The Marantz CDA 94 is a high-end CD player featuring advanced digital-to-analog conversion technology, dual differential DAC configuration, HDAM modules, optical and coaxial digital outputs, balanced XLR outputs, remote control operation, and comprehensive service adjustments. This service manual provides detailed technical information for qualified service personnel including schematics, alignment procedures, parts lists, and troubleshooting guides.
Detailed technical specifications and performance characteristics of the Marantz CDA 94 CD player.
| Parameter | Specification |
|---|---|
| Frequency Response | 2Hz - 20kHz (±0.3dB) |
| Signal-to-Noise Ratio | >110dB |
| Dynamic Range | >100dB |
| Total Harmonic Distortion | <0.002% |
| Channel Separation | >100dB (1kHz) |
| Output Level | 2.0V RMS (RCA), 4.0V RMS (XLR) |
| Digital Output | Optical & Coaxial (0.5Vp-p/75Ω) |
| Power Requirements | 120V/230V AC, 50/60Hz |
| Power Consumption | 25W |
| Dimensions (W×H×D) | 458×121×377mm |
| Weight | 12.5kg |
System block diagrams showing signal flow and major functional blocks.
WARNING! For qualified service personnel only. High voltages present in power supply section.
Detailed circuit operation descriptions for each major section.
CAUTION! Static sensitive components. Use proper ESD protection.
Factory alignment procedures and test equipment requirements.
Required Equipment: Audio analyzer, oscilloscope, digital voltmeter, test CDs.
RF Amplitude: Adjust for 1.2Vp-p at TP-RF. Focus Gain: Optimize for stable tracking. Tracking Gain: Adjust for minimum jitter. Output Level: Set for 2.0V RMS at 0dB. DC Offset: Adjust for <2mV at outputs.
Critical test points and expected voltage/waveform measurements.
| Test Point | Measurement | Normal Value |
|---|---|---|
| TP-RF | RF Eye Pattern | 1.0-1.4Vp-p |
| TP-FEO | Focus Error | ±2.5V swing |
| TP-TEO | Tracking Error | ±2.5V swing |
| +5V Digital | DC Voltage | 5.0V ±5% |
| ±12V Analog | DC Voltage | ±12V ±5% |
| +8V Display | DC Voltage | 8.0V ±5% |
Systematic troubleshooting procedures for common faults.
Tip: Always verify power supply voltages before proceeding with other diagnostics.
Complete parts list with manufacturer part numbers and exploded assembly diagrams.
Major Components: KSS-240A Laser Pickup, CXD2500AQ DSP, PCM1702 DAC×2, HDAM Modules, Power Transformer, Main Microprocessor, Display Assembly, Transport Mechanism.
WARNING! Use only genuine Marantz replacement parts for optimal performance.
Printed circuit board layouts for all major boards.
Complete schematic diagrams for all circuit sections.
Main Board Schematic, Power Supply Schematic, Display/Control Schematic, Analog Audio Board Schematic, Transport Control Schematic.
| Issue | Description | Solution |
|---|---|---|
| Intermittent Play | Disc plays then stops randomly | Replace laser pickup assembly; check servo adjustments |
| No Display | All segments dark | Check +8V supply to display; replace display driver IC |
| Hum in Audio | Audible hum in both channels | Check ground connections; replace filter capacitors in power supply |
| No Digital Output | No signal from optical/coaxial | Check digital output IC; verify +5V supply |
| Transport Noise | Mechanical noise during operation | Lubricate sliding mechanisms; check gear alignment |
Factory Reset: Specific service mode entry procedure for microprocessor reset.
Service Support: Contact authorized Marantz service centers for technical assistance.