The B&K Precision Model 470 manual provides detailed instructions for setting up, operating, and troubleshooting the CRT Tester/Rejuvenator, emphasizing safety precautions due to the high voltage involved. It covers the testing of cathode ray tubes for emission, leakage, and shorts, as well as restoring low-emission tubes and checking the life expectancy of the tubes, with a focus on reducing human error through a guided control panel.
Manual Overview
The B&K Precision Model 470 CRT Tester/Rejuvenator is designed for evaluating and restoring cathode ray tubes (CRTs) in televisions, monitors, and terminals. The manual emphasizes safety precautions due to the high voltages involved, advising technicians to disconnect power sources and treat all equipment as potentially hazardous. The device features a “Road Map” control panel that simplifies the testing process, reducing human error and testing time. It performs various tests including emission, leakage, and tracking, and offers functions for shorts removal, gun cleaning, and cathode rejuvenation. The rejuvenation process is automated and minimizes the risk of cathode damage. The manual provides detailed instructions for using the tester, with a focus on interpreting measurements accurately. Technicians are guided through setup and operation, with specific controls for adjusting heater and bias voltages, and selecting color gun settings. The manual also includes a troubleshooting flow for diagnosing issues and ensuring proper calibration and adjustments at the board level.
Quick Issues Covered
- Diagnoses CRT emission, leakage, and shorts issues.
- Guides through CRT restoration and rejuvenation processes.
- Provides setup charts for CRT testing and adjustments.
Overview
The Model 470 Cathode Ray Tube (CRT) Tester/Rejuvenator, designed by B & K-Precision, is a professional quality instrument intended for evaluating most television picture tubes, computer terminal displays, or other cathode ray tubes with high accuracy. It features a “Road Map” control panel design to reduce testing time and includes functions for rapid testing, emission measurement, leakage detection, color tracking, and rejuvenation of CRTs. The manual covers safety precautions, specifications, operation instructions, and servicing details for the Model 470.
Specifications
- TYPES OF CRT's TESTED: Most black & white, color, and projection TV picture tubes, video monitors, and computer terminal CRT's.
- TESTS PERFORMED: Emission, Leakage, Tracking (Color Tubes), Life.
- RESTORING FUNCTIONS: Shorts Removal, Gun Cleaning and Balancing, Cathode Rejuvenation.
- METER: (One; 4%", D'Arsonval movement.) Meter Indications Emission (0-2mA), Restoring Current (0-2 scale), Heater Voltage (0-15V), Gl Bias Voltage (0-100u), Leakage.
- TEST VOLTAGES: Heater: U7 @2.0A, 7-14 @600mA. Gl Bias: 0 to Neg. 100VDC. G2 Supply: G450VDC.
- ACCESSORIES: CRT Socket Adapters: 6 supplied; optional adapters available for all common TV picture tubes. Set-Up Chart: Shows adapter number and test voltages, condensed instructions.
- POWER REQUIREMENTS: 117VAC, 60Hz, 40 Watts.
- FUSE (INTERNAL): Type 3 AG, 0.3A Slo-Blo.
- CASE: High impact polyethylene, one-piece internal cord and adapter storage.
- SIZE: 13 1/2" x 10" x 5-3/4".
- WEIGHT: 7 lbs.
Controls & Indicators
The front-panel controls and indicators of the Model 470 CRT Tester/Rejuvenator include:
1. Function Selector Switch: Allows selection of various functions such as OFF, SET HEATER, HEATER LEAKAGE, G1 LEAKAGE, SET G1 LEAKAGE, SET G1 VOLTS, SET G2 CUTOFF, READ EMISSION, SET COLOR TRACKING, REMOVE SHORTS, CLEAN, BALANCE, and REJUVENATE.
2. Heater Range Switch: Provides coarse adjustment of heater voltage with ranges of 0-4, 4-7, 7-9, 8-11, 10-12, and 12-14 volts.
3. Heater Fine Adjustment: Allows a variable adjustment of ±2 volts.
4. G1 Voltage Adjustment: Adjustable from 0 to NEG. 100VDC.
5. Color Gun Selector Switch: Options for Red/B&W, Green, Blue.
6. Pilot Lamp: Indicates when the power is ON.
7. Meter: Displays indications for Heater Voltage, Leakage, G1 Volts, Emission, Tracking, Cleaning, Balancing, and Rejuvenation.
