HP LaserJet Pro 400 Service Manual - Page 29
Electrostatic discharge, Required tools, CAUTION,
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TIP: For clarity, some photos in this chapter show components removed that would not be removed to service the product. If necessary, remove the components listed at the beginning of a procedure before proceeding to service the product. Electrostatic discharge CAUTION: Some parts are sensitive to electrostatic discharge (ESD). Look for the ESD reminder when removing product parts. Always perform service work at an ESD-protected workstation or mat, or use an ESD strap. If an ESD workstation, mat, or strap is not available, ground yourself by touching the sheet-metal chassis before touching an ESD-sensitive part. Protect the ESD-sensitive parts by placing them in ESD pouches when they are out of the product. Required tools ● Number 2 Phillips screwdriver with a magnetic tip and a 152-mm (6-inch) shaft length ● Precision slotted screwdriver with a 1 mm (0.04 in) blade width NOTE: This fine-point tool is required to release the front door pins. The width of the blade must be 2 mm (0.08 in) or less to be able to drive the door pins out of the mounting holes. ● Small, slotted screwdriver ● Needle-nose pliers ● Snap-ring pliers ● ESD mat (if one is available) ● Penlight (optional) CAUTION: Always use a Phillips screwdriver (callout 1). Do not use a pozidrive screwdriver (callout 2) or any motorized screwdriver. These can damage screws or screw threads. Figure 1-1 Phillips and pozidrive screwdriver comparison ENWW Removal and replacement strategy 3