs | 3 composite, 2 component |
| Power Consumption | 550W maximum, 65W standby |
| Dimensions | 440 x 414 x 171 mm (W x D x H) |
| Weight | 12.5 kg |
System block diagrams showing signal flow and major components.
NOTE: Refer to schematic diagrams for detailed circuit information.
Detailed descriptions of major circuit sections and their operation.
WARNING! High voltages present in power supply section. Exercise caution.
Step-by-step instructions for disassembling the receiver.
CAUTION! Always disconnect AC power before disassembly. Discharge large capacitors.
Critical test points and measurement procedures for service diagnostics.
| Test Point | Location | Normal Value | Tolerance |
|---|---|---|---|
| TP1 (+12V) | PSU board near IC501 | +12.0V DC | ±5% |
| TP2 (-12V) | PSU board near IC502 | -12.0V DC | ±5% |
| TP3 (+5V) | Main board near IC101 | +5.0V DC | ±3% |
| TP4 (OSC) | Main board X101 | 16.9344MHz | ±100ppm |
| TP5 (REF) | Main board IC201 pin 23 | 2.5V DC | ±2% |
| TP6 (BIAS) | Amp board VR701 | 8.5mV DC | ±1mV |
| TP7 (PROTECT) | Main board Q601 collector | 0V (normal) | - |
Factory alignment and adjustment procedures for optimal performance.
IMPORTANT: Use specified test equipment and follow procedures exactly.
Systematic troubleshooting guides for common failure modes.
| Symptom | Diagnostic Steps | Likely Causes |
|---|---|---|
| No power | Check AC input, fuse F001, standby voltage | Blown fuse, failed rectifier, SMPS fault |
| Protection mode | Check DC offset, output transistors, thermal sensor | Shorted outputs, bias failure, overheated |
| No audio | Verify input selection, check DAC output, preamp stage | Failed DAC, mute circuit, processor fault |
| HDMI no signal | Check HDMI board power, input detection, EDID | HDMI chip failure, firmware issue |
| Tuner no reception | Verify antenna, check tuner IC supply voltages | Tuner IC failure, alignment needed |
| Distorted audio | Check bias current, output transistors, power supply | Bias misadjustment, failing transistors |
Complete parts list with replacement part numbers and cross-references.
Printed circuit board layouts for all major assemblies.
NOTE: All layouts shown at 1:1 scale for accurate component location.
Critical safety information for service personnel.
WARNING! Lethal voltages present. Only qualified technicians should perform service.
Important service notes and common repair issues.
| Issue | Solution | Reference |
|---|---|---|
| Protection circuit activation | Check output transistors and DC offset | Section 8, page 24 |
| HDMI handshake failure | Update firmware, check EDID ROM | Service Bulletin 07-12 |
| Display dim or segments missing | Replace VFD, check filament voltage | Section 9, part VFD-001 |
| Intermittent audio dropout | Resolder DSP and DAC ICs, check clocks | Technical Note TN-408 |
| Overheating | Clean heatsink, check bias current, verify fan | Section 7, procedure 4 |
| Remote control issues | Replace sensor, check 5V supply to front panel | Section 9, part IRS-001 |
Service Support: Marantz Technical Support: 1-800-370-3745 | www.marantz.com/service