HP 8550 Service Manual - Page 334

Repair notices Note Make sure of the following when disassembling or assembling the printer. When the control panel soft switch (on the front of the copy module) is turned off, the fans continue to operate to cool the printer (to prevent clumping of toner). Be sure to perform the following before disconnecting the power plug: l Wait for 30 minutes after turning off the control panel power soft switch (to the right of the copy module control panel) or turning off the control panel soft switch and the copy module rear power switch (to the right side of the copy module rear), and then remove the fusing assembly of the printer unit. l Assemble the parts by reversing the steps used to disassemble them, unless otherwise instructed. l Identify the screws by type (length, diameter) and location. l Do not omit or forget to replace the toothed washer that comes with one of the mounting screws on the rear cover, as it protects against static electricity. l Do not omit or forget to replace the washer that comes with the screw used for the grounding wire and the varistor, as it ensures electrical continuity. l Do not operate the printer with any of its parts removed, unless otherwise instructed. l Use standard ESD precautions when disassembling the devices. All illustrations in this chapter assume that the copy module assembly is mounted on its stand. Remove the ADF when servicing the copy module. Service the copy module as it sits on the stand. Removal is not necessary. Pull the printer unit out of the stand when servicing, but do not remove it from its wheeled base. Remove the ADF and place it on a table when servicing to avoid personal injury or damage to the hardware. There are two unused connectors in the copy module. One is under the front panel, to the right of the scanner motor. The other is behind the rear panel, below the leakage breaker. 332 Chapter - 6 Removal and replacement EN