ncr主要部件故障分析与排除(电子配件)（NCR main component trouble analysis and elimination (electronic parts)）.docVIP

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ncr主要部件故障分析与排除(电子配件)（NCR main component trouble analysis and elimination (electronic parts)）.doc

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ncr主要部件故障分析与排除(电子配件)（NCR main component trouble analysis and elimination (electronic parts)）

ncr主要部件故障分析与排除(电子配件)（NCR main component trouble analysis and elimination (electronic parts)） NCR main component trouble analysis and elimination (electronic parts) First, magnetic card reader (MCRW) fault 1, fault phenomenon: Do not open the card into the slot when the MCRW shutter, the card can not enter. 2 、 diagnosis and analysis: Use KEY disk into the MCRW diagnostic procedures in Supervisor, according to the picture in which the card tips will not open the mouth of the card. According to the basic principle of MCRW, a magnetic card detection switch in width at the entrance of MCRW (SW1), the magnetic induction head (Sense Head) and shutter solenoid valve. The width detecting switch is used for judging the width of the magnetic card; the magnetic induction head is used for sensing the second or third tracks of the magnetic card. When the card into the slot, if the card is inserted into the right direction and width of magnetic induction head is in line with the requirements of the control circuit and the detection circuit card issued at the same time, the width of the interrupt request signal, the output voltage of the main control circuit of 24V shutter solenoid valve pull, the shutter opens into the card, as long as there is a condition which does not conform to not open. Use the instrument to check the width of the card detection switch (SW1), the switch contact is good; check the magnetic induction head (Sense Head) and a shutter solenoid valve coil DC resistance were normal, and the electromagnetic valve should pull in electromagnetic coil without voltage 24V. With a finger poke which will promote MCRW magnetic force. Diagnostic procedures to read the first track, track second, read read and write third tracks, TUNKA were a series of tests were normal, which not only the back of the card, the card can not quit. The read-write magnetic card function is completed by the read-write head and the magnetic card position sensor (PD1, PD2, PD3) control circuit. Rea