Paperless recorder repair knowledge

I remember using a paper recorder to use a pneumatic and electric paper recorder that was manufactured in Japan in 70 and 80 years. A daily tour inspection gave the recorder a roll of paper with red, blue ink, and an ink bottle. In the roots of the soft plastic pipe connected to the pointer line, the red on the blue is very difficult to accept, and later designed the pen with ink. There are 2,4,6 channels, recording paper archives, the overall cost is high.

1 Paperless recorder LCD backlight is bright, but no character and curve display.
Verify that the paperless recorder shows that the cable is properly connected.

2 channels do not count, that is to change the channel signal value, the channel display value without any change.
A using a multimeter to measure the signal on the terminal can be normal;
B test channel module switch and signal type can be set correctly;
C Open the case and verify that the channel signal cable is connected.

3 Paperless recorder is powered on without a task.

Paperless recorder repair knowledge In many ways, paperless recorder is a particularly important instrument, it can input the signal, but sometimes there will be some failures, today we will give you information on paperless recorder repair knowledge .
In many industrial sites, paperless recorders need to monitor the recording, instrument input signals, such as flow meter / flow signal, pressure transmitter pressure signal, thermal resistance and thermocouple temperature signal, through the high-performance 32-bit ARM The microprocessor performs data processing. On the one hand, it is displayed on a large-screen liquid crystal display screen in a variety of forms. On the other hand, the data of these monitoring signals are stored in the built-in large-capacity memory chip of the local machine. Data and graphics queries, pages, and prints are performed directly on the recorder. The paperless recorder eliminates the stylus pen and recording paper used in traditional paper recorders, improves the quality of the recorder itself, enhances the stability and reliability of the recorder, and more importantly, reduces the operating cost of the recorder. . In the process of using, there will still be many problems. Whenever people use paperless recorders, it may be because the use of time is too long or our abnormal operation may cause equipment problems. Discuss with you the need to understand the basic principles of some paperless recorders when this happens. The following points need attention in maintenance and repair:
1. When disassembling and adjusting the instrument, record the original position for recovery.
2. When troubleshooting a paperless recorder in a wet environment, it is necessary to measure whether the various points on the printed circuit are unobstructed, because the main fault in this case is corrosion of the copper foil.
3, repair precision paperless recorder, such as accidentally fly a small part, you can take the magnet scanning and line-of-sight scanning methods to find.
4, with a multimeter ohm block, remember not to live measurement.
5. When detecting the filter capacitor in the power supply, the positive and negative electrodes of the electrolytic capacitor should be short-circuited first, and the short-circuit line should not be used to discharge the capacitor instead of the lead wire, because it is easy to blow the core wire. It is possible to take a 220V, 60 to 100W lamp with a cap lead, which is connected to both ends of the capacitor. The lamp will flash at the moment of discharge.
6. When inspecting the internal circuit of the paperless recorder, if the contacts and circuit boards of the mounting components are coated with insulating varnish, the common parameters of the parameters can be measured by using ordinary hand-sewn welding on the test leads of the multimeter so that the paint can be directly measured. Point, without peeling off the paint layer.
7. Do not hot plug various control boards and plugs. In the case of power-up, the plug-in control board will generate a strong induced electromotive force. At this moment, the instantaneous counter-attack voltage is very high, and it is easy to damage the corresponding control board and plug.
8, do not blindly knock overhaul during maintenance, so as not to expand the failure, the more repair and more bad.
9. When using logic pens and oscilloscopes to detect signals, be careful not to make the probes short-circuit by simultaneously touching two measurement pins.
Through an overview of the paperless recorder repair knowledge, I believe that in the future when we encounter some of the above-mentioned problems, even if we are not a professional repair personnel can also do a simple maintenance of the equipment processing

A test paperless recorder 220V power terminal wiring is correct;
B test whether the paperless recorder fuse can be blown;
C Unscrew the fixing screw after the paperless recorder, pull the watch core out from the back, and check whether the cable between the power board and the motherboard can be plugged in.
4 Paperless recorder channel values ​​are not accurate.
In the A-test channel parameter setting, the signal type setting can be the same as the practice access signal type;
B. The channel module switch setting can be the same as the call signal type;
C test signal wiring is accurate, the signal cable can contact well;
D. After determining that there is no title, re-calibrate the paperless recorder (note that the signal source accuracy must be higher than 0.1%). If the paperless recorder calibration is abnormal