Four troubleshooting cases of the hottest Heidelbe

Four troubleshooting cases of Heidelberg CD102 four-color offset press

fault 1 abnormal sound of air compressor

when the machine is in normal operation, the air compressor stops and starts again, and the CP window displays fault Q02 Q67, and the fault light flashes at the same time; Restart the air compressor without rotation; Cut off the power supply of the whole machine and then switch it on. The air compressor can work again. Carry out the corresponding experiment, but stop after turning for a period of time. After inspection, the power supply and control switch 15q2 of the air compressor are normal, the relay K5 does not engage, and the motor M5 does not work. Since K5 is signaled by the CP window and controlled by the circuit board lvm002, other pumps do not work when the fault occurs, so it is suspected that the fault is in the main circuit. Measure Q5 (with auxiliary point three pole control switch), the main line is normal, but the auxiliary point is off. After resetting the control switch, the auxiliary point is still off. Short circuit the auxiliary point with an electric pen and try the machine again. K5 pulls in M5, and other pumps work and sound normal, so it is determined that there is a problem with the control switch, and the fault is eliminated after replacing the control switch

fault 2 alcohol fountain system fault

cp window shows that there is a problem with alcohol concentration, and the fault light flashes. Alcohol fountain system is independently controlled by an electric cabinet. 4F1 and 4F2 in the electric cabinet are power control switches, 6n1 is alcohol controller, and there is a sign signal line. The working principle is: when the alcohol concentration cannot reach the set value, the controller sends out the alcohol adding signal, the solenoid valve 8y2 is sucked, and the alcohol is sucked into the controller through the suction nozzle 7b3. When checking the system, it was found that 6n1 sent out the alcohol adding signal, the solenoid valve 8y2 was sucked in, and the alcohol was sucked, but the suction force was very small. If the straw was directly inserted into the alcohol bottle, the alcohol could be sucked in, so it was suspected that the liquid pipeline was faulty, which might be air leakage or blockage. Remove the controller and clean it. It is found that the suction hole of the solenoid valve is blocked. After cleaning, the fault is eliminated and the machine operates normally

fault 3 CP window display has no display

when the machine is working normally, the CP window display suddenly has no display, no graphics, no characters, just a red screen, but the button switch and indicator light on the operation panel are normal, which can control the machine to work normally, and the fault indicator light is not on. After inspection, it is found that the control power supply 15q62a is normal, the Zid (control console display) board is normal, and the dnk2 (display power supply board) is normal, except that the plug of a small circuit board emp8 (EPROM modular board No. 00.781.3680) on the DSK (display control board) is loose. After turning off the power, plug the small circuit board tightly to avoid high cost. Then turn it on, and the CP window will display normally

fault analysis: the circuit board controls the graphic display, but there is no fixing screw to fix it with the main board. It is only connected with the plug and socket (there is a small plastic card). When the console vibrates due to paper intrusion or other reasons, the circuit board may loosen, especially sideways. Therefore, the installation design of the circuit board should be improved. In order to prevent this fault from happening again, the circuit board can be fixed with plastic tape

fault 4 CP window shows that the pull gauge is not in place

after power on, the CP window fault indicator flashes, the pull gauge positioning icon on the display flashes, and the positioning of OS (operator side) cannot be reached, and there is only one direction of movement during adjustment, without fine-tuning signal

fault analysis: the positioning of the pull gauge is completed by two motors 1m7 and 1m8 driving the lead screw. 1m7 and 1r7 (format setting pull lay DS) are the adjustment and feedback signals of the transmission side, and 1m8 and 1r8 (format setting pull lay OS) are the adjustment and feedback signals of the operation side. Because the motor at the operation side moves in only one direction, it is suspected that the feedback potentiometer is faulty. Remove the 1lvtl electric box cover, because 1ssm1 and 2S clamp the other end of the sample in my jaw SM1 can be interchanged, and its circuit board number is 91.145.1051, so the method of exchange and comparison can be adopted for troubleshooting. Measure the voltage of C1 and C2 points in 1ssm1, and the measured starting point voltage is 24V, which is about 4V during fine adjustment; However, the A1 and A2 points of 2ssm1 only have 24V voltage, without fine-tuning voltage. The resistance value of 1r8 feedback potentiometer is normal, which is 10K Ω (order number is 63.10.0399), while the X5 terminal has virtual connection. The fault was eliminated after the connecting wire was fixed again with a screwdriver, so the fault was caused by the virtual connection, which was caused by the current relatively large load of 20KN (3) 00kn

(author/renxiaojing)