The Kenwood PS 50 is a professional-grade power supply unit designed for laboratory and industrial applications. This service manual provides comprehensive technical information including specifications, circuit diagrams, troubleshooting procedures, calibration instructions, and maintenance guidelines for qualified service technicians.
The Kenwood PS 50 power supply features precision voltage regulation, current limiting, and multiple output modes for versatile laboratory applications.
| Parameter | Specification |
|---|---|
| Output Voltage Range | 0-50V DC adjustable |
| Output Current Range | 0-5A DC adjustable |
| Line Regulation | ≤ 0.01% + 2mV |
| Load Regulation | ≤ 0.01% + 2mV |
| Ripple & Noise | ≤ 1mV RMS |
| Voltage Meter Accuracy | ±2% of full scale |
| Current Meter Accuracy | ±2% of full scale |
| Operating Temperature | 0°C to 40°C |
| Power Requirements | 100-240V AC, 50/60Hz |
| Dimensions | 215W × 130H × 280D mm |
Before servicing the Kenwood PS 50, observe all safety precautions to prevent injury and equipment damage.
WARNING! High voltages present inside the unit. Only qualified technicians should perform service procedures.
Proper installation ensures optimal performance and safety of the Kenwood PS 50 power supply.
CAUTION! Do not operate in confined spaces or near heat sources.
The Kenwood PS 50 employs a linear power supply design with series pass regulation for low noise operation.
Main Sections: Input rectifier/filter, reference voltage circuit, error amplifier, series pass transistors, current limiting circuit, metering circuit, and protection circuits.
Voltage Regulation: Uses precision reference IC and error amplifier to maintain stable output. Current Limiting: Monitors output current and reduces voltage when preset limit is exceeded. Protection: Includes over-temperature, over-current, and over-voltage protection circuits.
Refer to service manual pages 15-25 for complete schematic diagrams and block diagrams.
Note: All diagrams show signal flow and component relationships for troubleshooting.
Calibration ensures accurate voltage and current measurements.
Tip: Use calibrated test equipment with higher accuracy than unit specifications.
Regular maintenance ensures long-term reliability and performance.
| Interval | Maintenance Task |
|---|---|
| Monthly | Clean exterior and ventilation openings |
| 6 Months | Check calibration accuracy |
| Annually | Internal inspection and cleaning |
| 2 Years | Complete calibration and performance verification |
| As Needed | Replace worn components and test safety features |
Genuine Kenwood replacement parts ensure proper operation and safety.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No output voltage | Blown fuse, faulty power switch | Check/replace fuse; verify switch operation |
| Inaccurate voltage reading | Calibration drift, meter fault | Recalibrate; check meter circuit |
| Excessive ripple | Failed filter capacitors | Replace main filter capacitors |
| Overheating | Blocked ventilation, faulty fan | Clean vents; check fan operation |
| Current limiting not working | Current sense circuit fault | Check current sensing resistors and op-amps |
Service Contact: Authorized Kenwood Service Centers only.
Technical Support: Contact Kenwood technical support for complex issues.