The B&K Model 1246 Digital IC Color Generator manual provides detailed instructions for setting up and operating the device, including controls for color adjustments, pattern selection, and RF output settings. It also includes troubleshooting guidance for convergence, deflection system tests, and calibration to ensure optimal performance in adjusting color TV sets.
Manual Overview
The B&K Model 1246 Digital IC Color Generator manual provides detailed guidance for technicians on troubleshooting, error diagnostics, calibration, and board-level adjustments. The troubleshooting flow involves using the nine programmed patterns to address issues with convergence and color alignment. These patterns include purity, dots, crosshatch, and color bars, each serving specific functions such as static and dynamic convergence, linearity, and size adjustments. Error diagnostics are facilitated by the crystal-controlled RF channels and the 4.5 MHz tuning aid, ensuring precise frequency settings. Calibration procedures are outlined for dot size, RF oscillator/modulator, and color oscillator/bar width, allowing technicians to maintain optimal performance. The manual emphasizes the use of the chroma level control for adjusting color saturation and the pattern selector for selecting the appropriate test pattern. Additionally, the manual provides guidance on using the red, blue, and green gun killers for specific color tests. The unit’s compact design and robust performance in varying temperatures make it a reliable tool for color TV adjustments.
Quick Issues Covered
- Diagnose power-up failures with internal transformer isolation checks.
- Calibrate dot size and vertical line width for optimal display.
- Use schematics for circuit tracing and RF output diagnostics.
Overview
The B & K Model 1246 Digital IC Color Generator is a portable device designed for the quick and easy convergence and adjustment of color TV sets. It uses integrated circuit (IC) flip-flops to ensure jitter-free patterns and eliminate pattern flicker, even under severe temperature and voltage variations. The generator provides multiple dot and crosshatch patterns for adjusting horizontal/vertical linearity, centering, and size on both color and black and white TV receivers. It features two crystal-controlled, keyed rainbow color displays for testing color circuits and aligning color demodulators. The unit is compact, easy to set up, and maintains frequency accuracy with two crystal-controlled RF channels and a 4.5 MHz fine-tuning aid. It includes red, blue, and green gun killers for convenient CRT gun adjustments. The manual covers specifications, operating procedures, convergence, color adjustments, deflection system tests, theory of operation, and calibration and maintenance.
Specifications
- PATTERNS (9 total)
- PURITY: Clear raster
- DOTS: 1, Center, 9×9
- CROSSHATCH: 1 x 1 Crosshair, 1×9, 9×1, 9×9
- COLOR BARS: Gated Rainbow: 10 bars at 30° intervals from burst; R-Y, B-Y, —(R-Y): 3 bars gated at 90°, 180°, and 270° from burst
- LINE WIDTH
- HORIZONTAL: 1 horizontal line (54 »S)
- VERTICAL: Preset to .25 »S; internally adjustable from .1 to .8 HS
- CHROMA
- Offset subcarrier system utilizing a frequency of 3.579545 MHz—1 H (15,816H7z) or 3.563729 MHz, + .001%. 10 bars and R-Y, B-Y, — (R-Y) are produced by gating with 189 KHz and 63 KHz respectively. The subcarrier level is adjustable from 0 to 200%, by front panel control adjustment.
- SIGNAL SYNTHESIS
- Progressive scan system utilizing digital binary logic elements to derive all sync and video information. The countdown chain is synchronized to a crystal controlled frequency of 189.800 KHz, + .005%. The composite video signal approximates TV standards.
- Sync (H=63.22,S) FREQUENCY PULSE WIDTH
- HORIZONTAL: 15,816 Hz, 0.08 H (5.4 S)
- VERTICAL: 59.91 Hz, 4H (253 »S)
- BLANK "Toran Front Porch REAR Porch
- HORIZONTAL: 0.145 H (9.2 uS), 0.06 H (3.8 »S)
- VERTICAL: 16H (1012 pS), 4H (253 wS), 8H (506 pS)
- RF OUTPUT
- CHANNELS: Crystal Controlled on 3 (61.25 MHz) and 4 (67.25 MHz) +.005%. Selectable by front panel slide switch.
