NoteActionxx2200001724Snap loose and remove the SMB unit.Put the unit in an ESD bag.5Disconnecting and removing the brake release unitNoteActionDANGERMake sure that all supplies for electrical power, hy-draulic pressure, and air pressure are turned off.1ELECTROSTATIC DISCHARGE (ESD)The unit is sensitive to ESD. Before handling the unitread the safety information in section The unit issensitive to ESD on page 50.2Disconnect the connectors R2.BU1 and R2.BU2 fromthe brake release board.3xx2200001728Remove the brake release unit by removing thescrews.Put the unit in an ESD bag.4Refitting the brake release unitUse this procedure to refit the brake release unit.Refitting the brake release unitNoteActionELECTROSTATIC DISCHARGE (ESD)The unit is sensitive to ESD. Before handling the unitread the safety information in section The unit issensitive to ESD on page 50.1Continues on next pageProduct manual - IRB 6740 3553HAC085701-001 Revision: A© Copyright 2023 ABB. All rights reserved.5 Repair5.7.3 Replacing the brake release unitContinued