Fault analysis and maintenance of monitor 2

Analysis and maintenance of fault of monitor

Fault D:

Turn on the power indicator, and the black screen will not be valid by any key.

Maintenance analysis:

The power supply effect is good due to the power indicator light. Key inspection main board, because of no circuit diagram, first carefully check the elements have discoloration, deformation and fever and other anomalies, found a patch electrolytic capacitor discoloration, through the multimeter on-line measurement has no capacity, after welding measurement has broken. Don't rush the electric test machine after the replacement. In order to analyze the cause of the damage, we measure the other components according to the line of the circuit board, and find a short circuit of the triode. After the replacement of the test machine, the monitor is restored to normal EEG machine.

Fault E:

When measuring blood pressure, there is no air pump and the blood pressure can not be measured.

Maintenance analysis:

The air pump has no air tone, and is judged to be an air pump motor malfunction or an air pump power supply circuit fault. The monitor manufacturers use multimeter to measure the motor's short circuit, which can be judged as the fault of the air pump motor. Turn on the back cover of the motor and see that the electric brush is off, and the two electric brushes are bumping together. Reset the reset, use a regulated power supply to 6V, test the air pump motor running normally, inflate the air bag well. When the air pump is installed, the air pump still does not rotate. The power supply circuit of the air pump has no 6V voltage. Following the detection of the power supply circuit of the air pump, it is found that a current limiting resistance circuit breaker may be a brush short circuit causing the current limiting resistor to break and change the resistance. The blood pressure measurement circuit is restored to normal.

2.2 table Rui PM-9000 multi parameter monitoring 'instrument

Fault A:

Unable to carry out blood pressure measurement, fault shows: "air pump leak."

Maintenance analysis:

After entering the leak detection procedure, it was measured as a leak. First of all, whether the leakage of gas outside the pipeline and cuff was checked was normal. Open the casing to check the air pump, pipeline and solenoid valve, and find that the vent valve leaks. Tighten the valve port, inflate the test well, install the electricity test machine, and monitor the blood pressure.

Fault B:

Unable to carry out blood pressure measurement, fault shows: "air pressure error".

Maintenance analysis:

First, check whether the outside pipeline and cuff are leaking, and there is no rupture and leak. To check the air pump, pipe and solenoid valve, the machine has no blood pressure 1 surname, the test adopts the shock method, when the machine is open and inflated, it can be normal, the pressure is normal, the slow release valve is gradually slow to release air by the step quantity; when the J jade force is down to about 12kPa (90mmHg), the vent valve is deflated and the blood pressure can not be measured. The reason for analysis is that the release time of the slow release valve exceeds the program preset, forcing the vent valve to open and deflate. The resistance of the slow release valve coil is normal, and the electricity is absorbed normally. However, there is rust and dirt in the valve joint, resulting in poor gas release, resulting in too long deflation time. Troubleshooting after cleaning.

2.3 photoelectric 6201K monitor

Failure phenomenon:

The photoelectric signal is displayed on the screen, but the recording can not be carried away.

Maintenance analysis:

Photoelectric 6201 K monitor recorder has no paper motor protection circuit, and protection circuit is often the key part of maintenance. The principle of its protection is as follows: when the current of the motor is reached to its rated limit (300mA), the sampling resistance R160 (2.2 Ohm) is connected in series, and the voltage is added to the base of the Q1 L5 to guide it, and the motor drive voltage is pulled to zero, so that the voltage is stopped and the purpose of protecting the motor is achieved. When the fault is overhauled, the sample resistance Rl60 resistance is normal, the dynamic voltage is 0. 65V, the static voltage 0V, indicating that the state control signal is normal, and that the paper is not the motor protection circuit is not normal, and can be improved on its circuit. That is, the resistance of a 2.4 ohm on the R160 sampling resistor is reopened. The resistance pressure drop is 0. 3V, the Q115 can not be guided, the protection circuit cut-off, the motor running is normal.