Heidelberger Offset Printing Machine Motor Board Maintenance needs to observe whether the components on the motor board are burned out. For example, are the resistors, capacitors, and diodes darkened or faint? Under normal circumstances, even if the resistance is burned, its resistance value will not change, its performance will not change, and normal use will not be affected. At this time, a multimeter is needed to assist the measurement. However, if the capacitors and diodes are burned, their performance will change, and they cannot play their due role in the circuit, which will affect the normal operation of the entire circuit. At this time, new components must be replaced.
Also is important to observe the integrated circuits on the motor circuit board, such as 74 series, CPU, co-processor, AD and other chips, whether there are bulging, cracking, burning, blackening. If this happens, it can basically be determined that the chip has been burned out and must be replaced, for some microcontroller which has embedded firmware in the flash memory, MCU program recovery must be applied for microcontroller cloning;
It is offen quite common to have any damage over the printing equipment’s printed circuit board itself, so it is necessary to observe whether the traces on the circuit board are peeled or burnt out. Is the sink hole removed from the pad?
Finally it is to observe the fuse on the motor PC board (including the fuse and thermistor) to see if the fuse is blown. Sometimes the fuse is too thin to see clearly, you can use the auxiliary tool-multimeter to determine whether the fuse is damaged.
Most of the above situations occur because of the excessive current in the electronic card. However, what causes the current to be too large requires specific analysis. But the general idea of finding the problem is to first carefully analyze the schematic diagram of the circuit board which can be acquired from PCB reverse engineering if there is no way to obtain from original manufacturer, and then find its superior circuit according to the circuit pattern of the burned component, derivate it step by step, and then use the experience accumulated in the printing press machine control board repairing to analyze it most easily Where the problem occurs, find out the cause of the failure
