The current blood analyzer of basic-level hospitals in our country has been very widely used



The current blood analyzer of basic-level hospitals in our country has been very widely used, the medical instrument has become one of the important equipment of testing data of blood. Especially use frequency is very high, once the instrument problems will cause a great disturbance, was carried out on the detection of normal plant below small make up to introduce several common not circuit troubleshooting skills and methods:

Increased 1. Background: said earlier, gain adjustment can cause increased background, it is based on the histogram of observation on the basis of the analysis. And the machine sensitivity caused by improper adjustment background is too high. Some high background is caused by the damage of circuit, unplug the signal lines, for example, the background is still high, so check the amplifier and its associated circuits. In addition, signal shielding is bad can lead to high background, in a count of 60 v voltage model, signal lines, in order to prevent interference using shielded wire, as just a negative electrode, one need only single strands of shielding wire is ok, someone called coaxial cable, this is a serious mistake.

(plant brand products - XFA6000Intelligent intelligent automaticblood cell analyzer)

2, graphics, chaos: ladder graphics, shoulders the graphics, the graphics of the little narrow, etc., serrated graphics, Zhao Gong image is called ecg, emerged as a large number of these images, the first thing to consider anticoagulant and diluent, circuit first check the signal lines and hole whether the voltage fluctuation, the gain of circuit board adjustment point is accurate, such as amplifier detection and adjustment circuit damage probability, will not appear in the AD conversion or digital circuit, so don't try so hard to check what the digital circuit, does not make sense.

3, action or no action: generally is the result of a damaged control circuit, for example, solenoid valve, or damage to the motor control circuit the actuator can action, damage control circuit is just the end also good, don't move it, if the input circuit, the digital part cannot work normally, even machine cannot boot. Each time you do check the maintenance spare a little time the circuit part can check test point checkpoints are measured again, drift beyond the scope of adjustment be back soon.

4, calculation error: most of the program, as some 4 classification machine, add up the percentage of each category can 4 to 101%, ha ha, is absolutely program algorithm (similar to round up the decimal point algorithm), to ignore. But some equipment is a problem with the device selection, program editing test is not enough, also can cause addressing error (RAM addressing, etc.), will cause the loss of data or even not shown, for example, the ABX 18 become eight, HGB on the low side, 0 such as HGB, wrong is the RAM.

5, counting on the high side or low or unstable poor repeatability, high to low is usually due to the bad linear amplifier on line, replace the amplifier or the surrounding components, not bad stability and repeatability are also associated with linear, general amplifier circuit or circuit problem.

6, the use of the multimeter and circuit identification: there are a lot of basic knowledge of electronic website online, go to learn more, help yourself, in the recognition, integrated circuit resistance capacity components of color ring color logo, two, triode, the measurement, the resistance of the rc components and integrated circuit measurement, online electricity state voltage measurement circuit is good or bad, and so on. Any a kind of integrated circuit can be checked on the Internet to chip data, there was a pin, the definition of the reference circuit connection, can withstand the limit, the normal range and sequence diagram, etc., to check the judge of the circuit there is a big help, of course, some manufacturers make their circuit there is no way to find, like PDA chip in east Asia.