Paperless recorder repair essential knowledge

Abstract: Paperless recorders are input signals that need to be monitored and recorded at industrial sites, such as flowmeter flow signals, pressure transmitter pressure signals, thermal resistance and thermocouple temperature signals, etc., through high performance 32-bit. The ARM microprocessor performs data processing. On the one hand, it is displayed on a large-screen liquid crystal display screen in various forms. On the other hand, these monitoring signal data are stored in the built-in large-capacity memory chip of the local machine so that Data and graphics queries, pages, and prints are performed directly on this 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. This article mainly describes some maintenance methods of paperless recorder for your reference.

When using a paperless recorder , it may be due to the long time used or our abnormal operation may lead to equipment problems, then in this case you need to understand the basic principles of some paperless recorders . There are several points to note in maintenance:
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, with a multimeter ohm block, remember not to live measurement.
4. When repairing precision paperless recorders , if you accidentally fly a small part, you can use magnet scanning and line-of-sight scanning methods.
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 fault, the more repair and more bad.
9. When using logic pens and oscilloscopes to detect signals, be careful not to make the probes contact the two measurement pins at the same time to form a short circuit.
With this knowledge, when we encounter some simple problems, even if we are not professional repair personnel, we can rest assured to repair the equipment.

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