Four-color offset press KBA 4 cases of electrical failure treatment - KBA, offset printing - Printing Industry
Fault 1 Color combination of the first pressure, sometimes no pressure, combined with manual compression, the same phenomenon. Check joint pressure solenoid coil, the resistance to normal only 24V power from time to time, WP12 the X10 has a green indicator light when the time is not on, check the electrical cabinet of the output module are output for each instruction, but no voltage output, suspected micro-relay output module damage. Output modules 50A4 and 50A5 exchange, the combined pressure normal, and remove the 50A4 and for micro-relay board, the machine is working properly.
Fault 2 The first group to play version of motor does not work, circumferential and axial are not can play version, but the Department has played in Colortronic windows version of the show. Check Registermodule129, 24V power supply normal, Monitoring of light were directed at the play version, UR + -. SR + - can be adjusted, but there is no voltage output P1 outlet Department. Survey Department potentiometer P8 plug (1k ) normal, a version motor output 4A, with protection, suspect a bad position controller. For positioning controller, a version motor working.
Fault 3 A bell but no point move, not running. Check safety circuit normal, the normal input signal, but no brake pull sound, 99K4 do not smoke, 24Y1 no electricity. Check control output circuit board 70A5 (MCIF23 plate number 495 052), found that X3 / 7 (maindrivebrake), X3 / 8 (maindriverampon) output indicator is not lit, indicating that no signal output, then remove the 70A5. Suspect may be the micro-relay bad, but check the relay's coil, the resistance to be normal, normally open contacts, and then check the output connection point and the relay and found that C67, C68 has two small capacitors Chi foot mark, remove the 2 capacitance measurements, are bad (Model 103K100V). For failure to eliminate with standard capacitor, the machine is operating normally.
Fault 4 Refrigerators sometimes have the power in the closing buzzer sound, running from time to time, to move also from time to time, sometimes pressing the positive and negative points, moving without any reaction; Sometimes the water of any unit roller motor, The machine will automatically turn up to the normal operation of one hour or so. Failure uncertain, erratic, confused. Really know how to make the start, I do not know how to find the fault. For 70A4. 70A5, 80A4, 80A5 as the main control board (MCIF23), and the same type are interchangeable, so to exchange electronic cabinet control circuit board approach, but trouble still. Swap board 50A4, 50A5 (MCIF22 plate number 495 001), the 50A5 to 50A4 position change, the machine can operate, to move also normal, but can not cover up the unit, lift of cover security loop on power. Will change back to the original circuit board to re-position the machine nor the bells and jog function, indicating 50A4 failure. Without a spare board, so check the board one by one micro-relay. Resistance, blocks, found that integrated circuits IC2 (UDN2987A) of 18,19 feet touch bad. After cleaning with alcohol back into the machine, the machine can jog and lift cover security loop is also normal after.
Thought that failure has been resolved, but the boot appears a few hours later when the water roll machine automatic operation of the fault. Measurement 50A4 of X7 / 3 feet (inchreversedeliveryside) on the ground voltage, a voltage of about 8V, when a group of open water roller motor, the voltage increase 2V, 1V sometimes not. The X7 / 3 lines cut, the machine is working properly, the fault disappears, lost. Paper Department received anti-point normal, but no counter-point of each unit. Each check point of the unit's anti-button switches the normal, check each unit DWP12 board found that the second group of DWP12 board X1 socket Department has the old fountain solution traces of corrosion, measuring 20 feet (machineinchreserve) and 13 feet ( damprollerautomatic) resistance value of 450 . Observed and analyzed from the point of failure, the board was leaking due to sink, with water droplets to the X1, the One day, plug the back produces rust to form even the electrical phenomenon. Cleaning agents, alcohol, and using clean needles to plug back and try machine, everything works, the failure to eliminate.
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