The Marantz CD 52 MKII is a high-quality CD player featuring advanced digital audio technology, precision laser mechanism, high-resolution digital-to-analog conversion, remote control operation, multiple output options, and robust construction. This service manual provides comprehensive technical information for service technicians, including schematics, alignment procedures, troubleshooting guides, and replacement parts information.
Complete technical specifications for the Marantz CD 52 MKII CD player system.
| Parameter | Specification |
|---|---|
| Audio Channels | 2 (Stereo) |
| Frequency Response | 20Hz - 20kHz ±0.5dB |
| Signal-to-Noise Ratio | >100dB |
| Dynamic Range | >95dB |
| Total Harmonic Distortion | <0.005% |
| Channel Separation | >90dB at 1kHz |
| Output Voltage | 2.0V RMS |
| Digital Output | Coaxial, Optical |
| Power Requirements | 220-240V AC, 50/60Hz |
| Power Consumption | 15W |
| Dimensions (WxHxD) | 440 x 95 x 310 mm |
| Weight | 5.2 kg |
System block diagram showing signal flow and major components.
NOTE: Refer to schematic diagrams for detailed circuit connections.
Step-by-step disassembly procedure for service access.
WARNING! Always discharge capacitors before working on power supply section.
Factory alignment procedures and test points.
Required Test Equipment: Oscilloscope, audio analyzer, test CD, digital voltmeter
RF Level Adjustment: Adjust VR101 for 1.2Vp-p RF signal at TP101
Focus Gain: Adjust VR102 for optimal focus servo response
Tracking Gain: Adjust VR103 for stable tracking
PLL Adjustment: Set VC101 for 4.3218MHz at TP102
Output Level: Verify 2.0V RMS at outputs with 0dB test signal
CAUTION! Use factory test CDs and follow procedures exactly.
Common symptoms and diagnostic procedures.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No disc recognition | Laser pickup, RF amp | Check RF waveform; replace pickup if <0.8Vp-p |
| Disc spins but no audio | Digital processor, D/A converter | Check LRCK, DATA, BCK signals; verify D/A operation |
| Intermittent playback | Servo circuits, power supply | Monitor servo error signals; check power supply voltages |
| No display | Microcontroller, display driver | Check +5V supply; verify microcontroller operation |
| Hum in audio | Ground loops, power supply | Check grounding; verify power supply filtering |
| Remote control not working | Remote sensor, microcontroller | Test remote sensor output; check microcontroller IR input |
Critical replacement parts and components.
| Part Number | Description | Qty |
|---|---|---|
| KSS-240A | Laser Pickup Assembly | 1 |
| CXA1372Q | Servo Signal Processor | 1 |
| CXD2500BQ | Digital Signal Processor | 1 |
| SM5872BM | D/A Converter | 1 |
| NJM4558 | Dual Operational Amplifier | 2 |
| HD6433256F10 | Microcontroller | 1 |
| LA6531 | Motor Driver IC | 1 |
| PS-152 | Power Transformer | 1 |
NOTE: Always use genuine Marantz replacement parts.
Complete circuit schematics for all sections.
Tip: Refer to schematic diagrams for component values and test points.
Printed circuit board layouts and component locations.
CAUTION! Handle PCBs carefully to avoid damage to traces.
Important service tips and modifications.
WARNING! Laser products are classified as Class 1 laser devices.
Essential safety information for service personnel.
| Hazard | Precaution |
|---|---|
| Electric Shock | Disconnect power before servicing; discharge capacitors |
| Laser Radiation | Do not expose eyes to laser beam; follow laser safety procedures |
| Heat Damage | Allow unit to cool before handling; use heat sinks when soldering |
| Component Damage | Use proper tools; avoid static discharge; follow ESD procedures |
| Mechanical Injury | Watch for sharp edges; secure unit during service |
Service Support: Contact Marantz technical support for complex issues.