Maintenance Experience- press electrical troubleshooting 3 - printing presses, e

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1, BISHENG WD-E-type offset press ?? Symptoms: start the machine running and found I did not switch ink roller.
Analysis and Maintenance: Machine side door opened (four inside the water, ink speed devices), and found a red light speed printed circuit boards (indicating a failure), hands touch the motor end exposed rotor shaft?? does not change. Consider the introduction of machinery for the new machine,You are not allowed to view links. Register or Login, not with speed circuit boards, can only be taken for test methods to ensure quasi-motor point of failure. Shutdown, the motor and the motor power line II ink insertion plug exchange. Test machine: II Mexican motor is operating normally, and the original red light of the speed circuit board has been restored to green light (normal); but I still do not transfer ink motor and speed control circuit board has a corresponding red light that fault lies in the Mexican motor damage on I (but measured two Taiwan Power Company Machine data, did not find any different. ). Power, will I be Mexican motor with deceleration devices removed, and then switching to a new ink set of plastic motor installed, and then restore the plug insert itself. Power test machine: I II ink ink and motor are in normal operation, and troubleshooting with deceleration devices, why should it be replace them? If one is mainly for the motor, then, if not enable precise assembly of motor and speed reduction device in place, then easily occur in the operation of the motor rotation is poor or non-smooth failure, long time and easy to damage motor.
2, JS2102-type offset press Failure phenomenon 1: normal Print , The counter suddenly not counted.
Analysis and Maintenance: The detection count signal to send to the counter close to the switching transistors due to constant output (under normal circumstances, should be synchronized with the rotation of the machine through the iron (block) about (the transistor close to the switch ), the transistor close to the switch will turn once after iron turned off?? pulse signal to the counter to count). Power, the transistor switches removed after close inspection: not found in oscillation circuit or some component coil bad solder joint defects. Then try another power: not with iron block, its output is constant with output; the DC voltage with a multimeter to measure the SCR file control has not been great, and between the cathode sent before the trigger circuit voltage level, which should not turn. SCR was suspected to be the anode and cathode by the current leakage between. Power, Electricity Soldering iron under the SCR, then multimeter resistance detected no leakage between the anode and cathode phenomena. However, since the leakage that exists, you should be there on its main circuit problem,You are not allowed to view links. Register or Login! Resistance with a multimeter to detect the file rectifier power supply circuit further found that the breakdown of a rectifier diode has. After switching to a new post with the type of rectifier diodes,You are not allowed to view links. Register or Login, try machine troubleshooting.
Failure phenomena 2: normal printing, the machine suddenly shut down by the high-speed reduced to low well.
Analysis and Maintenance: The observation, found in the stands, its electromagnetic speed asynchronous Electric motor The original motivation?? AC motor is functioning, but do not slip the clutch switch. Illustrate the problem of the deterioration in the clutch. But the view of the control box Panel The light has gone, what will that is good in DC main circuit fault is in the control circuit. Power, remove the control box,You are not allowed to view links. Register or Login, with a multimeter to detect the resistance profile of several key transistor parameters: find BG3 (transistor) and BG4 (single-junction transistor) each of the three mutual non-conduction between the electrodes, indicating that two internal have been blown (of course can not send pulses to trigger the main circuit of the SCR work). These two tubes all renewals, test machine: the machine does not turn. DC voltage with a multimeter test BG3 and BG4 tube voltage values are very low, measured, and NE555 monolithic block of voltage between pin is low; and then measuring their supply Office: R2 (resistance) input voltage to 15V, the terminal voltage of 14V, the power transformer secondary is clearly able to provide (via diode half-wave rectifier and filter capacitor after the upgrade) 24V voltage difference between the remote! Power, unplug the control circuit board, solder the next phase in parallel with the power supply filter capacitor of several files to detect resistance with a multimeter (when they age, they will cause the output voltage down): both charge and discharge performance was normal, showing no problem. Electricity: then multimeter measuring AC voltage profile in the main circuit board transformer secondary voltage of 24V, normal. This clearly shows: two power failures in the regulator (V15 and V16) or one of damage on. However, the actual inspection control circuit board, and no two of its previous regulator (the attached diagram and its physical map does not match). So only six steps to tracing: In the kind of three-terminal regulator is 7815 instead of the two regulator tube. After switching to a new 7815 three-terminal regulator and control circuit board plug it back in situ, the try machine troubleshooting.
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Maintenance Experience: press electrical troubleshooting 3 - printing presses, electrical fault - Pr
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