The Marantz PM 35 is a high-quality stereo integrated amplifier featuring advanced audio circuitry, multiple input options, and robust construction. This service manual provides comprehensive technical information for qualified service personnel, including schematics, alignment procedures, parts lists, and troubleshooting guidelines for proper maintenance and repair of the amplifier.
Complete electrical and mechanical specifications for the Marantz PM 35 integrated amplifier.
| Parameter | Specification |
|---|---|
| Power Output | xx Watts per channel (xx Ohms) |
| Total Harmonic Distortion | <0.xx% (xx Hz - xx kHz) |
| Frequency Response | xx Hz - xx kHz (+0/-x dB) |
| Input Sensitivity | xx mV (PHONO), xx mV (LINE) |
| Signal-to-Noise Ratio | >xx dB (PHONO), >xx dB (LINE) |
| Input Impedance | xx kOhms (PHONO), xx kOhms (LINE) |
| Damping Factor | >xx (xx Ohms) |
| Power Consumption | xx Watts (max) |
| Dimensions (W x H x D) | xxx x xx x xx mm |
| Weight | xx kg |
Detailed explanation of the amplifier's functional blocks and circuit operation.
WARNING! High voltages present in power supply section. Exercise extreme caution when servicing.
Step-by-step procedure for accessing internal components.
CAUTION! Handle circuit boards by edges to prevent electrostatic damage.
Complete circuit schematics for all sections of the amplifier.
Main Schematic: Power amplifier, preamplifier, and power supply circuits
Sub-schematics: Tone control, input selector, protection circuits
All component values and reference designators clearly marked. Signal flow indicated with arrows. Test points and adjustment points clearly identified.
Comprehensive listing of all components with manufacturer part numbers.
| Reference | Description | Part Number | Qty |
|---|---|---|---|
| R101 | Resistor xx Ohm xx Watt | MAR-xxxxx | 1 |
| C205 | Capacitor xx uF xx V | MAR-xxxxx | 1 |
| Q301 | Transistor NPN | 2SCxxxx | 2 |
| IC401 | Integrated Circuit | NJMxxxx | 1 |
| F101 | Fuse xxA | MAR-xxxxx | 1 |
Exploded mechanical views showing assembly sequence and hardware locations.
Detailed printed circuit board layouts for all boards.
Tip: Use exact replacement components to maintain performance specifications.
Systematic approach to diagnosing and repairing common issues.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Fuse, power switch, transformer | Check F101, measure primary voltage, test power switch |
| Distorted output | Bias current, output transistors | Adjust bias current, test output devices, check driver stage |
| Hum/buzz | Grounding, filter capacitors | Check ground connections, test main filter capacitors |
| One channel dead | Protection circuit, amplifier stage | Check protection relay, measure DC offset, test signal path |
| Intermittent operation | Cold solder joints, connectors | Inspect solder joints, clean and reseat connectors |
Essential safety information for service personnel.
WARNING! Line voltages present even when unit is switched off. Always disconnect from mains before servicing. Large filter capacitors retain dangerous charge - discharge before handling.
Use isolation transformer when testing live circuits. Follow ESD precautions when handling semiconductors.
Important service information and common repair procedures.
Factory service bulletins and updates. Common failure modes and recommended replacement parts. Alignment procedures requiring special test equipment. Warranty service procedures and documentation requirements.
Service Contact: Authorized Marantz service centers only. Use genuine Marantz replacement parts.