The Marantz SR4200 is a high-performance audio/video receiver featuring Dolby Digital and DTS decoding, 5.1 channel surround sound, multiple audio/video inputs, AM/FM tuner, and advanced DSP processing. This service manual provides comprehensive technical information for qualified service technicians, including schematics, alignment procedures, troubleshooting guides, and replacement parts information.
Complete technical specifications and performance characteristics of the Marantz SR4200 receiver.
| Parameter | Specification |
|---|---|
| Power Output | 80W x 5 channels (8Ω, 20Hz-20kHz, 0.08% THD) |
| Frequency Response | 10Hz - 100kHz (+1/-3dB) |
| Signal-to-Noise Ratio | 100dB (line input) |
| Total Harmonic Distortion | 0.08% (20Hz-20kHz, rated power) |
| Input Sensitivity | 200mV (line), 2.5mV (phono) |
| Digital Inputs | 2 optical, 1 coaxial |
| Analog Inputs | 6 line level, 1 phono, 1 tape |
| Video Inputs | 3 composite, 2 S-video |
| Dimensions | 440 x 151 x 378mm (W x H x D) |
| Weight | 9.8kg |
System block diagrams showing signal flow and major functional blocks.
WARNING! These diagrams are for reference only. Always verify actual circuit conditions before servicing.
Detailed descriptions of major circuit sections and their operation.
CAUTION! High voltages present in power supply section. Exercise extreme caution.
Step-by-step instructions for disassembling the receiver for service access.
WARNING! Always disconnect AC power before disassembly. Handle circuit boards with care.
Factory alignment procedures and adjustment points.
Systematic troubleshooting procedures for common problems.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Power supply failure | Check fuse F001, diodes D001-D004, IC001 |
| No audio output | Amplifier section | Check speaker relays, output transistors, protection circuit |
| Distorted audio | DC offset or bias | Adjust DC offset and bias current; check output devices |
| No digital audio | DSP circuit | Check digital input receivers, clock signals, DSP IC |
| Tuner not working | Tuner circuit | Check tuner power supply, alignment, antenna connection |
Reset Procedure: Power off, press TUNER PRESET + and - simultaneously, power on.
Complete list of replacement parts with manufacturer part numbers.
| Part Number | Description | Qty |
|---|---|---|
| 2SC5200 | Power transistor NPN | 10 |
| 2SA1943 | Power transistor PNP | 10 |
| IC001 | Power supply controller | 1 |
| IC201 | DSP processor | 1 |
| F001 | Main fuse 5A | 1 |
| RLY001 | Speaker relay | 2 |
Complete schematic diagrams for all circuit boards.
Note: Schematics are for reference. Actual values may vary slightly.
Printed circuit board layouts and component placement diagrams.
Essential safety information for service technicians.
WARNING! Lethal voltages present. Always disconnect AC power before servicing. Use isolation transformer when testing live circuits. Ensure proper grounding. Follow ESD precautions when handling semiconductors.
CAUTION! High temperatures on heatsinks. Allow to cool before handling. Use thermal compound when reassembling.
Important service information and common repair procedures.
| Issue | Service Note | Reference |
|---|---|---|
| Protection mode | Check output transistors and DC offset | Section 7 |
| Display issues | Check front panel power and data lines | Section 4 |
| Intermittent operation | Check solder joints on power supply | Section 3 |
| No digital audio | Verify optical receiver operation | Section 7 |
| Overheating | Check bias current and ventilation | Section 6 |
Service Support: Contact Marantz technical support for additional assistance.