812A-20-08558 V.B Patient Monitor ECG Board 812A-30-08557

812A-30-08557 812A-20-08558 V.B Mindray PM7000 Patient Monitor ECG Board

A brief introduction to the maintenance and troubleshooting of monitors

Methods of Troubleshooting and Troubleshooting for ECG Monitor

The ECG monitor plays an important role in the whole monitoring process. Since the monitor works continuously for almost 24 hours, its failure rate is also high. The common faults and troubleshooting methods are introduced as follows.

1. No display when booting

Fault phenomenon: When the instrument is turned on, there is no display on the screen and the indicator light is not on; when the external power supply is connected, the battery voltage is low and the alarm is turned off, and then the machine automatically shuts down; useless.

Inspection Method:

① When the instrument is not connected to AC, check whether the 12V voltage is low. This fault alarm indicates that the output voltage detection part of the power board detects a low voltage, which may be caused by a fault in the detection part of the power board or a fault in the output of the power board, or it may be caused by a fault in the back-end load circuit.

②When the battery is installed, this phenomenon indicates that the monitor is working on the battery power supply and the battery power is basically used up, and the AC input is not working normally. The possible reason is: the 220V power socket itself has no power, or the fuse is blown.

③When no external battery is connected, it may be judged that the rechargeable battery is broken, or the power board/charging control board is faulty and the battery cannot be charged.

Troubleshooting method: connect all the connecting parts reliably, connect the AC to charge the instrument.

2. ECG has no waveform

Symptoms of failure: connect the lead wire but there is no ECG waveform, and the display shows "electrode off" or "no signal received".

Checking method: first check the lead mode, if it is five-lead mode but only three-lead connection is used, there must be no waveform.

Secondly, on the premise of confirming the placement position of the ECG electrode and the quality of the ECG electrode, exchange the ECG cable with that of other machines to confirm whether the ECG cable is faulty, whether the cable is aging, or the pin is broken. .

Again, if the failure of the ECG cable is ruled out, the possible cause is that the "ECG signal line" on the parameter socket board is not in good contact, or the ECG board, the main control board connection line of the ECG board, and the main control board are faulty.

Elimination method:

(1) Check all the external parts of the ECG leads [the three/five extension lines in contact with the human body should be connected to the corresponding three/five contact pins on the ECG plug, if the resistance is infinite, it means that the lead wires are broken. , the lead wire should be replaced].

(2) If the waveform channel of the ECG display shows "no signal reception", it means that there is a problem with the communication between the ECG measurement module and the host, and the prompt still exists after turning off and on again, and you need to contact the supplier.

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