- LEVEL: 10,000 Volts typical into a 3009 load.
- TUNING AID: 4.5 MHz unmodulated carrier + .2%. Fixed injection level of 30% of total modulation excursion.
- POWER REQUIREMENTS
- 100 to 130 Volts AC, 50/60 Hz. Internal power supply is transformer isolated, full-wave rectified and transistor-zener regulated to provide a constant and ripple-free supply voltage.
- OPERATING RANGE
- From —20° F to +140° F with no performance degradation.
- MECHANICAL
- SIZE: 2.257 x 7% x 10.375”
- WEIGHT: 3.5 Ibs.
- CABLE STORAGE: 30 cubic inches
- ADDITIONAL
- Red, blue and green front panel gun killer switches with 4 ft. cable.
Controls & Indicators
Refer to the PDF for details.
Installation / Setup
Refer to the PDF for details.
Operation
The 1246 has 2 controls and 5 slide switches, all located on the front panel.
1. CHROMA LEVEL: This control adjusts the color sub-carrier amplitude from 0 to 200%. At the midpoint, the level is normal or 100% of sync amplitude. In the extreme counter-clockwise position, AC power to the unit is switched off.
2. PATTERN SELECTOR: Nine patterns are programmed into the 1246 for convergence and color alignment. These include:
– Sync and a clear raster for purity adjustments.
– 9×9 dots for static convergence.
– A single center dot for verifying location.
– 9×9 crosshatch for dynamic convergence, linearity, size, and overscan adjustments.
– Single horizontal line with full vertical lines for dynamic convergence at screen center on left and right sides.
– Single vertical line with full horizontal lines for dynamic convergence at screen center on top and bottom.
– Crosshair for “roughing in” static convergence.
– 10 color bars for testing and aligning color circuitry.
– 3 color bars for expediting certain color alignment procedures.
RF SWITCHES and OUTPUTS: The 1246 delivers 10,000 Volts of well-modulated RF into a 3000 load.
Troubleshooting & Error Codes
Refer to the PDF for details.
Safety & Warnings
Refer to the PDF for details.
Download MANUAL Manual (PDF – 1.9 MB)
Bk-precision-1246-instruction manual: troubleshoot, calibrate, and operate the model 1246 efficiently. File size: 1.9 MB.
- Brand: Bk-precision-1246-instruction
- Model: MANUAL
- Type: 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
Bk-precision-1246-instruction Manual Overview
The Bk-precision-1246 is a versatile digital multimeter designed for accurate 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
- True RMS measurement for accurate AC readings
- Wide measurement range: up to 600V AC/DC voltage
- Resistance measurement up to 40MΩ
- Capacitance and frequency measurement capabilities
- Backlit LCD display for easy reading in low light
- Auto-ranging function for simplified operation
- Data hold and relative measurement modes
- Overload protection on all ranges
- Compact and ergonomic design with a protective rubber holster
Basic Usage and Operation Tips
Before using the Bk-precision-1246, ensure the device is powered on and the test leads are properly connected. Select the desired measurement mode using the rotary switch. For voltage measurements, connect the leads in parallel with the circuit, and for current measurements, connect them in series. Use the data hold function to freeze readings for easier documentation. Always start with the highest range if unsure of the measurement value to prevent damage to the meter.
Troubleshooting and Maintenance
If the display shows “OL” or overload, reduce the measurement range or check the test lead connections. Replace the batteries promptly when the low battery indicator appears to maintain accurate readings. Clean the device regularly with a dry cloth and avoid exposure to moisture or extreme temperatures. Store the multimeter in its protective case when not in use to prevent damage.
Safety Reminder
Always follow standard electrical safety procedures when using the Bk-precision-1246. Avoid measuring voltages exceeding the device’s rated limits. Use caution when working with high voltages or live circuits to prevent electric shock or injury. Never operate the multimeter with damaged test leads or casing.