The Marantz NR1501 is a slim-line 5.1 channel AV receiver featuring HDMI connectivity, Dolby Digital and DTS decoding, Audyssey MultEQ auto setup, 50 watts per channel, multi-room capability, and advanced audio processing. This service manual provides comprehensive technical information for service technicians including schematics, disassembly instructions, troubleshooting guides, and parts lists. Below are key sections for technical specifications, service procedures, troubleshooting, and parts information.
Detailed technical specifications and performance characteristics of the Marantz NR1501 AV receiver.
| Parameter | Specification |
|---|---|
| Amplifier Section | 5.1 channels, 50W per channel (8Ω, 20Hz-20kHz) |
| Total Harmonic Distortion | 0.08% (20Hz-20kHz, 8Ω) |
| Frequency Response | 10Hz-100kHz (+1/-3dB) |
| Signal-to-Noise Ratio | 100dB (IHF-A) |
| HDMI Inputs/Outputs | 4 inputs, 1 output (v1.3a with Deep Color) |
| Digital Audio Inputs | 2 optical, 1 coaxial |
| Analog Audio Inputs | 5 stereo pairs |
| Video Inputs | 3 composite, 2 component |
| Power Consumption | 280W (maximum), 65W (no signal) |
| Dimensions (WxHxD) | 440 x 105 x 377 mm |
| Weight | 7.8 kg |
Important safety information for service technicians working on the NR1501 receiver.
WARNING! High voltages present in power supply section - exercise extreme caution. Always discharge large capacitors before servicing.
Step-by-step instructions for disassembling the Marantz NR1501 receiver.
CAUTION! Handle ribbon cables carefully to avoid damage. Note screw locations for reassembly.
Complete schematic diagrams for all major circuit sections.
System block diagrams showing signal flow and interconnections.
Audio Signal Path: Input selection → ADC → DSP → DAC → amplifier → speakers.
Video Signal Path: HDMI/component/composite input → video processor → HDMI output.
Control System: Front panel/remote → microprocessor → various control circuits.
Power Supply: AC input → rectifier → switching regulator → various DC outputs.
Printed circuit board layouts for all major assemblies.
Note: All layouts include component designators matching schematic diagrams.
Systematic troubleshooting procedures for common problems.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Fuse, power supply | Check AC fuse F9001; test power supply voltages. |
| No audio output | Amplifier, mute circuit | Check speaker relays; test amplifier ICs; verify mute control. |
| No HDMI output | HDMI board, firmware | Check HDMI board power; reflash firmware if available. |
| Overheating | Heatsink, bias current | Clean heatsink; check amplifier bias current. |
| Display issues | Display driver, power | Check display voltages; test display driver IC. |
| Remote control not working | Sensor, remote | Test IR sensor circuit; verify remote operation. |
Factory test procedures and performance verification methods.
Test Equipment Required: Oscilloscope, audio generator, distortion analyzer, multimeter.
Complete parts list with manufacturer part numbers and descriptions.
| Part Number | Description | Qty |
|---|---|---|
| IC601 | Main DSP processor | 1 |
| IC701-705 | Amplifier ICs | 5 |
| Q901-Q904 | Power supply transistors | 4 |
| F9001 | AC fuse 5A | 1 |
| C901 | Main filter capacitor 6800μF | 1 |
| TRANS901 | Main power transformer | 1 |
Factory alignment and adjustment procedures.
Amplifier bias adjustment: Measure voltage across emitter resistors and adjust VR701-VR705.
DC offset adjustment: Measure speaker output terminals and adjust if necessary.
Display contrast adjustment: Adjust VR on front panel board for optimal visibility.
Note: All adjustments require specific test conditions and equipment.
Important service notes and common repair issues.
Service Support: Marantz Service Department - refer to service bulletin updates.