Acer TravelMate 4220 TravelMate 4520/4220, Extensa 4420/4120 Service Guide - Page 37

Chapter 3 System Disassembly This chapter provides step-by-step instructions on how to disassemble the notebook computer for maintenance and troubleshooting purposes. Disassembly Tools In performing the disassembly process, you will need the following tools: T Wrist-grounding strap and conductive mat for preventing electrostatic discharge T Philips screwdriver T Flat screwdriver T Hex screwdriver T Flat plastic screwdriver T Plastic tweezers Stages of the Disassembly Process The disassembly process is divided into three stages: 1. External modules disassembly 2. Main unit disassembly a. Upper case disassembly b. Lower case disassembly 3. LDC module disassembly IMPORTANT: The disassembly procedure described in this chapter is a gradual process, as illustrated in the flowcharts preceding each disassembly stage section. This means that users need to observe the instructions in a step-by step manner. To illustrate, removing the HDD assembly will require that you first remove the battery pack and the stylus. Failure to observe the gradual flow of the process may result in component damage. NOTE: To reinstall the system components and assemble the unit, perform the disassembly procedures in reverse. Equivalent Torque Values Torque values indicated in this chapter are expressed in kgf-cm (kilogram force-centimetre). For equivalent values in in-lb (inch-pound force) and Nmm (milli Newton meter), refer to the table below. Torque Units Torque values kgf-cm 1.6 3 4 in-lb 1.39 2.60 3.47 Nmm 156.91 294.21 392.28 Chapter 3 27