The service manual for the B&K-Precision Model 1640 Solid-State Regulated Power Supply provides detailed instructions on setup, operation, and troubleshooting, including safety precautions and specific steps for connecting and adjusting the unit to power mobile equipment. It covers features such as automatic delayed voltage shutdown, voltage and current metering, and overload protection, ensuring proper operation and maintenance of the power supply.
Manual Overview
The service manual for the B&K-Precision Model 1640 Solid-State Regulated Power Supply provides detailed guidance on troubleshooting, error diagnostics, calibration, and board-level adjustments. Troubleshooting involves monitoring the overload indicator, which lights up when the unit exceeds the 3.0A continuous current limit, causing an automatic shutdown. To reset, the power switch must be toggled off and then on again, ensuring the overload condition is resolved. Calibration is achieved through trimpots R1 and R5, which adjust the output voltage range from 10.5 VDC to 15 VDC. The manual emphasizes the importance of setting the correct voltage using the VOLTS control and monitoring current with the VOLTS/AMPS switch. The circuit theory section explains the voltage regulation process, highlighting the role of the zener diode D1 and operational amplifier IC1 in maintaining stable output. The manual also advises on safety precautions, such as using insulated floor coverings and avoiding contact with metallic objects to prevent electrical shock.
Quick Issues Covered
- Diagnose power-up failures with automatic delayed voltage shutdown feature.
- Error codes for overload indicated by lighted OVERLOAD INDICATOR.
- Circuit tracing with schematic for voltage regulator and feedback network.
Overview
The B&K-Precision Model 1640 Solid-State Regulated Power Supply is designed to power Citizens Band mobile radios, auto-radio/tape decks, marine radios, and related mobile equipment. It features high DC output current, automatic delayed voltage shutdown, lab-type voltage regulation, a wide-view illuminated voltmeter/ammeter, continuously variable output voltage, an LED overload indicator, and heavy-duty output binding posts. The manual covers general description and features, specifications, operating controls and indicators, operating instructions, circuit theory, maintenance, calibration, and warranty service instructions.
Specifications
- INPUT VOLTAGE: 117 VAC, 60Hz.
- DC OUTPUT VOLTS: Continuously variable from 11V to 15V.
- DC OUTPUT CURRENT: 0-3.0 amps continuous, 5 amps surge limited.
- METER: Voltmeter/Ammeter, pivot and jewel movement.
- VOLTMETER SCALE: 11V to 15.0V, 45% FS. 13.8V, ±2%.
- CURRENT SCALE: 0 to 3.0A, 42% FS.
- OUTPUT RIPPLE: Less than 8mV RMS; 0—3.0A.
- LOAD REGULATION: Less than .8% voltage change from 0 to 3.0A, 11V to 15.0V.
- LINE REGULATION: Less than .8% voltage change at 3.0A output, with ±10% line variation.
- SHORT CIRCUIT PROTECTION: Voltage shutdown, manual reset. Surge current limited to 5A maximum.
- DIMENSIONS: 3-1/16 H x 10” W x 9-1/2” D.
- WEIGHT: 8 lbs.
Controls & Indicators
The front-panel controls and indicators for the Model 1640 include:
1. Power On-Off/Reset switch: Turns on power and resets the unit when shutdown by overload.
2. Volts Control: Sets output voltage from 11V to 15 VDC.
3. Meter Lamp: Lights when the Model 1640 is turned on.
4. Volts/Amps Meter Switch: Selects volts or current mode for meter.
5. Meter: Meters output volts from 11V to 15 VDC and output current from 0 to 3.0A.
6. Overload Indicator: Glows after overload and turns off when overload is cleared.
7. Terminal: Chassis ground terminal, may be connected to either positive or negative output terminal.
8. Output terminals: Positive (+) and Negative (-) respectively.
Installation / Setup
The source does not provide specific information about installation or setup highlights such as wiring, clearances, calibration, or prerequisites.
Operation
To operate the Model 1640, first ensure safety by familiarizing yourself with the equipment and taking precautions against electrical shock. Begin by turning the VOLTS control to the full counterclockwise position to set the output voltage to the minimum. Connect the positive and negative terminals of the Model 1640 to the corresponding inputs of the equipment being powered. If grounding is required, make the necessary connections between the equipment and the Model 1640’s chassis ground terminal. Plug the power cord into a 117 volt, 60 Hz AC outlet and turn on the unit using the slide switch. Set the meter switch to VOLTS and adjust the VOLTS control to the desired voltage. The Model 1640 can supply a continuous current of up to 3.0 amperes and a surge current of 5 amperes for 40 milliseconds. If an overload occurs, the unit will shut down and the OVERLOAD INDICATOR will light up. To reset, toggle the OFF/RESET switch to OFF and back to ON once the overload is cleared.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
A certain amount of danger is always present when working on electrical equipment; therefore, the user is cautioned always to familiarize himself as much as possible with the equipment to be tested, before any work is performed. When testing high voltage circuits, develop the habit of keeping one hand in your pocket or behind your back to minimize the hazard of accidental shock. It is also important to have a properly insulated floor covering to stand on while taking measurements. Be particularly careful to avoid contacting nearby metallic objects which could provide a ground return path. A good practice is to remove operating power before connecting test leads.
Download MANUAL Service manual (PDF – 1.9 MB)
Bk-precision-1640-instruction-service manual: 1.9 MB PDF for troubleshooting and calibrating the Bk-precision 1640 model.
- Brand: Bk-precision-1640-instruction-service
- Model: MANUAL
- Type: Service manual
- File size: 1.9 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 MANUAL service manual (PDF)
Bk-precision-1640-instruction-service MANUAL – Service Manual Overview
The Bk-precision-1640 is a versatile digital multimeter designed for precise electrical measurements in both professional and hobbyist environments. This device offers accurate readings of voltage, current, resistance, and continuity, making it an essential tool for troubleshooting, testing, and servicing electronic circuits and components.
Main Features and Specifications
- Measurement Functions: AC/DC Voltage, AC/DC Current, Resistance, Continuity, Diode Test
- Display: Large backlit LCD with 4000 counts resolution
- Auto and Manual Ranging for flexible measurement options
- Data Hold and Relative Mode for convenient data analysis
- Overload Protection on all ranges to safeguard the device
- Low Battery Indicator to ensure reliable operation
- Compact and ergonomic design with a sturdy casing
Basic Usage and Operation Tips
Before starting measurements, ensure the multimeter is set to the correct function and range for your application. Always connect the test leads to the appropriate input jacks, and start with the highest range if unsure of the expected measurement value. Use the data hold feature to freeze readings for easier observation. When measuring current, never exceed the specified maximum input to avoid damage. Turn off the device after use to conserve battery life.
Troubleshooting and Maintenance
If the display shows erratic readings or no response, check the test leads for damage and replace batteries if the low battery indicator is active. Clean the device regularly with a soft, dry cloth and avoid exposure to moisture or extreme temperatures. If the multimeter fails to power on or shows persistent errors, refer to the service manual for detailed diagnostics or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1640 multimeter. Avoid measuring voltages or currents beyond the device’s rated limits. Use insulated test leads and keep fingers behind the protective barriers. Disconnect power sources before testing resistance or continuity to prevent electric shock or damage to the meter.