Many types of plate, using a light source is also different. Here to tell us about the structure of box-type plate characteristics, and all kinds of box-type plate, as well as the different characteristics of some common failure points.

 Box-type plate appearance are cube structure, and superstructure are sealed blanket surrounding the framework and has tape sealed seams and handles can be set off. The use of vacuum pumps connected to the trachea and pumping. And between the following box, locking front, rear hinge has two sides have pole connected. Closures under the excellent transparency, texture, uniformity, thickness of plate glass is about 10mm. Tank equipped with a rear exhaust fan. Central for the light box, box has iodine gallium light or halogen light source. Light source is surrounded by a parallel light reflex reflectors. Precision Screen Exposure Machine integral photoelectric instrument is used to control light, limiting the exposure time with automatic functions. Ordinary Screen Exposure Machine is used set the standard number of seconds, limiting the exposure time. The need to produce a network version, the blanket on the open framework, first photographic glass plate negatives attached to the parallel surface, will be coated with photosensitive plastic net box printing surface of the membrane close to the film surface, then cover rubber cloth framework, the beginning of vacuum, the use of blanket contraction will net surface attached with the film firmly in the glass, the open exposure of a certain wavelength of light source, set the best exposure time, exposure time to be one that is automatically shut down the light source. Automatic mode of operation can also be converted to manual operation mode. A plate the quality factor depends mainly on three aspects, the first plate are vacuum pumping system is able to make photographic film and photographic materials on screen pull-close, do not have any and clearance; article Second, exposure of the entire layout around the edges and between the location of the illumination is uniform. The third performance stability as well as the exposure control circuit of the exposure light source durability and stability.

 Several different forms, characteristics of the box-type plate revealed by the failure is also different. But regardless of what kind of problems will directly affect the quality of plate. The following points about several different forms of the structural characteristics of plate and fault analysis and excluded.

 First, there will be several common plate failure include:

  1, due to inadequate suction or no suction, so that photographic film and photographic materials Mesh Can not closely attached on the glass, resulting in plate-making appears walking spaces, distortion, jagged, blurred, such as standard screen. Plate appears inadequate suction or no suction of such failure, the main analysis, follow these steps: preliminary judging method is to vacuum pump and trachea to separate the vacuum pump with the thumb inspiratory mouth shut to observe whether the barometer pointer point to the maximum, If the maximum point is illustrated vacuum pump is operating normally, it should be judged are the trachea, in some blanket leakage phenomenon (including: Blanket leakage has occurred trachoma; sealing tape adhesion appears not leak; cover version of elastic adjustment adjustment screw does not fit, loose, tight gas leakage will occur; inspiratory tube interface around loose, emerging from leakage, etc.). If the barometer pointer or no reflection of a small vacuum pump is illustrated in abnormal operation (fault phenomenon include: vacuum pump motor coil burned to stop operation, oil-free vacuum pump caused by card to stop functioning die, vacuum suction inside the leaf damage caused by phenomena such as insufficient reasons).

 2, plate after a certain period of time use, I feel the actual exposure time than expected increase in the number of exposure time. (1), light exposure reduced the energy to work long hours required to replace the lamp. (2), even if the replacement of a new lamp, be still a long exposure time. At this point箱体内first consider the clean; secondly, to consider whether they have a good reflex reflectors effects, as well as the effect of glass transmittance; followed to be considered as the replacement of a new lamp if there are problems with the quality.

  Second, the different characteristics of a variety of plate, failure analysis and to exclude: 1, SWE1100 type plate, power of 2KW. The use of relay control circuit, push-button operation panel. Equipped with a vacuum exhaust, exposure timer functions. Manual inspiratory, exposure, according to the automatic cut-off timing. Common Faults: panel power LED, but can not start. Failure to check the order of: A, Insurance burned; B, AC contactor contact carbonization, such as poor contact or coil burned; C, hot automatic tripping relay; D, vacuum pump burned or Die card; E, Exposure lights burn ; F, rectifiers, triggers fault. 2, SWE1200A type plate, power 3KW. The use of microcomputer control, with a group of ten memory channels. With imports of oil-free vacuum pump and the general type mute domestic vacuum two. Control circuit board, touch-operation panel. Exposure time settings, its running time is not a standard number of seconds, instead of using the photoelectric light integral instrument control, automatic limited exposure time to compensate insufficient light. Easy to operate, from the lamp aging, as well as operator experience implications. Applied to fine lines, network design, circuit board version of the production network. Practical economic. Automatic and manual exposure mode. Automatically when the pre-exhaust with exhaust after the secondary function, the default time to exhaust, auto exposure. Default exposure time to the automatic cut-off. Manual mode is activated manually, manual stop. Fault Analysis: A, the operation panel on the digital display showed a weak or incomplete. As a result of damage to the bridge rectifier, operation panel 5V DC input voltage values or not enough (7805)

 Triangular voltage regulator failure; B, can not open the suction pump and exposure lights. Rectifier output voltage of 24V, (7824) triangular voltage regulator IC chip to be irritable or failure to wear; C, can not be achieved automatically when the second sniff, that is not affected Blanket suction plate. Vacuum the top of the solenoid valve dropped, burned or damaged control relay; D, UV lamp is a negative resistance-type gas discharge devices, regardless of good ring, with a multimeter measuring both open-circuit state, and under normal circumstances, even if damaged also on the open-circuit state, will not affect the circuit, but in high-pressure state is likely to short-circuit or low resistance state. Exhaust end of the control circuit into the work of state, step-up transformer output instantly added to high-pressure tubes at both ends, due to short-circuit or low resistance, strong currents caused by the impact of high self-inductance of electric power through other lines窜入control loop and trigger a fault. At this point will cause microcomputer control circuit board failure, as well as rectifier bridge was excited to wear the phenomenon, such as a special case of failure.