Xerox WorkCentre XK50cx Service Manual

Also see for WorkCentre XK50cx: User guide

1-2Precautions1-2 ESD PrecautionsCertain semiconductor devices and CIS (ContactImage Sensor) can be easily damaged by staticelectricity. Such components are commonly called“Electrostatically Sensitive Devices”, or ESDs.Examples of typical ESDs are: integrated circuits,some field effect transistors, semiconductor “chip”components, and the CIS in scanner.The techniques outlined below should be followedto help reduce the incidence of component damagecaused by static electricity.CAUTION: Be sure no power is applied to thechassis or circuit, and observe allother safety precautions.1. Immediately before handling a semiconductorcomponent or semiconductor-equippedassembly, drain off any electrostatic charge onyour body by touching a known earth ground.Alternatively, employ a commercially availablewrist strap device, which should be removed foryour personal safety reasons prior to applying powerto the unit under test.2. After removing an electrical assembly equippedwith ESDs, place the assembly on a conductivesurface, such as aluminum or copper foil, orconductive foam, to prevent electrostatic chargebuildup in the vicinity of the assembly.3. Use only a grounded tip soldering iron to solderor desolder ESDs.4. Use only an “anti-static” solder removal deviceSome solder removal devices not classified as“anti-static” can generate electrical chargessufficient to damage ESDs.5. Do not use Freon-propelled chemicals. Whensprayed, these can generate electrical chargessufficient to damage ESDs.6. Do not remove a replacement ESD from itsprotective packaging until immediately beforeinstalling it. Most replacement ESDs arepackaged with all leads shorted together byconductive foam, aluminum foil, or acomparable conductive material.7. Immediately before removing the protectiveshorting material from the leads of areplacement ESD, touch the protective materialto the chassis or circuit assembly into which thedevice will be installed.8. Maintain continuous electrical contact betweenthe ESD and the assembly into which it will beinstalled, until completely plugged or solderedinto the circuit.9. Minimize bodily motions when handlingunpackaged replacement ESDs. Normalmotions, such as the brushing together ofclothing fabric and lifting one’s foot from acarpeted floor, can generate static electricity