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Engine trouble stops suddenly when the analysis eliminates printer to use

来源: 作者:Stand originally 时间:2008-12-22 Tag: 点击:


When printer is used, stop suddenly machine, pass opportunity of the reopen after machine, without any reaction, power source light is not bright also

Analysis and eliminate: Open printer housing, pull out all join head, tear open next printer crust and screen cover, make circuit board is shown. Check power source circuit, discover fuse is in good condition, other part also did not discover the trace of apparent burn down. Switch on the mobile phone to detect with avometer rectification outputs end, have output of + 300V voltage, normal. Because do the circuit structure of place of the other in circuit of not clear power source and each,output the definition of end, because this cannot undertake temporarily,went down.

With the background of experience in maintaining practice for years, the decision is checked from laden end. Above all, arrive down join advocate accuse board the outlet that go up undertakes checking, make clear the function of every outlet. Among them CN6, CN7 is the drive line that needle and brief shot grow in the head that print respectively, CN8 is line of drive of paper electric machinery, CN9 is line of drive of word car electric machinery, other outlet all connects contact for sensor.

Next, the method of machine tries after using will laden one by one to pull out, respectively to CN6 ~ CN9 4 outlet did a test, indicator light of printer power source all did not illume. Diode of the glow in considering photoelectricity sensor also is the load of power source, so the decision pulls out respectively again the CN12 of the CN5 of sensor of join check paper and initiative position sensor has a test. As expected, should pull out try after CN5 machine, light of printer power source is bright, and there also is corresponding self check action in car of the word when switching on the mobile phone.

Measure CN5 flexible cable with avometer, discover its 2 feet and 3 feet are short receive, insert when CN5 advocate accuse board when, + 5V direct ground contact, bring about power source circuit to shed protection too consequently. Make the discovery when further examination, flexible cable and probe joint are already screwy be out of shape. Cut with scissors go to a when cable top damages, blow with bit next give a paragraph, after been receive afresh, try machine, trouble removal.

In the process that print, took group more when line feed, a Chinese character that plays is become to fluctuate by cent two cut

  Analysis and eliminate: Undertake to printer self check is operated, normal, logic of control of demonstrative printer itself and mechanical drive part all can work normally, breakdown goes out only possibly in part of circuit of interface of lead plane, printer or signal cable.

According to first easy hind difficult overhaul principle, examine the connection case of signal cable above all, the bolt that discovers signal cable and lead plane joint did not come back close, contact tilts. After pulling out contact, insert afresh prison, use one word screwdriver to come back close solid bolt of both ends close, switch on the mobile phone experiment, trouble removal.

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