DSQC545A示教器模塊
印刷電路板清潔本節(jié)中有幾個(gè)電路板清潔程序。這些程序包括電路板清潔和清洗、邊緣連接器的清潔和邊緣連接器之間的電路板層壓。使用符合每個(gè)電路板需要的程序。清除電路板上的所有灰塵、污垢、油、腐蝕或任何其他污染物。在靜電安全工作站對印刷電路板進(jìn)行所有清潔和處理。處理印刷電路板時(shí)，務(wù)必遵守本說明第3節(jié)“特殊處理”下的步驟。一般清潔和清洗如果印刷電路板需要輕微清潔：使用清潔、干燥、過濾的壓縮空氣或防靜電現(xiàn)場服務(wù)真空吸塵器清除印刷電路板表面的灰塵和殘留物。清洗印刷電路板的另一種方法是：1.用異丙醇（99.5%電子級）噴涂印刷電路板，或用用異丙基醇潤濕的泡沫棉簽擦拭電路板。2.當(dāng)電路板清潔時(shí)，使用壓縮空氣將多余的溶劑吹出電路板。維修程序僅限于模塊更換。如果INFI-NET到計(jì)算機(jī)接口模塊出現(xiàn)故障，請將其卸下并更換為另一個(gè)。確認(rèn)更換模塊的雙列直插開關(guān)和跳線設(shè)置與故障模塊的設(shè)置相同。注：除非按下停止（INICT01）或停止/復(fù)位（INICT3）按鈕，且模塊操作已停止，否則請勿移除通電的INICT03和INICT02模塊。
邊緣連接器清潔
清潔邊緣連接器觸點(diǎn)：1.使用80%異丙醇（99.5%電子級）和20%蒸餾水的溶劑混合物。2.用溶劑混合物浸泡無絨布。3.平行于邊緣連接器觸點(diǎn)來回操作布。4.用浸有溶劑混合物的干凈布重復(fù)上述步驟。5.用干凈的無絨布擦干邊緣連接器接觸區(qū)域。要清潔變色或嚴(yán)重污漬的邊緣連接器觸點(diǎn)：1.使用Eberhard Faber（400A）粉色珍珠橡皮擦或同等產(chǎn)品去除變色或污漬。也可使用玻璃纖維或尼龍拋光刷。2.拋光過程中使用80/20異丙醇和水溶液將靜電放電降至最低。3.打磨時(shí)不要用力過大。僅使用足夠的力來照亮接觸面。清潔后檢查邊緣連接器，以確保接觸面無損失。檢查機(jī)柜內(nèi)的所有信號接線、電源和接地連接，以驗(yàn)證其完整性。檢查連接時(shí)，請始終按僅擰緊的方向轉(zhuǎn)動(dòng)螺釘、螺母或其他緊固裝置。如果連接松動(dòng)，則將其擰緊。如果連接牢固，擰緊操作將驗(yàn)證其是否牢固。不得進(jìn)行任何松動(dòng)連接的動(dòng)作。執(zhí)行此預(yù)防性維護(hù)任務(wù)時(shí)，必須關(guān)閉機(jī)柜電源。
Printed Circuit Board Cleaning
There are several circuit board cleaning procedures in this section. These procedures cover circuit board cleaning and washing, cleaning edge connectors and circuit board laminate between edge connectors. Use the procedures that meet the needs of each circuit board. Remove all dust, dirt, oil, corrosion or any other contaminant from the circuit board.Do all cleaning and handling of the printed circuit boards at static safe work stations. Always observe the steps under SPECIAL HANDLING in Section 3 of this instruction when handling printed circuit boards. GENERAL CLEANING AND WASHING If the printed circuit board needs minor cleaning: Remove dust and residue from the printed circuit board surface using clean, dry, filtered compressed air or an antistatic field service vacuum cleaner. Another method of washing the printed circuit board is: 1. Clean the printed circuit board by spraying it with isopropyl alcohol (99.5% electronic grade) or wiping the board with a foam tipped swab wetted in isopropyl alcohol. 2. When the circuit board is clean, remove excess solvent by using compressed air to blow it free of the circuit board.Repair procedures are limited to module replacement. If an INFI-NET to computer interface module fails, remove and replace it with another. Verify that the replacement module dipswitch and jumper settings are the same as those of the failed module. NOTE: Do not remove INICT01 and INICT03 modules under power unless the stop (INICT01) or stop/reset (INICT03) pushbutton has been depressed and module operation has been halted.
EDGE CONNECTOR CLEANING
To clean edge connector contacts: 1. Use a solvent mixture of 80% isopropyl alcohol (99.5% electronic grade) and 20% distilled water. 2. Soak a lint free cloth with the solvent mixture. 3. Work the cloth back and forth parallel to the edge connector contacts. 4. Repeat with a clean cloth that is soaked with the solvent mixture. 5. Dry the edge connector contact area by wiping with a clean lint-free cloth. To clean tarnished or deeply stained edge connector contacts: 1. Use an Eberhard Faber (400A) pink pearl eraser, or equivalent to remove tarnish or stains. Fiberglass or nylon burnishing brushes may be used also. 2. Minimize electrostatic discharge by using the 80/20 isopropyl alcohol and water solution during burnishing. 3. Do not use excessive force while burnishing. Use only enough force to shine the contact surface. Inspect the edge connector after cleaning to assure no loss of contact surface.Check all signal wiring, power and ground connections within the cabinet to verify their integrity. When checking connections, always turn a screw, nut or other fastening device in the direction to tighten only. If the connection is loose, it will be tightened. If the connection is tight, the tightening action will verify that it is secure. There must not be any motion done to loosen the connection.Power to the cabinet must be off while performing this preventive maintenance task.
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