The service manual for the 15MHz Triggered Sweep Dual-Trace Oscilloscope covers setup, operation, and troubleshooting, including operator controls, indicators, and facilities, as well as circuit descriptions and adjustments. It provides detailed information on the differences between models 1472C and 1477, schematic diagrams, parts lists, and safety warnings regarding high voltage exposure.
Manual Overview
The service manual for the Bk MANUAL dual-trace oscilloscope models 1472C and 1477 provides detailed guidance for qualified electronics technicians. It emphasizes caution due to the presence of high voltage, which can reach up to 2000 VDC on the CRT and power supply board during operation. The manual includes separate schematics for each model, with model 1477 featuring some physical differences such as a new front panel and knobs. Troubleshooting guidance is detailed, focusing on identifying and resolving issues through a systematic flow. Error codes and diagnostics are not explicitly mentioned, but the manual provides instructions for calibration and adjustments, particularly for the vertical amplifier attenuators and frequency compensation of probes. Board-level guidance includes circuit board maps and voltage measurements, aiding in precise servicing and repairs. The manual also contains a parts list and schematic diagrams for both models, ensuring technicians have comprehensive resources for maintenance and troubleshooting tasks.
Quick Issues Covered
- Diagnose power-up failures with high voltage checks on CRT board.
- Calibrate vertical amplifier using 1 kHz, 1V P-P square wave input.
- Trace circuits with model-specific schematic diagrams for 1472C and 1477.
Overview
The service manual covers the 1472C and 1477 models of a 15MHz Triggered Sweep Dual-Trace Oscilloscope. It is intended for qualified electronics technicians due to the presence of high voltage, which poses a risk of electric shock. The manual includes differences between the models, operator’s controls, specifications, circuit descriptions, servicing, troubleshooting, adjustments, parts lists, circuit board maps, voltage measurements, and schematic diagrams. Model 1477 has several appearance changes from Model 1472C, with specific parts listed separately.
Specifications
Refer to the PDF for details.
Controls & Indicators
Cathode Ray Tube (CRT): The screen for viewing waveforms.
Scale: 8 x 10 cm graticule for voltage and time measurements, with adjustable illumination.
POWER ILLUM control: Turns oscilloscope on/off and adjusts scale illumination.
Pilot lamp: Indicates when oscilloscope is on.
SWEEP TIME/CM switch: Selects horizontal coarse sweep time in 19 steps; disables internal sweep generator in CH B position.
Sweep speed VARIABLE control: Fine sweep time adjustment; calibrated in extreme clockwise position.
CAL 1V P-P jack: Provides calibrated 1 kHz, 1 volt peak-to-peak square wave input signal for calibration.
POSITION control: Adjusts horizontal position of traces; 5X magnification when pulled out.
TRIGGERING LEVEL control: Sync level adjustment; automatic triggering when pulled out.
EXT TRIG jack: Input for external trigger signal.
SYNC switch: Four-position lever switch for waveform viewing; includes SLOPE and TV positions.
SOURCE switch: Three-position lever switch for selecting triggering source.
Channel B POSITION control: Vertical position adjustment for Channel B trace.
Channel B DC BAL adjustment: Vertical DC balance adjustment for Channel B trace.
Channel B INPUT Jack: Vertical input jack for Channel B; becomes external horizontal input in CH B position.
Channel B DC-GND-AC switch: Direct input, grounds input, or blocks DC component.
Channel B VOLTS/CM switch: Vertical attenuator for Channel B; adjusts vertical sensitivity.
Channel B VARIABLE control: Fine control of vertical sensitivity; becomes horizontal gain control in CH B position.
MODE switch: Five-position lever switch for selecting oscilloscope operating modes.
Installation / Setup
Refer to the PDF for details.
Operation
Refer to the PDF for details.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
This service manual is intended for use by qualified electronics technicians only. To avoid electric shock, do not perform servicing unless you are qualified to do so. High voltage up to 2000 VDC is present on the CRT and power supply board when the oscilloscope is operating. High voltage up to 195 VDC is present on the sweep board. Line voltage of 120 VAC (or 240 VAC) is present on the power transformer, on-off switch, and power supply board any time the oscilloscope is connected to an AC power source, even if turned off. Always observe caution when the housing is removed from the unit. Contacting exposed high voltage could result in fatal electric shock.
Download MANUAL Service manual (PDF – 4.0 MB)
Bk-precision-1472c-service manual: 4.0 MB PDF for troubleshooting and calibrating the 1472C model.
- Brand: Bk-precision-1472c-service
- Model: MANUAL
- Type: Service manual
- File size: 4.0 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-1472c-service MANUAL Overview
The Bk-precision-1472c is a versatile digital multimeter designed for precise electrical measurements in both professional and hobbyist environments. This device offers reliable performance for testing voltage, current, resistance, and continuity, making it an essential tool for troubleshooting and maintaining electrical circuits.
Main Features and Specifications
- Measurement Functions: AC/DC voltage, AC/DC current, resistance, continuity, diode test
- Display: Large backlit LCD for clear readings in various lighting conditions
- Accuracy: High precision measurement with auto-ranging capability
- Safety Ratings: CAT II 600V, CAT III 300V rated for safe use in various electrical environments
- Additional Features: Data hold, relative mode, and low battery indicator
- Power Source: 9V battery with low power consumption
Basic Usage and Operation Tips
Before using the Bk-precision-1472c, ensure the battery is properly installed and the device is calibrated. Select the appropriate measurement mode using the rotary switch. When measuring voltage or current, connect the test leads to the correct input terminals and observe polarity. Use the data hold function to freeze readings for easier analysis. Always start with the highest range if the expected measurement is unknown to prevent damage to the meter.
Troubleshooting and Maintenance
If the display is dim or the readings are unstable, check the battery and replace it if necessary. Clean the test leads and input terminals regularly to maintain accurate measurements. Avoid exposing the device to moisture or extreme temperatures. In case of persistent errors or malfunction, refer to the service manual for detailed diagnostic procedures or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-1472c. Do not exceed the specified voltage and current limits. Use insulated test leads and avoid contact with live circuits. Disconnect power before changing measurement settings or test leads. Proper handling and adherence to safety guidelines will ensure reliable operation and prevent injury or equipment damage.