Dell Wyse 5470 Service Manual

Also see for Wyse 5470: Service manual

Contents

ESD field service kitThe unmonitored Field Service kit is the most commonly used service kit. Each Field Service kit includes three main components: anti-static mat, anti-static wrist strap, and bonding wire.Components of an ESD field service kitThe components of an ESD field service kit are:• Anti-static mat—The anti-static mat is dissipative and parts can be placed on it during service procedures. When using an anti-staticmat, your anti-static wrist strap should be snug and the bonding wire should be connected to the mat and to any bare metal on thesystem being worked on. Once deployed properly, service parts can be removed from the ESD bag and placed directly on the mat.ESD-sensitive items are safe in your hand, on the ESD mat, in the system, or inside a bag.• Anti-static wrist strap and bonding wire—The anti-static wrist strap and bonding wire can be either directly connected betweenyour wrist and bare metal on the hardware if the ESD mat is not required, or connected to the anti-static mat to protect hardwarethat is temporarily placed on the mat. The physical connection of the anti-staticwrist strap and bonding wire between your skin, theESD mat, and the hardware is known as bonding. Use only Field Service kits with an anti-static wrist strap, mat, and bonding wire.Never use wireless anti-static wrist straps. Always be aware that the internal wires of a anti-static wrist strap are prone to damagefrom normal wear and tear, and must be checked regularly with a anti-static wrist strap tester in order to avoid accidental ESDhardware damage. It is recommended to test the anti-static wrist strap and bonding wire at least once per week.• ESD wrist strap tester—The wires inside of an ESD strap are prone to damage over time. When using an unmonitored kit, it is abest practice to regularly test the strap prior to each service call, and at a minimum, test once per week. A wrist strap tester is thebest method for doing this test. If you do not have your own wrist strap tester, check with your regional office to find out if they haveone. To perform the test, plug the wrist-strap's bonding-wire into the tester while it is strapped to your wrist and push the button totest. A green LED is lit if the test is successful; a red LED is lit and an alarm sounds if the test fails.• Insulator Elements —It is critical to keep ESD sensitive devices, such as plastic heat sink casings, away from internal parts that areinsulators and often highly charged.• Working Environment – Before deploying the ESD Field Service kit, assess the situation at the customer location. For example,deploying the kit for a server environment is different than for a desktop or portable environment. Servers are typically installed in arack within a data center; desktops or portables are typically placed on office desks or cubicles. Always look for a large open flat workarea that is free of clutter and large enough to deploy the ESD kit with additional space to accommodate the type of system that isbeing repaired. The workspace should also be free of insulators that can cause an ESD event. On the work area, insulators such asStyrofoam and other plastics should always be moved at least 12 inches or 30 centimeters away from sensitive parts before physicallyhandling any hardware components• ESD Packaging – All ESD-sensitive devices must be shipped and received in static-safe packaging. Metal, static-shielded bags arepreferred. However, you should always return the damaged part using the same ESD bag and packaging that the new part arrived in.The ESD bag should be folded over and taped shut and all the same foam packing material should be used in the original box that thenew part arrived in. ESD-sensitive devices should be removed from packaging only at an ESD-protected work surface, and partsshould never be placed on top of the ESD bag because only the inside of the bag is shielded. Always place parts in your hand, on theESD mat, in the system, or inside an anti-static bag.• Transporting Sensitive Components – When transporting ESD sensitive components such as replacement parts or parts to bereturned to Dell, it is critical to place these parts in anti-static bags for safe transport.ESD protection summaryIt is recommended that all field service technicians use the traditional wired ESD grounding anti-static wrist strap and protective anti-static mat at all times when servicing Dell products. In addition, it is critical that technicians keep sensitive parts separate from all insulatorparts while performing service and that they use anti-static bags for transporting sensitive components.Transporting sensitive componentsWhen transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts inanti-static bags for safe transport.Lifting equipmentAdhere to the following guidelines when lifting heavy weight equipment:CAUTION: Do not lift greater than 50 pounds. Always obtain additional resources or use a mechanical lifting device.1. Get a firm balanced footing. Keep your feet apart for a stable base, and point your toes out.2. Tighten stomach muscles. Abdominal muscles support your spine when you lift, offsetting the force of the load.3. Lift with your legs, not your back.Working on your thin client 7