The Marantz 6150 is a high-quality stereo turntable featuring belt-drive system, manual operation, anti-skate adjustment, variable pitch control, S-shaped tonearm, and precision motor. This service manual provides detailed technical information for service technicians, including schematics, alignment procedures, troubleshooting, and maintenance guidelines for the Marantz 6150 turntable system.
Detailed technical specifications for the Marantz 6150 turntable system.
| Parameter | Specification |
|---|---|
| Type | Belt-drive manual turntable |
| Motor | 4-pole synchronous motor |
| Speeds | 33-1/3, 45, 78 RPM |
| Wow & Flutter | ≤0.08% WRMS |
| Signal-to-Noise Ratio | ≥65 dB |
| Tonearm Type | S-shaped static balance |
| Effective Length | 222 mm |
| Overhang | 15 mm |
| Tracking Force Range | 0-3 grams |
| Power Requirements | 120V AC, 60Hz |
Detailed breakdown of mechanical components and their functions.
WARNING! Handle mechanical components with care to avoid misalignment. Use proper tools for disassembly.
Complete electrical schematics and wiring diagrams.
CAUTION! Disconnect power before servicing electrical components. Use appropriate safety equipment.
Precision alignment procedures for optimal performance.
Tools Required: Alignment protractor, stylus force gauge, strobe disc, screwdrivers
Tonearm: Set vertical tracking force, anti-skate, cartridge alignment. Motor: Speed calibration using strobe. Platter: Height and level adjustment. Bearings: Lubrication and play adjustment.
Motor specifications and drive system maintenance.
Tip: Clean pulley and inner platter rim with isopropyl alcohol during belt replacement.
Complete tonearm service and adjustment procedures.
WARNING! Handle tonearm bearings with extreme care. Avoid overtightening during reassembly.
Electronic component testing and replacement guidelines.
Power Supply: Test transformer outputs, bridge rectifier, filter capacitors. Motor Circuit: Check motor windings, speed control potentiometers. Strobe Circuit: Verify neon lamp operation and power supply.
Complete parts listing with manufacturer part numbers.
| Part Number | Description | Qty |
|---|---|---|
| M6150-001 | Main Platter Assembly | 1 |
| M6150-002 | Drive Belt | 1 |
| M6150-003 | Tonearm Complete | 1 |
| M6150-004 | Motor Assembly | 1 |
| M6150-005 | Main Circuit Board | 1 |
| M6150-006 | Dust Cover | 1 |
| M6150-007 | Hinge Set | 1 pair |
Performance verification and testing protocols.
| Test | Procedure | Acceptance Criteria |
|---|---|---|
| Speed Accuracy | Use strobe disc and timer | ±0.5% of nominal speed |
| Wow & Flutter | Test record and meter | ≤0.08% WRMS |
| Rumble | Unweighted measurement | ≥65 dB |
| Tracking Force | Digital force gauge | Accurate to ±0.1g |
| Anti-skate | Test record method | Matches tracking force |
Reset: Recalibrate all adjustments after service.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Motor not running | Power supply, belt, motor | Check power, test motor, replace belt |
| Incorrect speed | Belt, pulley, control circuit | Clean pulley, adjust speed control, replace belt |
| Excessive rumble | Motor bearings, platter bearing | Lubricate bearings, check motor mounts |
| Tonearm drift | Anti-skate, leveling | Adjust anti-skate, level turntable |
| No audio output | Cartridge, wiring, cables | Check cartridge, tonearm wiring, RCA cables |
Service Contact: Authorized Marantz service centers only. Use genuine Marantz parts.