8. G2 Voltage Adjustments: Separate adjustments for Red/B&W, Green, and Blue, each from 0 to 450VDC.
9. Tracking Adjustment: Varies emission readings of all guns proportionally from zero to full value.
10. Restoring Pushbutton: Applies restoring voltage between G1 and cathode, and simultaneously interrupts heater voltage.
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
There is a certain amount of danger from electrical shock if this equipment is used improperly, or from contacting high voltage in the television set, video monitor, computer terminal, etc. in which the cathode ray tube being tested is installed. This instrument is intended for use only by qualified electronic technicians who are trained to work safely in the presence of high voltage. Be alert to the following hazards when using the Model 470 CRT Tester/Rejuvenator:
1. An electrical shock causing 10 milliamps of current to pass through the heart will stop most human heartbeats. Higher voltages pose a greater threat because they can more easily produce a lethal current. However, voltage as low as 35 volts DC or AC RMS should be considered dangerous and hazardous since it can produce a lethal current under certain conditions.
2. Many television sets and other devices with CRT’s are transformerless “hot chassis” powered, where one side of the AC power line is connected directly to the chassis. If such equipment does not have a polarized power plug to prevent insertion the “wrong” way, a serious shock hazard exists if the chassis is touched. Additionally, damage to the CRT tester/rejuvenator or the TV set could result. Unplug any “hot chassis” TV set from its AC outlet before attempting to access the CRT (just turning off the set does not eliminate the hazard). To be on the safe side, treat all equipment as “hot chassis” type unless you are sure it has a floating or earth ground chassis.
3. Discharge high voltage capacitors after power is removed from the equipment with the CRT. The anode of many CRT’s retains a high voltage charge for long periods after power is removed.
4. This instrument applies all the voltages required for testing and restoring CRT’s. Therefore, high voltages are present at the adapter socket during some tests. Keep your hands away from the adapter socket during tests. The 470 should be turned off while the adapter is being connected to the CRT.
Safety Precautions:
1. The proper power line supply voltage is indicated on the chassis where the power cord enters the instrument. Do not attempt to operate this instrument from a power source other than specified.
2. When testing any CRT that is installed in a chassis, first disconnect the chassis power plug from the AC line outlet. Do not apply power to the TV chassis at any time during the test of a CRT.
3. Read and observe the “Test Instrument Safety” recommendations on the inside front cover of this manual.
Download MANUAL Manual (PDF – 1.2 MB)
Bk-precision-470 manual: assists technicians in troubleshooting and calibrating the Bk-precision-470 model. File size: 1.2 MB.
- Brand: Bk-precision-470-instruction
- Model: MANUAL
- Type: Manual
- File size: 1.2 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
Bk-precision-470-instruction Overview
The Bk-precision-470-instruction is a versatile precision measuring instrument designed for accurate electrical testing and diagnostics. Ideal for both professional technicians and hobbyists, this device provides reliable measurements of voltage, current, resistance, and other key electrical parameters. Its robust build and intuitive interface make it suitable for a wide range of applications, including troubleshooting circuits, verifying component functionality, and performing routine maintenance on electrical systems.
Main Features and Specifications
- Model: Bk-precision-470
- High accuracy digital display with backlight
- Measures AC/DC voltage, current, and resistance
- Auto-ranging capability for ease of use
- Data hold and max/min recording functions
- Overload protection to safeguard the device
- Compact and ergonomic design for comfortable handling
- Battery-powered with low battery indicator
Basic Usage and Operation Tips
Before using the Bk-precision-470, ensure the device is properly calibrated and the battery is sufficiently charged. Select the appropriate measurement mode using the rotary switch, and connect the test leads securely to the device and the circuit under test. Always start with the highest range setting to prevent damage, then adjust downward for more precise readings. Use the data hold function to freeze readings for easier analysis. After completing measurements, turn off the device to conserve battery life.
Troubleshooting and Maintenance
If the device displays erratic readings or fails to power on, check the battery status and replace if necessary. Inspect test leads for damage or wear, as faulty leads can cause inaccurate measurements. Clean the exterior with a dry cloth and avoid exposure to moisture or extreme temperatures. For persistent issues, refer to the detailed troubleshooting section in the manual or contact authorized service centers.
Safety Reminder
Always observe proper safety precautions when using the Bk-precision-470. Avoid measuring voltages beyond the device’s specified limits and never touch exposed metal parts during operation. Use insulated test leads and wear appropriate personal protective equipment when working with live circuits. Disconnect power sources before performing maintenance or replacing batteries to prevent electric shock or device damage.