电气和电子元件标准维护说明ELECTRICAL AND ELECTRONIC COMPONENT STANDARD MAINTENANCE INSTRUCTIONS
1. INTRODUCTION 介绍
A. This subject gives general instructions for overhaul of accessory boxes, printed circuit cards, and component boards. The component overhaul instructions will tell you when to use these instructions. Refer to the component overhaul instructions for special details such as functional tests, trouble-shooting and parts lists. If the component overhaul instructions are different than those in this subject, use the component overhaul instructions.
本主题给出了附件箱、印刷电路板和元件板的通用大修说明。部件大修说明将告诉您何时使用这些说明。有关功能测试、故障排除和零件清单等特殊细节，请参阅大修说明。如果大修说明与本主题中的说明不同，请使用大修说明。
B. Accessory box assemblies contain printed circuit card or component board assemblies, relays, electrical connectors, a wire bundle assembly, and other chassis mounted components. Most accessory box assemblies have a hinged cover which gives easy access to the components inside.
附件箱组件包含印刷电路板或元件板组件、继电器、电气连接器、线束组件和其他底盘安装组件。大多数附件箱组件都有一个铰链盖，可以方便地接触到里面的组件。
C. Printed circuit card assemblies have a circuit board with etched circuits and components such as resistors, capacitors, diodes, transistors, relays, heatsinks, integrated circuits, potentiometers, transformers, and fuses. Contacts at one edge of the board connect to a mating receptacle. These cards are usually coated with an encapsulant.
印制电路卡组件的电路板上有蚀刻电路和元件，如电阻器、电容器、二极管、晶体管、继电器、散热片、集成电路、电位器、变压器和保险丝。电路板一侧的插针与配对插座相连。这些电路板通常涂有封装剂。
D. A component board is almost the same as a printed circuit card but it does not include printed circuitry and encapsulant. Solder terminals or pigtail leads connect the board to the wiring of the next higher assemblies.
元件板与印刷电路板几乎相同，但不包括印刷电路和封装材料。焊接端子或尾纤引线将电路板与下一级组件的线路连接起来。
2. MATERIALS 材料
A. Aliphatic naphtha (Ref SOPM 20-60-01)
B. Isopropyl alcohol (Ref SOPM 20-60-01)
C. Primer — BMS 10-11, Type 1 (SOPM 20-60-02)
3. GENERAL 通用
A. Disassemble these components only as necessary to clean, examine or repair the components.
仅在清洁、检查或修理必要时拆卸这些部件。
B. Refer to these standard practices, as applicable:
在适用情况下，请参考以下标准操作规范：
(1) SOPM 20-11-01 for removal and replacement of components from circuit boards
SOPM 20-11-01，拆卸和更换电路板上的组元件
(2) SOPM 20-11-02 for electrical connectors
SOPM 20-11-02，电气连接器
(3) SOPM 20-11-03 for terminal lugs and electrical bond areas, and replacement of heat shrinkable tubing
SOPM 20-11-03，端子接线片和电气接合区，以及更换热缩管
(4) SOPM 20-11-06 for wrapped wire connections
SOPM 20-11-06，包线连接的
(5) SOPM 20-12-01 for soldering
SOPM 20-12-01，焊接
(6) SOPM 20-12-02 for electrostatic discharge sensitive devices
SOPM 20-12-02，静电放电敏感设备
(7) SOPM 20-50-05 for replacement of markers and labels
SOPM 20-50-05，更换标记和标签
(8) SOPM 20-50-09 for replacement of grommets
SOPM 20-50-09，更换索环
(9) SOPM 20-50-10 for replacement of identification and other markings
SOPM 20-50-10，更换标识和其他标记
(10) SOPM 20-50-12 for application of adhesives
SOPM 20-50-12，粘合剂应用
(11) SOPM 20-70-01 for protection and storage
SOPM 20-70-01，保护和储存
C. When you replace damaged wires, use the same wire type and color as the original, or as shown by the schematic diagram or overhaul instructions.
