The Marantz PMD201 is a professional portable cassette recorder designed for field recording and broadcast applications. This service manual provides comprehensive technical information for qualified service personnel, including specifications, circuit descriptions, alignment procedures, troubleshooting guides, and replacement parts lists. Below are key sections covering technical specifications, block diagrams, adjustment procedures, and maintenance information.
Complete technical specifications for the Marantz PMD201 professional cassette recorder.
| Parameter | Specification |
|---|---|
| Frequency Response | 40Hz - 14kHz (±3dB) |
| Signal-to-Noise Ratio | Better than 50dB |
| Wow and Flutter | Less than 0.15% WRMS |
| Input Sensitivity | MIC: 0.5mV, LINE: 100mV |
| Output Level | LINE: 0.5V, PHONES: 10mW |
| Power Supply | 6V DC (4 x AA batteries) or AC adapter |
| Battery Life | Approximately 6 hours (alkaline) |
| Dimensions | 180 x 105 x 45 mm |
| Weight | 650g (without batteries) |
| Operating Temperature | 5°C to 40°C |
System block diagrams showing signal flow and power distribution.
WARNING! Service should only be performed by qualified technicians with proper test equipment.
Detailed descriptions of major circuit sections and their functions.
CAUTION! Always disconnect power before servicing internal circuits.
Required test equipment and adjustment procedures for optimal performance.
Test Equipment Required: Audio generator, oscilloscope, wow/flutter meter, distortion analyzer, DC power supply.
Playback Level Adjustment: Adjust PB LEVEL trimmer for specified output. Recording Bias Adjustment: Set bias current for minimum distortion. Head Azimuth Alignment: Adjust for maximum high frequency response. Motor Speed Adjustment: Set capstan speed for correct pitch.
Step-by-step alignment procedures for proper recorder operation.
Tip: Use manufacturer's alignment tapes for accurate calibration.
Common symptoms, probable causes, and corrective actions.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Batteries/connector | Check battery polarity; inspect DC jack; verify power switch. |
| No sound playback | Head/amplifier | Clean tape head; check playback amplifier IC; verify head connections. |
| Poor recording | Bias/head | Adjust recording bias; demagnetize head; check recording switch. |
| Speed variation | Motor/belt | Check motor voltage; replace drive belt; clean capstan shaft. |
| Mechanical jam | Transport mechanism | Inspect mode switch; check control linkage; lubricate moving parts. |
Complete listing of replacement parts with manufacturer part numbers.
| Part Number | Description | Quantity |
|---|---|---|
| PMD201-001 | Main PCB Assembly | 1 |
| PMD201-002 | Record/Playback Head | 1 |
| PMD201-003 | Capstan Motor | 1 |
| PMD201-004 | Drive Belt | 1 |
| PMD201-005 | Function Switch | 1 |
| PMD201-006 | Power Jack | 1 |
| PMD201-007 | Battery Contacts | 4 |
Mechanical exploded views showing component relationships and assembly order.
WARNING! Note screw lengths and positions during reassembly.
Important safety information for service personnel.
Always disconnect power before servicing. Use insulated tools when working on live circuits. Replace safety critical components with identical parts. Observe ESD precautions when handling semiconductors. Verify correct reassembly before applying power.
Complete circuit schematics for troubleshooting and analysis.
Service Support: For technical assistance, contact authorized Marantz service centers.