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General| Brand | Changhong Electric |
|---|---|
| Model | 21NF55 |
| Category | TV |
| Language | English |
Precautions regarding X-ray radiation from CRT.
General safety precautions for service personnel.
Important safety notice for product operation and servicing.
Explanation of safety symbols used in the manual.
Adjustments required after realignment or new picture tube installation.
Procedure for adjusting color purity using raster signals.
Procedure for adjusting color convergence using dot patterns.
Manual adjustment for white balance, potentially requiring special equipment.
Procedure to demagnetize the TV for color distortion correction.
Adjusting the +B voltage for X-ray radiation prevention.
Measuring CRT high voltage and heater voltage.
Adjusting the picture sharpness by rotating the FCB knob.
Performing insulation and voltage-resistant tests.
How to enter and use the service mode for adjustments.
Diagram showing the overall structure and signal flow of the TV.
Diagram illustrating the TV's power supply voltage distribution.
General overview of the EX-1A1 chassis and its key ICs.
Technical specifications for important integrated circuits.
Key features of the STR-G5653/F6654 power module.
Block diagram of the STR-G5653/F6654 power supply.
Pin details and functions for STR-G5653 and STR-F6654.
Comparison of STR-G5653 and STR-F6654 models.
Importance of replacing safety-related components with identical ones.
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