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muy buen manual completo de buena calidad de impresion preciso y detallado , muy útil para la reparación.
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The service manual is a good quality scan of the Panasonic NV-850, which is electrically identical to the Philips VR 6920, but mecanically just nearly.
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The service manual is a good quality scan of the Blaupunkt RTV-404, which is electrically and mecanically identical to the Panasonic NV-830.
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completo manual bien detallado y de buena calidad de impresion , se echa en falta los esquemas de placa y parte de algun diagrama.
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perfecto manual ,completo y detallado de muy buena calidad de impresion, ideal en una palabra.
THEORY OF OPERATION
2-2-5. Carriage Motor Speed Control Since the carriage motor is a stepping motor, the carriage can be stopped at a desired position by controlling acceleration and deceleration. The carriage can also move backward. The rotational speed of the carriage motor is set by the number of pulses per time unit. The character pitch (horizontal character size) in each print mode is determined by changing this rotational speed (or carriage transfer speed). (1) At start-up of the motor: The number of pulses input to the motor increase in steps, reaching a certain frequency. (2) To stop the motor: The number of pulses input to the motor decreases in steps, in order to gradually bring the motor to a halt. (3) When printing is carried out: Pulses of a uniform pulse width are supplied for printing. 2-2-6. Paper Feed Motor Driving Circuit Again, a stepping motor is employed as the paper feed motor, which turns a certain angle only when a drive pulse is received. This 4-phase stepping motor is controlled by the phase 1-2 excitation method. The following shows the paper feed motor drive circuit and the control signal generated by the phase 1-2 excitation method.
Fig. 2-12 Paper Feed Motor Driving Circuit
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