The simplified circuit diagram of the TPV S569P color display line output is shown in the image below (the dashed lines indicate missing components in the circuit). This device uses a reverse polarity excitation method where, during operation, when the row excitation transistor V402 is turned on, the output transistor V403 is turned off, and vice versa. Since the machine supports multiple frequency scans, a FET with excellent shut-off characteristics is used for V402 to avoid increased power consumption at different frequencies.
The row excitation transformer T401 provides the necessary switching pulse current to operate V403 in a switching mode. Excessive current could potentially damage the V403 BE junction. To prevent this, a current-limiting resistor R428 and a shunt resistor R427 are connected in series on the B terminal of V403. Additionally, R427 forms a bleeder circuit with VD405.
During the turn-on period of V402, the positive and negative pulse voltages induced on the secondary winding of T401 are discharged through R427 and VD405, preventing excessive reverse current from damaging the V403 BE junction. The combination of C415 and R425 creates a damping circuit to protect against potential damage during the V402 cutoff phase caused by excessive D-peak voltage.
When V403 is saturated and conducting, the B+ voltage supplements magnetic energy in the primary winding (windings 1-2) of the output transformer T402. The original energy stored in the S-correction capacitor C425 passes through the primary winding of T402 and the row deflection coil H.DY, grounding the output of the line output tube V403. At this stage, the magnetic field generated in H.DY controls the electron beam to complete the scanning from the center of the screen to the right half. During the V403 cutoff period, the current in H.DY cannot change abruptly, inducing an electromotive force in H.DY. The line-reverse capacitors C418 and C419 are charged. As the charging current decreases to zero, the voltage across C418 and C419 reaches its peak, then gradually reduces to zero as H.DY discharges, completing the reverse retrace process until the current in H.DY reaches its reverse maximum, converting all electrical energy into magnetic energy.
At this point, the double damper tube VD408, consisting of two Schottky diodes, becomes positively biased. The current in H.DY forms a loop through VD408, controlling the electron beam to complete the scanning from the center of the screen to the left half.
In summary, the TPV S569P color display system employs advanced circuitry to ensure efficient and reliable performance across multiple frequency ranges. The use of precision components like the industrial router crystal and high-quality MOSFETs enhances overall system stability and longevity. Understanding these intricate details is crucial for anyone looking to troubleshoot or upgrade such systems, as even minor adjustments can significantly impact performance.
Moreover, the integration of specialized components like the inductors and aluminum electrolytic capacitors reflects a commitment to quality and innovation in the design of modern electronic devices. These elements work together seamlessly to optimize energy efficiency and minimize losses, making the TPV S569P a standout choice for high-performance applications.
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Suzhou Mountain Industrial Control Equipment Co., Ltd , https://www.szmountain.com