What should I pay attention to when repairing a paperless recorder?

The paperless recorder has a certain degree of stability and reliability, which reduces the operating cost of the recorder. However, paperless recorders sometimes have problems. When solving these problems, what areas do we need to pay attention to?

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 the small parts, you can take the magnet scanning and line-of-sight scanning method 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 the internal circuit of the paperless recorder is inspected, if the contacts and circuit boards of the mounting component are coated with insulating varnish, the common parameters of the parameters can be measured by using ordinary hand-stitch welding on the test leads of the multimeter so that the paint layer 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.