The service manual for the Drake PS-7 power supply covers setup, operation, and troubleshooting, including instructions for adjusting output voltage and current, changing primary voltages, and ensuring proper cooling to prevent overheating. It also provides guidance on handling current overload and overvoltage protection, as well as instructions for replacing fuses and connecting to a linear amplifier.
Manual Overview
The Drake PS-7 power supply is a 13.6-volt DC regulated unit capable of delivering up to 25 amps of continuous current. It features excellent voltage regulation, short circuit, and overvoltage protection. Troubleshooting involves checking for current overload or short circuit conditions, which automatically shut down the regulator circuit. To reset, switch the TR-7 to OFF or remove the AC primary voltage. The power transformer is protected by an 8 amp MDL fuse for 100/120 VAC and a 4 amp MDL fuse for 200/240 VAC. Overvoltage protection is provided by an SCR crowbar that clamps the output to ground if the voltage exceeds 16 VDC. The PS-7 is factory set for 120 VAC operation, but primary input voltage can be adjusted by repositioning the programming plate and switches. Calibration and adjustments are made using internal controls set to provide 13.6 volts at up to 25 amps. For extended duty cycles, the optional FA-7 cooling fan is recommended. Board-level guidance includes replacing fuses with the same type and rating and ensuring proper ventilation to avoid overheating.
Quick Issues Covered
- Diagnose PS-7 power-up failures with voltage and current adjustments.
- Identify overvoltage protection issues causing automatic shutdown.
- Trace circuits using PS-7 schematic for short circuit diagnostics.
Overview
The PS-7 is a 13.6 volt DC regulated power supply capable of delivering up to 25 amps of continuous current. It features excellent voltage regulation, short circuit and overvoltage protection, and programmable primary voltages. The power supply includes an auxiliary 13.6 VDC output, internally fused at 1 amp. It supports primary voltages of 100, 120, 200, and 240 VAC, 50-60 Hz, which can be changed via programming switches. For demanding duty cycles, additional cooling with the model 1529 FA-7 Cooling Fan is recommended. The PS-7 also includes current overload protection, automatically shutting down in case of overload or short circuit, and overvoltage protection with an SCR crowbar. The unit is factory set for 120 VAC 50-60 Hz operation, but the input range can be adjusted. Factory service is available for a nominal fee, with transportation charges extra.
Specifications
- AC INPUT: 100, 120, 200, or 240 Volts AC, + 10% 50-60 HZ.
- DC OUTPUT: 13.6 Volts DC with less than 3mV RMS of ripple at 25 amperes load.
- DC CURRENT: 25 amperes continuous( at 25°C. ambient )
- DC AUX VOLTS: 13.6 VDC regulated.
- DC AUX CURRENT: 1 ampere maximum.
- CONNECTORS: Aux DC Phono Jack, ALC Phono Jack, VOX Contact, Fan AC, Ground Connection
- DIMENSIONS: Width—1334” (34.93 cm.), Height—5¥4” (13.34 cm.), Depth—12%” (31.75 cm.)
- WEIGHT: 321, Ibs. (15 kg)
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
The installation and setup of the PS-7 Power Supply require ensuring adequate clearance around the unit for proper air circulation, particularly around the heat sinks. It is important to avoid placing items such as books or papers on top of the unit to prevent overheating. The power supply is factory set for 120 VAC 50-60 Hz operation, but the primary input range can be changed by adjusting the programming plate and voltage switch. If operating at 200 or 240 VAC, a 4 ampere type MDL fuse must be used. The PS-7 also includes features like short circuit and overvoltage protection, and for demanding duty cycles, the use of the model 1529 FA-7 Cooling Fan is recommended, especially at ambient temperatures above 25°C.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Care should be taken to ensure that adequate clearance is provided around the PS-7 for proper circulation of air, especially around the heat sinks. Avoid placing books, papers, or other pieces of equipment on top of the unit as overheating could result.
Download 2 Service manual (PDF – 2.7 MB)
Drake PS-7 Model 2 manual: troubleshoot, calibrate, and service with detailed instructions. PDF size: 2.7 MB.
- Brand: Drake-ps-7-instruction-and-service-manual
- Model: 2
- Type: Service manual
- File size: 2.7 MB
Overview
Brief overview of the product.
Specifications
- Key spec 1
- Key spec 2
Controls & Indicators
Control panel/button layout.
Installation / Setup
- Step 1…
- Step 2…
Operation
Basic usage, modes, cycles.
Troubleshooting & Error Codes
| Issue / Code | Fix |
|---|---|
| Example | How to fix… |
Safety & Warnings
- Important warning…
Downloads
Download 2 service manual (PDF)
Drake-ps-7 Instruction and Service Manual Overview
The Drake-ps-7 is a precision power supply unit designed for use in various electronic and communication applications. It provides stable and adjustable DC voltage output, making it ideal for laboratory testing, amateur radio setups, and electronic repair work. This manual offers detailed instructions for operation, maintenance, and troubleshooting to ensure optimal performance and longevity of the device.
Main Features and Specifications
- Adjustable DC output voltage range: 0 to 13.8 volts
- Maximum current output: 7 amperes
- Built-in voltage and current meters for real-time monitoring
- Short circuit and overload protection
- Compact and durable metal chassis for enhanced heat dissipation
- Quiet operation with efficient cooling fan
- Input voltage: 120V AC, 60 Hz (check manual for other variants)
Basic Usage and Operation Tips
Before powering on the Drake-ps-7, ensure all connections are secure and the output voltage is set to the desired level. Use the voltage adjustment knob to fine-tune the output, and monitor the built-in meters to verify voltage and current levels. Always start with a lower voltage setting when powering new or unknown devices to prevent damage. Allow the unit to warm up for a few minutes to stabilize output before use.
Troubleshooting and Maintenance
If the power supply fails to turn on, check the AC input connection and fuse. In case of abnormal voltage readings or overheating, verify that the cooling fan is operational and that ventilation is not obstructed. Regularly clean dust from vents and internal components to maintain efficient cooling. For persistent issues, refer to the service section of the manual for detailed diagnostic procedures.
Safety Reminder
Always disconnect the Drake-ps-7 from the AC power source before performing any maintenance or internal inspection. Avoid contact with exposed terminals during operation to prevent electric shock. Use the device within the specified voltage and current limits to avoid damage or hazards. Follow all safety guidelines outlined in this manual to ensure safe and reliable operation.