更换损坏的导线时，应使用与原导线相同的导线类型和颜色，或按照原理图或大修说明所示的导线类型和颜色。
D. Remove dust, dirt, and other unwanted material from the unit with low-pressure air suction.
用低压空气吸尘器清除设备上的灰尘、污垢和其他不需要的物质。
WARNING ：WHEN YOU USE ISOPROPYL ALCOHOL OR ALIPHATIC NAPHTHA, TRY NOT TO BREATHE THE VAPORS TOO MUCH. USE THESE CLEANERS ONLY WITH A GOOD FLOW OF AIR. DO NOT GET THESE CLEANERS IN THE EYES, ON THE SKIN OR CLOTHING. KEEP THESE CLEANERS AWAY FROM HEAT, SPARKS, OR OPEN FLAME.
警告 ：使用异丙醇或脂肪族石脑油时，尽量不要吸入过多的蒸汽。仅在空气流通的情况下使用这些清洁剂。不要将这些清洁剂弄到眼睛里、皮肤上或衣服上。请将这些清洁剂放在远离热源、火花或明火的地方。
CAUTION ：USE ONLY THESE CLEANERS. OTHER CLEANERS COULD DAMAGE ASSEMBLY SURFACES OR CAUSE CIRCUIT FAILURES. ALSO, ISOPROPYL ALCOHOL DISSOLVES ACRYLIC ENCAPSULANT. REFER TO 20-11-01 FOR DETAILS.
注意 ：只能使用这些清洁剂。其它清洁剂可能会损坏组件表面或导致电路故障。此外，异丙醇会溶解丙烯酸封装剂。详情请参阅 20-11-01。
E. Clean interior surfaces and electrical contacts with isopropyl alcohol or aliphatic naphtha. Dry fully with low-pressure air.
用异丙醇或脂肪族石脑油清洁内表面和电气插针。用低压空气充分干燥。
F. Examine the printed circuit board, electrical components, and solder connections with a minimum of 5-power magnification. Make repairs as necessary.
用至少 5 倍的放大镜检查印刷电路板、电气元件和焊接连接。必要时进行修理。
(1) Look for moved or loose components, broken leads, and damaged insulating sleeving and solder connections.
检查元件是否移动或松动、引线是否断裂、绝缘套管和焊接接头是否损坏。
(2) Look for physical damage such as cracks, distortion, deterioration, oxidation, or overheating.
检查是否有物理损坏，如裂纹、变形、老化、氧化或过热。
(3) Examine plated contacts for dirt, wear, corrosion, and deterioration.
检查电镀插针是否有污垢、磨损、腐蚀和老化。
(4) Look for damaged, lifted or broken circuit paths.
检查电路通路是否损坏、翘起或断裂。
(5) Look for damaged markings such as reference designations, component outlines, diode orientation symbols, and terminal identifications.
检查标记是否损坏，如参考代号、元件轮廓、二极管方向符号和端子标识。
G. To replace defective rivets or nutplates, remove the old parts. Install replacements with wet primer, BMS 10-11, Type 1, on the mating surfaces.
若要更换有缺陷的铆钉或螺母板，应卸下旧零件。在配合面上涂上 BMS 10-11 型 1 号湿底漆，安装替换件。
H. When you replace electronic parts, use only those specified in the Illustrated Parts List (IPL) of the component overhaul instructions. Do not use unapproved parts, such as “unscreened” parts, which are not specified in the IPL.
更换电子零件时，只能使用部件大修说明的零件图解清单 (IPL) 中规定的零件。不要使用 IPL 中没有规定的未经批准的零件，如 “未筛选 “零件。
I. When you are done with the overhaul, give the units protection and put them away with standard industry practices. Plastic bags in padded containers can be used. For electrostatic discharge sensitive units, be sure to give them protection per SOPM 20-12-02. Identify the containers by unit name or part number and the date of overhaul.
大修完成后，要对设备进行保护，并按照标准的行业惯例将其放好。可以使用塑料袋装在带垫盘的容器中。对于静电放电敏感的设备，一定要按照 SOPM 20-12-02 进行保护。按设备名称或零件编号以及大修日期标明容器。