心电图机的检修（Maintenance of electrocardiograph）.docVIP

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心电图机的检修（Maintenance of electrocardiograph）.doc

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心电图机的检修（Maintenance of electrocardiograph）

心电图机的检修（Maintenance of electrocardiograph） According to the characteristics of the aircraft, the specific steps are as follows: Turn on the power switch, the power indicator light is on, but the pen doesnt move, and the LCD screen doesnt show any. Because of the display of the LCD screen and related control, IC101 (MSM5840RS) control, MSM5840RS is 4 bit CPU, so check the CPU power line, found J103 connection broken three. The machine in the control board, the main amplifier UT-20033 and floating put three groups of wiring board between UT-20037, J102, J103 are respectively connected with the connecting line, J104, fragile, back and forth several times may break, because the machine after the repair, these connection lines are all broken. J102 has been replaced with common cords and J103, J104 with a broken part of solder, the J103 connection all connected by flexible cords, and check the other lines are normal after the boot, LCD screen display is normal, but the pen does not act [release] finishing medical education network. Normally, the pen should have a short shake when it is switched on. Press the keys on the panel, from the LCD screen shows the keying is normal, visible CPU control part of the normal. In the manual TEST mode, press the start button (START) to move the paper properly, press the 1mV button, and the pen does not respond. Adjust the baseline potentiometer on the panel, and the pen is not adjusted. Source: Medical Education Network Because the pen does not adjust, it is checked from the power amplifier section. The recorder machine amplification part adopts a position feedback circuit, by IC114 (AF6330) composed of position feedback signal processing and gain GAIN (VR102), LIM (VRl03), the limit of DAMP damping (VRl04) control circuit, and then by the ICll5 (AF6331) and Q108, Q109, Q110, Q111 BTU power amplifier, complete the recorded signal amplification requirements. The power supply voltage of the 11 pin of the power amplifier class ICll5 is 11.